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Advantech ADAM-4168 Modbus register map

8-channel relay output module with pulse output, RS485 Modbus RTU

  • Official
  • 79 registers
  • Modbus RTU
  • Revision 2 · 2026-10-17

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 8N1 · 9600 baud, 8 data bits, none parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
1-based · wire address = address − 1

Connection values are defaults: the device may be configured differently.

Map

Registers
63 holding registers, 16 coils
Groups
5
Revision
2 · 2026-10-17
Added
()
File
maps/advantech/adam-4168.mbmap.json · 12 KB · history
SHA-256
d5c57995fed9a90fa77ca954444a07fdffd33105fbcdda21a34d4d1d49d99a0f
Manufacturer
advantech.com

Sources and notes

Source: Advantech, "ADAM-4100 Series User's Manual", Edition 1.3, Appendix B.4 (I/O Modbus mapping table)

  • Addresses are the Modicon numbers of the manual (00001 = coil 1, 10001 = discrete input 1, 40001 = holding register 1).
  • The module ships with the ADAM ASCII protocol; the manual's appendix explains how to switch it to Modbus RTU.
  • 32-bit values (pulse settings and delays) use two registers; the manual does not give their word order or the units of the delays.
  • The manual leaves the module name values blank for this module.
AreaAddressNameTypeAccessUnitScaleDescription
CO 17 bool RW
CO 18 bool RW
CO 19 bool RW
CO 20 bool RW
CO 21 bool RW
CO 22 bool RW
CO 23 bool RW
CO 24 bool RW
CO 33 bool R
CO 34 bool R
CO 35 bool R
CO 36 bool R
CO 37 bool R
CO 38 bool R
CO 39 bool R
CO 40 bool R
HR 1 uint32 ABCD RW ms ×0.1
HR 3 uint32 ABCD RW ms ×0.1
HR 5 uint32 ABCD RW ms ×0.1
HR 7 uint32 ABCD RW ms ×0.1
HR 9 uint32 ABCD RW ms ×0.1
HR 11 uint32 ABCD RW ms ×0.1
HR 13 uint32 ABCD RW ms ×0.1
HR 15 uint32 ABCD RW ms ×0.1
HR 17 uint32 ABCD RW ms ×0.1
HR 19 uint32 ABCD RW ms ×0.1
HR 21 uint32 ABCD RW ms ×0.1
HR 23 uint32 ABCD RW ms ×0.1
HR 25 uint32 ABCD RW ms ×0.1
HR 27 uint32 ABCD RW ms ×0.1
HR 29 uint32 ABCD RW ms ×0.1
HR 31 uint32 ABCD RW ms ×0.1
HR 33 uint32 ABCD RW 0 = continuous
HR 35 uint32 ABCD RW
HR 37 uint32 ABCD RW
HR 39 uint32 ABCD RW
HR 41 uint32 ABCD RW
HR 43 uint32 ABCD RW
HR 45 uint32 ABCD RW
HR 47 uint32 ABCD RW
HR 49 uint32 ABCD RW
HR 51 uint32 ABCD RW
HR 53 uint32 ABCD RW
HR 55 uint32 ABCD RW
HR 57 uint32 ABCD RW
HR 59 uint32 ABCD RW
HR 61 uint32 ABCD RW
HR 63 uint32 ABCD RW
HR 65 uint16 RW
HR 66 uint16 RW
HR 67 uint16 RW
HR 68 uint16 RW
HR 69 uint16 RW
HR 70 uint16 RW
HR 71 uint16 RW
HR 72 uint16 RW
HR 73 uint32 ABCD RW
HR 75 uint32 ABCD RW
HR 77 uint32 ABCD RW
HR 79 uint32 ABCD RW
HR 81 uint32 ABCD RW
HR 83 uint32 ABCD RW
HR 85 uint32 ABCD RW
HR 87 uint32 ABCD RW
HR 89 uint32 ABCD RW
HR 91 uint32 ABCD RW
HR 93 uint32 ABCD RW
HR 95 uint32 ABCD RW
HR 97 uint32 ABCD RW
HR 99 uint32 ABCD RW
HR 101 uint32 ABCD RW
HR 103 uint32 ABCD RW
HR 211 uint16 R
HR 212 uint16 R
HR 213 uint16 R
HR 214 uint16 R
HR 215 uint16 R
HR 216 uint16 R
HR 303 uint16 RW Bit n = relay n

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