DIN rail I/O Modbus slave with 4 analog input/output channels

  • I/O interface – remotable on RS485 fieldbus
  • 4 analog input/output channels, 12 bits, isolated
  • 10V / 20 mA configurable input and output
  • Indipendent V / I selection for input and output
  • Channels configurable separately from each other
  • Input and output with high speed conversion
  • I/O protected from voltage and current over-load
  • 12 bits channel with internal temperature sensor
  • RS485 serial port with high speed (1Mb/s max)
  • Modbus RTU protocol, configurable over RS485
  • CoDeSys libraries for configuration and use
  • PC tool for configuring and testing modules
  • Compact dimension on 17.5mm of DIN rail
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CODE: 099-8104 Category: Modbus compact I/O modules


Interface module with 4 analog input/output channels configurable for 10V and 20mA. Each channel can simultaneously measure and generate both 10V voltages that 20mA currents. The measurement of the voltage or current of a channel can be used as control of analog output but also as an independent analog input. The analog output can be used as power source for the analog sensor connected to the input.
Both input and output of the channels have a resolution of 12bits and particularly low response times.
Easy integration in the “PLC Configuration” of CoDeSys tool in conjunction with the compact Web PLCs.
Ultra compact (only 17.5mm wide) realization with DIN rail mounting.

Technical Specification

Analog channels  4 single-ended input and output channels
 Isolation  1500Vac max (from bus and power supply)
Voltage input  0-10V, 12 bits, impedance > 100kΩ
Current input  0-20mA, 12 bits, 50Ω shunt resistor
 Inputs speed  Programmable filter from 10ms to 1s
 Inputs reading  +20% nominal value (word = 4914)
Inputs protection  ±80V max (10V input), ±26V max (20mA input)
 Voltage output  0-10V, 12 bits, min load 1kΩ (short-cir. 24mA)
Current output  0-20mA, 12 bits, max load 600Ω (@ 4x20mA)
 Outputs speed  15ms (99% of final value)
 Outputs driving  +10% nominal value, 14.5V max on mA output
Output protection  +26V max applied on 10V and 20mA outputs
 In/Out accuracy  Precision: ±0.05% FS. Linearity: ±0.025% FS
Thermal drift  50 ppm/°C
 Temperature sensor  Internal NTC -20°C ÷ 80°C, res. 0.1°C, ±0.5°C
 Fieldbus  RS485 with EMI filter, thermal prot. / ESD 15kV
 Max nodes / Termin.  64 / insertable 120Ω load
 Baudrate  300b/s ÷ 1Mb/s (continuosly prog.)
 Protocol  Modbus RTU, address 1 ÷ 247, parity N/O/E
 Function codes  3, 4, 6, 16, 17, 23, 100, 101, 102, 109, 110
Max performance  Complete I/O update within 600μs (@ 1Mb/s)
 Power supply  24Vdc ±15% / 80mA ÷ 160mA max (@ 4x20mA)
Operative temp. -20°C to 70°C
Connections Plug-in screw terminals 28÷12AWG / 2.5mm2
Box  ABS with 35mm DIN rail mount / IP20
 Max dimensions  113 x 17.5 x 119 mm (H x W x D)


EX04AIO brochure
Modules configuration manual
Modbus-Tool for configuration and test