Communication-capable Circuit Breakers

WL Circuit Breaker

Exception Codes

Code

Name

Meaning

01 hex

Illegal Function

The function code received in the query is not an allowable action for the COM16 slave. If a

 

 

Poll Program Complete command was issued, this code indicates that no program function

 

 

preceded it.

02 hex

Illegal Data Address

The data address received in the query is not an allowable address for the COM16 slave.

03 hex

Illegal Data Value

A value contained in the query data field is not an allowable value for the COM16 slave.

04 hex

Slave Device Failure

An unrecoverable error occurred while the COM16 slave was attempting to perform the

 

 

requested action.

05 hex

Acknowledge

The COM16 slave has accepted the request and is processing it, but a long duration of time

 

 

will be required to do so. This response is returned to prevent a timeout error from occurring

 

 

in the master. The master can next issue a Poll Program Complete message to determine if

 

 

processing is completed.

06 hex

Slave Device Busy

The COM16 slave is still busy processing the previous request. The master should re-transmit

 

 

the message later when the COM16 slave is free.

07 hex

Negative Acknowledge

This code is returned for an unsuccessful programming request using function code 13 or 14

 

 

decimal. The COM16 slave will never return this exception response since it does not support

 

 

function 13 or 14.

08 hex

Memory Parity Error

The COM16 slave attempted to read extended memory, but detected a parity error in the

 

 

memory. The master can retry the request, but service may be required on the COM16 slave

 

 

device.

Table 3-4

 

 

The following functions are not supported by the COM16. If a

COM16 slave receives a query for any of these functions, an

Exception Code of 01 (Illegal Function) will be the response.

Function 06: Write Single Register

Function 17: Report Slave ID

Function 20: Read General Reference

Function 21: Write General Reference

Function 22: Mask Write 4X Register

Function 23: Read/Write 4X Registers

Function 24: Read FIFO Queue

3/10

WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL 489, UL1066 specifications Exception Codes, Code Name Meaning

UL 489, UL1066 specifications

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