HollySys introduced small PLCs in 2004. Due to its stable functionality and value for money, a consensus was developed among its clients in industries such as heating, ventilation, and air-conditioning (HVAC), municipal administration, construction machinery, packaging, logistics, and railway. Leveraging on HollySys’ accumulated experience in PLC, HollySys successfully developed suitable coal industry applications for mining purposes. HollySys’ mining module integrates 3 functions which are: measurement, protection, and communication, and it is currently the principal control system for the coal power industry. HollySys provides an all-encompassing integrated monitoring solution that combines comprehensive power monitoring, site power control, and power driven system, thus providing the whole coal industry with a complete professional power distribution solution.