I. Basic Positioning
Model: WR-D4007
Manufacturer: Reliance Electric (Ryan) / Rockwell Automation
System: AutoMax DCS Rack-mounted System (old model but still widely used in industrial sites)
Function: 32 channels of 24VDC digital input + dual serial ports + backplane bus
Commonly known as: Usually referred to as “interface module / communication module / DI with serial ports” in the field
Hardware Interfaces (Why like “Communication Converter”)
Front panel communication ports (key)
PORT1: RS-232 (D-Sub 9-pin)
PORT2: RS-422/485 (D-Sub 9-pin)
Can be used for: Modbus RTU master / slave, custom protocols, and interfacing with third-party serial devices
Backplane bus
Insert into AutoMax rack and communicate at high speed with CPU and other I/O cards
Field input terminals
32 channels of 24VDC digital input (polarized / non-polarized selectable)
Each channel has an LED status indicator
Core Parameters (DI + Communication)
Input: 32 channels, 24VDC ±10%, 4mA / point
Isolation: 500Vrms (channel-to-channel, channel-to-ground)
Filtering: 1–10ms software adjustable (anti-jamming)
Serial ports:
Baud rate: up to 115.2 kbps
Protocols: Modbus RTU, ASCII, Reliance proprietary protocol
Operating temperature: 0 ~ +60°C
Installation: Standard AutoMax I/O rack, supports hot swapping
Typical “Communication Conversion” Usage
Although it is essentially a DI module + dual serial ports, it is often used in the field as follows:
Serial port ↔ AutoMax bus gateway
Connect third-party RS-232/485 instruments, frequency converters, serial sensors to AutoMax DCS
Modbus RTU ↔ Private protocol conversion
As a Modbus slave station, provide 32 points of DI + serial data to the upper-level SCADA/PLC
Remote I/O acquisition + transmission
Field 32-point switch quantity → WR-D4007 → serial port / backplane → control system
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