Modbus TCP
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10.12 Error Behavior (Watchdog)
10.12.1 Behavior of Outputs
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 54):
Watchdog = 0 ms (default)
outputs hold the momentary value in case of an error
Watchdog > 0 ms
outputs switch to
0 after the watchdog time has expired (setting in register 0×1120).
10.12.2 Behavior of the BUS LED
If the Watchdog has tripped, the BUS LED behaves as follows:
10.13 Parameters and Diagnostic Messages of the I/O Channels
NOTE
Setting the outputs to predefined substitute values is not possible in Modbus TCP. Even-
tually parameterized substitute values will not be used.
Watchdog BUS-LED
tripped constantly red
NOTE
Please find explanations regarding parameters and diagnostic messages in the section
Register Mapping of the TBEN-L Devices, page 57.
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