EP1953648B1 - Control process on a cross-wound bobbin producing textile machine with components connected via a machine bus - Google Patents

Description

The invention relates to a method for avoiding address conflicts on a cross-wound textile machine having a plurality of similar jobs, which have a plurality of components, such as a thread tensioner or a paraffining device, a drive a thread laying device, a thread connecting device or the like, which is used to control the Manufacturing process are connected to a machine bus, the components and / or jobs each having an identification address is assigned.

A textile machine comprises a plurality of preferably modular workstations, which in turn have a plurality of components, such as drives for an opening roller, a thread laying device or the like and a thread cleaner or a thread cutting device. The modular structure of the workstations allows in a simple way the exchange of individual components within the workplace or the replacement of the same components between different workstations of the textile machine. Furthermore, the components of a workstation are understood as meaning, for example, the drives of a thread connecting device, a thread feeder device or a thread tensioner of a winding machine. Accordingly, for example, in drives for a Feed roller, a take-off roll or a spin agent to the components of the jobs of a spinning machine.

Such a textile machine is from the EP 0 385 530 A1 known. This has to control the operations at their jobs via a field bus system, which consists of a field bus and attached components of the jobs. The fieldbus is connected to a central controller to communicate with the components of the workstations via command sequences which are forwarded to individual workstation computers.

As components all individual components of the jobs of the textile machine are understood, which are controllable by a central control device. These include the jobs as well as the components within the workstations, which are interconnected by the fieldbus, including the workstation computers. For a targeted response of individual components and / or the jobs, it is necessary that each component and / or job is assigned a unique identification address. The identification addresses can be stored, for example, in a non-volatile memory of the component and / or the workstations or set via coding switch of the component.

If two components and / or jobs have an identical identification address, in normal operation both interpret an instruction sent to the fieldbus and provided with this identification address as directed to it. The result is that a targeted response of a single component and / or job no longer possible or, respectively, several components and / or workstations of the textile machine erroneously respond together to a command sequence sent to the fieldbus.

If only components of different types are provided in a fieldbus, the address assignment can be coupled to the type of the component. However, if several components or workplaces of the same type are present in the fieldbus, there is a high risk that the same identification address will be assigned to two components or workplaces of the same type. If such an error occurs and several components and / or workstations with the same identification address are present in the fieldbus, bus communication is disrupted (for example, misinterpretation of commands, command sequences reach the component which should not be addressed or commands are not executed at all) ), where it is difficult to identify which of the components and / or workplaces are responsible for the disturbance.

Thus, for example, a double allocation of the identification address for the drive components of the feed roller and drive the take-off roller of the work of the spinning machine would result in a command sequence to increase the drive speed of the feed roller to a certain value of this command is interpreted by the drive of the take-off roll in the manner in that it is operated at the same speed, which would be associated with corresponding negative consequences.

It is therefore expedient, as far as possible to prevent the risk of duplicate address assignment, even before entering normal operation.

The object of the invention is to avoid address conflicts in a fieldbus system of a textile machine, in particular without the requirement of a central instance managing the addresses of the components and / or workstations, as in US Pat EP 1 054 086 A is proposed.

This is achieved by a method according to claim 1 according to the invention. The method is used in a textile machine in which each component and / or workstation has a control device which sends a request message with its preset identification address via the machine bus during the installation of the component and / or the work before transition to normal operation which is suitable for causing a component and / or workstation already connected to the machine bus with an identical identification address to respond. The controller for examining bus communication on the machine bus is arranged to determine if a response message is being sent from an already connected component and / or workstation. The controller evaluates the bus communication to detect whether an already connected component and / or job is linked to the machine bus with identical identification address; the controller is adapted to automatically generate a new address when an address collision is detected in the evaluation to send a request message with the newly set identification address via the machine bus when has been determined that the originally set identification address is assigned.

The check according to the invention can be used both in ongoing fieldbus operation and during commissioning of the fieldbus.

The check preferably takes place at each new start of the textile machine or even only the workplace after a downtime. The check can also be triggered by a manual startup of the component and / or workstation, for example, after their replacement or as a consequence to the switching on of the power supply of the component and / or workstation.

In response to the initiation of the check, the controller of the component and / or the workstation determines its own preset identification address and sends a request message to the fieldbus configured to have another component and / or workstation having the same identification address in normal operation is caused to a response message. The controller of the component and / or workstation that sent the request message itself does not respond with a reply message but monitors the bus communication. The read messages on the fieldbus are checked to see if it is the reply message to the request message.

When such a response message is received, the controller of the component and / or workstation can recognize that its identification address in the fieldbus system already assigned elsewhere, and accordingly does not go with this identification address in the normal mode.

If the control device detects an already installed on the fieldbus component and / or job with the same identification address, the control device outputs an interference signal, which is displayed by a means on the textile machine. This can be an optical or acoustic interference signal or even a telegram to the workstation computer of the textile machine.

In addition, the controller automatically generates a new address to repeat the process of checking the identification address to connect the component and / or job to the field bus and to be able to convert into normal operation. For this purpose, the control device of the component and / or work place instead of a single identification address also a plurality of identification addresses or an identification address space assigned so that it starts the process with a first of these identification addresses and continues on receipt of a response message with further identification addresses until they has reached an identification address that has not yet been assigned in the fieldbus system. Alternatively, one or more random identification addresses can be generated on the basis of the evaluation of the bus communication. According to the independent claim 2 is responded to the triggered interference signal by qualified personnel such that directly at the component and / or the job, the identification address is manually adjusted, for example by means of coding elements such as dip switches or the like. Particularly advantageous are these embodiments, as with this changed identification address In turn, it is checked whether an already installed component and / or job with the same identification address in the fieldbus system is present.

It proves to be advantageous if, in the presence of an address conflict, the control device can set a limited number of new identification addresses in order to repeat the request. The number of addresses can be limited in a predeterminable manner in order to keep the process within a reasonable time frame.

Furthermore, means may be provided on the textile machine that indicate that an address has already been allocated. The means provided for signaling an address conflict are preferably attached directly to the component and / or job, so that in the course of commissioning the field bus, the identification of the incorrectly set component and / or job is easy. As an advantageous embodiment, an optical signal transmitter is considered, for example, a signal LED or a signal bulb or a speaker. The address collision can be displayed on the textile machine via a central control device and / or sent from the latter to a remote computer in order to give an indication of an address collision there.

In a further development of the invention, the control device transfers the component and / or workstation to normal operation if no already connected component and / or workstation with the same identification address has been recognized on the fieldbus. The absence of a response message ensures that an address conflict and a resulting disturbance of the bus communication is not to be feared are. As soon as the new component and / or work station has entered normal operation, it is ready to receive normal operating messages, which may also include request messages from other components and / or workstations connected to the fieldbus which, for the purpose of transition to normal operation, Check the presence of their identification address in the fieldbus system.

Particularly advantageous is an embodiment in which the control device of the component and / or the work station waits for activation and before sending the request message a waiting period having a randomly selected duration. This ensures that two control devices of components and / or jobs with identical identification address despite simultaneous activation or energization not simultaneously perform the check and then go to normal operation due to the absence of a response message.

In fieldbus systems that extend over a large area, alternatively or additionally, an acoustic interference signal emanating from the signal generator is advantageous, which permits location of the signaling component and / or workstation even in the absence of visual contact.

In a further development ends a detection period in which the bus communication is examined by the new component and / or job, at the latest when a predetermined maximum time has elapsed since sending the request message and / or at least one other message from an already installed component and / or job on the fieldbus whose priority is less than the priority of the expected response message.

The simplest variant provides for a limited detection period, after the expiry of which the first component and / or workstation goes into normal operation without the arrival of a response message. The detection period is preferably to be chosen so large that it is ensured that a possible already installed component and / or job with identical identification address has been enabled to send a response message to the fieldbus.

Alternatively or additionally, it can be used as a criterion whether, in the checking of the bus communication, other messages are determined whose priority is higher than the priority of the expected reply message. If so, the first component and / or job waits until no further message or low priority message has been detected on the fieldbus. This ensures that the response message does not just fail because it is overwritten in the course of an arbitration by higher-priority messages.

Fig. 1

schematisch in Seitenansicht eine Arbeitsstelle einer Kreuzspulen herstellenden Textilmaschine, im Ausführungsbeispiel eines Kreuzspulautomaten;

Fig. 2

eine schematische Ansicht eines Teils einer erfindungsgemäßen Textilmaschine mit mehreren Arbeitsstellen;

Fig. 3

eine schematische Ansicht einer Komponente;

Fig. 4

ein Ablaufdiagramm einer ersten Variante des erfindungsgemäßen Verfahrens zur Vermeidung eines Adresskonflikts; und

Fig. 5

ein Ablaufdiagramm einer zweiten Variante des erfindungsgemäßen Verfahrens zur Vermeidung eines Adresskonflikts.

In the drawings shows:

Fig. 1

schematically in side view a job of a cheese-producing textile machine, in the embodiment of a cheese winder;

Fig. 2

a schematic view of a portion of a textile machine according to the invention with several jobs;

Fig. 3

a schematic view of a component;

Fig. 4

a flowchart of a first variant of the inventive method for avoiding an address conflict; and

Fig. 5

a flowchart of a second variant of the inventive method for avoiding an address conflict.

In FIG. 1 is a side view schematically shows a job 20a of a cross-wound producing textile machine, in the present case of a so-called cross-winding machine 1 shown. Such spooling machines 1 have a plurality of similar, in series juxtaposed jobs 20a, 20b, 20c as in Fig. 2 shown, on which, as known and therefore not explained in detail, spinning cops 3, which have relatively few yarn volume, are rewound to large-volume cheeses 5.

The running thread 16 is also monitored during rewinding, as is known, for possible yarn defects, the be cleaned if necessary. In addition, the thread 16 is paraffinized during the rewinding process. That is, the thread 16 is passed through a paraffining device 19, which ensures that the coefficient of friction of the thread 16 is reduced.

The cheeses 5 are handed over after their completion by means of a (not shown) automatically operating service unit on a machine-spooled cross-bobbin transport device 7 and transported to a machine end side Spulenverladestation or the like.

As in Fig. 1 further indicated, such automatic packages 1 are often equipped with a bobbin and tube transport system 6, in which, on transport plates 11, the spinning cops 3 and the empty tubes circulate. Of such a bobbin and sleeve transport system 6 are in Fig. 1 only the Kopszuführstrecke 24, the reversibly drivable storage section 25, one of the leading to the winding unit 20a transverse transport sections 26 and the sleeve return path 27 shown.

The individual work stations 20a to 20c furthermore have various devices which ensure the proper operation of such workstations 20a to 20c. Such devices are known per se and therefore in the Fig. 1 only hinted.

One of these known devices is, for example, the winding device 4, which has a coil frame 8 movably mounted about a pivot axis 12.

According to the present embodiment, the cheese 5 is located during the winding process with its surface on a drive drum 9 and is driven by this single-motor actuated drive drum 9 via frictional engagement.

The corresponding, via a Arbeitsstellenfeldbus 57 to a workstation computer 22 connected drive carries the reference numeral 33th

For traversing the thread 16 during the winding process a Fadenchangiereinrichtung 10 is provided. Such, also known and in the FIG. 1 only schematically indicated Fadenchangiereinrichtung 10 has, for example, a yarn guide 13 with a finger-like thread laying lever.

The acted by an electromechanical drive 23 thread-laying lever traverses the thread 16 between the two end faces of the cheese 5. The drive 23 of the thread guide 13 is also connected via the Arbeitsstellenfeldbus 57 to the workstation computer 22.

As indicated above, the illustrated job 20a of such automatic package 1 in the yarn path a defined controllable thread tensioner and a thread cleaner 15, on which is functionally connected to a thread cutting device 18. The thread tensioner, the thread cleaner 15 and the thread cutting device 18 are also connected via the Arbeitsstellenfeldbus 57 to the workstation computer 22 to be controlled via this. Immediately before the thread-changing device 10, the workstation 20a also has a paraffining device 19 on, which makes it possible to provide the thread 16 during the Umspulprozesses with a paraffin order. The paraffining device 19 is likewise connected to the workstations computer 22 via the workstation field bus 57.

As in FIG. 1 indicated, the single drive 31 of the paraffining device 19 is connected via the Arbeitsstellenfeldbus 57 to the workstation computer 22.

Further detailed descriptions of workstations cheesemaking textile machines are for example the DE 199 05 860 A1 for a winder and the DE 44 04 503 A1 and the DE 101 39 075 A1 for a spinning machine.

In the FIG. 2 Textile machine 1 shown schematically has a central computer 59 which is connected to a machine field bus 14. In addition, the textile machine 1 has a DC power supply 60. In the textile machine 1, a plurality of jobs 20a to 20c are used, which are respectively connected to the engine field bus 14 and the DC power supply 60. The number of jobs 20a to 20c is not limited to the number shown, but almost unlimited expandable.

Within the workstations 20a to 20c, a workstation 22 and a transformer 28 are provided, each workstation 22 being connected to the machine field bus 14, and each transformer 28 being connected to the DC power supply 60. The transformer 28 serves to convert the voltage supplied by the DC power supply 60 to a voltage suitable for the operation and the control of the jobs 20a to 20c is required.

In addition, each work 20a to 20c, as already described for the cheese winder 1, on facilities, drives and the like, simplifying the following explanation of the method in FIG. 2 are shown and designated schematically as components 26a to 26e, which can be controlled via the working field bus 57 or the machine field bus 14. The number of components 26a to 26e, which correspond to the already described drives or devices of cheesemaking textile machines, can be extended almost arbitrarily. These components 26a to 26e, in the case of a package winding machine, as already mentioned, may include drives for a thread connecting device including cutting and clamping devices for the thread ends, thread feeders such as a gripper tube for the yarn supplied by the cop and a suction nozzle for that of the cross-wound bobbin zurückgeholten thread, a thread tensioner, Kopswechseleinrichtung or the drive 31 of the paraffining device 19 or the drive 23 which controls the laying of the thread along the cheese 5, as in FIG. 1 shown. Other components 26a-26e may also be connected to the workstation computer 22, such as valves that control the pressure in suction tubes or splice channels, or the thread trimmer 18 and sensors of various types, such as the thread scrubber 15 or a yarn tension sensor.

In the case of a spinning machine, it may be in the components 26 a to 26 e to drives the feed rollers for the sliver feed, take-off rollers for the spun yarn, drives for the Spinning, a suction nozzle for the retrieved from the cheese package thread, a paraffining device and for laying the thread along the cheese act. Again, valves, for example, for compressed air supply to prepare the yarn ends for piecing or sensors one of the components 26a to 26e form.

The components 26a to 26e are each connected to the workstation field bus 57 to which the workstation computer 22 is also connected. Accordingly, the textile machine 1 has a workstation field bus 57 via a machine field bus 14 as well as each workstation 20a to 20c.

This hierarchical structure, in which the workstation 22 of each workstation 20a to 20c serves as an intelligent converter and control device for the components 26a to 26e, permits a particularly flexible adaptation of the workstations 20a to 20c.

In order to be able to communicate with the individual components 26a to 26e via the engine fieldbus 14 or the workstation field bus 57 by the central computer 59 or the workstation computer 22, each component 26a to 26e is assigned an identification address corresponding to each component 26a to 26e of each workstation 20a to 20c is unambiguous, wherein the individual jobs 20a to 20c is also assigned a unique identification address. The identification addresses are at the components 26a to 26e and / or the jobs 20a to 20c prior to their installation or prior to their commissioning after their connection to the machine field bus 14 or the respective working field bus 57th can be preset, for example, by a coding element, such as a dip switch or the like, or by a direct input of an identification address into a nonvolatile memory of the workstations 20a to 20c or the components 26a to 26e by means of an input device connectable to it or by automatic generation of an identification address by means of a software algorithm.

The communication of the central computer 59, for example, with the component 26c of the job 20b via the machine field bus 14 by sending a command to the identification address of this job 20b and / or the component 26c corresponding identification address. The communication within the workstations 20a to 20c takes place in a corresponding manner via the workstation fieldbus 23, in that the individual components 26a to 26e are addressed here on the basis of their individual identification address. Thereafter, the specific command sequences for this purpose can be sent to the identification address of the relevant components 26a to 26e and converted via a printed circuit board of the components 26a to 26e.

When reinstalling or replacing one or more of the components 26a to 26e and / or the entire workstation 20a to 20c, recognition of the identification address of the exchanged components 26a to 26e or the workstation 20a to 20c is required. Since the setting of the identification address before installation or before commissioning, it is necessary to check whether the default address already on one of the field buses 14, 57 for a component 26a to 26e or a Job 20a is assigned to 20c, which is used by the central computer 59 or the workstation computer 22 for direct communication. Double assignment of an identification address causes a command sequence of various components 26a to 26e or jobs 20a to 20c to be received and implemented, which may result in errors in the operation of the textile machine 1.

FIG. 3 shows a newly installed component 26a connected to the workstation field bus 57. The component 26a has a control device with a main processor 51, a data memory 53 connected to the main processor 51, a transmitting and receiving device 55 connected to the main processor 51, and a signal generator 17 which generates an optical and / or acoustic signal.

Via a power supply line 56, the components 51, 53, 55, 17 of the component 26 a are supplied with power. The data memory 53 is designed as a nonvolatile data memory 53. In it, a computer program is stored, which is the initialization of the component 26a after switching on the power supply. When power is supplied to the component 26a, the main processor 51 starts to execute this program. The functioning of the computer program is based on two variants, shown in the FIGS. 4 and 5 , explained below.

The FIG. 4 shows a first variant for avoiding an address conflict on the textile machine 1. This method is stored in the form of a computer program in the nonvolatile data memory 53 of the component 26a and is performed after the supply of the installed component 26a with power. After this Start 30, the main processor 51 generates a random number and waits in a first step 32 for a random number corresponding period.

At the end of this time period, in a subsequent method step 34, a request message is sent to the workstation field bus 57, which is suitable for sending another component 26b to 26e, which is connected to the workstation field bus 57 and in an operating state, to an answering station. Message. In the simplest case, this can be a so-called echo message, which is understood by the receiver specified in the echo message via an identification address as sending a reply message in order to recognize its readiness to receive. Its own identification address is read by the main processor 51 from the data memory 53 for this purpose.

After sending the request message, the control device component 26a goes into a monitoring mode in method step 36 in which it monitors only the communication running on the workstation field bus 57. After reading the bus communication, it assesses in a first decision step 37 whether a message has been received. If so, in a second decision step 38, it judges if this is a response message in response to its request message. If this is not the case or if it was determined in the first decision step 37 that no bus communication has taken place, it checks in a subsequent third decision step 40 whether a predefined maximum time for the passive check of the bus communication has expired. If this is not the case, component 26a returns to step 36 and further evaluates bus communication.

If it recognizes in the second decision step 38 that a response message has been received on its request message, it proceeds to step 42, in which it terminates the initialization process with an optical and / or acoustic interference signal in the form of activation of the signal generator 17. Alternatively, it could also send a corresponding telegram to the workstations computer 22. On the other hand, if it recognizes in the third decision step 40 that the verification time has elapsed without a response message having been received on its request message, then the control device causes the component 26a to go into normal operation in method step 44.

By waiting for a random time in method step 32 it is achieved that two components that are supplied with power at the same time and that have the same identification address do not simultaneously send their respective request message, since according to the invention both do not respond to this request message that at the same time sending the request message, both components would erroneously come to the result that there is no address conflict.

FIG. 5 shows the flowchart of a second variant. Process steps that correspond to the process steps of FIG. 4 Correspond to the first variant shown are referenced with identical reference numerals.

The second variant differs in that in the data memory 53 of the control device of the component 26 a in addition to the computer program for carrying out the method, instead of the own identification address, an address range is predefined, which has a large number of possible identification addresses for the component 26a.

Subsequent to the start 30 of the method, in this second variant, in a first method step 50, a first identification address is selected from this address space. In method step 34, a request message marked with this first selected identification address is sent to the workstation field bus 57. If, in method step 36, a response message has been received on workstation field bus 57 for this specific first identification address and, accordingly, the selected identification address has already been assigned, a fourth decision step 52 determines whether there are still further identification addresses available in the address space. If this is the case, in a method step 54, a new identification address for the component 26a is selected from the address space and a new request message with this changed identification address is sent to the workstation field bus 57. Only when all identification addresses in the address space have each been the subject of a request message and a response message has been received for all identification addresses, a jamming signal is output in a method step 42.

The execution of the check can be carried out in the same way also at the level of the engine field bus 14. Again, to avoid an address conflict procedure accordingly.

Claims (6)

1. Method for avoiding address collisions in a textile machine (1) producing cross-wound bobbins comprising a plurality of similar workstations (20a, 20b, 20c), which have a plurality of components (26b, 26c, 26d, 26e), such as, for example, a thread tensioner or a waxing device (19), a drive (23) of a thread displacement device (10), a thread connecting device or the like, which are connected to a machine bus (14, 23) for controlling the production process, wherein the components (26b, 26c, 26d, 26e) and/or workstations (20a, 20b, 20c) are each allocated an identification address,
   characterised in that

   - each component (26a, 26b, 26c, 26d, 26e) and/or workstation (20a, 20b, 20c) has a control device, which during the installation of the component (26a, 26b, 26c, 26d, 26e) and/or the workstation (20a, 20b, 20c), before a transfer to normal operation, sends an inquiry message with its pre-set identification address via the machine bus (14, 23), which is suitable to prompt a component (26b, 26c, 26d, 26e) already connected to the machine bus (14, 23) and/or workstation (20a, 20b, 20c) with an identical identification address into a response,

   - in that the control device for investigating a bus communication on the machine bus (14, 23) is set up to establish whether a response message from an already connected component (26b, 26c, 26d, 26e) and/or workstation (20b, 20c) is sent,

   - in that the control device evaluates the bus communication to recognise whether an already connected component (26b, 26c, 26d, 26e) and/or workstation (20b, 20c) with an identical identification address is connected to the machine bus (14, 23), and

   - in that an error signal is generated, if it is established that the originally set identification address has been allocated.
2. Method according to claim 1, characterised in that by means of the control device on the basis of the error signal a new identification address is generated automatically and an inquiry message with the newly adjusted identification address is sent via the machine bus (14, 23).
3. Method according to claim 1, characterised in that on the basis of the display of the error signal an alternative identification address is adjusted manually on the component (26a) and/or the workstation (20a) by means of coding elements.
4. Method according to claim 2, characterised in that the control device sets a limited number of new identification addresses when there is an address collision to repeat the inquiry.
5. Method according to any one of claims 1 to 4, characterised in that the control device transfers the component (26a) and/or the workstation (20a) into normal operation, if no already connected component (26b, 26c, 26d, 26e) and/or workstation (20b, 20c) with the same identification address is recognised at the field bus (14, 23).
6. Method according to any one of claims 1 to 5, characterised in that a detection period can be input into the control device, in which the bus communication by the new component (26a) and/or the workstation (20a) is investigated, and which at the latest ends if an input maximum time from sending the inquiry message has expired.

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