Siemens SIPART DR21, Manual

Page: 120 / 242

3 Functional description of the structure switches
3.10 Other functions of the standard controller
Manual
120
SIPART DR21
C73000-B7476-C143-08
3.10.5 Restart conditions (S82, S83)
The restart conditions after mains recovery are determined with S82. With S82 = 0 the con-
troller starts after mains recovery and after a watch-dog-reset with the operating mode and with
the y which was active before the power failure. This variation must be used when temporary
mains failures are to be expected in slow control circuits.
With S82 = 1 starting after mains recovery takes place in manual- and in internal operation with
ys in the K-controller (S2 = 0) and two-position controller (S2 = 1) or with the last y in the three-
position controller (S2 = 2, 3). If only external operating mode or only automatic operation was
selected by S42 = 1 or S51 = 1 respectively, the restart takes place in these operating modes.
With S83 the optical signaling of mains voltage recovery and reset is determined by flashing of
the digital x-display. The flashing is acknowledged by pressing the Shift key (6) or by an alarm
request via SES.
3.10.6 Serial interface and PROFIBUS-DP (S84 to S91)
The structure switch determines whether operation is with SES (S84 = 1/2/3
*)
) or without SES
(S84 = 0) (see also “Control system coupling via the serial interface”, page 109).
With S85 the depth of the SES-interventions is preset. Generally all available set data are read.
In position 0 no transmission and reception of data to the controller is possible. In position 1
only parameters and structures can be transmitted. In positions 2 to 5 the process variables
w
ES
(external setpoint via the SES), wi
ES
(internal setpoint via the SES), y
ES
(external manipu-
lated variable via the SES), yH
ES
(manual manipulated variable via the SES) and all control sig-
nals can be sent additionally via the SES. At the same time, S85 switches over the sources for
the external setpoint w
ES
or w
EA
and for the tracking manipulated variable y
ES
or y
N
. This
makes it possible to preset the process variables and the control signals only via the SES or the
process variables analogly and only the control signals via the SES.
With S84 = 1/2 writing of status signal Si
ES
to tSH
ES
can be locked via /RC or CB.
The structure switches S86 to S91 determine the transmission procedure through the serial
interface. See the user guide “Serial SIPART DR21 Bus Interface” for explanations; Internet
address: www.fielddevices.com [Edition 05.2000].
Settings for PROFIBUS-DP see table 5-5, page 172 (structure switch list).
*) as of software version C1