Rockwell Automation 440C Guardmaster 440C-CR30 Configurable Safety Relay User Manual - Manual (Page 78)

78 Rockwell Automation Publication 440C-UM001C-EN-P - November 2014
Chapter 10 Logic Levels A and B
Table 13 - NOT Logic Table for Two Inputs
AND with Restart The AND with Restart accepts 2…24 inputs and requires a Restart input. All
inputs 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 95 shows an example with a gate switch and a light curtain. Both the gate
must be closed and 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 95 - Example of AND with Restart
Figure 96 - Logic of the Restart Function with Two Input AND
The timing diagram shows how the output of the Logic block responds to the
input signals and the Restart signal. Both inputs must be HI when the Restart
signal occurs for the output to go HI. If any of the inputs go LO, the output goes
LO.
Input Output
0 1
1 0
Restart
Input 1
Input 2
&