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  3. TAPCON 240

Reinhausen TAPCON 240 Modbus register map

Voltage regulator for on-load tap-changers with the CIC communication card

  • Official
  • 41 registers
  • Modbus RTU
  • Revision 2 · 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 RTU
Unit ID
1
Serial
9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit
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
1 holding register, 4 input registers, 13 coils, 23 discrete inputs
Groups
7
Revision
2 · 2026-10-18
Added
()
File
maps/reinhausen/tapcon-240.mbmap.json · 7 KB · history
SHA-256
08e074a385fea62d0766b31e01d31dae7648a5904d5a37db07184a12a61610e9
Manufacturer
reinhausen.com

Sources and notes

  • Voltage regulator TAPCON 240, Protocol description MODBUS · version 2398449/01 EN, 2011-07
    section 5, data points

Source: Maschinenfabrik Reinhausen, "Voltage regulator TAPCON 240, Protocol description MODBUS", supplement 2398449/01 (2011-07), section 5

  • Modbus RTU or ASCII over RS-232, RS-485 or fibre. ASCII uses 7E1, RTU 8E1.
  • The optional RJ45 port carries Modbus RTU wrapped in TCP (factory port 1234, 19200 baud), not Modbus TCP.
  • Coils can only be written (FC05); their state cannot be read back. Write one coil or one register per request.
  • Commands from the control system are only executed when the regulator is in remote mode.
  • Coil 8 is either 'raise/lower desired voltage value' or 'desired voltage value 1', depending on how MR parameterised the device.
AreaAddressNameTypeAccessUnitScaleDescription
CO 0 bool W On raises; only in manual mode
CO 1 bool W On lowers; only in manual mode
CO 5 bool W
CO 8 bool W Optional function, parameterised by MR; replaces desired voltage value 1-3
CO 8 bool W Only when no inputs select values 2 and 3 and raise/lower desired value is not parameterised
CO 9 bool W
CO 10 bool W
CO 11 bool W Sets a flag that the regulator can use like an input
CO 12 bool W Sets a flag that the regulator can use like an input
CO 13 bool W Sets a flag that the regulator can use like an input
CO 15 bool W Parallel operation method
CO 27 bool W Parallel operation method
CO 28 bool W Parallel operation method
DI 0 bool R
DI 1 bool R
DI 2 bool R
DI 3 bool R
DI 4 bool R
DI 5 bool R
DI 8 bool R
DI 9 bool R
DI 10 bool R
DI 11 bool R
DI 12 bool R
DI 13 bool R
DI 14 bool R
DI 15 bool R
DI 16 bool R The supplement does not say which value means local
DI 17 bool R Parameterisable message, on when its input or relay is active
DI 24 bool R
DI 25 bool R Parameterisable message, on when its input or relay is active
DI 26 bool R Parameterisable message, on when its input or relay is active
DI 27 bool R
DI 28 bool R
DI 29 bool R
DI 30 bool R Parameterisable message, on when its input or relay is active
IR 0 int16 R -40 to 40
IR 1 uint16 R V ×0.1 0-170.0 V
IR 2 int16 R % ×0.1 Percent of the effective voltage level
IR 5 int16 R % ×0.01
HR 0 uint16 RW V ×0.1 Raw 490-1400

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