14
Rockwell Automation Publication 440R-UM014D-EN-P - December 2019
Chapter 3
Power, Ground, and Wire
, the monitoring voltage of the relay on the left is 200 mV…4V; the
relay on the right has a monitoring voltage from 20…400 mV.
Figure 5 - Relay Face and Terminal Identification
lists the terminal functions.
Table 3 - Terminal Assignments and Functions
Connect Power Supply
Power for the MSR55P safety relay depends on the model. The primary power
supply is connected to terminals A1 and A2. An auxiliary (12…30V DC only)
supply voltage can be connected to terminals A3/A4 to provide semiconductor
diagnostics.
Terminal
Function
A1(+)-A2(-)
Power supply
L1/L2/L3
Motor connections
11/12
Voltage-free redundant monitoring (non-safety) contacts (N.C.)
23/24, 33/34, 43/44
Voltage-free redundant safety contacts (N.O.)
53/54
Voltage-free monitoring (auxiliary) contact (N.O.)
X1/X2
Connection for feedback circuit
X3/X2
Reset for fault conditions.
A3(+) -A4(-)
Power supply for semiconductor outputs
ON
Semiconductor output indicates that safety outputs are ON.
ERR
Semiconductor output indicates fault condition.
53 54 L1 L2 L3
X1 X2 X3 11 23 33 43
12 24 34 44
A3 A4 ON ERR A1 A2
OUT
ERR
PWR
53 54 L1 L2 L3
X1 X2 X3 11 23 33 43
12 24 34 44
A3 A4 ON ERR A1 A2
OUT
ERR
PWR
.2
.4
.7
MSR55P
1
1.5
2
3
4
.5
.3
.2
.7
ts
Vm
1
1.5
2
3
4
6
.5
.3
2
4
7
MSR55P
10
15
20
30
40
5
3
.2
.7
ts
x10mVm
1
1.5
2
3
6
.5
.3
33
23
11
43 53
34
24
12
44 54
33
23
11
43 53
34
24
12
44 54
4
