PLC / Modbus/RTU
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6.3 Watchdog
The Modbus telegram watchdog monitors the connection between the master wireless
module and the controller. It is triggered each time a Modbus telegram is received correctly.
You can activate the watchdog using the PSI-CONF software.
• Under “Individual Settings”, select the “Network Settings” item. You can set a watchdog
time of 200 ms ... 65000 ms here.
.
Figure 6-7 PSI-CONF software: “Individual Settings, Network Settings”
If the watchdog is triggered, an action will be performed on the I/O output modules. You can
set this behavior in the event of an error using the DIP switches on the front.
– OFF = RESET: output value is set to 0
– ON = HOLD: hold the last output value
For more information on setting the DIP switches for the different extension modules, please
refer to Section “Description of I/O extension modules” on page 87.
If the watchdog is activated and Modbus communication interrupted, the red ERR LED will
flash on all wireless modules in the network. Depending on the DIP switch settings, the out-
put modules issue the corresponding hold or reset value.
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