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Siemens LOGO Soft Comfort Online Help Manual

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Reference material
5.3 Special functions
LOGO!Soft Comfort Online Help
328 Operating Instructions, 11/2017
Timing diagram
The nature, manner and speed with which the AQ changes depends on the parameters KC
and TI. Thus, the course of AQ in the diagram is merely an example. A control action is
continuous; therefore the diagram portrays just an extract.
①
A disturbance causes the PV to drop, as Dir is positioned upwards, AQ increases until PV
corresponds again to SP.
②
A disturbance causes the PV to drop, as Dir is positioned downwards, AQ decreases until PV
corresponds again to SP.
Dir is coordinated to the basic conduct of a control loop. The direction (dir) cannot be changed
during the term of the function. The change in Dir here is shown for the purposes of clarifica-
tion.
③
As the input R sets AQ to 0, PV changes. This is based on the fact that PV increases, which on
account of Dir = upwards causes AQ to drop.
PI controller trend view in simulation or online test
When you view the circuit program in an Online test (Page 43) or in a simulation (Page 37),
LOGO!Soft Comfort displays a trend view of the PI controller showing input PV, output AQ
and the parameter SP. The trend view shows the change in AQ and PV over time, in
reference to the SP. The time sampling period is configurable, allowing you to see frequent
samples over a short amount of time, or less-frequent samples over a longer period of time.
Description of function
If the input A/M is 0, then the special function issues output AQ with the value that you set
with parameter Mq.
If the input A/M is 1, then automatic mode commences. As the adopted value Mq is an
integral sum, the controller function begins the calculations in accordance with the formulas
given in Control and regulate basics (Page 319). Uss the updated value PV in the formulas:
… 328 …


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