Derell Series B PLC is a high-speed and ultra-thin programmable logic controller that can handle 16-256 controllable input/output points. The main unit supports 16/32/64/96 input/output points.

The PLC is built with four pulse train outputs that can operate at 100kHz or 200kHz, six high-speed counters that can operate at up to 100kHz, and two communication ports (RS422 + RS485). The input specifications support NPN (sink input type) and PNP (source input type), while the output specifications include relay output (2A/1 point, 8A/4 points COM, 8A/8 points COM, 250 VAC, 30 VDC or less) and transistor output (0.5 A/1 point, 0.8A/4 points COM, 1.6 A/8 points COM, 5~30V DC).

The PLC comes with DLC-B Series input/output extension blocks that can be connected, and up to 7 DLC-B-EX Series special function units/blocks can be connected.

Other features of the Derell Series B PLC include a built-in switch, data registers, program memory, clock function, instruction support, processing speed, auxiliary relay and timers, and remote debugging of the program. The PLC also has communication ports for RS422/RS232/RS485, and supports expansion modules with communication function and special function. Programming communication, parallel link, MODBUS master/slave station, PC link, and inverter communication are among the provided data communication features.