We are manufacturing good quality 200/300 series PLC which are 100% compatible with Siemens S7-200/300 series PLC. All Electric Circuit Designs are composed by our own company and we have fully intellectual property of our products. Our products have been approved by CE certificates and from high quality materials. And we are committed to offer 5-years warranty on the product quality.We are mainly selling: ----We are Looking for buyers and distributors. 1. UN PLC 200 series CPU . 2. UN 200,300 series PLC .3. UN PC /PPI serial-Port and USB Adapter ; PC/MPI Serial -port and USB Adapter, (Support Siemens S7-200/300/400 CPU )4. UN Accessories : DIN rail, connector,Profibus Interface ,Profibus Cable .5. UN PS 307 Power for 5 A and 10 A .