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  2. Moxa
  3. ioLogik E1242

Moxa ioLogik E1242 Modbus register map

Also covers ioLogik E1242-T

Remote Ethernet I/O with 4 analog inputs, 4 digital inputs, 4 configurable DIO channels and a two-port Ethernet switch

  • Official
  • 138 registers
  • Modbus TCP
  • Revision 2 · 2026-10-17
  • Identity: firmware

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
1
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
21 holding registers, 48 input registers, 45 coils, 24 discrete inputs
Groups
7
Revision
2 · 2026-10-17
Added
()
File
maps/moxa/iologik-e1242.mbmap.json · 22 KB · history
SHA-256
5e602e1b4486ab40217f24f886f2435f247eab41a369273cdf203abab83bd426
Manufacturer
moxa.com

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
Firmware Firmware version major input 5029 uint16 bits 8–15
Firmware Firmware version minor input 5029 uint16 bits 0–7
Firmware Firmware version patch input 5030 uint16 bits 8–15

Sources and notes

Source: Moxa, "ioLogik E1200 Series User Manual", version 16.1 (April 2024), Appendix A

  • Default Modbus/TCP address map (Appendix A). The addresses can be changed in the web console under user-defined Modbus addressing; this map fits the defaults.
  • 32-bit values are high word first.
  • Scaled values are float32.
  • The manual notes that the AI scaled values incorporate word swapping and the DI counter values byte swapping; check the word and byte order of these values on the device.
  • DI 0-3 are the DI channels and DI 4-7 the DIO channels set as inputs; DO 0-3 are the DIO channels set as outputs.
AreaAddressNameTypeAccessUnitScaleDescription
IR 512 uint16 R
IR 513 uint16 R
IR 514 uint16 R
IR 515 uint16 R
IR 520 float32 ABCD R
IR 522 float32 ABCD R
IR 524 float32 ABCD R
IR 526 float32 ABCD R
IR 528 uint16 R
IR 529 uint16 R
IR 530 uint16 R
IR 531 uint16 R
IR 532 uint16 R
IR 533 uint16 R
IR 534 uint16 R
IR 535 uint16 R
IR 536 float32 ABCD R
IR 538 float32 ABCD R
IR 540 float32 ABCD R
IR 542 float32 ABCD R
IR 546 float32 ABCD R
IR 548 float32 ABCD R
IR 550 float32 ABCD R
IR 552 float32 ABCD R
IR 576 uint16 R
IR 577 uint16 R
IR 578 uint16 R
IR 579 uint16 R
HR 544 uint16 RW
HR 545 uint16 RW
HR 546 uint16 RW
HR 547 uint16 RW
HR 560 float32 ABCD RW
HR 562 float32 ABCD RW
HR 564 float32 ABCD RW
HR 566 float32 ABCD RW
CO 4145 bool RW Write 1 to reset the minimum values
CO 4146 bool RW Write 1 to reset the minimum values
CO 4147 bool RW Write 1 to reset the minimum values
CO 4148 bool RW Write 1 to reset the minimum values
CO 4153 bool RW Write 1 to reset the maximum values
CO 4154 bool RW Write 1 to reset the maximum values
CO 4155 bool RW Write 1 to reset the maximum values
CO 4156 bool RW Write 1 to reset the maximum values
DI 0 bool R
DI 1 bool R
DI 2 bool R
DI 3 bool R
DI 4 bool R
DI 5 bool R
DI 6 bool R
DI 7 bool R
IR 48 uint16 R Bit n = DI n (DI-00 in bit 0)
IR 16 uint32 ABCD R
IR 18 uint32 ABCD R
IR 20 uint32 ABCD R
IR 22 uint32 ABCD R
IR 24 uint32 ABCD R
IR 26 uint32 ABCD R
IR 28 uint32 ABCD R
IR 30 uint32 ABCD R
CO 256 bool RW
CO 257 bool RW
CO 258 bool RW
CO 259 bool RW
CO 260 bool RW
CO 261 bool RW
CO 262 bool RW
CO 263 bool RW
CO 272 bool RW Write 1 to reset the counter to its initial value
CO 273 bool RW Write 1 to reset the counter to its initial value
CO 274 bool RW Write 1 to reset the counter to its initial value
CO 275 bool RW Write 1 to reset the counter to its initial value
CO 276 bool RW Write 1 to reset the counter to its initial value
CO 277 bool RW Write 1 to reset the counter to its initial value
CO 278 bool RW Write 1 to reset the counter to its initial value
CO 279 bool RW Write 1 to reset the counter to its initial value
CO 288 bool RW Write 1 to clear the overflow flag
CO 289 bool RW Write 1 to clear the overflow flag
CO 290 bool RW Write 1 to clear the overflow flag
CO 291 bool RW Write 1 to clear the overflow flag
CO 292 bool RW Write 1 to clear the overflow flag
CO 293 bool RW Write 1 to clear the overflow flag
CO 294 bool RW Write 1 to clear the overflow flag
CO 295 bool RW Write 1 to clear the overflow flag
DI 1000 bool R
DI 1001 bool R
DI 1002 bool R
DI 1003 bool R
DI 1004 bool R
DI 1005 bool R
DI 1006 bool R
DI 1007 bool R
CO 0 bool RW
CO 1 bool RW
CO 2 bool RW
CO 3 bool RW
CO 16 bool RW
CO 17 bool RW
CO 18 bool RW

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