Noely,
In order to set the FP-RLY-420 outputs to go to zero in the event of communication loss, you first need to enable the Network Watchdog. In the FP-1000 Bank Configuration Window (My Systen>>Devices adn Interfaces>>FP @ Com X>>FP-1000 @X Bank), set the Current and Power-Up Watchdogs to Enable for Bank. Set the timeout period for both to your desired communication loss interval. Next select the FP-RLY-420 module and Enable the Network Watchdog configuration on the Device Configuration Tab. Then, switch to the Channel Configuration Tab, and enable the Watch Value with a Value of 0 on each channel. Apply the settings and the module will automatically turn off all outputs in event of communications failure.
In LabVIEW, if there is no response from the module, you will automatically receive an error message (Communication Timeout) from the FP Read/FP Write/FP Advise VIs.
Regards,
Aaron
LabVIEW Champion, CLA, CPI