— Lost Communication”, places it in MCM.CMD.Log, and increments MCM.CMD.Log_Quantity. If the same line later appears in MCM.STS.Acknowledge_Log, the routine latches Acknowledge and clears the entry so the log stays current. The command bit MCM.STS.Unacknowledge_All_Logs resets the Acknowledge latch, guaranteeing that the next loss of communication will produce a fresh message. Command bits The routine receives Communication_Fault from its own port monitor. The routine receives EN4TR_Communication_Fault from the rack adapter. The routine receives MCM.STS.Unacknowledge_All_Logs to clear the acknowledge latch. Status bits The routine sets Communication_Faulted when either link is down. The routine sets CTRL.STS.Communication_Faulted with the same value. HMI bits The HMI displays HMI.STATE as 0 for healthy and 1 for faulted. The HMI raises HMI.Alarm.Communication_Faulted only while Communication_Faulted is true and EN4TR_Communication_Fault is false. Alarm bits The system raises HMI.Alarm.Communication_Faulted whenever the switch itself loses communication and the EN4TR adapter is still online. ]]>