Digital Alarm (Almd); Relay Ladder - Allen-Bradley Logix5000 Reference Manual

Chapter 1 FactoryTalk Alarms and Events Logix-based Instructions (ALMD, ALMA)

Digital Alarm (ALMD)

Operand Type
ALMD tag ALARM_DIGITAL
In BOOL
ProgAck BOOL
ProgReset BOOL
ProgDisable BOOL
ProgEnable BOOL
MinDurationPRE DINT
MinDurationACC DINT
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The ALMD instruction detects alarms based on Boolean (true/false) conditions.
Program (Prog) and operator (Oper) control parameters provide an interface for
alarm commands.
Operands:

Relay Ladder

In relay ladder, the alarm condition input (In) is obtained from the rung
condition.
Format
Structure
Tag
Immediate
Tag
Immediate
Tag
Immediate
Tag
Immediate
Tag
Immediate
Immediate
Immediate
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Description
ALMD structure.
Structured text only.
Value is copied to In when instruction executes. The alarm input value
is compared to determine whether there is an alarm.
Value is copied to ProgAck when instruction executes. On transition
from cleared to set, acknowledges alarm (if acknowledgement is
required).
Value is copied to ProgReset when instruction executes. On transition
from cleared to set, resets alarm (if required).
Value is copied to ProgDisable when instruction executes. When set,
disables alarm (does not override Enable Commands).
Value is copied to ProgEnable when instruction executes. When set,
enables alarm (takes precedence over Disable Commands).
Relay ladder only.
Specifies how long the alarm condition must be met before it is
reported (milliseconds).
Relay ladder only.
Indicates the number of milliseconds that have elapsed since the
alarm condition was met.