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What is the difference between VALUE, TRUE_VALUE and FORCED_VALUE of M580 IO Variable.

Below are the descriptions: 

VALUE: 

Channel value. It represents the value used in the application and is either the FORCED_VALUE or the TRUE_VALUE depending on the FORCED_STATE. 

FORCED_VALUE : 

Value applied to an output or interpreted as an input during forcing. If FORCED_STATE = 1 then VALUE = FORCED_VALUE 


TRUE_VALUE : 

Represents the true value of the analog output or input whatever the state of the forcing command 
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