The Beijing Tengcon T-902 is a Box DIN rail PLC that serves as a 24-channel relay output module within the T9 series of wide-temperature programmable controllers. Engineered for demanding industrial environments, the T-902 combines robust hardware with flexible communication options, making it suitable for applications ranging from remote I/O expansion to standalone machine control. The device is designed for easy installation on standard DIN rails or via screw mounting, with a compact footprint of 169x134x63mm and a weight of 0.5kg.

At its core, the T-902 is powered by an ARM industrial CPU capable of running at up to 72MHz. The hardware platform includes 32MB of SDRAM and 4MB of FLASH memory, with 2MB dedicated to user program storage and 2MB for user data. A 1KB battery-backed data storage area provides retention for critical parameters for up to one year. The minimum instruction cycle time is 4ms, with integer and bit instructions executing in 1-4µs and floating-point operations in approximately 40µs.

The primary I/O consists of 24 relay outputs, each with a contact capacity of 250V/5A or 30VDC/5A, making the T-902 ideal for directly controlling solenoids, contactors, and other high-power industrial loads. Communication capabilities are extensive: a 10/100M Ethernet port supports Modbus/TCP and IEC870-5-104 protocols; two RS232/RS485 ports support Modbus RTU and free port programming; and a dedicated CAN port provides additional fieldbus connectivity. An 8-bit DIP switch allows for flexible IP address configuration, with all switches set to ON resetting the IP to 192.168.1.99. Front-panel LEDs provide clear status indication for RUN, COM1/COM2 activity, Ethernet LINK, and DATA transmission.

Programming the T-902 is accomplished using KW MULTIPROG, a professional software environment fully compliant with the IEC 61131-3 international standard. Programs are downloaded via the Ethernet interface, enabling convenient remote maintenance and debugging. The T-902 operates over a wide temperature range from -40°C to +85°C, with humidity tolerance from 5% to 95% RH non-condensing, and carries an IP20 protection rating. The power supply accepts either 220VAC (with a range of 90-250VAC) or 24VDC, with maximum power consumption under 12W. Rated current is 23mA at 220VAC with all outputs fully loaded. The T-902 is an ideal solution for harsh industrial automation applications, including oil and gas field monitoring, distributed control systems, and remote I/O expansion in extreme environments.

Technical Specifications