ABB B21

Firmware v2 register overview for the ABB B21 mapping.

Mapping behaviour

• Device Manager mapping value: 5

• Profile: ABB_B21

• Read function codes: FC03 and FC04

• Register widths: 32-bit entries unless a text/fill range is shown

• 32-bit word order: high word first (MSW-LSW)

• Unmapped register handling: Modbus exception

Device ID, baud rate and serial format are global firmware v2 settings. They are not changed when this mapping is selected.

Register overview

Address (decimal / hex)	Words	Type	Source or fixed value	Conversion	Missing
23296 / 0x5B00	2	uint32	voltage_l1_v	scale 10	source_default
23298 / 0x5B02	2	uint32	voltage_l2_v	scale 10	source_default
23300 / 0x5B04	2	uint32	voltage_l3_v	scale 10	source_default
23308 / 0x5B0C	2	uint32	derived_current_l1_a	scale 100	source_default
23310 / 0x5B0E	2	uint32	current_l2_a	scale 100	source_default
23312 / 0x5B10	2	uint32	derived_current_l3_a	scale 100	source_default
23316 / 0x5B14	2	int32	net_power_total_int_x100_legacy	—	source_default
23318 / 0x5B16	2	int32	net_power_l1_int_x100_legacy	—	source_default
23320 / 0x5B18	2	int32	net_power_l2_int_x100_legacy	—	source_default
23322 / 0x5B1A	2	int32	net_power_l3_int_x100_legacy	—	source_default

Reading the table

• Words is the number of consecutive 16-bit Modbus registers occupied by the entry.

• Source names correspond directly to the firmware v2 recipe source.

• Conversion records the exact scale, transform or direction handling configured by the recipe.

• This page is generated from mb_recipe.h and modbus_profiles.h for firmware 2.3.0.