WJ69 8-Channel Encoder / 16-Channel Digital Input Counter Module with Modbus RTU RS485 Output

WJ69 8-Channel Encoder / 16-Channel Digital Input Counter Module with Modbus RTU RS485 Output

The WJ69 8-Channel Encoder / 16-Channel Digital Input Counter Module is an industrial data acquisition module designed for high-precision pulse counting, encoder signal measurement, and digital input monitoring. It supports up to 8-channel encoder inputs or 16-channel digital input counting, making it suitable for a wide range of industrial automation and control applications.

Featuring a Modbus RTU communication protocol over an RS485 interface, the WJ69 enables reliable long-distance data transmission and easy integration with PLCs, industrial computers, HMI systems, and other Modbus-compatible devices. Its multi-channel design allows simultaneous monitoring of multiple signals, helping improve system efficiency and simplify industrial data collection.

The WJ69 module is ideal for applications such as rotary encoder monitoring, production line counting, equipment status monitoring, automated machinery, and industrial control systems.

Datasheet

Features

• The encoder is decoded and converted into standard MODBUS RTU protocol
• Can be used as an encoder counter or speed measurement
• Support 8 encoders to count at the same time, can identify forward and reverse
• It can also be set as 16 independent DI high-speed counters
• Encoder count value supports automatic saving after no power 
• DI input / power supply isolation: 3000VDC
• Through the RS-485/232 interface can clear and set the count value
• Wide power supply range: 8 ~ 32VDC
• High reliability, convenient programming and easy application
• Standard DIN35 rail installation, convenient for centralized wiring
• The user can program the module address, baud rate, etc.
• Dimensions: 120 mm x 70 mm x 43mm

Function 

• The WJ69 remote I/O module can be used to measure eight-channel encoder signals, and it can also be set as a 16-channel independent counter or DI state measurement.
• Signal input
• 8-channel encoder signal input or 16-channel independent counter can be connected to dry contact and wet contact. Please refer to the wiring diagram section for details.
• Communication protocol
• Communication interface: 1 standard RS-485 communication interface or 1 standard RS-232 communication interface, specify when ordering and selecting.
• Communication protocol: supports two protocols, the character protocol defined by the command set and the MODBUS RTU communication protocol. The module automatically recognizes the communication protocol and can realize network communication with various brands of PLC, RTU or computer monitoring systems.
• Data format: 10 bits. 1 start bit, 8 data bits, 1 stop bit. No verification.
• The communication address (0～255) and baud rate (2400, 4800, 9600, 19200, 38400, 57600, 115200bps) can be set; the longest distance of the communication network can reach 1200 meters, and it is connected through a twisted pair shielded cable.
• The communication interface is designed with high anti-interference, ±15KV ESD protection, and the communication response time is less than 100mS.
• Anti-interference
• The checksum can be set as required. There are transient suppression diodes inside the module, which can effectively suppress various surge pulses, protect the module, and the internal digital filter can also suppress the power frequency interference from the power grid.

Package Includes

• 1x WJ69 8-Channel Encoder / 16-Channel Digital Input Counter Module with Modbus RTU RS485 Output