Siemens SIMATIC S7 System Manual page 742

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553BTechnical specifications

A.9 Analog signal boards (SBs)

The module reports 32767 on any activated channel with no sensor connected. If open wire

detection is also enabled, the module flashes the appropriate red LEDs.

When 500 Ω and 1000 Ω RTD ranges are used with other lower value resistors, the error

may increase to two times the specified error.

Best accuracy will be achieved for the 10 Ω RTD ranges if 4 wire connections are used.

The resistance of the connection wires in 2 wire mode will cause an error in the sensor

reading and therefore accuracy is not guaranteed.

Table A- 147 Noise reduction and update times for the RTD modules

Rejection frequency

400 Hz (2.5 ms)

60 Hz (16.6 ms)

50 Hz (20 ms)

10 Hz (100 ms)

To maintain module resolution and accuracy when the 400 Hz filter is selected, the integration time is 10 ms. This

selection also rejects 100 Hz and 200 Hz noise.

After power is applied, the module performs internal calibration for the analog-to-digital

converter. During this time the module reports a value of 32767 on each channel until valid

data is available on that channel. Your user program may need to allow for this initialization

time. Because the configuration of the module can vary the length of the initialization time,

you should verify the behavior or the module in your configuration. If required, you can

include logic in your user program to accommodate the initialization time of the module.

Integration time

4-/2-wire, 1-channel module

Update time (seconds)

3-wire, 1-channel module

Update time (seconds)

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

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Simatic s7-1200