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WEG SSW900 Modbus register map

Soft starter with Modbus RTU through the SSW900-CRS485-W accessory: measurements, status and control words, start and stop settings, motor data and serial settings

  • Official
  • 108 registers
  • Modbus RTU
  • Revision 1 · 2026-11-10
  • Identity: firmware, serial number

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.

Download .mbmap.json Raw JSON View on GitHub Suggest a correction Report a problem

Communication

Protocol
Modbus RTU
Unit ID
1
Serial
19200 8E1 · 19200 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
108 holding registers
Groups
12
Translation tables
17
Revision
1 · 2026-11-10
Added
()
File
maps/weg/ssw900.mbmap.json · 23 KB · history
SHA-256
2201db772f92edf6c98d2dff162d52f6aad9549adc6f32ef8d512823efec6b75
Manufacturer
weg.net

Device identity

What a tool can read to check that this map fits the connected device (SPEC.md section 4.7). Registers with a role are read like any other register.

Registers
RoleRegisterAddressTypeValues
Serial number Serial number holding 298 uint32 CDAB
Firmware Software package version holding 328 uint16

Sources and notes

Source: WEG SSW900-CRS485-W Modbus RTU user's manual V1.6X, document 10004628735 rev. 06

  • The soft starter needs the SSW900-CRS485-W accessory for Modbus RTU. Every parameter is the holding register whose number is its Net Id (table 10.2 of the manual); the Modicon address is 40001 + the number.
  • Values travel as integers without decimals: a current of 12.3 A is sent as 123. Scales follow the decimal places column of table 10.2.
  • 32-bit values (currents, powers, serial number, energy, hours) use two registers with the least significant word first, so word_order is little.
  • The manual lists 8-bit parameters; they are read and written as one register each.
  • Only the most used parameters are listed, not the full table 10.2. Other parameters can be added the same way (register = Net Id).
  • The parameter numbers (S1.1.1 and so on) in the descriptions are the menu codes of the manual.
  • The manual is in Portuguese; the English edition for V1.4X (document 10004628707) could not be downloaded. Written from the manufacturer's document; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 1 uint16 R % ×0.1 S1.1.6; soft starter current as a percentage of its rated current
HR 2 uint16 R % ×0.1 S1.1.5
HR 3 uint16 R % ×0.1 S1.2.5
HR 4 uint16 R V ×0.1 S1.2.4
HR 5 uint16 R % ×0.1 S1.2.6
HR 6 uint16 R % ×0.1 S1.3.2
HR 7 uint16 R V ×0.1 S1.3.1
HR 8 uint16 R ×0.01 S1.5.4
HR 9 uint16 R % ×0.1 S1.7.1; torque as a percentage of rated
HR 10 uint32 CDAB R kW ×0.1 S1.5.1
HR 12 uint32 CDAB R kVA ×0.1 S1.5.2
HR 14 uint32 CDAB R kVAr ×0.1 S1.5.3
HR 16 uint16 R S1.6.1
HR 17 uint16 R Hz ×0.1 S1.6.2
HR 18 uint16 R S1.6.3
HR 24 uint32 CDAB R A ×0.1 S1.1.4
HR 26 uint32 CDAB R A ×0.1 S1.1.1
HR 28 uint32 CDAB R A ×0.1 S1.1.2
HR 30 uint32 CDAB R A ×0.1 S1.1.3
HR 33 uint16 R V ×0.1 S1.2.1
HR 34 uint16 R V ×0.1 S1.2.2
HR 35 uint16 R V ×0.1 S1.2.3
HR 42 uint32 CDAB R s D6.1; value in seconds
HR 44 uint32 CDAB R s D6.2; value in seconds
HR 50 uint16 R % ×0.1 S4.2.1; highest value, a fault occurs at 100 %
HR 52 uint32 CDAB R kWh ×0.1 D4.6.1; total energy
HR 59 uint16 R D4.7.1; number of starts
HR 60 int16 R °C S4.1.1
HR 63 int16 R °C S4.3.1; needs the PT100 accessory
HR 64 int16 R °C S4.3.2; needs the PT100 accessory
HR 65 int16 R °C S4.3.3; needs the PT100 accessory
HR 90 uint16 R D1.1.1; fault number
HR 91 uint16 R D2.1.1; alarm number
HR 92 uint16 R D2.1.2
HR 93 uint16 R D2.1.3
HR 94 uint16 R D2.1.4
HR 95 uint16 R D2.1.5
HR 101 uint16 RW % C1.2
HR 102 uint16 RW s C1.3
HR 104 uint16 RW s C1.13
HR 110 uint16 RW % C1.7; percent of rated motor current
HR 111 uint16 RW % C1.5
HR 202 uint16 RW C1.1; changed only with the motor stopped
HR 220 uint16 RW C3.1; see the manual for the values
HR 229 uint16 RW C3.2
HR 230 uint16 RW C3.3
HR 232 uint16 R S3.1.2
HR 293 uint16 R S3.4.1
HR 294 uint16 R S3.3.1
HR 296 uint16 R S3.3.2
HR 297 uint16 R S3.3.3
HR 298 uint32 CDAB R S3.3.4
HR 328 uint16 R ×0.01 S3.2.1
HR 335 uint16 R S3.5.1
HR 336 uint16 R S3.5.2
HR 400 uint16 RW V C2.1
HR 401 uint16 RW A ×0.1 C2.2
HR 402 uint16 RW rpm C2.3
HR 404 uint16 RW kW ×0.1 C2.4
HR 677 uint16 R S2.1.1; bit 0 to 5 = DI1 to DI6
HR 678 uint16 R S2.1.2; bit 0 to 2 = DO1 to DO3
HR 679 uint16 R S3.1.1
HR 680 uint16 R S3.1.3.1; full 16-bit word
HR 680 bool bit 0 R
HR 680 bool bit 1 R
HR 680 bool bit 2 R
HR 680 bool bit 3 R
HR 680 bool bit 4 R
HR 680 bool bit 5 R
HR 680 bool bit 6 R
HR 680 bool bit 7 R
HR 680 bool bit 8 R 1 = remote, 0 = local
HR 680 bool bit 9 R
HR 680 bool bit 10 R
HR 680 bool bit 11 R
HR 680 bool bit 12 R time before start
HR 680 bool bit 13 R time after stop
HR 680 bool bit 14 R
HR 680 bool bit 15 R
HR 685 uint16 RW S5.2.5; full 16-bit word; the RS485 accessory in slot 1 uses it
HR 685 bool bit 0 RW 1 = run, 0 = stop
HR 685 bool bit 1 RW
HR 685 bool bit 2 RW
HR 685 bool bit 3 RW 1 = counter-clockwise, 0 = clockwise
HR 685 bool bit 4 RW 1 = remote, 0 = local
HR 685 bool bit 7 RW 0 to 1 resets a fault
HR 686 uint16 RW S5.2.6; full 16-bit word; the RS485 accessory in slot 2 uses it
HR 686 bool bit 0 RW 1 = run, 0 = stop
HR 686 bool bit 1 RW
HR 686 bool bit 2 RW
HR 686 bool bit 3 RW 1 = counter-clockwise, 0 = clockwise
HR 686 bool bit 4 RW 1 = remote, 0 = local
HR 686 bool bit 7 RW 0 to 1 resets a fault
HR 692 uint16 R S3.1.4.1; bit field: system start, firmware download, guided start-up, incompatible settings, reset needed, HMI copy, test mode
HR 695 uint16 RW S5.3.1; bit 0 to 2 set DO1 to DO3 over the network
HR 696 uint16 RW S5.3.2.1; 0 = 0 %, 1023 = 100 %
HR 730 uint16 RW C8.2.1
HR 731 uint16 RW C8.2.2
HR 732 uint16 RW C8.2.3
HR 733 uint16 RW C8.2.4

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