Siemens SIMATIC S5-90U System Manual page 319

S5-90U/S5-95U
Parameter
XE
BG
KNKT
OGR Upper limit of the
UGR Lower limit of the
FEH
BU Input value exceeds
Duration of Input and Output of the Analog Value
Reading the analog value from the PII by means of FB250 takes max. 5.9 ms (cf. Table 12-10).
Output of the analog value to the PIQ by means of FB251 takes max. 5 ms (cf. Table 12-16).
Accuracy of the Analog Value
1. Input Value:
Value read = 5 V
Nominal analog input value = 10 V
Operational limit = 1.68 V
Absolute error = 10 V
5 V - 0.168
Actual value=
The accuracy of the analog value read in varies within the range of + 0.168 V corresponding to
°
± 0.8 C.
EWA 4NEB 812 6115-02b
Table 12-20. Parameters for FB251
Meaning Type
Analog value to I W
be output
Slot number D KF
Channel number D KY
Channel type
D KF
output value
D KF
output value
Error in the limit Q BI
value setting
Q BI
UGR or OGR
1.68%
0.168 V
=
100%
Actual value
5 V ± 0.168 V
Analog Value Processing
Assignment
Input value (2's complement)
in the UGR to OGR range
8 (for onboard I/Os)
KY=x,y
x=0 (for onboard I/Os)
y=0 unipolar representation
- 32767 to +32767
- 32767 to +32767
"1" if UGR = OGR, for invalid channel or slot
number, or invalid channel type
"1" if XE is outside the range (UGR; OGR).
XE accepts the limit value
5 V + 0.168 V
12-17