ABB MNSiS Motor Control Center MConnect Interface

3. Configure parameters

The Modbus interface parameters of MConnect need to be consistent with the circuit breaker release, and the parameter settings are as follows:

Parameter optional range, default value description

Slave Address 2-247 247 needs to be configured the same as the PR unit of the circuit breaker

Baudrate rate 9600/19200 bps 19200 bps communication rate, needs to match PR unit settings

Protocol parity check 1 stop bit, odd parity check 1 stop bit, no parity check 2 stop bit, no parity check 1 stop bit, even parity check 1 stop bit. The format of the data check and stop bit should match the PR unit

Attention: The MConnect main site address is fixed at 1 and cannot be modified by users; Only supports "point-to-point" communication and does not support multiple bus slaves.

Data and Command Interaction

The document provides a detailed definition of data collection (status, measurement values, alarm/trip information) and control commands for MConnect and two types of release devices (PR12x/PR33x, Ekip). The core content is as follows:

1. PR12x/PR33x series release

(1) Status data (32-bit unsigned number, Motorola byte order)

Device status bits: There are a total of 16 bits, with key bits meaning "open (Bit0), closed (Bit1), tripped (Bit2), undefined (Bit3), discharged (Bit4)", and the remaining bits reserved (set to 0).

Extended Status Flag: Contains 8 types of flags, including State 2-9, covering alarm/trip (such as "any alarm" and "circuit breaker trip"), operating mode (local/remote), communication status (no communication on local bus), programming status (successful/failed programming), etc. Each type of flag is a 16 bit unsigned number (UWORD).

(2) Measurement value

Covering over 20 electrical parameters such as current, voltage, power, frequency, and energy, examples are as follows:

Measurement item data type unit invalid value explanation

L1 phase current (effective value) ULONG (unsigned long integer) A 0xffffffff current displays 0 when<minimum value, and displays maximum value when>maximum value

Line voltage V12 (effective value) UWORD-10 (10 times unsigned short integer) V 0xffff displays 0 when voltage<minimum value, and displays maximum value when voltage>maximum value

Total active power (signed) LONG_10 (10 times integer) kW 0x7ffffffff Display 0 when power<minimum value, display ± maximum value when out of range

Frequency UWORD_10 (10x unsigned short integer) Hz 0xffff: When the frequency is less than the minimum value, the minimum value is displayed, and when it is greater than the maximum value, the maximum value is displayed

Total active energy (signed) LONG kWh - cumulative energy value, supporting forward/reverse metering

(3) Alarm and trip information

By defining the STATE 4-6 (alarm) and STATE 8-9 (trip lock) flag bits, it covers over 30 abnormal scenarios such as "harmonic distortion exceeding 2.1", "contact wear alarm", "overvoltage trip", "hardware fault trip", etc. Each scenario corresponds to a specific bit (setting 1 indicates triggering).

2. Ekip series release (Emax2 specific)

(1) Status and measurement values

Status difference: The device status bit only retains "disconnected (Bit0), closed (Bit1), tripped (Bit2), undefined (Bit3)", and the remaining bits are reserved; The extended state is divided into four categories: global state (such as circuit breaker closure/isolation), timing state (such as L/S/G timing triggering), trip state (such as overload trip), and warning/alarm state (such as sensor error), covering more detailed intelligent monitoring scenarios.

Measurement value expansion: Added parameters such as "RC current (external grounding current)", "power factor (in kiloparts)", "PT100 temperature", etc., with data types compatible with PR12x/PR33x.

(2) Additional information collection

Support the full lifecycle data of circuit breakers, such as "Circuit Breaker Serial Number (16 bit ASCII)", "Installation Date/Last Maintenance Date (seconds from December 31, 1999)", "Operation Times (Opening Count)", "Contact Wear Percentage (0-65000 corresponds to 0% -100%)", etc., for easy maintenance and management.

3. Control commands (universal)

Only when the circuit breaker release is manually switched to "remote mode" (password required), the following commands can be sent through the MLink fieldbus:

Command function

CB Close Circuit Breaker Close

CB Open circuit breaker disconnected

CB Reset Circuit Breaker Reset

Trip Reset resets the trip records stored in the release device

Wink Toggle Command Circuit Breaker Identification (Tripper Display Flashing)

NOP no operation (no action)

4. Data validity (quality code)

Identify data validity through "QualityCode1" and "QualityCode2" (32-bit unsigned numbers):

Bit=0: Data is valid; Bit=1: Invalid data.

QualityCode1 covers measurement values (such as current, voltage, power), while QualityCode2 covers status indicators (such as alarm, trip) and equipment information (such as serial number, rated current).