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  • New item   -53.98€Digital input/output module | Modbus RTU | 4DI + 4DO 5VDC | 24VDC PoM | DIN rail | IP30 | Sentera Controls | DIO-M-D4
    New item   -53.98€Digital input/output module | Modbus RTU | 4DI + 4DO 5VDC | 24VDC PoM | DIN rail | IP30 | Sentera Controls | DIO-M-D4 1
    New item   -53.98€Digital input/output module | Modbus RTU | 4DI + 4DO 5VDC | 24VDC PoM | DIN rail | IP30 | Sentera Controls | DIO-M-D4 2
    New item   -53.98€Digital input/output module | Modbus RTU | 4DI + 4DO 5VDC | 24VDC PoM | DIN rail | IP30 | Sentera Controls | DIO-M-D4 3
    New item   -53.98€Digital input/output module | Modbus RTU | 4DI + 4DO 5VDC | 24VDC PoM | DIN rail | IP30 | Sentera Controls | DIO-M-D4 4

    Digital input/output module | Modbus RTU | 4DI + 4DO 5VDC | 24VDC PoM | DIN rail | IP30 | Sentera Controls | DIO-M-D4

    Code: DIO-M-D4
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  • Product description

    Digital input/output module | Modbus RTU | 4DI + 4DO 5VDC | 24VDC PoM | DIN rail | IP30 | Sentera Controls | DIO-M-D4

    DIO-M-D4 – a Sentera Controls DIN rail digital input / output module for a Modbus RTU network: 4 digital inputs with tacho function and 4 digital 5 VDC outputs. It allows devices without Modbus to be connected to the Sentera Modbus network.

    Key idea:
    The module reads contacts, PWM and tacho signals and controls 5 VDC logic outputs – convenient when signalling or logic commands are needed for other equipment.
    Inputs
    4 DI (0–45 VDC), tacho and PWM
    Outputs
    4 DO, 5 VDC
    Power supply
    24 VDC PoM
    Installation / protection
    DIN rail, IP30

    Operating principle

    The module is mounted on a 35 mm DIN rail and plugged into the Modbus RTU line via an RJ45 connector (1–2 +24 VDC, 3–4 A, 5–6 /B, 7–8 GND), through which it also receives 24 VDC power (Power over Modbus). Contacts or signals are connected to inputs DI1–DI4, and the controlled devices to the outputs.

    The digital inputs operate in the 0–45 VDC range (logic level 1.6 VDC, 100 kΩ), a 5 VDC output is provided for activating dry contacts, the tacho function measures 0–1000 Hz (0–60 000 rpm), and PWM measurement is 0–100 % at 1–1000 Hz. The four outputs DO1–DO4 are 5 VDC level, short-circuit protected; their load counts toward the total 5 VDC limit (≤100 mA).

    Result – input states and measurements become Modbus registers, and registers become output states, so non-Modbus equipment is integrated into a Sentera or BMS system. Configured with the 3SModbus software or Sensistant, the firmware is updated via Modbus RTU (bootloader); the LED in the RJ45 socket shows power and communication.

    Benefits DIO-M-D4?
    Non-Modbus equipment – contacts, signalling and logic signals – is connected to the Modbus system without an additional PLC.

    Technical specifications

    Product type Digital I/O module Modbus RTU
    Manufacturer / code Sentera Controls / DIO-M-D4
    Series DIO-M-D4 / DIO-M-R2
    Power supply 24 VDC via Modbus (PoM), RJ45
    Digital inputs 4 (DI1–DI4), 0–45 VDC, logic level 1.6 VDC, 100 kΩ
    Tacho function 0–1000 Hz (0–60 000 rpm)
    PWM measurement 0–100 %, 1–1000 Hz
    Digital outputs 4 (DO1–DO4), 5 VDC, short-circuit protection
    5 VDC output ≤100 mA in total with the digital outputs (for dry contacts)
    Communication Modbus RTU (RS485), RJ45: 1–2 +24 VDC, 3–4 A, 5–6 /B, 7–8 GND
    Configuration 3SModbus, Sensistant; update via Modbus RTU (bootloader)
    Indication LED on the RJ45 socket: power and Modbus communication
    Installation 35 mm DIN rail, bottom latch
    Housing ABS, grey RAL 7035
    Protection class IP30 (EN 60529)
    Operating environment -10…+60 °C, 5–85 % rH non-condensing
    Weight 0.072 kg net
    Compliance LVD 2014/35/EU, EMC 2014/30/EU (EN 61000-6-1, -6-2, -6-3), WEEE, RoHS

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

    Original manufacturer documentation – technical data, wiring diagrams and installation instructions.

    Main functions

    • 4 digital inputs – states of contacts, alarms and door switches – to Modbus.
    • Tacho measurement – fan speed monitoring 0–60 000 rpm.
    • PWM measurement – 0–100 %, 1–1000 Hz signal reading.
    • 4 digital outputs 5 VDC – logic signals for other equipment or indication, short-circuit protection.
    • 5 VDC for dry contacts – no additional power supply is needed for input contacts.
    • Power over Modbus – 24 VDC and data over a single cable.
    • Update via Modbus RTU – the firmware is updated over the network (bootloader), configuration – 3SModbus or Sensistant.

    Where is it used?

    • Connecting non-Modbus equipment to a Sentera Modbus network
    • Fan speed (tacho) monitoring
    • Reading fire alarm, door and alarm contacts
    • Transmission of logic signals to other equipment
    • PWM signals monitoring
    • Controlling the logic inputs or indication of other controllers with a 5 VDC signal
    • Tacho and PWM feedback signal monitoring of EC fans across several units

    On-demand operation

    For the electronic equipment integrator.
    Four short-circuit-protected 5 VDC logic outputs control the inputs of other controllers.
    For the EC fan system commissioning engineer.
    Tacho and PWM (1–1000 Hz) measurement shows actual fan operation.
    For panel builders.
    Compact 0.072 kg DIN module with no separate power supply.

    Practical application

    If you need to monitor the tacho signal of two EC fans and the duty cycle of two more PWM signals (0–100 %, 1–1000 Hz), then the DIO-M-D4 provides all four inputs in Modbus registers and, via outputs DO1–DO4, passes 5 VDC logic signals to other equipment, without exceeding the common 100 mA limit.

    Application guide: how it is used in practice

    The DIO-M-D4 connects non-Modbus equipment to the Modbus network – only the connected signals change:

    Site What is connected Result Installer's note
    Air handling unit Fan tacho output → DI1 Speed (rpm) is visible to the BMS, a stoppage can be detected Tacho up to 1000 Hz
    Fire alarm / emergency stop Dry contact → DI2 + 5 VDC Contact status is transmitted via Modbus Use 5 VDC for dry contacts only
    Indication / signalling 5 VDC LED or logic input → DO1–DO4 Status is shown locally or passed on to other equipment Total 5 VDC load ≤100 mA
    PWM signal monitoring PWM source → DI3 PWM duty cycle (%) – in a Modbus register Frequency 1–1000 Hz

    How to choose an I/O module

    Required inputs / outputs Recommended model
    4 digital inputs + 4 digital outputs (5 VDC) DIO-M-D4 (4 DI + 4 DO, PWM measurement) ← this model
    4 digital inputs + 2 changeover relays DIO-M-R2 (4 DI + 2 C/O relays 2 A)
    Rule: if you need to switch a load directly (pump, damper, heater contactor) – DIO-M-R2 with relays; if 5 VDC logic signals are enough and you need more outputs and PWM measurement – DIO-M-D4.
    When to choose another solution: for analog signals – DADCM-08 / DADCM-44 (inputs) and DDACM-03 / DDACM-I3 / MDACM1 (outputs).

    Pros

    • 4 digital inputs with tacho
    • Power over Modbus (PoM)
    • 5 VDC for dry contacts
    • Update via Modbus RTU
    • DIN rail
    • 4 digital outputs
    • PWM measurement

    Cons / limitations

    • IP30 – in a panel / indoors only
    • No analog inputs / outputs – use DADCM-08 / DDACM-03 for that
    • Outputs are 5 VDC logic only – to switch a load choose the DIO-M-R2
    • 5 VDC total limit 100 mA

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified electrician or automation specialist with the power disconnected.
    • Use the 5 VDC output for dry contacts only; total 5 VDC load ≤100 mA.
    • Do not exceed the power of the Power over Modbus (PoM) supply – add up the currents of all devices powered on the line.
    • Use at -10…+60 °C, 5–85 % rH, non-condensing.

    Quick selection guide

    Modbus RTU
    4 DI
    4 DO 5 VDC
    24 VDC PoM
    DIN
    IP30
    Suitable when you need:
    • to connect non-Modbus equipment to the Sentera Modbus network;
    • to read contacts and the fan tacho signal;
    • to pass 5 VDC logic signals to other equipment.
    Check before use:
    • how many and what kind of signals are needed;
    • the output load (relays up to 2 A) – the DIO-M-D4 has only 5 VDC logic outputs;
    • the reserve of the PoM power supply.
    Important reminder: The DIO-M-D4 is not an analog module – for 0-10 VDC signals choose the DADCM / DDACM series.

    FAQ

    Can fan speed be measured?
    Yes, the tacho function measures 0–1000 Hz (0–60 000 rpm).
    Is a separate supply required?
    No, 24 VDC is supplied over Modbus (PoM) via the RJ45 connector.
    Can a 230 VAC load be switched directly?
    No, the DIO-M-D4 outputs are 5 VDC logic, so to switch a load choose DIO-M-R2.
    Which PWM signals can be measured?
    The module measures PWM duty cycle 0–100 % at a frequency of 1–1000 Hz.
    Are the outputs short-circuit protected?
    Yes, DO1–DO4 are short-circuit protected, and the total 5 VDC load must not exceed 100 mA.
    What is the difference between DIO-M-D4 and DIO-M-R2?
    The DIO-M-D4 has four 5 VDC outputs and PWM measurement, while the DIO-M-R2 has two switching relays and a standalone mode.

    Digital input/output module | Modbus RTU | 4DI + 4DO 5VDC | 24VDC PoM | DIN rail | IP30 | Sentera Controls | DIO-M-D4

    Sentera DIO-M-D4 – a Modbus RTU digital I/O module: 4 DI with tacho, 4 DO 5 VDC, PWM measurement, 24 VDC PoM, DIN rail, IP30 – for integrating non-Modbus equipment.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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