DEIF · Generator controller
AGC-4 (option H2/H9 Modbus), diesel genset application Modbus register map
Default configuration
- Protocol
- RS485
- Port
- 502
- Unit ID
- 1
- Addressing
- 0-based
- Byte order
- Big endian
- Word order
- High word first
- Baud rate
- 19200
- Parity
- None
- Data bits
- 8
- Stop bits
- 1
This device has an RS-485 interface. Reach it through a Modbus RTU-to-TCP gateway, configured with the factory serial settings above.
Register map
| Address | Count | Name | Type | Unit | Scale | Access |
|---|---|---|---|---|---|---|
| 0 | 1 | Remote start Write 1 to start the generator set from the SCADA system (diesel genset application). | Binary | - | 1 | RW |
| 1 | 1 | Remote generator breaker ON Write 1 to close the generator breaker. | Binary | - | 1 | RW |
| 2 | 1 | Remote generator breaker OFF Write 1 to open the generator breaker. | Binary | - | 1 | RW |
| 3 | 1 | Remote stop Write 1 to stop the generator set. | Binary | - | 1 | RW |
| 4 | 1 | Alarm inhibit 1 Write 1 to inhibit alarm group 1. | Binary | - | 1 | RW |
| 5 | 1 | Alarm inhibit 2 Write 1 to inhibit alarm group 2. | Binary | - | 1 | RW |
| 6 | 1 | Alarm inhibit 3 Write 1 to inhibit alarm group 3. | Binary | - | 1 | RW |
| 7 | 1 | Reset GOV/AVR regulation output to off Write 1 to reset the governor/AVR regulation output to off. | Binary | - | 1 | RW |
| 9 | 1 | Alarm acknowledge Write 1 to acknowledge alarms. | Binary | - | 1 | RW |
| 10 | 1 | Nominal setting 1 Select nominal setting 1. | Binary | - | 1 | RW |
| 11 | 1 | Nominal setting 2 Select nominal setting 2. | Binary | - | 1 | RW |
| 12 | 1 | Nominal setting 3 Select nominal setting 3. | Binary | - | 1 | RW |
| 13 | 1 | Nominal setting 4 Select nominal setting 4. | Binary | - | 1 | RW |
| 14 | 1 | Start + synchronise (semi-auto) Start and synchronise in semi-automatic mode. | Binary | - | 1 | RW |
| 15 | 1 | Deload / stop (semi-auto) Deload and stop in semi-automatic mode. | Binary | - | 1 | RW |
| 24 | 1 | Mains breaker ON (single genset) Close the mains breaker in a single-genset application. | Binary | - | 1 | RW |
| 25 | 1 | Mains breaker OFF (single genset) Open the mains breaker in a single-genset application. | Binary | - | 1 | RW |
| 27 | 1 | Manual mode Select manual mode. | Binary | - | 1 | RW |
| 28 | 1 | Semi-auto mode Select semi-automatic mode. | Binary | - | 1 | RW |
| 29 | 1 | Auto mode Select automatic mode. | Binary | - | 1 | RW |
| 31 | 1 | External frequency control Enable external frequency control. | Binary | - | 1 | RW |
| 32 | 1 | External voltage control Enable external voltage control. | Binary | - | 1 | RW |
| 34 | 1 | External reactive power control Enable external reactive power control. | Binary | - | 1 | RW |
| 35 | 1 | External power factor control Enable external power factor control. | Binary | - | 1 | RW |
| 36 | 1 | Capacitive power factor Select capacitive power factor. | Binary | - | 1 | RW |
| 37 | 1 | Base load Select base load operation. | Binary | - | 1 | RW |
| 38 | 1 | Priority 1 Select priority 1. | Binary | - | 1 | RW |
| 44 | 1 | Battery test Start a battery test. | Binary | - | 1 | RW |
| 46 | 1 | Synchronise clock to 04:00 Synchronise the controller clock to 04:00. | Binary | - | 1 | RW |
Notes
Genset controller with Modbus RTU on RS-485 (option H2) or RS-232 (option H9): reach it through a Modbus RTU-to-TCP gateway. Fixed line settings: 9600 or 19200 bps, 8 data bits, no parity, 1 stop bit, no flow control. Modbus addresses 0-499 are the configurable (Profibus/Modbus configurator) area and are NOT used for measurements here; every measurement address is in the fixed range 500+, with the values the controller publishes for the diesel genset (DG) application. Scaling: actual value = register * 10^-scaling (exponent 1 gives 0.1, exponent 2 gives 0.01). INT32 counters occupy two registers, high word first. The Modbus slave address is a setting (parameters 7500-7520); 1 is used here. Sources, both downloadable without an account (plain HTTP GET): (1) DEIF 'AGC-4, Options H2 and H9, Modbus communication', document 4189341180 C, https://deif-cdn-umbraco.azureedge.net/media/purl03z4/option-h2-and-h9-modbus-communication-agc-4-4189341180-uk.pdf - addressing, 500+ fixed area, 10^-scaling rule, line settings. (2) DEIF 'AGC-4 Modbus tables', document 4189341215A (software 4.73.0), spreadsheet https://deif-cdn-umbraco.azureedge.net/media/xywdqum0/agc-4-modbus-tables-4189341215-uk.xlsx - per-register names, data types, scaling, units and DG/Mains/BTB applicability (sheets 'Input register (04)', 'Discrete output coil (01;05;15)', 'Holding register (03;06;16)'); that URL currently serves the same tables as Revision I (software 4.83.0), and the rows used here are identical in 4189341215A and Revision I. Alarm, power-management and plant-logic registers are left out because their content depends on the application configuration.