Structured Text; Function Block; Alarm_Digital Structure - Allen-Bradley Logix5000 Reference Manual

ALMD(ALMD, In, ProgAck,
ProgReset, ProgDisable, ProgEnable);
Input Parameter Data Type
EnableIn BOOL
In BOOL
InFault BOOL
Condition BOOL
AckRequired BOOL
Latched BOOL
FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA)

Structured Text

The operands are the same as those for the relay ladder ALMD instruction, with a
few exceptions as indicated above.

Function Block

Operand Type
ALMD tag ALARM_DIGITAL

ALARM_DIGITAL Structure

Description
Relay Ladder
Corresponds to the rung state. Does not affect processing.
Function Block
If cleared, the instruction does not execute and outputs are not updated.
If set, the instruction executes.
Default is set.
Structured Text
No effect. The instruction always executes.
The digital signal input to the instruction.
Default is cleared.
Relay Ladder
Follows the rung condition. Set if the rung condition is true. Cleared if the rung condition is false.
Structured Text
Copied from instruction operand.
Bad health indicator for the input. The user application may set InFault to indicate the input signal has
an error. When set, the instruction sets InFaulted (Status.1). When cleared, the instruction clears
InFaulted (Status.1). In either case, the instruction continues to evaluate In for alarm conditions.
Default is cleared (good health).
Specifies how alarm is activated. When Condition is set, the alarm condition is activated when In is set.
When Condition is cleared, the alarm condition is activated when In is cleared.
Default is set.
Specifies whether alarm acknowledgement is required. When set, acknowledgement is required. When
cleared, acknowledgement is not required and Acked is always set.
Default is set.
Specifies whether the alarm is latched. Latched alarms remain InAlarm when the alarm condition
becomes false, until a Reset command is received. When set, the alarm is latched. When cleared, the
alarm is unlatched.
A latched alarm can be reset only when the alarm condition is false.
Default is cleared.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Format Description
Structure ALMD structure
Chapter 1
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