Rockwell Automation 1440-RMA00-04RC XM-440 Master Relay Module - Manual (Page 47)

Rockwell Automation Publication GMSI10-UM009D-EN-P - June 2011
Configuration Parameters 47
Determines whether the relay is failsafe or
non-failsafe.
Failsafe operation means that when in alarm, the
relay contacts are in their “normal,” de-energized, or
“shelf-state” positions. In other words, normally
closed relays are closed in alarm, and normally open
relays are open in alarm. With failsafe operation, a
power failure equals an alarm.
The following are true of a relay in failsafe
operation:
• The relay is energized when power is applied to
the module.
• The relay in a nonalarmed condition has power
applied to the coil.
• In alarm condition, power is removed from the
relay coil, causing the relay to change state.
For non-failsafe operation, the following are true:
• Under nonalarm conditions, the relay closes the
circuit between the common and the N.C.
(normally closed) terminals.
• Under alarm conditions, the relay changes state to
close the circuit between the common and the
N.O. (normally open) terminals.
For failsafe operation, the following are true:
• Under nonalarm (with power applied to the unit)
conditions, the relay closes the circuit between the
common and the N.O. terminals.
• Under alarm or loss-of-power conditions, the relay
changes state to close the circuit between the
common and the N.C. terminals.
Sets the relay activation logic. Enter or select the
number of Input List entries (alarms and relays) that
must be active before the XM-440 relay will activate.
For example, there is one alarm and one relay in the
Input List and you set the Activate relay when
(Logic) parameter to "1." The module will activate
the relay when either the alarm in the list meets or
exceeds the selected Alarm Status condition(s) or
the relay in the list is activated.
Relay Parameters
Parameter Name Description Options/Comments
XM Configuration
Utility EDS File
Failsafe Relay Failsafe
Option
XM Configuration
Utility EDS File
Check means
failsafe Failsafe
Clear means
non-failsafe Nonfailsafe
XM Configuration
Utility EDS File
Activate relay
when any n of n
inputs are
activated. Logic