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Safety Device Function Blocks Section 3-5
3-5-3 Emergency Stop Pushbutton Monitoring (E-Stop)
Basic Function The Emergency Stop Pushbutton Monitoring function block allows the user to
monitor an emergency stop pushbutton switch.
Diagram
General Description The Emergency Stop Pushbutton Monitoring function block allows the user to
monitor an emergency stop pushbutton switch.
The Output Enable signal will turn ON if the input from the emergency push-
button 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 all timers are reset at the start of operation.
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
A 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
Default Maximum Number of Outputs
Precautions for Correct Use
A manual reset function is required for emergency stop applications. When
using the Emergency Stop Pushbutton Monitoring function block, you must
also use the Reset function block.
Parameter Setting range Default setting
Input Type Single Channel
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 performed
if 0 is set.
30 ms
Input 1
(NC)
Output
Enable
0
0
1 1
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