Siemens Simatic S7-400 - Manual (Page 314)

Analog Modules
5-98
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Unused Channels
Unused channels can usually be left open. Put the measuring range modules in
position “B”. You can improve the noise immunity of the module in a measuring
environment with serious interference by connecting M– and M
ANA
.
Measuring Ranges
You set the measuring ranges by means of the measuring range modules on the
module and the “Measuring Type” parameter in STEP 7.
Table 5-60 Measuring Ranges of the SM 431; AI 8 x 14 Bit (6ES7431-1KF20-0AB0)
Method Selected Measuring Range
(Type of Sensor)
Measuring Range
Module Setting
Description
U: Voltage "
1 V A You will find the digitized analog
l i S ti 5 3 1 i th
1 to 5 V
"
10 V
B
values in Section 5.3.1 in the
voltage measuring range
2DMU: Current
(two-wire transmitter) 4 to 20 mA D To supply these transmitters with
current you must connect 24 V to
the L+ and M front connector
terminals.
You will find the digitized analog
values in Section 5.3.1 in the
current measuring range
4DMU: Current
(four-wire transmitter) 4 to 20 mA
"
20 mA
C You will find the digitized analog
values in Section 5.3.1 in the
current measuring range
R-4L: Resistor
(four-conductor
terminal)
600
W
A You will find the digitized analog
values in Section 5.3.1 in the
resistance measuring range
Default Settings
The module has the following default settings in STEP 7:
• Channels 0 to 7: “Voltage” for the measuring method ; “ " 10 V” for the
measuring range
You can use these measuring methods and measuring ranges without
parameterizing the SM 431; AI 8
14 Bit in STEP 7.