Siemens Milltronics BW500/L - Error Handling

Communications
11.7 Error Handling
BW500 and BW500/L
Operating Instructions, 12/2016, A5E33482052-AD
149
BW500 and BW500/L
● set P770, port 1, to the value 3 (Modbus RTU)
● set P771, port 1, to the value 1 (Network ID 1)
● set P772, port 1, to the value 3 (Baud rate of 9600)
● set P773, port 1, to the value 0 (No Parity)
● set P774, port 1, to the value 8 (8 Data Bits)
● set P775, port 1, to the value 1 (1 Stop Bit)
● set P778, port 1, to the value 1 (Communications through Modem)
● set P779, port 1, to the value 300 (Modem Inactivity of 300 seconds)
Note
Parameters are defined the in the Installation section
11.7
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