Overview
Configured for PROFIBUS DP Master communication in industrial control networks, the ABB CM672 (CM672 Communication Module) provides direct electrical execution for cyclic data exchange between the control system and connected PROFIBUS DP field devices. It uses an EIA RS-485 interface and supports transmission rates from 9.6 kbit/s to 12 Mbit/s.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | CM672 |
| Brand | ABB |
| Product Type | PROFIBUS DP Master Communication Module |
| Communication Protocol | PROFIBUS DP |
| Transmission Standard | EIA RS-485 according to IEC 61158 / IEC 61784 |
| Transmission Rate | 9.6 kbit/s to 12 Mbit/s |
| Transmission Rate Configuration | Automatically detected or configured |
| Electrical Isolation | Potential-free interface |
| Interface Connection | 9-pin D-sub socket |
| Power Supply | 24 VDC |
| Supply Ripple | Maximum 5% of nominal value |
| Degree of Protection | IP20 |
| Operating Temp | 0 to +60 deg C, horizontal mounting; 0 to +40 deg C, vertical mounting |
| Storage Temp | -40 to +70 deg C |
| Relative Humidity | Maximum 95%, non-condensing |
| Dimensions | 28 mm x 135 mm x 62 mm |
| Weight | Approximately 0.12 kg |
ABB Industrial Network Communication Characteristics
The ABB CM672 supports deterministic field communication through the PROFIBUS DP network and uses the RS-485 physical layer for data transmission. The module operates as a PROFIBUS DP Master and manages communication with connected DP field devices through its 9-pin D-sub interface.
In addition, the selectable or automatically detected transmission rate supports integration with PROFIBUS DP segments operating from 9.6 kbit/s to 12 Mbit/s. Correct network termination, cable routing, shielding, and grounding therefore remain necessary to maintain stable RS-485 communication performance.
Frequently Asked Questions (FAQ)
Q: What communication protocol does the ABB CM672 support?
A: The CM672 operates as a PROFIBUS DP Master communication module and uses the EIA RS-485 transmission standard according to IEC 61158 and IEC 61784.
Q: What transmission rates are supported by the ABB CM672?
A: The module supports PROFIBUS DP transmission rates from 9.6 kbit/s to 12 Mbit/s. The transmission rate can be automatically detected or configured.
Q: Does the mounting orientation affect the operating temperature?
A: Yes. Horizontal mounting supports an operating temperature range of 0 to +60 deg C, while vertical mounting supports 0 to +40 deg C.
Field Installation Guidelines
Install the ABB CM672 in an enclosure that provides protection appropriate for its IP20 rating. Maintain sufficient clearance around the module for wiring and heat dissipation.
Connect the PROFIBUS DP network through the specified 9-pin D-sub socket. Use PROFIBUS-compatible shielded cable and maintain correct RS-485 cable routing throughout the network segment.
Ground the cable shield according to the applicable control cabinet and PROFIBUS installation practice. Separate communication wiring from high-current power conductors and variable-frequency drive cables where possible.
Verify network termination at both physical ends of the PROFIBUS segment. Also confirm the configured communication rate and connected field device parameters before placing the network into operation.
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