Process Control Instructions
40 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
If there is no fault present, FaultAlarm is cleared to false if one of the following
conditions is met:
• Command0Status is true and Device0State is true
• Command1Status is true and Device1State is true
• Command2Status is true and Device2State is true
• FaultTime 0
FaultAlarm cannot be cleared to false when FaultAlarmLatch is true, unless
FaultAlmUnlatch is true and no fault is present.
Mode Alarm Conditions
The mode alarm reminds an operator that a device has been left in Operator
control. The mode alarm only turns on when, in Operator control mode, the
program tries to change the state of the device from the operator’s commanded
state. The alarm does not turn on if an operator places a device in Operator
control mode and changes the state. The D3SD instruction checks for mode alarm
conditions, using these rules.
ModeAlarm is When
true
Prog2Command Prog2Command
n-1
and
Prog2Command Command2Status or
Prog1Command Prog1Command
n-1
and
Prog1Command Command1Status or
Prog0Command Prog1Command
n-1
and
Prog0Command Command0Status
false Prog2Command = Command2Status and
Prog1Command = Command1Status and
Prog0Command = Command0Status or
The device is in Override, Hand, or Program control mode
See also
Common Attributes on page 537
Structured Text Syntax on page 508
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