Controller Types (S1, S42 To S45); General, Recurrent Functions; Setpoint Preset Wi Or Nominal Ratio Preset Wvi By The Ses; Source For The External Setpoint (S85) - Siemens SIPART DR21 Manual

Manual
3.4

Controller types (S1, S42 to S45)

3.4.1

General, recurrent functions

D Manual setpoint preset wi or nominal ratio preset wvi on the control front panel.
The internal setpoint can always be adjusted with the ±Δw-keys (14, 15) when the green
internal-LED (1) lights up. The adjusting facility is marked by
this rule are expressly mentioned in the individual controller types. The adjustment operates
incrementally, in the first step with a resolution of 1 digit and then an adjustment progression
so that major changes can also be performed quickly. After every interruption in the adjust-
ment by releasing the keys, the progression starts again with the smallest adjustment step.
D Setpoint preset wi or nominal ratio preset wvi by the SES
Every time the internal setpoint can be adjusted by the keys (7, 8) on the control front panel,
it is also possible to make a preset with the SES. Since only absolute and not incremental
adjustment is possible with the SES, it is advisable to use the setpoint ramp tS to avoid
steps.
In addition, the control signal Int, the automatic-manual switching and the manual manipu-
lated variable adjustment can be set via the SES. This makes a complete, parallel process
operation via the SES possible (see also chapter 3.6, page 94 ).
D Source for the external setpoint (S85)
The external setpoint w
type.
External setpoint as an absolute value via the analog inputs (w
external setpoint as an absolute value via the SES (w
D Setpoint ramp tS
With the parameter tS (oFPA), the adjustment speed of the active setpoint w (in the ratio
controller S1 = 3 the active nominal ratio) can be set over 0 to 100 %. At tS = oFF the ad-
justment speed moves towards 1. With the control signal tS = 1 the set setpoint ramp is
switched off (the setpoint then changes suddenly).
With the setpoint ramp, sudden setpoint switchings to the untracked variables SH, wi, w
S45 = 1 and w can be avoided.
EA ,
1)
as of software version –A5
SIPART DR21
C73000-B7476-C143-08
may come from two different sources depending on the controller
E
3 Functional description of the structure switches
3.4 Controller types (S1, S42 to S45)
↗
in the tables. Exceptions to
) S85 =0, 1, (4, 5)
EA
) S85 = 2, 3
ES
1)
or
at
ES
55