IDEC SMARTRELAY User Manual page 245

Timing diagram (example)
Functional description
ERst = 1 and En = 0: the function sets the AQ value to 0.
ERst = 1 and En = 1: the function outputs a value at AQ, depending on the settings of Mode
and S1.
ERst = 0 and En = 0: the function holds the value of AQ at the current value.
ERst = 0 and En = 1: the function outputs a value at AQ, depending on the settings of Mode
and S1.
Mode = 0: the function sets AQ to the minimum value
Mode = 1: the function sets AQ to the maximum value
Mode = 2 and S1 = 0: the function sets AQ to the minimum value
Mode = 2 and S1 = 1: the function sets AQ to the maximum value
Mode = 3: the function outputs current analog input value.
IDEC SmartRelay Manual
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IDEC SmartRelay functions
4.4 Special functions list - SF
233