Siemens SIMATIC S5-90U System Manual page 457

S5-90U/S5-95U
Function
The module 6ES5 466-8MC11 is suitable for connection of voltage sensors.
For wiring of the module (two-wire connection) see block diagram (on the first page of the module
description).
Analog Value Representation
The analog input module stores the analog values in one byte each; it thus differs from other analog
input modules, which store the analog values in a word.
Table 15-32. Analog Input Module 466-8MC11, 4 x 0 to 10 V
Units
255
254
192
191
128
127
64
63
1
0
If you want to read in the analog value with function block FB250 (analog value reading), you have
to pre-process the analog value before calling up FB250.
Example
Analog input module 466-8MC11 is inserted in slot 1, which means that the module's start address
is 72.
The analog values are stored in four consecutive bytes:
1st analog value (channel 0)
2nd analog value (channel 1)
3rd analog value (channel 2)
4th analog value (channel 3)
The function block shown reads in the analog values and pre-processes them for the FB250 (read
in analog value) OR (analog value reading).
FB
0005 :
0006 :L IB 75
0007 :SLW 6
0008 :T IW 78
0009 :JU FB 250
000A :
EWA 4NEB 812 6115-02b
Input voltage in V
9.961
9.922
7.500
7.461
5.000
4.961
2.500
2.461
0.039
0.000
in IB72
in IB73
in IB74
in IB75
SLOT 1, CHANNEL 3
PRE-PROCESS ANALOG VALUE AND
WRITE BACK TO PII SO THAT
FB 250 CAN ACCESS IT
Bit
7 6 5 4 3
7 6 5 4 3
2 2 2 2 2
1 1 1 1 1
1 1 1 1 1
1 1 0 0 0
1 0 1 1 1
1 0 0 0 0
0 1 1 1 1
0 1 0 0 0
0 0 1 1 1
0 0 0 0 0
0 0 0 0 0
Explanation
Module Spectrum
2 1 0
2 1 0
2 2 2
1 1 1
1 1 0
0 0 0
1 1 1
0 0 0
1 1 1
0 0 0
1 1 1
0 0 1
0 0 0
15-91