The Omron CQM1H-PLB21 is a compact and high-performance pulse I/O board from the SYSMAC CQM1H series, designed to provide precise pulse input and output control for advanced automation applications. Equipped with two pulse inputs and two pulse outputs, it is ideal for motion control and high-speed counting tasks that demand accuracy and synchronization. The CQM1H-PLB21 is compatible with Omron CQM1H-CPU51 and CQM1H-CPU61 CPU units and is specifically designed for installation in slot 2 (the right-hand slot) of the CPU module. The board’s front panel features 12 LEDs, offering clear and immediate visual indication of operational and status conditions. Consuming a maximum of 160 mA from a 5 VDC power supply, the CQM1H-PLB21 maintains efficient power usage while delivering reliable pulse control performance. This inner board could be implemented in automation systems across North America, Europe, Asia, and other global regions, providing precise, efficient, and compact pulse I/O functionality within Omron’s CQM1H PLC architecture.