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  • New item   -72.03€Power over Modbus power module with Modbus RTU repeater | 24VDC | 20W | 85-264VAC | RJ45 | DIN rail | IP20 | Sentera Controls | DPOM8-24-20
    New item   -72.03€Power over Modbus power module with Modbus RTU repeater | 24VDC | 20W | 85-264VAC | RJ45 | DIN rail | IP20 | Sentera Controls | DPOM8-24-20 1
    New item   -72.03€Power over Modbus power module with Modbus RTU repeater | 24VDC | 20W | 85-264VAC | RJ45 | DIN rail | IP20 | Sentera Controls | DPOM8-24-20 2
    New item   -72.03€Power over Modbus power module with Modbus RTU repeater | 24VDC | 20W | 85-264VAC | RJ45 | DIN rail | IP20 | Sentera Controls | DPOM8-24-20 3
    New item   -72.03€Power over Modbus power module with Modbus RTU repeater | 24VDC | 20W | 85-264VAC | RJ45 | DIN rail | IP20 | Sentera Controls | DPOM8-24-20 4

    Power over Modbus power module with Modbus RTU repeater | 24VDC | 20W | 85-264VAC | RJ45 | DIN rail | IP20 | Sentera Controls | DPOM8-24-20

    Code: DPOM8-24-20
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  • Product description

    Power over Modbus power module with Modbus RTU repeater | 24VDC | 20W | 85-264VAC | RJ45 | DIN rail | IP20 | Sentera Controls | DPOM8-24-20

    DPOM8-24-20 – a Sentera Controls DIN rail “Power over Modbus” (PoM) module: integrated 24 VDC / 20 W power supply and galvanically isolated Modbus RTU repeater. It allows Modbus transmitters and controllers to be powered and connected over a single UTP cable.

    Key idea:
    One module in the cabinet – and the Modbus line gets both 24 VDC power and an amplified, isolated signal. Sensors with RJ45 (e.g. DTS-M, DTP-M) are connected with a single cable, without separate power wires.
    Output
    24 VDC / 20 W (PoM)
    Communication
    Modbus RTU repeater, up to 115.2 kbps
    Input
    85–264 VAC, 50–60 Hz
    Installation
    DIN rail, IP20

    Operating principle

    The module is mounted on a DIN rail in the cabinet and powered from an 85–264 VAC mains supply. The connections are terminal blocks or RJ45 sockets; the terminals duplicate the corresponding RJ45 sockets, so either connection type can be used.

    An integrated source supplies 24 VDC / 20 W to the Modbus line (Power over Modbus), and a galvanically isolated half-duplex Modbus RTU repeater boosts the signal with automatic baud rate detection up to 115.2 kbps. The green LED indicates data transmission, and the red LEDs indicate overload or short circuit.

    Result – up to 32 devices and up to 1200 m of line, powered and connected by the same UTP cable. On long lines use the lowest possible transmission speed and add up the consumption of the PoM devices – the total power must not exceed 20 W.

    Benefits DPOM8-24-20?
    Power supply and an amplified, isolated Modbus signal in one DIN module – fewer cables and more reliable communication on long lines.

    Technical specifications

    Product type Power over Modbus power module with Modbus RTU repeater
    Manufacturer / code Sentera Controls / DPOM8-24-20
    Supply voltage 85–264 VAC, 50–60 Hz
    Output 24 VDC / 20 W (Power over Modbus)
    Communication Modbus RTU (RS485), galvanically isolated half-duplex repeater
    Baud rate Automatic detection, up to 115.2 kbps
    Number of devices / distance Up to 32 devices, up to 1200 m
    Connections Terminals (L, N, 24 VDC, GND, A, /B) and RJ45 sockets
    Protection Against overload and short circuit
    Indication Red LEDs – overload / short circuit; green LED – data transmission
    Housing ABS plastic, grey RAL7035
    Installation DIN rail
    Protection class IP20
    Operating environment -20…+40 °C, 5–85 % rH non-condensing
    Weight 0.175 kg (net)
    Compliance LVD 2014/35/EU, EMC 2014/30/EU, RoHS (EU) 2015/863

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

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

    Main functions

    • Power over Modbus – 24 VDC supply over the same UTP cable as the data.
    • Modbus RTU repeater – galvanically isolated, boosts the signal up to 1200 m.
    • Up to 32 devices – in a single boosted segment.
    • Automatic baud rate detection – up to 115.2 kbps without manual configuration.
    • RJ45 and terminals – choose the more convenient connection type.
    • Protection and LED indication – overload and short-circuit signalling.
    • Universal 85–264 VAC input – connects directly to the mains without a separate power supply.
    • 3SModbus – settings from a computer with the CNVT-USB-RS485-V2 converter and the 3SModbus program.

    Where is it used?

    • Sentera Modbus sensor (DTS-M, DTP-M) power supply and connection
    • Ventilation and heating automation cabinets
    • Long Modbus RTU lines (up to 1200 m)
    • BMS Modbus network segmentation
    • Sites with many Modbus devices
    • Galvanic isolation of the Modbus segment from the controller

    On-demand operation

    For the automation integrator.
    Isolated repeater and power supply in one – a more stable Modbus network.
    For installers.
    RJ45 connectors – transmitters are connected with a single UTP cable.
    For designers.
    Fewer cables and power supplies on site.

    Practical application

    If a ventilation unit has four DTS-M and two DTP-M transmitters (up to 0.192 W each), then the DPOM8-24-20 powers them all at 24 VDC over RJ45 via the same UTP cable and boosts the Modbus RTU signal for a line of up to 1200 m, staying well below 20 W.

    Application guide: how it is used in practice

    The DPOM8-24-20 becomes the power and communication node of the Modbus line:

    Site What is connected Result Installer's note
    Air handling unit with Modbus sensors DTS-M-080 / DTS-M-160 → RJ45 → DPOM8-24-20 Transmitters are powered and connected over a single UTP cable Total PoM power up to 20 W
    Heating system DTP-M on the pipes → DPOM8-24-20 → controller Pipe temperatures on the Modbus network A unique address for each device
    Long Modbus line DPOM8-24-20 as a repeater in the middle of the line The signal is amplified, line up to 1200 m Use the lowest possible speed
    BMS integration Controller / BMS ↔ DPOM8-24-20 ↔ devices Galvanically isolated segment Up to 32 devices

    How to choose a power supply

    Connected devices / power Recommended model
    24 VDC devices, up to 36 W DHDR8-24-36 (24 VDC, 36 W, 1.5 A)
    Modbus devices with PoM, 24 VDC up to 20 W + repeater DPOM8-24-20 (24 VDC, 20 W, PoM) ← this model
    24 VAC devices, up to 25 / 40 / 63 VA SATD1-24-25 / -40 / -63 (24 VAC)
    12 VAC devices, up to 25 / 40 / 63 VA SATD1-12-25 / -40 / -63 (12 VAC)
    Rule: the sum of the power of all devices powered over PoM must not exceed 20 W; no more than 32 devices and up to 1200 m on a line.
    When to choose another solution: for simple 24 VDC power without a repeater – DHDR8-24-36 (36 W); for 12 / 24 VAC devices – SATD1 series transformers.

    Pros

    • Power supply and Modbus repeater in one
    • Galvanic isolation
    • Up to 32 devices, up to 1200 m
    • Automatic baud rate detection up to 115.2 kbps
    • RJ45 and terminal connections
    • Overload and short-circuit protection

    Cons / limitations

    • PoM power is limited to 20 W – for a larger 24 VDC load, additionally use the DHDR8-24-36
    • IP20 – in a cabinet only
    • Operating temperature up to +40 °C
    • Half-duplex communication (Modbus RTU)

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified electrician with the mains supply disconnected.
    • Hazardous mains voltage is present on terminals L and N.
    • IP20 – install only in a dry, enclosed cabinet.
    • Do not exceed a total PoM load of 20 W.

    Quick selection guide

    Power over Modbus
    24 VDC 20 W
    Modbus RTU
    RJ45
    DIN rail
    Suitable when you need:
    • to power and connect Modbus sensors with a single UTP cable;
    • to amplify and isolate the Modbus RTU line;
    • to reduce the number of power supplies on site.
    Check before use:
    • the sum of the power of the PoM devices (up to 20 W);
    • the number of devices (up to 32) and the line length (up to 1200 m);
    • the connection type – RJ45 or terminals.
    Important reminder: The DPOM8-24-20 is not a Modbus controller – it powers and boosts the line, while the data is read by a controller or BMS.

    FAQ

    How many devices can be connected?
    Up to 32 devices can be connected, and the line can reach up to 1200 m.
    What is the baud rate?
    The speed is set automatically up to 115.2 kbps.
    Can it be connected without RJ45?
    Yes, the terminals duplicate the RJ45 sockets.
    What is the PoM power?
    The module supplies 24 VDC / 20 W to the Modbus line.
    Can it be installed outdoors?
    No, the protection class is IP20, so it is installed only inside a cabinet.
    How do I change the settings?
    Settings are changed from a computer via the CNVT-USB-RS485-V2 converter and the 3SModbus software.

    Power over Modbus power module with Modbus RTU repeater | 24VDC | 20W | 85-264VAC | RJ45 | DIN rail | IP20 | Sentera Controls | DPOM8-24-20

    Sentera DPOM8-24-20 – a Power over Modbus power module with a galvanically isolated Modbus RTU repeater, 24 VDC / 20 W, RJ45 connectors and DIN rail mounting.

    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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