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Air handler controller · Modbus register map

Regin Corrigo ventilation controller (ventilation application 3.6) Modbus register map

Updated 24 October 2026

Manufacturer

Regin

Model

Corrigo ventilation controller (ventilation application 3.6)

Equipment type

Air handler controller

Registers

134 (45 writable)

Transport

Modbus RTU

Default unit ID

1

Default serial

9600 baud, 8N1

Documented addressing

Modicon 3xxxx/4xxxx (drop the prefix, subtract 1)

Firmware

Corrigo ventilation application 3.6

Also known as

Corrigo E, Corrigo ventilation, Corrigo E ventilation, Corrigo AHU controller

Source document

Corrigo ventilation - List of network variables for EXOline, Modbus and BACnet communication (from version 3.6) · Revision 20 · rev. 2016-07

Regin Corrigo ventilation controller (ventilation application 3.6) Modbus registers

Address = 0-based wire address (the documented number is shown under it when it differs) · Order: ABCD = high word first, CDAB = low word first · Scale: engineering value = raw × scale.

• Coils2
• Discrete inputs47
• Input registers42
• Holding registers43

Notes on this map

• Scaling: the manual says Real (R) signals are multiplied by 10, time-setting signals by 100 and air flow signals by 1; Integer, Index and Logic signals are not scaled. Scale 0.1 is applied to every Real register here except the air flows.
• Signedness is not stated per register. Real and Integer values are listed as INT16 because temperatures and offsets can be negative; Index (enumeration) values are UINT16. A x10 value in INT16 cannot exceed 3276.7, so very high pressures or CO2 readings may not fit.
• Extract/exhaust naming is swapped inside the controller: 30009 (variable ExhaustAirTemp) is extract air from the room, and 30020 (variable ExtractAirTemp) is exhaust air leaving the unit. Names here follow the measured air, as the manual's own notes do.
• Enumerations are the Modbus values. The same points over BACnet start at 1 instead of 0 (e.g. run state Stopped is 0 on Modbus, 1 on BACnet).
• Left out: the per-alarm status registers (30071 onward). In the 3.6 list the value legend (0 Not used, 1 Normal, 2 Blocked, 3 Acknowledge) is printed in the rows of alarms 2-5, which hides those alarms' names, and the full legend only appears in the older 3.2 list. Use the alarm discrete inputs (10033 onward, 0 = no alarm, 1 = alarm) instead.
• Left out: fan running-hour counters (30004/30005) and accumulated fan energy (30275/30279), because a x10 16-bit value overflows quickly and the manual gives no rollover or energy unit.
• Left out: weekly schedules (40040-40263, HH.MM x100), holiday dates, PID tuning, alarm delays, I/O assignment indexes, expansion-unit I/O, the real-time clock and the slave-drive tables in chapter 7.
• Printing errors in the source: the UAI3 and DO3 assignment registers are printed as 3040 and 3066 instead of 30040 and 30066 (neither is included here).
• Transport: the manual describes RTU framing only. It names Modbus TCP just as one possible physical layer in a general paragraph, so TCP is not listed here.
• Terminology: the manual's introduction defines 'exhaust' and 'extract' the opposite way round from the register descriptions; the descriptions here follow the register rows and the 3.2 list, where point 9 is the extract (room return) air and point 20 the exhaust air.

Questions about the Regin Corrigo ventilation controller (ventilation application 3.6)

Source: Corrigo ventilation - List of network variables for EXOline, Modbus and BACnet communication (from version 3.6) · Revision 20 · rev. 2016-07. Register numbers, types, scaling and units are reproduced as published; descriptions are our own.