IOMod 8AI – industrial 8 analog inputs module


IOMod 8AI is a stand-alone Modbus RTU, IEC60870-5-103 and IEC60870-5-101 8 analog input device. Designed to measure voltage or current values with high accuracy in real-time. IOMod 8AI can be used for numerous applications where user needs to log Voltage or Current changes. IOMod 8AI can be used to measure temperature, pressure, water level or weight with corresponding sensors (e.g. 4-20mA). IOMod 8AI input measurement resolution, data scaling and data casting can be configured by user for each channel individually.

IOMod 8AI is an ideal solution for such applications as data acquisition, observation, control, process monitoring, testing and measurement remotely. It is controlled over Modbus, IEC60870-5-101 or IEC 60870-5-103 protocol, and can be connected in parallel with other Modbus, IEC60870-5-101 or IEC 60870-5-103 equipment in a multi-drop installation scheme such as any SCADA system.

When using IOMod 8AI with WCC Lite gateway, it is possible to monitor voltage or current values for each individual input over Ethernet LAN’s or 3G/4G(LTE)/GSM/GPRS networks. It is a powerful solution for remote monitoring and control, alarm management and data logging of I/Os on cloud platform.


  • Data measurement in 16-bit resolution
  • Fully configurable data scaling and casting
  • Selectable input sensitivity
  • Configuration over USB console
  • Drag and Drop firmware upgrade over USB mass storage
  • Modbus RTU, IEC 60870-5-101 and IEC-60870-5-103 communication over RS485
  • Software selectable 120Ω termination resistor for RS485
  • LED indication for data transmission
  • Easy connection with WCC Lite gateway and platform


  • Analog inputs: 8
  • PC USB connection: Mini USB
  • Input connectors: Screw terminal plug connector


  • Configuration: Over USB console
  • Firmware upgrade: Over USB mass storage


  • Communication standard: RS485
  • Communication protocol: Modbus (RTU), IEC 60870-5-101, and IEC 60870-5-103
  • Speed: 600 – 115200 baud

Electrical characteristics

  • Termination resistor: Software selectable, 120Ω
  • Power supply: 9-33VDC (full range)
  • Current consumption: 40mA @ 12VDC, 20mA @ 24VDC
  • Inputs: 16-bit resolution
  • Channel-independent programmable inputs


Device data
Article numberIOMOD-8AI
Product Description8 channel 16 bit analog input module
Configuration softwareIOMOD Utility, Serial console (putty)*
Warranty2 years
Measurement values and functions
Analog inputs8 configurable analog inputs
Inputs resolution16 bit
Channel-independent programmable input typesVoltage and current inputs
Voltage input rangesBipolar: +-10.24V, +-5.12V, +-2.56V
Unipolar: 10.24V, 5.12V
Current input rangesBipolar: +-51.2mA, +-25.6mA, +-12.8mA
Unipolar: 51.2mA, 25.6mA
Overvoltage protection +-20V
Interface and communication
RS485 interfaceANSI/TIA/EIA-485-A-1998
Communication protocols– Modbus RTU Slave;
– IEC 60870-5-101 Slave;
– IEC 60870-5-103 Slave.
Baudrate600 – 115200 baud
ParityNone, Even, Odd
Terminating resistors120 Ohm (configurable)
USB interface2.0
TypeMini USB
UseConfiguration/Firmware upgrade
Power supply
Auxiliary power supply9-33VDC (full range)
Power consumption40mA @ 12VDC, 20mA @ 24 VDC
Insulation voltage3 kV
Operating conditions
Operating temperature-40°C … 85°C
Storage temperature-40°C … 85°C
Relative humiditymax. 95 % (non condensing)
Protection classIP20
Dimensions and installation instructions
Case height x width x depth119 x 17.5 x 101 mm
Installation typeDIN Rail mounting
* IOMOD Utility is configuration tool for IOMOD devices with firmware v2.x, for devices with fw v1.x configuration can be done via USB port as Serial console interface like Putty.



IOMOD-8AI – 8x analog input module with IEC 60870-5-103, IEC 60870-5-101, or Modbus RTU Slave protocol

On request*:

* – IOMOD devices 8DI8DO, 8AI, 4RTD, 16DI, 8DI4RO, HT with firmware versions v1.x supports only 1 protocol. To change protocol is required to change firmware. All types of firmware are accessible to all customers without any additional payment.

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