This document is the instruction manual of JMDM series 20DIOV2 products, which introduces the input and output signals of the product and gives detailed wiring instructions.
The guide describes the input signals (low‑level active) and their required +24 V common connections, as well as the three output types (4MT4MR hybrid, 8MT transistor, 8MR relay) and their voltage ranges. It also covers power supply wiring, program download via serial port, and dip‑switch configuration.
Common issues such as poor serial communication, non‑responsive I/O, and controller overheating are addressed with troubleshooting steps and safety warnings. This manual is written in Chinese.
| Input signal level | Low‑level active |
|---|---|
| Transistor output voltage range | 12‑24 V |
| Relay output voltage range | 0‑220 V |
| Power supply (default) | AC 18 V (or DC 24 V after rectification) |
Use a computer with an RS232 serial port and ensure the RS232 cable or USB‑to‑serial converter is of good quality.
A low‑quality DC24V supply can produce voltage spikes that damage the controller.