SATEC PM180 Operation Manual - Manual (Page 27)

‎Chapter 2 Device Description Device Diagnostics
PM180 Substation Automation Unit 25
NOTE
The IRIG-B time faults may not be masked and may not be cleared externally. If the
IRIG-B time code signal is not provided, set the device time synchronization input to
any unused digital input (see
Local Settings in Chapter 7) to avoid fault alarms
caused by the IRIG-B port.