Analog modules
6.10 Analog input module SM 331; AI 8 x TC; (6ES7331-7PF11-0AB0)
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
6-93
Technical data
Temperature compensation
• Internal temperature compensation
• External temperature compensation with Pt 100 (0.003850)
• Compensation for 0 °C reference junction temperature
• Compensation for 50 °C reference junction temperature
• Technical unit of temperature measurements
programmable
supported
supported
supported
supported
Degrees Centigrade / degrees Fahrenheit
Wiring signal transducers with 40-pin front connector
** Wire-break monitoring in 4-channel mode (hardware filter) at intervals of three seconds.
** In 8-channel software mode (software filter), series-mode rejection is reduced as follows:
50 Hz > 70 dB
60 Hz > 70 dB
400 Hz > 80 dB
*** The operational limit comprises only the basic error of the analog input at Ta = 25 °C and
the total temperature error. The total error must include the error or the compensation of the
cold reference junction. Internal compensation of reference junction = max. 1.5 °C
External compensation of reference junction = precision of external RTD employed ± 0.1 °C.
External compensation of reference junction which maintains the reference junction at 0 °C
or 50 °C = accuracy of temperature control for the reference junction.
**** Because of the slight rise over the range of approx. 0 °C to 85 °C, the lack of
compensation of the reference junction temperature only has a negligible effect on a type B
thermocouple. If there is no compensation, and the measuring method "Compensation to 0
°C" is set, the deviation at the type B thermocouple during temperature measurement is: 200
°C to 1802 °C < 0.5 °C
***** In 4-channel mode, the converted value tunes to 100 % within 80 ms. The value
established in this process is set every type. 3.3 ms (max. 10 ms).
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