User guide

Rockwell Automation Publication GMSI10-UM019C-EN-P - June 2011

Installing the XM-441 Expansion Relay Module 23

There are four double pole double throw relays in the XM-441. All relay

contacts (24 total) are available for wiring at the terminal base unit, as shown in

Table 2.1 on the page 23.

Figures 2.6 and 2.7 illustrate the behavior of the NC and NO terminals when

the relay is wired for failsafe, alarm or nonalarm condition or non-failsafe,

alarm or nonalarm condition.

IMPORTANT

All XM relays are double pole. This means that each relay

has two contacts in which each contact operates

independently but identically. The following information

and illustrations show wiring solutions for both contacts;

although, in many applications it may be necessary to wire

only one contact.

IMPORTANT

The NC/NO terminal descriptions (pages 20–22)

correspond to a de-energized (unpowered) relay.

When the relay is configured for non-failsafe operation, the

relay is normally de-energized.

When the relay is configured for failsafe operation, the

relay is normally energized, and the behavior of the NC and

NO terminals is inverted.

Table 2.1 Relay Connections for XM-441

Configured for

Failsafe Operation Relay 1 Terminals Relay 2 Terminals Relay 3 Terminals Relay 4 Terminals

Nonalarm Alarm Wire Contacts Contact 1 Contact 2 Contact 1 Contact 2 Contact 1 Contact 2 Contact 1 Contact 2

Closed Opened COM 21 20 24 22 27 25 29 28

NO 5 4 8 6 11 9 13 12

Opened Closed COM 21 20 24 22 27 25 29 28