Siemens SIMATIC S5-100U System Manual page 297

S5-100U
11.6.2 Output of Analog Value - FB251 -
Analog values can be output to analog output modules using this function block. In doing so, values
from the range between the lower limit (UGR) and high limit (OGR) parameters are converted to the
nominal range of the module in question.
Table 11-18.
Parameter Explanation
XE Analog value to be
BG
KNKT Channel number
Channel type
OGR Upper limit of the output
UGR Lower limit of the output
FEH Error in limit value
BU Input value exceeds
Example: Display of Tank Contents on an Analog Measuring Instrument
The make-up quantity of a 30 m
FB250). The ± 20 mA analog output module in slot 1, channel 0, transfers the standardized value
to the measuring instrument. The value is displayed within the range 0 to 20 mA.
PS CPU
AQ
Figure 11-14. Schematic for "Display of Tank Contents"
EWA 4NEB 812 6120-02b
Call and Parameter Assignments of FB251
Type
I W
output
Slot address D KF
D KY
D KF
value
D KF
value
Q BI
setting
Q BI
UGR or OGR
3 tank is stored in flag word 1 as a fixed-point number (see example
Analog Value Processing
Assignment
NAME
Input value (two's
XE
complement) in the
BG
range UGR to OGR
KNKT
OGR
0 to 7
UGR
KY = x,y FEH
x = 0;1
BU
y = 0;1
0: unipolar repre-
sentation
1: bipolar fixed-point
number
-32767 to +32767
-32767 to +32767
"1" if UGR = OGR,
invalid channel or slot,
or invalid channel type
"1" if XE lies outside
limits (UGR; OGR).
XE assumes the limit
value
: JU FB 251
: RLG:AQ
:
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:
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11-25