Siemens S7-400PLC Dokumentacja Strona 282

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Analog modules
5.21 Analog input module SM 431; AI 8 x 14 Bit (6ES7431-1KF20-0AB0)
S7-400 Automation System Module Data
282 Reference Manual, Edition 09/2009, A5E00850736-06
Example
If you select "current (2-wire transducer)" for channel 6, you can only disable the measuring
method or set "current (2-wire transducer)" for channel 7.
Circuit for resistance measurement
The following conditions apply when measuring the resistance and temperature with the
SM 431; AI 8 x 14 Bit:
Table 5- 56 Channels for resistance measurement of the SM 431; AI 8 x 14 Bit (6ES7431-1KF10-0AB0)
Measuring type parameter Permissible for
channel n
Condition
Resistance
(4-conductor connection)
0, 2, 4 or 6 You must disable the "Measuring type" parameter for channels
n+1 (1, 3, 5, 7).
Reason: The connections of channel n+1 are used to supply the
resistance that is connected to channel n.
Unused channels
Unused channels can be left open. Set the measuring range modules to position "B". You
can improve the noise immunity of the module in a measuring environment with serious
interference by interconnecting M- and M
ANA
.
Measuring ranges
Set the measuring ranges using the measuring range modules, and at the "measuring
method" parameter in
STEP 7
.
Table 5- 57 Measuring ranges of the SM 431; AI 8 x 14 Bit (6ES7431-1KF10-0AB0)
Selected measuring
method
Measuring range
(type of sensor)
Measuring range module
settings
Description
± 1 V A V: Voltage
1 to 5 V
± 10 V
B
The digitized analog values are
listed in the section "Representation
of analog values for analog input
channels" in the voltage measuring
range.
2DMU: Current
(2-wire transducer)
4 to 20 mA D To supply these transducers with
current you must connect 24 V to
the L+ and M front connector
terminals.
The digitized analog values are
listed in the section "Representation
of analog values for analog input
channels" in the current measuring
range.
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