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Safety Device Function Blocks Section 3-5
Set Parameters
The timer SV must be longer than the cycle time.
Optional Output
Settings
The following outputs can also be used in programming. To enable any of
these optional outputs, select the check box on the Output Point Tab Page of
the function block properties dialog box.
• Discrepancy Error Pair 1
• Discrepancy Error Pair 2
• Function Test Required Signal
• Synchronization Error
• Function Test Error
Fault Present Output
Setting
Fault Present output can also be used in programming.
To enable this output, select the Fault Present check box on the Output Point
Tab Page of the function block properties dialog box.
Truth Tables Setting: Single Channel
0: OFF, 1: ON
Setting: Dual Channel Equivalent (1 Pair)
0: OFF, 1: ON
Parameter Setting range Default setting
Input Type Single Channel
Dual Channel Equivalent (1 pair)
Dual Channel Complementary (1 pair)
Two Dual Channel Equivalent (2 pairs)
Two Dual Channel Complementary (2 pairs)
Dual Channel
Equivalent
(1 pair)
Function Test No Function Test/Function Test Required No function test
Discrepancy Time
Pair 1
0 to 30 s in 10-ms increments
A discrepancy time check will not be performed if 0 is
set.
30 ms
Discrepancy Time
Pair 2
Synchronization
Time
0 to 30 s in 10-ms increments
A synchronization time check will not be performed if 0
is set.
300 ms
Input 1
(pair 1-NC)
Output
Enable
0
0
1 1
Input 1
(pair 1-NC)
Input 2
(pair 1-NC)
Output
Enable
00
0
010
100
111