Compatible Devices
• Eaton Programmable Controller [g3-eatonelc | Word]
Verified Device
• ELC‑PB14NNDR‑4 [g3-eatonelc | Word]
Driver Options
- Select ASCII or RTU mode
- If using RTU, data length MUST be 8 bits [g3-eatonelc | Word]
Device Options
- The programmer sets the device address for communication [g3-eatonelc | Word]
Accessible Data
| **Prefix** | **Description** | **Maximum Range*** | **Notes** |
|---|---|---|---|
| D | Holding Register | 0 – 9999 | 1,2 |
| M | Memory Bit | 0 – 4095 | 2 |
| S | Step Point / Memory Bit | 0 – 1023 | |
| X | External Input | 0 – 255 | |
| Y | External Output | 0 – 255 | |
| TV | Timer Value | 0 – 255 | |
| TC | Timer Contact | 0 – 255 | |
| CV | Counter Value – 16-bit | 0 – 255 | |
| CL | Counter Value – 32-bit | 0 – 255 | |
| CC | Counter Contact | 0 – 255 |
* Maximum ranges may vary by model. The programmer must verify valid addresses for the specific device. [g3-eatonelc | Word]
Important Notes
- D registers must use the correct data type matching the PLC program logic
- The D range is not continuous for some models (e.g., PB series)
- Addresses above 999 may contain system values
- Writing to these without understanding may affect PLC operation [g3-eatonelc | Word]
Cable Information
RS232 Serial Connection
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RS485 Serial Connection
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Programming Cable Connection (RS232)
| **9-Pin D** | **Signal** | **RJ** |
|---|---|---|
| 2 | RxD ← TxD | 5 |
| 3 | TxD → RxD | 2 |
| 5 | 0V | 3 or 4 |
Summary
This driver provides access to Eaton ELC PLC memory using standard prefixes for registers, bits, timers, and counters. Key points:
- Supports ASCII and Modbus RTU-style communication
- Requires correct data type matching (especially “D” registers)
- Includes both bit-level and word-level addressing
- Care must be taken with system registers and non-contiguous memory
👉 Practical takeaway:
- Always verify address ranges and data types against the ELC program
- Be cautious when writing to higher memory ranges, as they may be reserved or system-critical
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