4-2 Function Mode PID FB Status Output When the PID function is used, this function outputs a signal according to the FB value, as illustrated below. This is effective as a RUN command in operating multiple pumps. 4 PID FB Upper limiter (C052) PID FB value Functions PID FB Lower limiter (C053) FW FBV OFF at output frequency = 0 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 set in C077. 4-58 Data Symbol Function name Status Description 07 FBV PID FB status output ON See the figure below.
Shifts output when exceeding the upper limit or falling below the lower limit. OFF Available input terminals P1-PC, P2-PC, MA-MC (or MB-MC) Required settings C021, C026, C052, C053 ON OFF ON ON Data Symbol Function name Status Description 08 NDc Network error ON The communication watchdog timer times out. OFF Normal Available input terminals P1-PC, P2-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