2CSG251161R4051, M4M 20 I/O: M4M 20 I/O analyzer: measurement wiring, I/O and communication setup
The ABB M4M 20 I/O is a panel-mounted network analyzer in a 96 × 96 mm format. ABB describes two digital outputs, two analog inputs and two programmable I/O, with 48–240 V AC/DC auxiliary supply, Bluetooth and Modbus RTU. Verify the exact measurement connections and configuration before integrating it into an energy-monitoring system.
Key technical data
| Technical item | Verified value / selection note |
|---|---|
| Type | M4M 20 I/O |
| Order code | 2CSG251161R4051 |
| Mounting | Front panel, 96 × 96 mm |
| Auxiliary supply | 48–240 V AC/DC |
| Interfaces | Bluetooth and Modbus RTU |
| Configurable I/O | 2 digital outputs, 2 analog inputs and 2 programmable I/O |
| Accuracy class | 0.5S reference; confirm measured quantity and setup |
The table summarizes family or catalog values for identification and initial selection. Confirm the nameplate, environmental limits, standards, revision and options for the exact device before procurement or engineering approval.
Application and system selection
The instrument is intended to measure and communicate electrical network quantities. Confirm the system voltage, current-transformer ratio, wiring topology, measured parameters, Modbus register map and alarm/output needs. The 0.5S class is a product reference and does not remove the need to check installation accuracy, CT class, burden and wiring errors.
Configuration and compatibility
Check the complete M4M order code and whether the installation needs a different communication or I/O option. Confirm panel cutout, auxiliary supply, CT secondary rating, phase sequence and the configured system type. Keep the register map and password/commissioning settings with the site documentation.
Related models and order-code references
The following designations are related catalog references, not automatic substitutes. Check each complete code, rating, connection, revision and application requirement before selecting a variant.
No additional same-series designation was identified for this representative model in the reviewed catalog rows.
Installation and commissioning
Isolate voltage and CT circuits using approved procedures; never leave an energized CT secondary open. Verify terminal torque, CT polarity, phase mapping and neutral connection before powering the analyzer. Compare displayed values with a calibrated reference or known load and confirm Modbus addressing, scaling and alarm/output behavior.
Replacement and procurement information
For a quotation or replacement review, provide the complete designation 2CSG251161R4051, M4M 20 I/O, the order code where applicable, serial or hardware revision, quantity, operating environment, connected equipment and required delivery date. Include a legible nameplate image and relevant wiring, loop or switchgear drawing so the exact interface and configuration can be checked.
Ask the supplier to confirm accessories, revision compatibility and any approved successor in writing. Do not select solely from a family name or product photograph. Follow the current ABB installation and safety instructions for the exact unit.
