Rockwell Automation Publication 440R-UM013E-EN-P - March 2017 77
Troubleshooting Chapter 11
Two-handed Reset Operation
Does your application have an E-stop mounted close to the reset button, which
allows you to release the E-stop with one hand and press the reset button with
the other? Does your application let you close a safety gate with one hand and
press the reset button with the other hand? These configurations are not a
problem with GSR relays because the reset signal can be pressed 10 ms after the
relay inputs are satisfied.
Applications with OSSD Outputs and Test Pulses
If your application uses an OSSD output with test pulses as the source of my
reset signal, do the GSR relays execute the reset function properly as shown in
Figure 74
?
Test pulses are much less than 1 ms wide. GSR relays ignore test pulses up to
6ms in duration. Figure 74
shows a reset signal that is 2500 ms long. During
this time, a 6 ms test pulse occurs. This test pulse is ignored. A test pulse of
7 ms causes the GSR relay to execute the reset function, provided the test pulse
occurs after 250 ms.
Figure 74 - Reset Input Ignores Test Pulses up to 6 ms
24V
2500 ms
0V
0V
Ignores Test
Pulse up to
6 ms
Reset occurs on trailing edge
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