Introduction
All Maple Systems HMIs programmed with EBPro (EasyBuilder Pro), including every cMT X Series and cMT Series model, are compatible with an Emerson PLC EC20. Configure your Controller and HMI/cMT with the following parameters to establish reliable communication.
Supported Series: EMERSON PLC EC20 Series. (Modbus RTU Protocol)
HMI Setting
| Parameters | Recommended | Options | Notes |
|---|---|---|---|
| PLC type | EMERSON PLC EC20 | ||
| PLC I/F | RS232 | ||
| Baud rate | 9600 | 9600, 19200, 115200 | |
| Data bits | 8 | 7 or 8 | |
| Parity | Even | Even, Odd, None | |
| Stop bits | 1 | 1 or 2 | |
| PLC sta. no. | 0 | 0-255 |
PLC Setting
Communication mode: Modbus RTU protocol
Device Address
| Bit/Word | Device type | Format | Range | Memo |
|---|---|---|---|---|
| B | Y | OOO | 0 ~ 377 | 0000-02550 |
| B | X | OOO | 0 ~ 377 | 1200-01455 0000-0255 |
| B | M | DDDD | 0 ~ 1999 | 2000-3999 |
| B | SM | DDD | 0 ~ 255 | 4400-4655 |
| B | S | DDD | 0 ~ 991 | 6000-6991 |
| B | T | DDD | 0 ~ 255 | 8000-8255 |
| B | C | DDD | 0 ~ 255 | 9200-9455 |
| W | D | DDDD | 0 ~ 7999 | 0000-7999 |
| DW | D_Double | DDDD | 0 ~ 7998 | |
| W | SD | DDD | 0 ~ 255 | 8000-8255 |
| W | Z | DD | 0 ~ 15 | 8500-8515 |
| W | TV | DDD | 0 ~ 255 | 9000-9255 |
| W | CV | DDD | 0 ~ 199 | 9500-9699 |
| DW | C_Double | DDD | 200 ~ 255 | 9700-9811 |
Wiring Diagram
NOTE: The serial port pin assignments may vary between HMI models.
RS-232 (Emerson EC20 COM1: RS-232 Terminal)
| HMI | Direction | PLC |
|---|---|---|
| Pin assignments | RS232 Terminal | |
| Rx | ↔ (bidirectional) | TX |
| Tx | ↔ (bidirectional) | RX |
| GND | ↔ (bidirectional) | GND |