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  3. EPFCB

Microidea EPFCB Modbus register map

Automatic power factor controller with up to 13 capacitor steps, Modbus over RS485 or Ethernet

  • Official
  • 219 registers
  • Revision 1 · 2026-10-18

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

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Communication

Protocol
Modbus TCP and RTUdefault
Unit ID
1default
TCP port
502default
Serial
9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit defaults
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
0-based

Connection values are defaults: the device may be configured differently.

Map

Registers
142 holding registers, 77 input registers
Groups
7
Revision
1 · 2026-10-18
Firmware
01.07
Added
()
File
maps/microidea/epfcb.mbmap.json · 54 KB · history
SHA-256
458c8992c769c967647c5916f282175f3288d7e3f0b0db27adab2a5d190642a9
Manufacturer
microidea.it

Sources and notes

Source: Microidea, "EPFCB - Registers Modbus", firmware 01.07 (2017-11-30); https://www.microidea.it/sites/default/files/pdf/EPFC%20MODBUS%20TABLE.pdf

  • Power factor controller EPFCB. The manual file is named EPFC and its table is titled EPFCB.
  • Serial Modbus must be switched on in the setup (A.05 Serial protocol = Modbus, address 1-199); with A.04 set to Ethernet the controller uses the IP address and port from A.06.
  • The manual does not give the order of the two words of a 32-bit or 64-bit value, nor the factory serial settings. Big word order is assumed; check it against the display.
  • The single alarm bits of the 32-bit alarm words assume the high word is at the lower address.
  • Addresses 0x0048-0x004C and 0x0058-0x005C are not described in the manual.
  • Temperatures are in the unit chosen by A.07 (degrees Celsius or Fahrenheit).
AreaAddressNameTypeAccessUnitScaleDescription
IR 0 uint16 R ×0.001 Actual cos phi, sent as cos x 1000
IR 1 uint16 R V RMS voltage
IR 2 uint32 ABCD R A ×0.01 RMS current
IR 4 int32 ABCD R var Actual reactive power; negative is capacitive
IR 6 int32 ABCD R var
IR 8 int32 ABCD R W
IR 10 uint16 R %
IR 11 uint16 R %
IR 12 uint32 ABCD R One bit per alarm, 1 = active. The manual lists this as a 16-bit value but uses bit 31, so it is read here as two registers. Bits: 0 voltage too high, 1 voltage too low, 2 current too high, 3 current too low, 4 overcompensation, 5 undercompensation, 6 over temperature, 7 high THD V, 8 high THD I, 9 minimum cos, 10 external over temperature, 31 wrong frequency
IR 13 bool bit 0 R
IR 13 bool bit 1 R
IR 13 bool bit 2 R
IR 13 bool bit 3 R
IR 13 bool bit 4 R
IR 13 bool bit 5 R
IR 13 bool bit 6 R
IR 13 bool bit 7 R
IR 13 bool bit 8 R
IR 13 bool bit 9 R
IR 13 bool bit 10 R
IR 12 bool bit 15 R
IR 14 uint16 R Bits: 0 setup parameters error, 1 calibration parameters error, 2 various parameters error, 3 erase EEPROM error
IR 14 bool bit 0 R
IR 14 bool bit 1 R
IR 14 bool bit 2 R
IR 14 bool bit 3 R
IR 15 uint16 R Bit 0 = step 1 ... bit 12 = step 13, 1 = step inserted
IR 15 bool bit 0 R
IR 15 bool bit 1 R
IR 15 bool bit 2 R
IR 15 bool bit 3 R
IR 15 bool bit 4 R
IR 15 bool bit 5 R
IR 15 bool bit 6 R
IR 15 bool bit 7 R
IR 15 bool bit 8 R
IR 15 bool bit 9 R
IR 15 bool bit 10 R
IR 15 bool bit 11 R
IR 15 bool bit 12 R
IR 16 uint32 ABCD R var Reactive power the step really delivers
IR 18 uint32 ABCD R var Reactive power the step really delivers
IR 20 uint32 ABCD R var Reactive power the step really delivers
IR 22 uint32 ABCD R var Reactive power the step really delivers
IR 24 uint32 ABCD R var Reactive power the step really delivers
IR 26 uint32 ABCD R var Reactive power the step really delivers
IR 28 uint32 ABCD R var Reactive power the step really delivers
IR 30 uint32 ABCD R var Reactive power the step really delivers
IR 32 uint32 ABCD R var Reactive power the step really delivers
IR 34 uint32 ABCD R var Reactive power the step really delivers
IR 36 uint32 ABCD R var Reactive power the step really delivers
IR 38 uint32 ABCD R var Reactive power the step really delivers
IR 40 uint32 ABCD R var Reactive power the step really delivers
IR 42 uint16 R s Seconds left before the capacitor is discharged
IR 43 uint16 R s Seconds left before the capacitor is discharged
IR 44 uint16 R s Seconds left before the capacitor is discharged
IR 45 uint16 R s Seconds left before the capacitor is discharged
IR 46 uint16 R s Seconds left before the capacitor is discharged
IR 47 uint16 R s Seconds left before the capacitor is discharged
IR 48 uint16 R s Seconds left before the capacitor is discharged
IR 49 uint16 R s Seconds left before the capacitor is discharged
IR 50 uint16 R s Seconds left before the capacitor is discharged
IR 51 uint16 R s Seconds left before the capacitor is discharged
IR 52 uint16 R s Seconds left before the capacitor is discharged
IR 53 uint16 R s Seconds left before the capacitor is discharged
IR 54 uint16 R s Seconds left before the capacitor is discharged
IR 55 uint16 R °C / °F ×0.1 In the unit chosen by A.07
IR 56 uint16 R
IR 57 uint16 R
IR 58 uint16 R
IR 59 uint32 ABCD R h Total working hours
IR 61 uint16 R V
IR 62 uint32 ABCD R A ×0.01
IR 64 uint16 R %
IR 65 uint16 R %
IR 66 uint16 R °C / °F
IR 67 uint16 R °C / °F
HR 0 uint16 RW
HR 1 uint16 RW Steps to insert in manual mode: bit 0 = step 1 ... bit 12 = step 13
HR 1 bool bit 0 RW
HR 1 bool bit 1 RW
HR 1 bool bit 2 RW
HR 1 bool bit 3 RW
HR 1 bool bit 4 RW
HR 1 bool bit 5 RW
HR 1 bool bit 6 RW
HR 1 bool bit 7 RW
HR 1 bool bit 8 RW
HR 1 bool bit 9 RW
HR 1 bool bit 10 RW
HR 1 bool bit 11 RW
HR 1 bool bit 12 RW
HR 2 int16 RW ×0.01 Target cos phi: 0.85 to 1.00, or -0.90 to -0.99 for capacitive
HR 3 uint16 RW s/step
HR 4 uint16 RW
HR 5 uint16 RW A 0 or 5 to 10000
HR 6 uint16 RW ×0.01
HR 7 uint16 RW V
HR 8 uint16 RW s
HR 9 int16 RW ×0.01 0 = disabled, 0.80 to 1.00, or -0.80 to -0.99 for capacitive

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