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Safety Device Function Blocks Section 3-5
Diagram
General Description The Light Curtain Monitoring function block monitors a type-4 safety light cur-
tain.
The Output Enable signal will turn ON if the input from the safety light curtain
being monitored is active. The Output Enable signal will turn OFF if the input
is inactive or if an error is detected for the function block.
Startup All errors are turned OFF and timers are reset at the start of operation. Out-
puts are turned ON or OFF according to the input status.
Set Parameters
The timer SV must be longer than the cycle time.
Optional Output
Setting
The following error output can also be used in programming. To enable this
optional output, select the check box on the Output Point Tab Page of the
function block properties dialog box.
• Discrepancy 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: Dual Channel Equivalent
0: OFF, 1: ON
Setting: Dual Channel Complementary
0: OFF, 1: ON
Default Maximum Number of Outputs
Parameter Setting range Default setting
Input type Dual Channel Equivalent
Dual Channel Complementary
Dual Channel Equivalent
Discrepancy time 0 to 30 s in 10-ms increments
A discrepancy time check will not be per-
formed if 0 is set.
30 ms
Input 1
(NC)
Input 2
(NC)
Output
Enable
00
0
01
0
100
111
Input 1
(NC)
Input 2
(NO)
Output
Enable
00
0
010
101
110
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