Siemens Simatic S7-400 - Manual (Page 335)

Analog Modules
5-119
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 “A”. You can improve the noise immunity of the module in a measuring
environment with serious interference by short-circuiting the channels.
Disable the “Measuring Type” parameter for unused channels. In this way you
shorten the scan time of the module.
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 5-69 Measuring Ranges of the SM 431; AI 16 x 16 Bit
Method Selected Measuring Range
(Type of Sensor)
Measuring Range
Module Setting
Description
U: Voltage " 25 mV
"
50 mV
" 80 mV
" 250 mV
" 500 mV
A You will find the digitized
analog values in Section
5.3.1 in the voltage
measuring range
" 1 V
" 2.5 V
" 5 V
1 to 5 V
" 10 V
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) " 5 mA
" 10 mA
0 to 20 mA
4 to 20 mA
" 20 mA
C You will find the digitized
analog values in Section
5.3.1 in the current
measuring range