Rockwell Automation 440C Guardmaster 440C-CR30 Configurable Safety Relay User Manual - Manual (Page 79)

Rockwell Automation Publication 440C-UM001C-EN-P - November 2014 79
Logic Levels A and B Chapter 10
Figure 97 - AND with Restart Timing Diagram
OR with Restart The OR with Restart accepts 2…24 inputs and requires a Restart input. At least
one input must be HI when the Restart button is pressed.
The CCW automatically recognizes the Restart function blocks and allows you
to select one. Once selected, the Restart is no longer available for other logic
blocks.
Figure 98 shows an example with a gate switch and a light curtain. Either the gate
must be closed or the light curtain clear. Then, the Restart input must be pressed.
The output of the logic block goes HI on the trailing edge of the restart signal.
Figure 98 - Example OR with Restart
Input 1
Restart
Input 2
Output
HI
LO
HI
LO
HI
LO
HI
LO
AND