
Analog modules
5.23 Analog input module SM 431; AI 16 x 16 Bit (6ES7431-7QH00-0AB0)
S7-400 Automation System Module Data
310 Reference Manual, Edition 09/2009, A5E00850736-06
Checking for reference channel errors when connecting thermocouples
If you have connected a thermocouple, you can then enable the "Reference channel error"
diagnostics if you have configured an "RTD on Channel 0" or "Reference Temperature
Value" reference junction.
Points to note about checking for "Underflow" with some measuring methods and measuring ranges
There is now underflow in life-zero areas. A value that is too low or is negative is interpreted
as a wire break. You can therefore not configure the underflow check for the SM 431;
AI 16 x 16 Bit for the following measuring methods and ranges:
Table 5- 67 Points to note when checking for "Underflow"
Measuring method Measuring range
Voltage 1 to 5 V
Current (4-wire sensor) 4 to 20 mA
Current (2-wire sensor) 4 to 20 mA
Points to note about the "Short-circuit to M" diagnostics
You can only configure the check for "Short-circuit to M" for the SM 431; AI 16 x 16 Bit for
the "Current (2-wire transducer)" measuring method.
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