User manual for the SM400 PLC alarm device, detailing hardware, configuration software, and service information.
The SM400 PLC alarm device integrates an ARM processor and a GSM module to provide SMS, telephone, or combined alerts for industrial monitoring and data acquisition. It supports eight digital inputs, two analog inputs (4‑20 mA), and three relay outputs, and can be remotely controlled via mobile SMS.
The manual covers hardware description, port functions, wiring diagrams, software configuration steps, alarm SMS settings, and warranty information, helping users install, configure, and maintain the device in harsh industrial environments. This manual is written in Chinese.
| Installation size | 133 mm × 61 mm |
|---|---|
| Enclosure size | 147 mm × 103 mm × 31 mm |
| Operating temperature | -20 ℃ ~ +80 ℃ |
| Storage temperature | -25 ℃ ~ +80 ℃ |
| Power input voltage | DC 9 ~ 24 V |
| Analog input range | 4 ~ 20 mA |
| Protection rating | IP65 |
| Relay outputs | 3 |
The device can send SMS, make a telephone call, or both when an alarm condition occurs, using its built‑in GSM module.
It operates from a DC power source between 9 V and 24 V.
The SM400 has an IP65 protection rating, suitable for harsh environments.
The device provides three relay outputs that can be configured for alarm or remote control.