48 Rockwell Automation Publication 440R-UM013G-EN-P - December 2022
Chapter 9 Application and Wiring Examples
EM Safety Relay
(Cat.No.440R-EM4R2)
The EM safety relay in Figure 49 expands the number of outputs of the DI safety relay. The
single wire safety signal from terminal L11 to L12 instructs the EM safety relay to turn on and
off. The EM safety relay outputs mimic the DI safety relay outputs. The DI safety relay monitors
contactors K1…K6 and the status of the EM safety relay by sourcing the reset signal from the
X32 terminal on the EM safety relay.
Figure 49 - Expansion of Immediate Safety Outputs
EMD Safety Relay
(Cat.No.440R-EM4R2D)
The EMD safety relay in Figure 50 is configured for a 5 second off-delay. The single wire safety
signal from terminals L11 to L12 instructs the EMD safety relay to turn on and off. When the
E-stop is pressed, the CI safety relay turns off immediately and the EMD safety relay turns off
5 seconds later. The CI safety relay monitors contactors K1…K6 and the status of the EMD
safety relay by sourcing the reset signal from the X32 terminal on the EMD safety relay.
In this example, the jumper from B1 to B2 makes the EMD safety relay retriggerable. If the
E-stop is released and the reset is pressed within the 5 second delay time, the outputs of the
EMD safety relay do not turn off because the internal timer is retriggered.
Figure 50 - EMD Safety Relay - Off Delay
Figure 51 on page 49 shows the EMD safety relay that is configured for a 2.1 second on-delay.
The single wire safety signal from terminals L11 to L12 instructs the EMD safety relay to turn on
and off. When the Reset button is pressed, the DIS safety relay outputs turn on immediately.
After a 2.1 second delay, the EMD safety relay outputs turn on.
The DIS safety relay monitors contactors K1…K4 and the status of the EMD safety relay by
sourcing the reset signal from the X32 terminal on the EMD safety relay.
A1
L11
X32
L12 14 34
44
24
13 33 4323
A2
EM
440R-EM4R2
A1
S11 S21 S12S22
S32 L11 Y32L12
13
14S42
23
24
S34
A2
DI
440R-D22R2
0
1
2
3
4
56
7
8
K1
24V DC
24V Com
K2
K6
K5
K3
K4
K1
K2 K3 K4
K5 K6
A1
L11
X32B1 B2
L12 18 38 4828
17 37 4727
A2
EMD
440R-EM4R2D
0
1
2
3
4
5
6
7
8
9
1
2
3
4
5
67
8
10
9
K1
24V DC
24V Com
K2
K6
K5
K3
K4
K1
K2 K3 K4
K5 K6
S11
S12
S21
S22
S34A1 13
L11A2 14
23
24
33 41
34 42
CI
440R-S13R2
0
MM
AM
RESET
Reset
To PLC
RANGE
TIME
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