Behavior In Case Of A Communication Interruption: Watchdog - Beckhoff EP4378-1022 Manual

Commissioning and configuration
5.3.3

Behavior in case of a communication interruption: Watchdog

If the communication between the PLC and the analog outputs is interrupted, the analog outputs no longer
receive any preset values.
Watchdogs monitor the communication and can take over control of the analog outputs if the communication
is interrupted.
There are two Watchdogs:
• The "SM Watchdog" monitors the EtherCAT communication.
• The "PDI Watchdog" monitors the communication inside the module.
Both Watchdogs are disabled in the factory setting.
5.3.3.1 Enabling Watchdog
Actuators may start to move unexpectedly if a Watchdog is active
Injuries are possible.
1. Click the IO module EP4378-1022 under the entry "I/O" in the Solution Explorer.
2. Select the "EtherCAT" tab.
3. Click the "Advanced Settings" button.
4. Click the menu item "Behaviour"
5. Check the checkbox next to "Set PDI Watchdog" and/or "Set SM Watchdog".
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CAUTION
Version: 1.4 EP4378-1022