4.21Analog Input Module SM 331; AI 8  12 bits;
(6ES7 331-7KF02-0AB0)
Order number
6ES7 331-7KF02-0AB0
Characteristics
The analog input module SM 331; AI 8  12 bits has the following characteristic
features:
S8 inputs in 4 channel groups
S Measured-value resolution; settable per group (depending on the integration time set)
–9 bits + sign
–12 bits + sign
–14 bits + sign
S Measuring method selectable per channel group:
–Voltage
–Current
–Resistors
–Temperature
S Arbitrary measuring range selection per channel group
S Programmable diagnostics
S Programmable diagnostic interrupt
S Two channels with limit monitoring
S Programmable hardware interrupt when limit has been exceeded
S Isolated against the backplane bus interface
S Isolated against load voltage (except when at least one
coding key is inserted in position D)
Resolution
The resolution of the measured value is a direct function of the integration time
selected. In other words the longer the integration time for an analog input channel,
the more accurate the resolution of the measured value will be (see Technical
Specifications of the module and T able 4-6 on page 4-11).reference group
Terminal connection diagram and block diagram of the SM 331; AI 8 12 bits
Figure 4-38Module View and Block Diagram of the Analog Input Module SM 331; AI 8  12 bits The in
put resistances depend on the measuring range selected (see Technical
Specifications).
Technical specifications of the SM 331; AI 8 12 bits
4.21.1Commissioning the SM 331; AI 8 12 bits
You set the mode of operation of the SM 331; AI 8  12 bits by means of
measuring range modules on the module and in STEP 7.
Measuring range module
If necessary, the measuring range modules must be replugged to change the
measuring method and the measuring range. The steps you have to perform to do
this are described in detail in Section 4.4.
The corresponding table in Section 4.21.2 tells you which assignment you have to
select for which measuring method and measuring range. In addition, the
necessary settings are embossed on the module.
Default settings for measuring range module
The measuring range modules are preset to ”B” (voltage; " 10 V) when the
module is supplied.
To use the following preset measuring methods and measuring ranges, you only
have to change the measuring range module to the corresponding setting.
Parameter assignment in STEP 7 is not necessary.

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