The CMeX40 is an M-Bus slave module with one input and output. The product monitors digital input signals which are read and sent to a receiving system, through an M-Bus master. Based on the reports displayed in the receiving system, commands may be sent to the M-Bus master to control the breaker of the electrical equipment connected to the CMeX40 output.
Parts Overview
- Input GND
- Input +
- Relay output
- Relay output
- Serial number (secondary address)
- Push button
- M-Bus connector
DIN-rail mounting
The product is mounted on a DIN-rail. The clip on the bottom is used to attach and detach the product from the DIN-rail. For safety reasons, a DIN-rail enclosure must cover all terminals.
Connecting the power supply
The installation must be performed by a qualified electrician or another professional with the required knowledge.
- Connect the power to a clearly marked and easily accessible switch to make sure the product can be switched off during service work.
- If the product is installed and can be exposed for voltage transients higher than OVC II (Overvoltage Category 2), use an external transient protection.
Connecting to M-Bus
All connected M-Bus slave devices must have unique primary or secondary M-Bus addresses depending on addressing mode used.
Measure voltage over M-Bus slave connection to verify M-Bus master connection. Voltage should be between 21-42 VDC.
M-Bus is a multi-drop 2-wire bus, with no polarity.
- Use a cable of area 0.25-1.5 mm2, e.g. a standard telephone cable (EKKX 2x2x0.5).
- Connect the wiring to the connector.
LED indications
The product is equipped with a single LED, which can show the colors green and red in combinations. The green LED shows current input status and the red LED shows current relay output status.
Red LED
| Mode | Description | Visual |
|---|---|---|
| 1000 ms off/10 ms on | Short flash every second. Charging of capacitor is taking place. |
|
| 4000 ms off/10 ms on | Short flash every 4 second. Relay output is off. |
|
| 4000 ms off/100 ms on/300 ms off/100 ms on | 2 short flashes every second. Relay output is on. |
|
Green LED
| Mode | Description | Visual |
|---|---|---|
| 4000 ms off/10 ms on | Short flash every 4 second. Input is off (open). |
|
| 4000 ms off/100 ms on/300 ms off/100 ms on | 2 short flashes every second. Input is activated. |
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