18 Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Chapter 3 Power, Ground, and Wire
Unlock Request Input
The Unlock Request Input can be connected to the 24V supply through a
momentary, normally open push button switch or to a 24V sourcing output of
a programmable logic controller (PLC), where the PLC turns the request ON
or OFF. Some examples of RockwellAutomation PLC output modules are
shown in Figure 12
.
The unlock request is connected to Terminal S54.
Figure 12 - Unlock Request Wiring
Lock and Reset Request
Input
The Lock and Reset Input can be connected to the 24V supply through a
momentary, normally open push button switch or to a 24V sourcing output of
a PLC where the PLC turns the request ON or OFF. Some examples of
RockwellAutomation PLC output modules are shown in Figure 13
.
In some safety system applications, the reset signal also serves as a monitoring
function. For example, when the safety outputs are driving safety contactors,
the normally closed contacts of the safety contactors should be connected in
series with lock and reset circuit.
The lock and reset request is connected to Terminal S44.
Figure 13 - Lock Request Wiring
+24V DC
24V DC Com
+
1
2
3
Momentary
Normally-Open
Push Button
PLC Output
1756-OB16
1769-OB8
1746-OB4
1734-OB2
1793-OB4
PLC
Processor
GLT
S54
A1
A2
GLT
S54
A1
A2
+24V DC
24V DC Com
+
1
2
3
Momentary
Normally-Open
Push Button
PLC Output
1756-OB16
1769-OB8
1746-OB4
1734-OB2
1793-OB4
PLC
Processor
GLT
S44
A1
A2
GLT
S44
A1
A2
Contactor
Monitoring
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