Siemens SIMATIC - Measurement Types and Measuring Ranges

Analog modules
6.4 Analog input module SM 331; AI 8 x 16 Bit; (6ES7331-7NF10-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
323
Reassigning parameters in RUN
If you reassign parameters in RUN, the following special characteristic applies.
SF LED is lit:
If a diagnostics was pending prior to reconfiguration, the SF LEDs (on CPU, IM or module)
may be lit even though diagnostics is no longer pending and the module is operating
correctly.
Solution:
● Only assign new parameters if no diagnostics is pending, or
● unplug module and plug it in again.
6.4.1 Measurement types and measuring ranges
Introduction
The measurement type and range is configured at the "measuring type" parameter in
STEP 7 .
Table 6- 9 Measurement types and ranges
Selected type of measurement
Output range
Voltage V:
± 5 V, from 1 V to 5 V, ± 10 V
Current (4-wire transducer)
4DMU
0 mA to 20 mA
4 mA to 20 mA
± 20 mA
Channel groups
The channels of SM 331; AI 8 x 16 bits are arranged in four groups of two channels. You
always assign parameters to a group. The interrupt limits form the exception.
The table below shows the relevant configuration of channel groups. The channel group
number is required to program SFC parameters in the user program.
Table 6- 10 Assignment of SM 331; AI 8 x 16 Bit channels to channel groups
Channels ...
...form one channel group each
Channel 0
Channel group 0
Channel 1
Channel 2
Channel group 1
Channel 3
Channel 4
Channel group 2
Channel 5
Channel 6
Channel group 3
Channel 7