State Diagrams When Acknowledgement Not Required - Allen-Bradley Logix5000 Reference Manual

Arithmetic Status Flags:
Fault Conditions:
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA)

State Diagrams when Acknowledgement Not Required

In >= HLimit, MinDurationACC >= MinDurationPRE
HInAlarm = False
In < (HLimit - Deadband)
In <= LLimit, MinDurationACC >= MinDurationPRE
LInAlarm = False
In > (LLimit + Deadband)
In >= HHLimit, MinDurationACC >= MinDurationPRE
HHInAlarm = False
In < (HHLimit - Deadband)
In <= LLLimit, MinDurationACC >= MinDurationPRE
LLInAlarm = False
In > (LLLimit + Deadband)
In(Current Sample)
ROC =
ROCPeriod
ROC >= ROCPosLimit
RocPosInAlarm = False
ROC <= -ROCNegLimit
RocNegInAlarm = False
Arithmetic status flags are set for the ROC output.
Minor Fault
ROC overflow
HInAlarm = True
LInAlarm = True
HHInAlarm = True
LLInAlarm = True
Where a new sample is collected on the
- In(Previou sSample)
next scan after the ROCPeriod has elapsed.
RocPosInAlarm = True
ROC < ROCPosLimit
RocNegInAlarm = True
ROC > -ROCNegLimit
Fault Type
4
Chapter 1
HAcked = True
LAcked = True
HHAcked = True
LLAcked = True
RocPosAcked = True
RocNegAcked = True
Fault Code
4
65