Siemens SIMATIC S5 ET 200U - Analog Input Module 466-8 MC11, 4 0 to 10 V

7-23
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
The 466–8MC11 analog input module stores each analog value in a single
byte (see Table 7-13). The other analog input modules store the analog values
in words (see Table 7-4).
Table 7-13 Analog Input Module 466–8MC11, 4 0 to 10 V
Units Voltage in mV Bit Representation
255 w9961 1 1 1 1 1 1 1 1
254 9922 1 1 1 1 1 1 1 0
.. .. . .
128 5000 1 0 0 0 0 0 0 0
.. .. . .
1 39 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0
If you want to read in an analog value with function block FB250 (analog
value reading and scaling), you have to pre–process the analog value before
calling up FB250.
Analog input module 466–8MC11 is inserted in slot 1, which means that the
start address of the module is 72.
The analog values that are read in are stored in the following four consecu-
tive bytes:
1. Analog value (channel 0) ³ in IB 72
2. Analog value (channel 1) ³ in IB 73
3. Analog value (channel 2) ³ in IB 74
4. Analog value (channel 3) ³ in IB 75.
Example
Analog Value Processing