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Safety Device Function Blocks Section 3-5
If a safety gate test ends and a function test request occur in the same cycle
when there is a request for a function test, the function test will be given prior-
ity and a function test error will occur.
The safety gate must be closed (ON), opened (OFF), and then closed again
for the safety gate test. If the gate is closed when the test is started, the test
will end when the gate is opened and then closed. If there are two pairs of
inputs, the test will end when both input pair 1 and input pair 2 turn ON, OFF,
and then ON again independently (without synchronization).
Timing Charts Single Channel, Function Test Set to Enabled
Dual Channel Equivalent, Function Test Set to Disabled
Dual Channel Equivalent (2 pairs), Function Test Set to Disabled
Input 1
Output
Enable
Function
Test Error
Fault
Present
Function
Test Sig.
Function
Test Req.
IDLE to RUN
Input1
(NC)
Output
Enable
Discrepancy
Error
Fault Present
Input2
(NC)
IDLE to RUN
Discrepancy time
Discrepancy time
Input1
(Pair1-NC)
Output
Enable
Sync.
Error
Input2
(Pair1-NC)
Input3
(Pair2-NC)
Fault Present
Input4
(Pair2-NC)
IDLE to RUN
Synchronization time Synchronization time
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