Control Units; Setpoint Generator - Siemens SIPART DR21 Manual

Manual
D Control units
The integrated control unit function always includes a setpoint generator and a manual
control station in the following versions:
-- trackable K-setpoint generator
-- S-setpoint generator
-- trackable K-manual control station (S2 = 0)
-- S-two-position control unit with 2 outputs (heating/cooling) (S2 = 1)
-- S-three-position manual control unit internal feedback (S2 =2)
-- S-three-position manual control unit external feedback (S2 =3)
The ability to combine setpoint generator- and manual control station type depends on the
application. Either the setpoint generator or the manual control station can use the K-output,
the remaining function must have an S-output.
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Setpoint generator

S- and K-setpoint generators are installed parallel. In the S-setpoint generator, the
switching outputs ±Δw can be locked depending on the Internal key (16) and the control
signal CB, the status message is output by the signal lamps Int and C, see table 3-7,
page 71. The feedback of the setpoint adjusted incrementally by the switching outputs
takes place via the w-display (input w
1).
In the K-setpoint generator the tracking of the internal setpoint is controlled dependent on
the Internal key (16) and the control signal CB, see table 3-7, page71. The tracking vari-
able is fed in via w
put AO (S56 = 2/3).
With the Shift key (6) the digital x/w-display can be switched between the display levels I
to IV depending on the position of S81. The controlled variable is displayed in the display
level I. In display level II the active w can be displayed, in display level III the controlled
variable x1. The inactive setpoint is displayed in the display level IV. The displayed active
or external setpoint can also be adjusted (see table 3-11, page 84).
The active setpoint- and actual value is displayed on the analog displays.
SIPART DR21
C73000-B7476-C143-08
, the switching is blocked in position Ext, S42 =
EA
. The active setpoint is output by assignment of w to the analog out-
EA
3 Functional description of the structure switches
3.4 Controller types (S1, S42 to S45)
see figure 3-16, page 82
83