Siemens Simatic M7-400 Reference Manual page 299

5.19.1 Commissioning the SM 431; AI 8
You set the mode of operation of the SM 431; AI 8
measuring range modules on the module and in STEP 7.
Measuring Range Module
A measuring range module of the module matches two channels and one
resistance channel to each type of sensor. If necessary, the measuring range
modules must be replugged to change the measuring method and the measuring
range. The steps you have to perform to do this are described in detail in
Section 5.4.
The corresponding table in Section 5.19.2 tells you which assignment you have to
select for which measuring method and measuring range. In addition, the
necessary settings are embossed on the module.
Parameter
You will find a description of the general procedure for assigning parameters to
analog modules in Section 5.7.
An overview of the parameters that you can set and their default settings are
shown in the table below.
Table 5-51 Parameters of the SM 431; AI 8
Parameter
Diagnostics
•
Wire break Yes/no
Measurement
•
Measuring type Disabled
U
4DMU Current (four-wire transmitter)
2DMU Current (two-wire transmitter)
R-4L
R-3L
RTD-4L Thermal resistor
RTD-3L Thermal resistor
TC-L
•
Measuring Refer to Section 5.19.2 for the
range measuring ranges of the input channels
that you can set.
•
Reference – 273.15 to 327.67
Temperature
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
14 Bit
Value Range
Voltage
Resistance (four-conductor
terminal)
Resistance (three-conductor
terminal)
(linear, four-conductor terminal)
(linear, three-conductor
terminal)
Thermocouple (linear)
o
C
Analog Modules
14 Bit
14 Bit by means of
1
Default Parameter
Type
No Static
U
Static
" 10 V
o
0,00 C
Dynamic
Scope
Channel
Channel
Module
5-83