JP2001282321A - Relay module equipped with signal state confirming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a relay module capable of easily operating the real wiring of relays in a hard wired system, and transmitting the operating states of the relays to a PLC without increasing the number of relays. SOLUTION: Contact relays CR5-CR11 are housed in a case body, and signal state confirming devices 45a-45g for detecting the ON/OFF states of the contact relays CR5-CR11 are connected in parallel to the contact relays CR5-CR11. Then, the case body is provided with a connecting terminal 47 capable of connecting the contact relays CR5-CR11 to each other and an external device, and the real wiring of sequence circuits is operated by using the connecting terminal 47, and the signal of the signal state confirming device 45 is outputted through an addressing circuit 46 to a PLC 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact relay having mechanical contacts, and more particularly to a contact relay used in a hard-wired sequence circuit which can be connected to a programmable logic controller (PLC). Related to relay unit.

[0002]

2. Description of the Related Art Generally, a sequence controller is used as a control device for a device to be controlled such as an industrial machine or a machine tool. This sequence controller has 2
One is a soft-wired programmable logic controller (PLC) that makes a computer have functions such as contacts and relays and creates a sequence circuit on a program. It has become mainstream from such points.

The other is a hard-wired type in which a sequence circuit is manufactured by combining a contact relay having mechanical contacts or a non-contact relay formed by a semiconductor element, which may cause a malfunction of a PLC CPU. In a place where strong noise is generated or in a circuit requiring high reliability, a hard-wired method using a contact relay is adopted, and a device to be controlled is controlled by combining these PLCs and a sequence circuit of a hardware method. ing.

The hardware type sequence circuit includes, for example, an emergency stop device for stopping the operation of the control target device. FIG. 6 shows a sequence circuit of the emergency stop device. The sequence circuit of the emergency stop device 1 shown in FIG.
Of the safety plug 12 and the operation preparation switch 13, an operation stop relay CR1 for stopping the operation of the controlled device 20 is provided.
, A normally-closed emergency stop switch 11 is connected in series with the control target device 20 similarly to the operation stop relay CR1.
A normally-closed safety plug 12 is connected in series to the operation stop relay CR2 for stopping the operation.

A normally open type operation preparation switch 13 is connected in series to the coil of the operation relay CR3, and the operation relay
CR3 and A contact CR of operation stop relay CR1 and CR2
3-1 and CR2-1 and CR1-1 are connected in series to the coil of the operation relay CR4, and further connected to the operation relay CR3.
A contact CR3-1 of the operation relay CR4 and the A contact CR4-1 of the operation relay CR4 are connected in parallel to form a self-holding circuit of the operation relay CR4.

Also, signals from limit switches LS1 and LS2 attached to a movable part (not shown) of the controlled device 20 are taken in as A contacts LS1-1 and LS2-1, and these A contacts LS1-1 and LS2-1 are used. External condition relay CR as input condition
6 and CR7, these external condition relays CR6,
The power-off relay CR5 is used with the A-contacts CR6-1 and CR7-1 of the CR7 and the A-contact CR4-2 of the operation relay CR4 as input conditions.
Is connected. And this power cut-off relay CR5
Is excited, the magnet switch CR5-1 on the supply line that supplies power to the controlled device 20 is activated, and power is supplied to the controlled device 20.

In addition to the above-mentioned sequence circuit, an operating voltage 5 different from the operating voltage 24 V of the sequence circuit
When the PLC operating at V is connected to the limit switches LS1 and L
To make it possible to check the state of S2, an external condition relay CR
6, operation confirmation relays X01 and X02 are provided using the A contacts CR6-2 and CR7-2 of CR7 as input conditions.

Conventionally, when the above-described sequence circuit is manufactured, the operation stop relays CR1 and CR2, the operation relays CR3 and CR4, and the contacts which are input conditions of these relays are sequence circuits essential for an emergency stop device. Therefore, it is modularized (indicated by reference numeral 2 as an emergency stop module in FIG. 6). The sequence circuits other than the emergency stop module 2, that is, the external condition relays CR6 and CR7 and the operation confirmation relays X01 and X related to the limit switches LS1 and LS2 of the controlled device.
02 and the power cut-off relay CR5, and the contact, which is the input condition of these relays, are connected to the emergency stop module 2 as external elements because the circuit configuration is changed each time the control target device is changed.

[0009]

As described above, the sequence circuit of the conventional emergency stop device includes the modularized emergency stop module 2 and the emergency stop module 2.
Limit switches LS1, L of the control target device 20 other than
External condition relays CR6 and CR7 relating to S2, operation confirmation relays X01 and X02, and power-off relay CR5;
These relays CR6, CR7, X01, X02, CR5
Are externally connected.

When a relay or the like is externally connected to the emergency stop module 2, a necessary number of relays are prepared and arranged in the control box, and wiring is connected for each relay. For this reason, there has been a problem that wiring of the relay and the PLC connected to the emergency stop module becomes complicated.

The number of input signal points of the relay externally connected to the emergency stop module changes for each controlled device. For this reason, the arrangement and occupation area in the control box greatly change for each control target device, and it is necessary to rearrange the devices in the control box for each control target device.

Further, when the PLC checks the operation of a limit switch and a relay constituted by hardware of a device to be controlled, or checks the operation of a relay externally connected to the emergency stop module, Due to the difference in operating voltage in the hard-wired sequence circuit, a relay or the like that constitutes the sequence circuit for mediating them is required separately, and the number of relays in the control box has been increased.

[0013]

In order to solve the above-mentioned problems, the present invention comprises a plurality of contact relays in a housing and a signal state checking device for detecting a signal on a wiring connected to the relays. A connection terminal connectable to the contact relays and an external device is provided in the housing. According to this configuration, the contact relays can be connected to each other or to an external device through the connection terminal, so that the wiring in the control box can be arranged and the wiring operation can be facilitated.

Further, since the number of relays can be managed in module units, the arrangement of the relays in the control box becomes easy.
Furthermore, by connecting a signal state check device to the contact relay in parallel so that the PLC can detect the state of the contact relay, the number of contact relays required in the sequence circuit can be reduced. Modules can be miniaturized. Also, by separating the emergency stop device into an emergency stop module containing a general-purpose sequence circuit and a relay module and housing them in the housing, it is sufficient to prepare and arrange a number of relay modules according to the device to be controlled. In addition, if the emergency stop module and the relay module are made to have the same appearance, the arrangement in the control box is further facilitated.

[0015]

Next, an embodiment of the present invention will be described. FIG. 1 shows an industrial machine used for a production facility,
It is a block diagram of a control system which constitutes a machine tool. In FIG. 1, reference numeral 20 denotes a device to be controlled, for example, a machine tool or a robot.

The controlled device 20 includes output elements such as a motor and a solenoid valve (not shown) and limit switches LS1 and LS1 for detecting the movement of a movable portion operated by these output elements.
An input element such as S2 is attached. These input elements and output elements are connected to a programmable logic controller (hereinafter, referred to as PLC) 32.

The PLC 32 inputs the state of the input element as an input signal, and outputs a predetermined output signal to the output element when the input signal of the input element reaches a predetermined state. Control. This PLC 32
The CUP 33, the ROM 34, and the RAM 35 are main components, and the RAM 35 stores an operation relationship between input elements and output elements as an operation sequence program.

The ROM 34 stores system software (OS) necessary for executing the sequence program, and the CPU 33 executes the sequence program stored in the RAM 33. The operation panel 10 and the emergency stop device 36 are connected to the PLC 32. Operation panel 10 is P
A start command and a stop command are given to the LC 32 and a CNC device (not shown), and the operation status of the control target device 20 is displayed.

The operation panel 35 includes a liquid crystal (LCD) display panel 37.
And a touch switch panel laminated so as to cover the entire display screen of the display panel 37, and various hard switches 38 and various hard lamps 39 arranged around the display panel 37. The hard switches 38 include, for example, an operation switch 40, an operation preparation switch 13, an emergency stop switch 11, and a safety plug 12, and the lamps 35 include a power lamp, an automatic operation lamp, a general abnormality lamp, and the like. The switches 34 and the lamps 35 configured by the hard wired system are used for operation control of the entire system.

The emergency stop device 36 is a device for supplying and shutting off electric power required for driving the output element.
The power supply / interruption is performed based on the operation of the operation preparation switch 13, the emergency stop switch 11, and the safety plug 12 of 0. FIG. 2 shows a circuit configuration of the emergency stop device 36. The emergency stop device 36 includes an emergency stop module 36a and a relay module 36b, as shown in FIG. FIG. 3 shows a circuit diagram of the emergency stop module 36a, and FIG. 4 shows a circuit diagram of the relay module 36b.

The emergency stop module 36a is a modularized version of the general-purpose sequence circuit of the emergency stop device 36. The sequence circuit 4 includes relays and contacts.
1 and an addressing circuit 42 for adding an address signal of the PLC 32 to a signal from a signal state checking device 43a to 43e, which will be described later, and outputting it.

As shown in FIGS. 2 and 3, the sequence circuit 41 has a normally-closed emergency stop switch 11 connected in series to an operation stop relay CR1 for stopping the operation of the controlled device 20. The normally closed safety plug 12 is connected in series to the operation stop relay CR2 for stopping the operation of the control target device 20, similarly to the operation stop relay CR1.

A normally open type operation preparation switch 13 is connected in series to the coil of the operation relay CR3, and the operation stop relays CR1 and CR2 and the A contact CR of the operation relay CR3 are connected.
1-1, CR2-1, CR3-1 are connected in series and connected to the operation relay CR4, and the A contact of the operation relay CR3
The first contact A CR4-1 of the operation relay CR4 is connected in parallel to CR3-1 to form a self-holding circuit of the operation relay CR4.

Further, the operation relay CR4 is provided with a second A contact CR4-2, and the second A contact CR4-2 is connected to the relay module 36b via the connection terminal 44. Note that the operation stop relays CR1, CR2, the operation relays CR3, CR used in the sequence circuit 41 are used.
4 and the relay contacts CR1-1, CR2-1, CR3-1, CR4-
1, wiring between CR4-2 is created in advance on the printed circuit board by etching etc., and the operation stop relays CR1, CR
2. The operation relays CR3, CR4, the emergency stop switch 11, the safety plug 12, and the operation preparation switch 13 are connected via the connection terminal 44. The connection terminal 44 is connected to
As shown in FIG. 3, two rows are formed on the front surface of the housing 30, and the wiring is fixed by screws.

The signal state confirmation devices 43a to 43d
Operation stop relays CR1 and CR2 and operation relay CR
3. Connected in parallel to CR4, ON / OF on the wiring
It is composed of a level converter for converting the F voltage level and a photocoupler for the purpose of noise elimination.
An FF signal is output.

On the other hand, as shown in FIG. 5, the relay module 36b includes well-known contact relays CR5 to CR1 in a housing 48 having the same appearance as the emergency stop module 36a.
7 are arranged. These contact relays CR5 to C
R11 has two A contacts each. Both ends of the contact relay and the A contact are connected to the connection terminal 47. Note that the number of contact relays arranged in the housing 48 of the relay module 36b is not particularly limited to seven, and may be appropriately set according to the size of the housing 48 and the like. Similarly, the contacts operated by the contact relays CR5 to CR11 are not limited to two.
Further, the type of the contact may be either the A contact or the B contact, and may have both the A contact and the B contact.

The contact state relays CR5 to CR11 are connected in parallel with signal state confirmation devices 45a to 45g, and these signal state confirmation devices 45a to 45g are connected to the addressing circuit 4.
6 from the addressing circuit 46 to the PLC 32 via the connector 49 shown in FIG.

When forming a sequence circuit connected to the emergency stop module 36a shown in FIG. 2 in the relay module 36b as described above, as shown in FIG. 5, three of the eight contact relays are used. Contact relay C
Using R5, CR6, CR7, each contact relay CR
5, one of the connection terminals Y01, Y11 of CR6, CR7,
Y21 is grounded, the other connection terminals Y12 and Y22 of the contact relays CR6 and CR7 are connected to limit switches LS1 and LS2 of the controlled device 20, respectively, and one connection terminal Y02 of the contact relay CR5 is connected. It is connected to one connection terminal X21 of the A contact CR6-1 operated by the relay CR6.

Contact relays CR5, CR6, CR
7, one of the connection terminals X11 of the A contacts CR7-1 among the A contacts CR5-1, CR6-1, and CR7-1 operated is connected to the second A contact CR4- operated by the operation relay CR4 of the emergency stop module 36a. 2, the other connection terminal X14 of the A contact CR7-1 is connected to the other connection terminal X24 of the A contact CR6-1 operated by the contact relay CR6.
One connection terminal X01 of the A contact CR5-1 operated by the contact relay CR5 is connected to the power supply of the control target device 20, and the other connection terminal X04 is connected to the limit switch LS1,
Connect to the power supply line of LS2.

As described above, the emergency stop module 36b
The contact relays that are externally connected to the control box are housed in the housing, and the connection between these contact relays or external devices can be made via the connection terminals, so that the wiring in the control box can be arranged. , Wiring work can be facilitated. Further, a general-purpose sequence circuit of the emergency stop device 36 is housed in a housing as an emergency stop module 36a, and a plurality of contact relays externally connected to the emergency stop module 36a are used as a relay module 36b, and the emergency stop is the same as the module. Since the number of relays can be managed on a module basis by being housed in the housing having a shape, the arrangement of the relays in the control box becomes easy.

Further, by connecting a signal state checking device in parallel to the contact relay so that the PLC can detect the state of the contact relay, the number of contact relays required in the sequence circuit can be reduced. The relay could be made a small module. Further, in the above embodiment, the relay module 36b is used for connecting the external element of the emergency stop module 36a, but the present invention is not limited to this.
The relay module alone can be used for any hardwired sequence circuit for external connection of other dedicated modules.

[0032]

As described above, according to the present invention, a plurality of relays and a signal state checking device for detecting a signal of a wiring connected to the relays are housed in a housing, and the contact relays are mounted in the housing. And a connection terminal connectable to an external device. With this configuration,
Connections between relays or external devices can be made via connection terminals, so wiring in the control box can be organized,
Wiring work can be facilitated.

Also, since the number of relays can be managed on a module basis, the arrangement of the relays in the control box becomes easy.
Furthermore, by connecting a signal state check device to the relay in parallel so that the PLC can detect the state of the relay, the number of contact relays required in the sequence circuit can be reduced, and the relay can be reduced to a small module. It can be. In addition, by sharing the housing with other dedicated modules, the arrangement in the control box is further facilitated.

Also, by storing the emergency stop module and the relay module separately in the housing, it is sufficient to prepare and arrange the number of relay modules corresponding to the device to be controlled, and to arrange the equipment in the control box. Becomes easier.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control system constituting an industrial machine and a machine tool used in a production facility according to an embodiment of the present invention.

FIG. 2 is a sequence circuit diagram of the emergency stop device according to the embodiment of the present invention.

FIG. 3 is a schematic diagram of a sequence circuit of the emergency stop module.

FIG. 4 is a schematic diagram of a sequence circuit of the relay module.

FIG. 5 is an external view of an emergency stop module and a relay module.

FIG. 6 is a diagram illustrating an emergency stop device (sequence circuit) according to the related art.

[Explanation of symbols]

10 Operation Panel 11 Emergency Stop Switch 12 Safety Plug 13 Operation Preparation Switch 20 Controlled Device 32 Programmable Logic Controller (PLC) 36 Emergency Stop Device 36a Emergency Stop Module 36b Relay Module 42, 46 Addressing Circuits 43a to 43e, 45a to 45g Signal Status Confirmation device 44, 47 Connection terminal CR5 to CR11 Contact relay LS1, LS2 Limit switch

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H220 AA05 AA06 BB01 BB11 CC03 CC09 CX01 DD05 EE06 HH03 JJ12 JJ45 9A001 HH34 JJ49 KK32

Claims (3)

[Claims] 1. A hard-wired relay module manufactured by combining a contact relay and a non-contact relay, wherein a plurality of contact relays are detected in a housing and signals of wiring connected to the relays are detected. A relay module comprising a signal state checking device, wherein the signal state checking device is housed, and a connection terminal connectable to the contact relays and an external device is provided in the housing. 2. The relay module according to claim 1, wherein an outer shape of the housing has the same shape as a dedicated module containing another sequence circuit. . 3. The relay module according to claim 2, wherein said dedicated module is an emergency stop module comprising a sequence circuit for controlling on / off of a power supply of a control target device. Equipped relay module.