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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/State Action Taken
Prescan Rung-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 false Rung-condition-out is cleared to false.
Rung-condition-in is true Rung-condition-out is set to true The instruction executes
Postscan Rung-condition-out is cleared to false

Function Block

 

Condition/State Action Taken
Prescan Tag.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 false Tag.EnableOut is cleared to false
Tag.EnableIn is true The instruction executes Tag.EnableOut is set to true
Instruction first run N/A
Instruction first scan N/A
Postscan Tag.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/State Action Taken
Prescan See Prescan in the Ladder Diagram table.
Normal Execution See Rung-condition-in is true in the Ladder Diagram table.
Postscan See Postscan in the Ladder Diagram table.
Examples Ladder Diagram

plc programming  plc

 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.

plc programming functionblok plc
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);

 

Tags: ALMAFunctionLadder
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