IDEC SmartRelay functions
IDEC SmartRelay Manual 183
• Analog comparator (actual value Ax - Ay, see Chapter
4.4.18)
• Analog trigger (actual value Ax, see Chapter 4.4.16)
• Analog amplifier (actual value Ax, see Chapter 4.4.20)
• Analog multiplexer (actual value AQ, see Chapter 4.4.26)
• Analog ramp control (actual value AQ, see Chapter
4.4.27)
• Analog math (actual value AQ, see Chapter 4.4.30)
• PI controller (actual value AQ, see Chapter 4.4.28)
• Up/down counter (actual value Cnt, see Chapter 4.4.13)
Select the required function by the block number.
Parameter p (number of
decimals)
Applies only to the
Aen, Ax,
1
and
2
values displayed in a
message text.
Timing diagram
Functional description
A 0 to 1 transition at input En saves the value of the signal at
the ana
log input Ax. This saved process variable is referred
to as ”Aen”.
Both the analog actual values Ax and Aen are mu
ltiplied by
the value at parameter A (gain), and parameter B (offset) is
then added to the product:
(Ax•gain) + offset = Actual value Aen, when input En
changes from
0 to 1, or
(Ax•gain) + offset = Actual value Ax.
Output Q is set when the signal at input En = 1 and if the
actual value at in
put Ax is out of range of
Aen -
2
to Aen +
1
.
Output Q is reset, when the actual value at input Ax lies
within the
range of
Aen -
2
to Aen+
1
, or when the signal at
input En changes to lo.
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