Implementation of Modbus TCP
D301271 1013 - FGEN - multi protocol9-20
9.5 Error behavior of outputs (watchdog)
In case of a failure of the Modbus communication, the outputs’ behavior is as follows, depending on the
defined time for the Watchdog (register 0x1120, page 9-7):
watchdog = 0 ms (default)
→ outputs hold the momentary value
watchdog > 0 ms
→ outputs switch to 0 after the watchdog time has expired (setting in register 0×1120) .
Note
Setting the outputs to predefined substitute values is not possible in Modbus TCP. Eventually
parameterized substitute values will not be used.
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