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SIAi-8 8 Channel Analogue Signal Input to RS-485 Modbus RTU Interface Converter

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SIAi-8 8 Channel Analogue Signal Input to RS-485 Modbus RTU Interface Converter
8 channel analogue signal to digital interface module for converting voltage or current signal inputs to a single RS-485 communication interface using Modbus RTU transmission protocol. The voltage version will accept 0-10Vdc, 2-10Vdc, 0-5Vdc or 1-5Vdc input, and the current version will accept a 0-20mA or 4-20mA input.

Contents

  • Product Parameters
  • Product Description
  • Product Versions
    • Voltage Inputs
    • Current Inputs
  • Connection and Operation
  • Connection Terminals
  • Related Documents
    • Specification data sheet

Product Parameters

  • Power supply voltage: 24V DC typically
  • Maximum supply voltage fluctuations: from +16V DC to +30V DC
  • Current consumption: 55 mA typically
  • Number of independent analogue inputs: 8
  • Inputs (depending on version):
  • SIAi-8P: current 0-20 mA; 4-20 mA
  • SIAi-8N: voltage 0-10 V; 2-10 V; 0-5 V; 1-5 V
  • Measurement accuracy: ± 0.25% ± one digit
  • Accepted prolonged inputs overload: 20%
  • Galvanic separation: all 8 inputs are galvanically isolated from module supply
  • and RS-485 interface
  • Communication interface: RS-485
  • Transmission protocol: Modbus RTU
  • Baud rate: 1200 ÷ 115200 bit/sec.
  • Number of modules in a single network: max. 128
  • Data memory: non-volatile memory, EEPROM type
  • Operating temperature: 0°C ÷ +50°C
  • Storage temperature: -10°C ÷ +70°C (standard),
  • Humidity: max. 90%, non-condensing
  • Protection class: IP 20 (housing and connection clips)
  • Installation method: on the 35 mm strip
  • Case dimensions: 101 x 22,5 x 80 mm

Product Description

Module SIAi-8 allows to measure analog values from 8 current or voltage inputs via the RS-485 connection, with speed rate about 10 Hz (every channel).

Measurement results can be internally recalculated due to one of the available characteristics: linear, square or user definable multipoint (max. 20 points length). The SIAi-8 module is typically used in distributed control and visualization systems. Standard Modbus transmission functions are included in the SIAi-8 for changing device address or detecting type.

All SIAi-8 operating functions, available via the RS-485, can be implemented from any typical visualization software, or for instance with a suitable MultiCon CMC controller.

Product Versions

Voltage Inputs

  • SKU ID: s1-siai8-0001
  • Part No: SIAi-8N-001
  • Input: voltage 0-10 V, 2-10 V, 0-5 V, 1-5 V
  • Number of Inputs: 8
  • Communication Interface: RS-485
  • Transmission Protocol: Modbus RTU
  • Operating Temperature: 0 to +50degC
  • Power Supply: 24Vdc

Current Inputs

  • SKU ID: s1-siai8-0002
  • Part No: SIAi-8P-001
  • Input: current 0-20 mA, 4-20 mA
  • Number of Inputs: 8
  • Communication Interface: RS-485
  • Transmission Protocol: Modbus RTU
  • Operating Temperature: 0 to +50degC
  • Power Supply: 24Vdc

Connection and Operation

Connect the supply voltage to the module (+Uz, -Uz, typically 24V DC) and two wires RS-485 (A+, B-) communication interface.

Module inputs are located on the lower edge of the case (look: bottom view). Directly after power on the device is signalling its normal operation flashing green LED, marked “RUN” (about 2 times/sec.).

Short flashes of LED marked “TX/ERROR” signalize activity of RS-485 interface, and permanent light of this LED means malfunction of the device. Module makes the measurements from eight inputs in cycles.

Connection Terminals

SIAi-8 connection terminals

Related Documents

Specification data sheet

  • SIAi-8 product data sheet

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