SM 1231 AI 6ES7231 has the features as:
Using the analogue input module SM 1231 AI – 6ES7231-4HD32-0XB0 from Siemens your SIMATIC S7-1200 controller can be expanded by 4 analogue inputs. The analogue input SM 1231 AI – 6ES7231-4HD32-0XB0 processes signals with /- 10 V, /- 5 V, /- 2.5 V or 0 (4) to 20 mA, at a resolution of 12 bits sign bit (13 bits ADC).
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