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  3. Axon S515

Unipi Technology Axon S515 Modbus register map

Unipi Axon S515 PLC: 4 analog inputs, 4 analog outputs

  • Official
  • 60 registers
  • Modbus TCP
  • Revision 3 · 2026-11-10

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
Unit ID
0
TCP port
502
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
43 holding registers, 17 coils
Groups
7
Translation tables
1
Revision
3 · 2026-11-10
Added
()
File
maps/unipi/axon-s515.mbmap.json · 13 KB · history
SHA-256
6d1fc1481fb288e620621f0c06d7010fc7e5919d61f2e3a65f6b0b98bb49de89
Manufacturer
www.unipi.technology

Sources and notes

Source: unipi-axon-s515-modbus-registers.xlsx, Unipi knowledge base page https://kb.unipi.technology/en:hw:04-extensions:downloads

  • Addresses are those of the column 'Via Unit 0' (Modbus TCP unit id 0); the column 'Via Unit 1' gives the same addresses for this single-group model.
  • Unipi Axon and Neuron use Modbus TCP. By default the Modbus server listens only on the loopback interface; it can be opened to other interfaces by changing its systemd script (Description sheet). The TCP port and the unit id used here are not stated in the spreadsheet: 502 is the Modbus default.
  • Registers marked Reserved or Obsolete in the spreadsheet, and those named (Internal), are left out. Multi-register values are big-endian (most significant register first). The spreadsheet types Real as a two-register floating point value, read here as float32; its Description sheet text about half and single precision is ambiguous.
  • Coils (suffix (coil)) repeat digital inputs, outputs and some settings that also appear as bits of holding registers. Analog values are in the unit selected by the analog input or output configuration register; the spreadsheet gives no unit for them.
AreaAddressNameTypeAccessUnitScaleDescription
HR 0 uint16 RW
HR 1 uint16 RW
HR 2 uint16 RW
HR 3 uint16 RW
HR 4 float32 ABCD R
HR 6 float32 ABCD R
HR 8 float32 ABCD R
HR 10 float32 ABCD R
HR 12 bool bit 0 RW
HR 12 bool bit 1 RW
HR 13 bool bit 0 RW
HR 13 bool bit 1 RW
HR 13 bool bit 2 RW
HR 13 bool bit 3 RW
HR 13 bool bit 4 RW
HR 13 bool bit 5 RW
HR 13 bool bit 6 RW
HR 13 bool bit 7 RW
HR 13 bool bit 8 RW
HR 13 bool bit 9 RW
HR 13 bool bit 10 RW
HR 13 bool bit 11 RW
HR 13 bool bit 12 RW
HR 13 bool bit 13 RW
HR 1000 uint16 R
HR 1001 uint16 bits 0–7 R
HR 1001 uint16 bits 8–15 R
HR 1002 uint16 bits 0–3 R
HR 1002 uint16 bits 4–7 R
HR 1002 uint16 bits 8–15 R
HR 1003 uint16 R
HR 1004 uint16 R
HR 1005 uint32 ABCD R
HR 1007 bool bit 0 RW
HR 1007 bool bit 1 RW
HR 1007 bool bit 2 RW
HR 1007 bool bit 3 RW
HR 1008 uint16 RW ms
HR 1009 uint16 R
HR 1010 uint16 RW
HR 1011 uint16 RW
HR 1012 uint16 RW
HR 1013 uint16 RW
CO 0 bool RW
CO 1 bool RW
CO 2 bool RW
CO 3 bool RW
CO 4 bool RW
CO 5 bool RW
CO 6 bool RW
CO 7 bool RW
CO 8 bool RW
CO 9 bool RW
CO 10 bool RW
CO 11 bool RW
CO 12 bool RW
CO 13 bool RW
CO 1000 bool RW
CO 1002 bool R
CO 1003 bool RW

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