Siemens S7-400PLC Especificações Página 307

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Analog modules
5.23 Analog input module SM 431; AI 16 x 16 Bit (6ES7431-7QH00-0AB0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
307
Circuit for resistance and temperature measurement
The following conditions apply when measuring the resistance and temperature with the
SM 431; AI 16 x 16 Bit:
Table 5- 64 Channels for resistance and temperature measurement of the SM 431; AI 16 x 16 Bit
Measuring type parameter Permissible for
channel n
Condition
Resistance
(4-conductor connection)
0, 2, 4, 6, 8, 10, 12
or 14
Resistance
(3-conductor connection)
0, 2, 4, 6, 8, 10, 12
or 14
Thermal resistance
(linear, 4-wire connection)
0, 2, 4, 6, 8, 10, 12
or 14
Thermal resistance
(linear, 3-wire connection)
0, 2, 4, 6, 8, 10, 12
or 14
You must disable the "Measuring type" parameter for channels
n+1 (1, 3, 5, 7, 9, 11, 13, 15).
Reason: The connections of channel n+1 are used to supply
the resistance that is connected to channel n.
Thermocouple (linear) 0 to 15 You can select the reference junction. It is only advisable to
specify a reference junction with thermocouples.
Circuit for reference junction compensation for thermocouples
If you select "RTD on Channel 0" as a reference junction for reference junction
compensation for thermocouples, the following applies:
Table 5- 65 Reference junction compensation via RTD on channel 0 of the SM 431; AI 16 x 16 Bit
Reference junction parameters Permissible for
channel n
Condition
RTD on Channel 0 2 to 15 You must connect and configure on channel 0 a resistance
thermometer with linearization, a 3- or 4-conductor
connection in climatic range. This means that channels 0
and 1 are assigned.
Reason: If channel 0 is to be used as the reference junction,
a resistance-type sensor must be connected there to record
absolute temperatures in the climatic range.
Unused channels
Unused channels can be left open. Set the measuring range modules to position "A". You
can improve the noise immunity of the module in a measuring environment with serious
interference by short-circuiting the channels.
For unused channels, set the "measuring method" parameter to "deactivated". This reduces
the module's cycle time.
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