Range card selection for analog modules of Siemens S7-300PLC - Database & Sql Blog Articles

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Q: In the hardware configuration, when selecting the analog module for measurement, I see options like E, 4DMU, 2DMU, and I understand how to use them. But I'm not sure about R-4L, RT, TC-I, TC-E, TC-IL, TC-EL. What do these terms mean? How should they be used? I know the meaning of each word in English, but I’m still confused about the overall description. Thank you for your help.

Question added: There is also an address for the analog output module, such as AO4x12Bit. The addresses of this module are from 512 to 519. Which points belong to 512, which to 513, and so on? Also, which of these points are connected to the power supply? Thank you.

A: Here's a breakdown of the terms:

  • E: Voltage input
  • 4DMU: 4-wire current sensor
  • 2DMU: 2-wire current sensor
  • R-4L: 4-wire resistor terminal
  • RT: Resistance (thermal, linear)
  • TC-I: Thermocouple with internal compensation
  • TC-E: Thermocouple with external compensation
  • TC-IL: Linear thermocouple with internal compensation
  • TC-EL: Linear thermocouple with external compensation

Regarding the wiring:

  • Terminal 1 is connected to L+24V+
  • Terminal 20 is connected to M0V
  • Terminals 34 are connected together and correspond to PQW512 — this is used without line resistance compensation.
  • Terminals 56 are connected together and represent the negative side.
  • Terminals 34 receive the positive signal from the field and correspond to PQW512 with line resistance compensation.
  • Terminals 45 receive the negative signal from the field.

Other analog channels:

  • Terminals 7-8-9-10 correspond to PQW514
  • Terminals 11-12-13-14 correspond to PQW516
  • Terminals 15-16-17-18 correspond to PQW518

This setup helps in accurately reading signals from different types of sensors and resistors while managing line resistance compensation where necessary. If you have more questions or need further clarification, feel free to ask!

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