4-2 Function Mode Network Error This function detects and outputs a network error during RS485 ModBus communication. •The error is output during RS485 ModBus communication if the next signal does not come even after the specified time period in C077. 4 Functions 4-68 Data Symbol Function name Status Description 08 NDc Network error ON The communication watchdog timer times out. OFF Normal Available input terminals P1-PC, MA-MC (or MB-MC) Required settings C021, C026, C052, C077 Master Slave Time out Watchdog timer [C077] NDc Alarm [C076] = 00 or 01