介绍了对HF—J型免烧制砖机控制系统改造的一次成功案例,重点阐述了三菱PLC高速计数器在生产设备中的应用。免烧制砖机对节约土地资源,节能环保起到了积极作用,因而也得到了推广应用。免烧制砖机根据自动化程度可以分为全自动免烧制砖机、半自动免烧制砖机和手动免烧砖机。HF—J型免烧制砖机是属于半自动免烧制砖机。由于工作环境 This paper introduces a successful case of the reformation of the control system of HF-J non-burning brick machine and emphatically expounds the application of Mitsubishi PLC high-speed counter in the production equipment. Burning-free brick machine to save land resources, energy saving has played a positive role, which has also been popularized. Unburned brick machine according to the degree of automation can be divided into automatic unburned brick machine, semi-automatic brick-free brick-making machine and manual burners. HF-J-type non-burning brick machine is a semi-automatic burning-free brick machine. Due to the working environment