Rockwell Automation Publication 440R-UM013G-EN-P - December 2022 45
Chapter 9
Application and Wiring Examples
The application and wiring examples in this chapter show you how to put the inputs and
outputs together to create an operating safety system. These circuit diagrams are examples;
many features are interchangeable between safety relays.
Publication SAFETY-WD001
provides additional application and wiring diagrams.
CI Safety Relay
(Cat.No.440R-S13R2)
In Figure 43, the CI safety relay is monitoring a device (an E-stop push button) with
mechanically operated contacts. The CI safety relay is configured for monitored manual (MM)
reset. The output turns on if the E-stop is released and the Reset push button is pressed and
released between 0.25…3 seconds. The CI safety relay monitors the status of the two output
contactors, K1 and K2. If either fails to close their N.C. contacts, the CI safety relay does not
reset. An auxiliary signal, terminals 41/42, is sent to the PLC when the E-stop is pressed.
Figure 43 - Mechanical Contacts with Monitored Manual Reset
Figure 44 on page 46 shows a CI safety relay monitoring a safety light curtain with two OSSD
outputs. The CI safety relay is set to automatic/manual reset (AM). The auxiliary signal
(terminals 41/41) informs the PLC that the safety system is off or on. The CI safety relay
outputs connect to AC voltage loads. When the CI safety relay is on, the PLC can then turn on
the K1 and K2 contactors.
S11
S12
S21
S22
S34 A1 13
L11A2 14
23
24
33 41
34 42
CI
440R-S13R2
0
MM
AM
K1
24V DC
24V Com
K2
K1 K2
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