Easy Electronics xLogic Micro PLC User Manual page 161

Short description
This special function saves the process variable of an analog input to memory, and sets the output when
the output variable exceeds or drops below this stored value plus a configurable offset.
Connection
Input En
Input Ax
Parameter
Output Q
Parameter p (number of decimals)
The two threshold parameters Threshold 1 and Threshold 2 can be provided by the actual value of
another already-programmed function:
Analog comparator: Ax – Ay
Analog trigger: Ax
Analog amplifier: Ax
Analog multiplexer: AQ
Analog ramp: AQ
Analog math: AQ
PI controller: AQ
Data latching relay: AQ
Up/Down counter: Cnt
Applies only to the display of Aen, Ax and Delta values in a message text.
Timing diagram
161
Description
A positive edge (0 to 1 transition) at input En saves
the analog value at input Ax ("Aen") to memory and
starts monitoring of the analog range Aen ± Delta.
You apply the analog signal to be monitored at input
Ax.
Use the analog inputs AI1...AI8, the analog
outputs AQ1 and AQ2.
0 - 10 V is proportional to 0 - 1000 (internal value).
A: Gain
Range of values: ± 10.00
B: Zero offset
Range of values: ± 10,000
Delta: Difference value for the Aen on/off threshold
Range of values: ± 20,000
p: Number of decimals
Range of values: 0, 1, 2, 3
Q is set/reset, depending on the stored analog value
and the offset.