Power distribution counting device I²Master®

for buildingfor indoor usemeasurement

Short description

• 8 opto‑isolated digital (ON/OFF) inputs.
• Pulse counting on 64‑bit counters.
• Configurable index retention on power loss.
• Input state indication.
• Modbus/Jbus RTU or TCP slave (depending on version).
• Adapted to ERDF telemetry racks.
• Compatible with Gazpar meters.

Description
The I²Master® is a logic acquisition and pulse counting module featuring 8 digital inputs, each individually opto‑isolated. The input high logic level supports a wide range. Each input can operate as a digital (ON/OFF) input, as a pulse counter, or both simultaneously. Index retention can be configured per channel to preserve counts during power outages.
Designed for data collection on ERDF telemetry racks in building main distribution boards and for integration with Gazpar meters, the I²Master® delivers measurement points to a master system via Modbus/Jbus RTU or TCP. Typical masters include PLCs, BMS/SCADA supervision, dataloggers or remote consumption reading systems.
The I²Master® is supplied ready to use: apart from setting the Modbus/Jbus address or IP, no initial configuration is required. Detailed channel configuration is performed via the Modbus interface without dedicated software or hardware.
For applications requiring enhanced reliability, supervision functions (hardware watchdog or monitoring on Modbus communication loss) can be enabled via Modbus.
The unit includes multiple front‑panel LEDs to simplify commissioning.

Fields of application

• Acquisition of digital signals in normal to harsh or heterogeneous conditions.
• Multi‑channel pulse counting.
• Energy accounting on ERDF telemetry racks.

Technical information (summary)

• Number of digital input channels: 8
• Individual input isolation: 2 kV
• High logic level: between 7 V and 24 V
• Counting: 64 bits
• Maximum counting frequency: 10 Hz
• High‑state hold time adjustable: 10 to 250 ms
• Configurable index backup on power loss per channel
• Individual index reset via Modbus
• Front‑panel LED indication of each input logic level
• Available buses: RS485 (twisted pair) or Ethernet (double twisted pair)
• RS485 speeds: 1200, 2400, 4800, 9600, 19200 baud
• RS485 parity: none / even / odd
• Ethernet: 10 / 100 Mbps
• Protocol: Modbus / Jbus (supported functions 3, 6 and 16)

Characteristics / technical specifications

• Displayed reference: I2MR-D.08
• Commercial name: I²Master®
• Number of digital inputs: 8
• Input isolation: 2 kV (individual)
• High logic level: 7 V to 24 V
• Counting: 64 bits
• Max counting frequency: 10 Hz
• High‑state hold time: adjustable 10–250 ms
• Index backup on power loss configurable per channel
• Individual index reset via Modbus
• LED indication of each input logic level
• Serial bus: RS485 on twisted pair
• RS485 speeds: 1200 / 2400 / 4800 / 9600 / 19200 baud
• RS485 parity: none / even / odd
• Ethernet bus: 10 / 100 Mbps
• Protocols: Modbus / Jbus (functions 3, 6 and 16; grouping length 16 registers)
• Power supply: 10 to 30 V DC
• Consumption: 0.12 W - 5 mA (typ.) @ 24 V DC
• Connections: Power and bus on removable Phoenix MSTB connector pitch 5.08; digital inputs on removable Phoenix MCV connector pitch 3.81
• Dimensions: 22.5 (W) x 101 (H) x 119 (D) mm
• Weight: 90 g
• Mounting: on symmetrical DIN rail
• Operating position: any
• Operating temperature: -20 °C to 80 °C
• Ambient humidity: 10 – 90 % RH (non‑condensing)