Rievtech xLogic ELC Series User Manual page 179

en
Loop error at the time n;
generally applies: e = SP –
PV
SP
PV
179
Refer to SP and PV
The parameter SP is the set-value
assignment w. For this parameter you
can use the analog output of a
different special function.
PV is the process value x and is
calculated as follows:
PV = (analog value on input * gain) +
offset.
You can connect the input for
example by means of an analog input
with a PT100 sensor.
The gain parameter has an effect on
PV
The offset parameter has an effect on
PV
PV is restricted by the parameters
Min. and Max.
The Dir parameter gives the action
direction of the controller.
Positive means: If set value > process
value then the process value is
increased; if set value < process
value then the process value is
reduced.
Negative means: If set value >
process value then the process value
is reduced; if set value < process
value then the process value is
increased.
e.g. heat regulation: if the set value is
greater than the process value (room
is too cold), the manipulated variable
increases the process value.
"
-10,000 to +20,000
"
0.0 to 10.0
-10,000 to +20,000
In each case: -10,000 to +20,000
- or +