How do you connect a sensor to the analog signal modules of SIMATIC S7-1200?
A field sensor with the properties below can be connected to the analog input signal modules of S7-1200:
- Measuring transducer with voltage output: +/-10 V, +/-5 V or +/-2.5 V or
- 2-wire measuring transducer: 4-20 mA
The type of measurement (voltage or current) can be selected via 2 channels in each case.
The figures below show examples of how to connect different sensor types (voltage power supply: 24 V DC) to the analog signal module SM 1231 AI 4 x 13 Bit (channel 0):
Fig. 1: Potential-free voltage sensor (4-wire connection)
Fig. 2: Non-isolated voltage sensor with ground connection (3-wire connection)
Fig. 3: Current measurement via a 2-wire measuring transducer
- When using a 4-20mA sensor, the measured value must be converted accordingly.
Entry ID 39334504
- Further information is available in the system manual for SIMATIC S7-1200. Entry ID: 36932465
2-wire, 3-wire, 4-wire