DIN rail I/O Modbus slave with 4 analog inputs, 6 digital inputs and 4 digital outputs

  • I/O interfacce – remotable on RS485 fieldbus
  • 2 analog inputs, 12 bits, config. for 10V / 20mA
  • 2 analog inputs, 12 bits, config. for thermoresistances
  • 6 digital inputs, 24V PNP optoisolated (2 high speed)
  • 4 digital outputs, 24V / 2A PNP optoisolated
  • RS485 serial port with high speed (1Mb/s max)
  • Modbus RTU protocol, configurable over RS485
  • Security timer for comunication supervisory
  • CoDeSys libraries for configuration and use
  • PC tool for configuring and testing modules
  • Plastic support with DIN rail mounting
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CODE: 099-8151-1 Category: Modbus compact I/O modules


I/O interface with analog/digital inputs and digital outputs controlled via Modbus RTU over RS485 bus at high speed (up to 1Mb/s).
The digital I/O are galvanically isolated and equipped with LEDs for status signalling.
Two of the inputs are high speed type and also manage counting functions of the rising/falling edges and pulses of AB encoder.
The static outputs, designed with high-current MOSFET, are fully protected against permanent short-circuit, over-voltage and over-temperature.
Two of the analog inputs are individually configurable to read a voltage of 10V or a current of 20mA.
Two other analog inputs are individually configurable to read directly the temperature from standard resistive sensors such as 10kΩ NTC (linearised for five different curves), PT1000, KTY81 and KTY84.
Particularly suited for use with compact line Web PLCs through a configuration file and CoDeSys library for direct integration in the “PLC Configuration” of the programming tool.
Realisation on open board with support for DIN rail mounting.

Technical Specification

Analog channels 2 channels 10V / 20mA + 2 thermoresistances
Isolation 1500Vac max (from bus and power supply)
Resolution 12 bits
Voltage input 0-10V, impedance > 120kΩ
Current input 0-20mA, 100Ω shunt resistor
Thermoresistances 10kΩ NTC (5 curves), PT1000, KTY81-1/2, KTY84
Acquisition time Programmable filter from 10ms to 1s
10V/20mA reading Nominal 0-4095, Max +20% (word = 4914)
Temperature reading Signed integer value of tenths of a degree
Temp. resolution NTC: 0.1°C, PT1000: 0.5°C, KTY81-1: 0.2°C, KTY81-2: 0.1°C, KTY84: 0.2°C
Inputs protection ±80V max (10V), ±26V max (20mA and resist.)
Accuracy Precision: ±0.05% FS. Linearity: ±0.025% FS
Thermal drift 50 ppm/°C
Digital inputs 4 inputs (24V PNP) + 2 high speed inputs (12-24V)
Impedance / Vmin 6.6kΩ / 10V
Isolation / Vmax Optocoupled / 2000Vac
Filtering 0 ÷ 100ms (10ms step prog.)
High speed inputs 12KHz max frequency, individually isolated
Encoder counting 1 bidirectional AB with 32 bits, presettable
Edges counting 4 monodir. with 32 bits (A/B rising/falling edges)
Digital outputs 4 outputs (24V PNP)
Max current 2A for channel (8A total)
Power supply 20 ÷ 30Vdc
Isolation / Vmax Optocoupled / 2000Vac
Protection Short / Over-voltage / Thermal
Fieldbus RS485 (fully compliant to TIA/EIA-485A)
Max nodes / Termin. 64 / insertable 120Ω load
Baudrate 300b/s ÷ 1Mb/s (continuosly prog.)
Protocol Modbus RTU, address 1 ÷ 247, parity None/Odd/Even
Function codes 1, 2, 3, 4, 5, 6, 16, 17, 23, 100, 101, 102, 109, 110
Security timer 0 ÷ 600” (10ms step prog.)
Max performance Complete I/O update within 500μs (measured at 1Mb/s with OVERDIGIT master)
Power supply 24Vdc ±15% / 35mA max
Operative temp. -20°C to 70°C
Connections Screw terminals for 28÷12AWG / 2.5mm2 cables
Support ABS with 35mm DIN rail mount
Max dimensions 90 x 80 x 66 mm (H x W x D)


SX464AD brochure
Modules configuration manual
Modbus-Tool for configuration and test