Allen-Bradley 1444-AOFX00-04RB, User Manual, Page: 225 / 550

Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 225
Configure Alarms Chapter 8
Output Tag Gate Control Select Off, Alarm Control 0 or Alarm Control 1 Enables a control to be used to manage the enabling
(control set) and the disabling (control unset) of the Voted
Alarm.
Control inputs are normally implemented using one of the
two Alarm Control output tags (control 0 = bit 5, control 1
= bit 6). Alternatively, control can be provided using either
of the discrete inputs (See
Hardware Configuration on
page 112 ).
Output Tag Override Control Select Off, Alarm Control 0 or Alarm Control 1 Enables a control to be used to manage activating a Voted
Alarm, regardless of other definition and the state of any
defined measurement alarm inputs. If defined, when the
selected control is set, the voted alarm actuates. The
capability can provide either of:
• A means to test the relay / output behavior of the voted
alarm without having to satisfy the defined alarm
conditions.
• A means to use the controller to manage associated
relays directly. In this condition, the remainder of the
voted alarm definition is inconsequential as it is used
only to map relays for direct controller management.
Control inputs are normally implemented using one of the
two Alarm Control output tags (control 0 = bit 5, control 1
= bit 6). Alternatively, control can be provided using either
of the discrete inputs (See
Hardware Configuration Page
on page 111 ).
Relay Control – Fail-Safe Enable Checked (1) / Unchecked (0) Check to enable Fail-Safe for any relay that is assigned to
this Voted Alarm.
Fail-Safe is applicable only to physical relays that are
assigned to the Voted Alarm.
Fail-Safe is used to help make sure that if a loss of power
occurs to the relay that it fails in a ‘safe’ state. The safe
state is generally the same as the Alarm state.
Relay Control – Latch Enable Checked (1) / Unchecked (0) Check to enable Latching on this Voted Alarm.
Latching is applied to the Voted Alarm and is extended to
any relays that are assigned to the alarm.
A latched Voted Alarm (and associated relay) can be reset
after the alarm condition has cleared. Set the AlarmReset
bit (bit 7) in the controller Control tag output, or if a
discrete input is assigned this function, then by signaling
that input. (See
Hardware Configuration Page on
page 111 ).
Table 47 - Voted Alarms (continued)
Parameter Name Values Comments
Fail-Safe
Behavior Relay Coil Status
In Alarm Not in Alarm
Non-Fail-Safe energized de-energized
Fail-Safe de-energized energized