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PLC ALMA Function Ladder Programming

Studio 5000 Logix Emulate (Virtual PLC)
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PLC ALMA Function

Execution Ladder Diagram

Condition/StateAction Taken
PrescanRung-condition-out is cleared to false.

All of the ALMA structure parameters are cleared All alarm conditions are acknowledged.

All operator requests are cleared All timestamps are cleared

All delivery flags are cleared.

Rung-condition-in is falseRung-condition-out is cleared to false.
Rung-condition-in is trueRung-condition-out is set to true The instruction executes
PostscanRung-condition-out is cleared to false

Function Block

 

Condition/StateAction Taken
PrescanTag.EnableOut is cleared to false.

All of the ALMA structure parameters are cleared All alarm conditions are acknowledged.

All operator requests are cleared All timestamps are cleared

All delivery flags are cleared.

Tag.EnableIn is falseTag.EnableOut is cleared to false
Tag.EnableIn is trueThe instruction executes Tag.EnableOut is set to true
Instruction first runN/A
Instruction first scanN/A
PostscanTag.EnableOut is cleared to false

 

Structured Text

In Structured Text, EnableIn is always true during normal scan. Therefore, if the instruction is in the control path activated by the logic it will execute.

Condition/StateAction Taken
PrescanSee Prescan in the Ladder Diagram table.
Normal ExecutionSee Rung-condition-in is true in the Ladder Diagram table.
PostscanSee Postscan in the Ladder Diagram table.
Examples Ladder Diagram

 Function Block

 An example of an ALftA instruction in Function Block is shown below. In this example, the Tank 32 Level Transmitter (Tank32LT) is monitored for alarm conditions. The Tank32LevelAck tag can be used to acknowledge all conditions of this alarm.

Structured Text

 In this example, the Tank 32 Level Transmitter (Tank32LT) is monitored for alarm conditions. The Tank32LevelAck tag can be used to acknowledge all conditions of this alarm.

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ALMA(Tank32Level,Tank32LT,Tank32LevelAck,0, 0);

 

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