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SIAi-8 8x Analogue input to RS485 Modbus converter module

Introducing the SIAi-8 Analog Inputs Module: Expand your control and visualisation capabilities with this versatile device. With RS-485 connectivity, the module enables the measurement of analogue values from 8 current or voltage inputs at a rapid rate of approximately 10 Hz per channel. The module offers flexible recalibration options, including linear, square, or user-defined multipoint characteristics (up to 20 points). Galvanic separation ensures safety, while LED indicators provide clear operation and Modbus transmission feedback. Seamlessly integrate the SIAi-8 with various visualisation software or MultiCon controllers for effortless implementation. Experience precise and reliable analogue input readings with our cutting-edge module.

SIAi Converter Module Product Parameters

  • Output Signal: Communication via RS-485, Modbus RTU.
  • Accuracy: ± 0.25% ± one digit.
  • Electrical Connections: Power supply range from 10V to 30V DC, with an external T-type fuse (max. 1 A).
  • Process Connections: 8 independent analogue inputs (current 0-20 mA, 4-20 mA; voltage 0-10 V, 2-10 V, 0-5 V, 1-5 V).
  • Special Features: Galvanic separation of all inputs from power supply and interface.

Product Highlights

The SIAi8 module is a versatile device that enables the measurement of analogue values from 8 current or voltage inputs using the RS-485 connection. With a speed rate of approximately 10 Hz for each channel, it provides accurate and real-time measurement results. The module offers various options for recalculating measurement data, including linear, square, or user-defined multipoint characteristics with a maximum length of 20 points. This flexibility allows for precise and customisable data processing. The SIAi8 module is particularly useful in distributed control and visualisation systems, where it can be seamlessly integrated. It supports standard Modbus transmission functions, allowing for easy configuration such as changing device addresses or detecting device types. Additionally, the module’s operating functions can be accessed and controlled remotely via the RS-485 connection using typical visualisation software or compatible MultiCon controllers, making it a convenient and user-friendly solution for various applications.


  • Analogue inputs module
  • 8 independent analogue inputs (voltage or current)
  • RS-485 / Modbus RTU
  • Galvanic separation of the inputs from the module supply voltages
  • LEDs for module operation and Modbus transmission signalling
  • Input signals connected by means of the socket-plug connectors

To download the latest datasheet click here: SIAi 8

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