Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 259)

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MELSEC-Q

10 TROUBLESHOOTING

information

The following shows examples of a program that reads error codes when

errors described in (1) above occur in an interface on the CH1 side and

initializes the displayed LED and communication error information.

Incorporate the necessary part of the program.

(Input/output signals X/Y00 to X/Y1F of the Q series C24)

1) When data is communicated using the MC protocol

Turn off/clear

command

Reads LED and communication error

information from address 201

Reads switch setting error description from address 203

Reads data transmission/reception

results from address 256

to 258

Requests initialization of error information on the

CH1 side and clearing of error codes in the buffer memory.

Requests initialization of error information on the CH1

side and clearing of error codes in the buffer memory.

Check the error codes and take corrective action according to Section 10.2.

2) When data is communicated using the non procedure or bidirectional

protocol

Reads LED and communication error information from

address 201

Reads switch setting error description from address 203

Reads data transmission/reception results from address

257

to 258

Writes initialization request such as for displayed LED to

address 0

Requests initialization of error information on the CH1

side and clearing of error codes in the buffer memory.

Turn off/clear

command

Check the error codes and take corrective action according to Section 10.2.

REMARK

When data is communicated using the MC protocol, the displayed ERR. LED may

not be turned on if the Q series C24 sends an NAK message to the external device

in response to the command message.

Error codes (see Section 10.2) corresponding to the error content when the NAK

message is sent back to the external device are stored in the following areas. (when

communicating with an A compatible 1C frame, the error codes differ from the

transmission error code.)

When checking error codes transmitted by the PLC CPU, incorporate the following

program (in case of the interface on the CH1 side).

Read command

Reads transmission error codes from address 25A

Clears error codes.

Check the error codes and take corrective action according to Section 10.2.

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 259

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 259

Commentaires sur ces manuels

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