Communication
2.4 Modbus TCP to Modbus RTU Gateway
93SICAM Q100, 7KG95xx, System Manual
E50417-C1040-C522-A8, Edition 09.2020
Parameterization of the Modbus Gateway
You can find detailed information on parameterizing the Modbus gateway in the SICAM Q100 device manual,
Communication chapter 8.
Diagnosing the Modbus Gateway
You can find detailed information on diagnosing the Modbus gateway in chapter 2.3.2.
Exception Responses from the Modbus Gateway
If a request from the Modbus gateway cannot be forwarded to the associated Modbus slave device or the Mod-
bus slave device does not respond, the Modbus gateway sends Modbus exception codes in exception respons-
es messages to the Modbus TCP client.
The messages contain the following codes:
• Exception code 10 GATEWAY_PATH_UNAVAILABLE
The gateway function was activated in the SICAM Q100 at the Ethernet interface settings, but Modbus
RTU master was not selected as serial protocol.
• Exception code 11 GATEWAY_TARGET_DEVICE_FAILED_TO_RESPOND
No response from the Modbus slave device to which the request message was sent according to the unit
ID (observing the parameterized response time-out and message repetitions).
NOTE
The Modbus RTU master and the Modbus gateway function can be operated in parallel.
NOTE
During a firmware update of the SICAM Q100, the Modbus gateway function is stopped.
SYS_SICAM_Q100_US.book Page 93 Thursday, September 24, 2020 1:17 PM
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