Prosoft-technology MVI71-MCM Manual do Utilizador descarregar pdf (Página 94)

MVI71-MCM ♦ PLC Platform Reference

Modbus Communication Module

Page 94 of 111 ProSoft Technology, Inc.

December 28, 2007

5.6.6 Command Control

7800 Command Code

Enter one of the valid control command codes in

this register to control the module (9997, 9998, or

9999). Refer to MVI71-MCM Command Error Codes

(page 94) for more information.

7801 Command Data Not Used

- - -

7999 Command Data Not Used

5.7 MVI71-MCM Command Error Codes

The following tables list the MVI71-MCM Command Error Codes:

5.7.1 Standard Modbus Protocol Errors

Code Description

1 Illegal Function

2 Illegal Data Address

3 Illegal Data Value

4 Failure in Associated Device

5 Acknowledge

6 Busy, Rejected Message

5.7.2 Module Communication Error Codes

Code Description

-1 CTS modem control line not set before transmit

-2 Timeout while transmitting message

-11 Timeout waiting for response after request

253 Incorrect slave address in response

254 Incorrect function code in response

255 Invalid CRC/LRC value in response

5.7.3 Command List Entry Errors

Code Description

-41 Invalid enable code

-42 Internal address > maximum address

-43 Invalid node address (< 0 or > 255)

-44 Count parameter set to 0

-45 Invalid function code

-46 Invalid swap code

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 110 111

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Prosoft-technology MVI71-MCM Manual do Utilizador Página 94