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Issue 5 - September 2006
Page 42 of 65
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Network 002 - System Repair Time Constraint and Diagnostic Shutdown.
Scan Rate 00030 ms
Label 01004 Enabled
ESD
15853
6003
15853
6002
6003
01800
1.0s
R1217
6002
6007
03600
1.0s
R1214
6007
02353
CTU
R1215
6007
6008
6006
6008
6009
GLOBAL
O/P
FAULT
OPERATION
UNDER TIME
CONSTRAINT
TIME
CONSTRAINT
TIMER
TIME
CONSTRAINT
TIMER
OverlapDis 15853
WorkingDis6003
WorkingDis6007
WorkingDis6007
OPERATION
UNDER TIME
CONSTRAINT
TIME
CONSTRAINT
RESET
WorkingDis6003
WorkingDis6002
GLOBAL
O/P
FAULT
OverlapDis 15853
TIME
CONSTRAINT
RESET
WorkingDis6002
TIME
CONSTRAINT
TIMER
WorkingDis6007
TIME
CONSTRAINT
SHUTDOWN
WorkingDis6008
DIAGNOSTIC
PLC
SHUTDOWN
TIME
CONSTRAINT
SHUTDOWN
COMBINED
PLC
SHUTDOWN
WorkingDis6006
WorkingDis6008
WorkingDis6009
If the system has any single element safety outputs, or any dual element safety outputs are configured on a
single output module than the system must be configured with a time constraint (Mandatory). This timw
constraint is set in hours in the Up counter (Minimum 2353 hours for SIL 3, 7440 hours for SIL 2 or 23528
hours for SIL 1). The Time Constraint counter and timer is reset once the Output Fault is cleared and
remians clear for the system test time (set in the system test time timer R1217). The system test time is
calculated as equal to the Number of Modules x 20 seconds).
The Time Constraint shutdown (discrete 6008) is combined with the Diagnostic shutdown (discrete 6006) to
give a single PLC shutdown (via discrete 6009). This should be latched within the Application logic.