Due to the difference in programming software, the Siemens S7-200 and S7-300/400 plc differ in the logic symbols used for ladder programming, as shown in the table. Some symbols in the table are non-universal symbols and can only be used in the S7-200 (or only in the S7-300/400). Nonwoven Fabric,Non Woven,Non Woven Material,Non Woven Geotextile Fabric Longkou Libo Insulating Material Co.,Ltd. , https://www.liboinsulation.com