Siemens S7-400PLC Spécifications Page 255

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Analog modules
5.19 Analog input module SM 431; AI 8 x 13 Bit (6ES7431-1KF00-0AB0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
255
5.19.3 Measuring methods and measuring ranges of SM 431; AI 8 x 13 Bit
Measuring methods
You can set the measuring method at the input channels:
Voltage measurement
Current measurement
Resistance measurement
You perform the setting with the "measuring method" parameter in STEP 7.
Circuit for resistance measurement
The following conditions apply when measuring the resistance with the SM 431; AI 8 x 13
Bit:
Table 5- 46 Channels for resistance measurement of the SM 431; AI 8 x 13 Bit
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. You can improve the noise immunity of the module in a
measuring environment with serious interference by short-circuiting the channels and
connecting to M
ANA
. For unused channels, set the "measuring method" parameter to
"deactivated". This reduces the module's cycle time.
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