Common man-machine interface and PLC communication failures, and solution is introduced Industrial control -

A WB236 * 2000 digital display four core for DVP - roller plate bending rolls control system Eh00r type PLC and DOP - 64 A57GSTD man-machine interface. In use process, fault alarm in man-machine interface. Now is the time the fault as an example, this paper introduces DVP - Eh00r type PLC and DOP - 64 Type A57GSTD man-machine communication interface.

a man-machine interface, fault information alarm message is:

check DOP series manual man-machine interface, CommunicaTIon Error 3 & hellip; 控制器NoResponse… Implications for the controller has no response. Look from the alarm information, the possibility of communication cable or poor contact communication port is great, and do not rule out the possibility of a hardware failure PLC, man-machine interface is.

2, PLC controller and man-machine interface rules introduced DVP - of communication 64 eh00r type PLC with RS485 and RS232 communication port of each one.

计划- Type A57GSTD man-machine interface has COM1, COM2, a total of two communication ports. COM1 communication mode with RS232 and RS485 and RS422 three. COM2 RS232 only a kind of communication mode. Three, maintenance:

A) For communication cable poor contact measures:

redone RS232 and RS485 communication cable replace each one, for communication RS232 and RS485 communication mode, to ensure that the communication cable in good contact. Communication cable wiring diagram is as follows:

2) In view of the communication port poor contact measures:

respectively using: PLC RS485 communication port with man-machine interface COM1 port in RS485 communication mode of communication; PLC communication port COM1 and man-machine interface COM1 port communication over RS232 communication mode; PLC COM2 communication port and the man-machine interface of COM1 port communication over RS232 communication mode. The measured through different communication port communication, determine the fault communication port.

1, using RS485 communication cable, PLC RS485 communication interface and human-computer interface COM2 interface to connect. Man-machine interface COM2 communication mode to RS485.

if the fault is still, the cause of the fault may be produced as: PLC RS485 interface has fault.

2, with RS232 communication cable, the RS232 communication interface of PLC and man-machine interface COM2 interface to connect. Man-machine interface COM2 communication mode to RS232.

if the fault is still, the cause of the fault may be produced as follows: man-machine interface COM2 interface failure.

( 3) The PLC controller with RS232 communication cable, RS232 communication interface and human-computer interface COM1 interface to connect. Man-machine interface COM1 is set to the RS232 communication mode.

if the fault is still, the cause of the fault may be produced as: PLC internal registers: D14, D34, D200 af must not be, M0 data errors, need to read PLC program for inspection.

4, troubleshoot according to the maintenance of train of thought, to make RS485 communication cable. With RS485 communication cable connect to PLC and HMI, fault disappear, equipment back to normal. So as to prove the fault reason is: the communication cable is poor contact, led to the incorrect, PLC and man-machine interface communication cause alarm interface.

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