Error Handling - Siemens Milltronics BW500 Operating Lnstructions

Error Handling

Modbus Responses
When polled by a Modbus Master, a slave device will do one of the following:
1. Not reply
means something went wrong with the transmission of the message
2. Echo back the command with the correct response
is the normal response, (see the Modbus specifications for more details)
3. Return an Exception Code
reflects an error in the message
BW500 and BW500/L uses the following exception codes:
Code
01 Illegal Function
02 Illegal Data Address
03 Illegal Data Value
04 Slave Device Failure
05 Acknowledge
06 Slave Device Busy
08 Memory Parity Error
7ML19985DK05Milltronics BW500 and BW500/L - OPERATING INSTRUCTIONS
Name
The function code received in the query is not an
allowable action for the slave.
The data address received in the query is not an
allowable address for the slave.
A value contained in the query data filed is not an allow-
able value of the slave.
An unrecoverable error occurred while the slave was
attempting to perform the requested action.
The slave has accepted a request and is processing it,
but a long duration of time is required.
The slave is processing a long-duration program com-
mand.
The slave attempted to read extended memory, but
detected a parity error in the memory. Service may be
required on the slave.
Meaning
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