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Siemens LOGO Soft Comfort Online Help Manual

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5.3 Special functions
LOGO!Soft Comfort Online Help
Operating Instructions, 11/2017
329
Updated value PV = (PV * gain) + offset
If the updated value PV = SP, then the special function does not change the value of AQ.
Dir = upwards/+ (timing diagram numbers 1 and 3)
● If the updated value PV > SP, then the special function reduces the value of AQ.
● If the updated value PV < SP, then the special function increases the value of AQ.
Dir = downwards/- (timing diagram number 2)
● If the updated value PV > SP, then the special function increases the value of AQ.
● If the updated value PV < SP, then the special function reduces the value of AQ.
With a disturbance, AQ increases or decreases until the updated value PV again
corresponds to SP. The speed with which AQ changes depends on the parameters KC and
TI.
If the input PV exceeds the parameter Max., then the updated value PV is set to the value of
Max. If the PV falls short of the parameter Min., then the updated value PV is set to the value
of Min.
If the input R is 1, then the AQ output is reset. As long as R is set, the input A/M is disabled.
Sampling time
The sampling time fixs at 500 ms.
Parameter sets
In order to simplify the use of the PI controller, the parameters for KC, TI and Dir are already
given as sets for the following applications:
Parameter set
Application example
Parameter
KC
Parameter
TI (s)
Parameter
Dir
Temperature
fast
Temperature, cooling control of small
spaces; small volumes
0.5 30 +
Temperature
slow
Heating, ventilation, temperature, cool-
ing control of large spaces; large vol-
umes
1.0 120 +
Pressure 1 Quick pressure change, compressor
control
3.0 5 +
Pressure 2 Slow pressure change, differential pres-
sure control (flow controller)
1.2 12 +
Full level 1
Vat and/or reservoir filling without drain
1.0
99:59
+
Full level 2
Vat and/or reservoir filling with drain
0.7
20
+
Characteristics when configuring
Observe the control and regulate basics (Page 319).
… 329 …


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