Rockwell Automation 1440-TPR06-00RE XM-360 Process Module - Manual (Page 57)

Publication GMSI10-UM006C-EN-P - August 2010
Configuration Parameters 49
Relay Parameters The Relay parameters control the operation of the relays. The XM-360 module
does not have an on-board relay. The relays are added when an Expansion
Relay (XM-441) module is connected to the XM-360. The XM-360 supports
two Expansion Relay modules for a total of eight relays. Use these parameters
to configure which alarm(s) the relay is associated with, as well as the behavior
of the relay.
Hysteresis The amount that the measured value must fall
(below the threshold) before the alarm condition is
cleared. For example, Alert Threshold = 120 and
Hysteresis = 2. The alarm (alert) activates when the
measured value is 120 and will not clear until the
measured value is 118.
Note: The Alert and Danger Thresholds use the
same hysteresis value.
Note: For the Outside Range condition, the
hysteresis value must be less than Alert Threshold
(High) – Alert Threshold (Low).
Same measurement unit as Data
Units selection for the specified
channel. Note that for rate alarms, it is
unit per minute.
Alarm Parameters
Parameter Name Description Values/Comments
IMPORTANT
A relay can be defined, regardless of whether or not it is
physically present. A non-physical relay is a virtual relay.
When a relay (physical or virtual) activates, the module
sends a Change of State (COS) message to its master,
which acts on the condition as necessary. An XM-440
Master Relay Module can activate its own relays in response
to a relay (physical or virtual) activation at any of its slaves.
Relay Parameters
Parameter Name Description Options/Comments
Number (XM Serial Configuration
Utility only) Sets the relay to be configured in the XM Serial
Configuration Utility. The relays are either relays on the
Expansion Relay module when it is
connected to the XM-360 or virtual
relays.
Virtual relays are non-physical relays.
Use them when you want the effect of
the relay (monitor alarms, delay, and
change status) but do not need an
actual contact closure. For example, a
PLC or controller monitoring the relay
status.
Note: The Relay Installed parameter
indicates whether a relay is a virtual
relay or a physical relay on a module.