The selection of PLC capacity includes two contents:I/O interface amount and user storage size.When estimating the I/O interface amount,the control margin should be considered.Generally,according to the recorded I/O interface amount,it can be expanded by 10%~20%.After the development margin of,it is used as the estimated information of the number of I/O points.The user storage size is usually estimated according to 10-15 times the amount of digital I/O interfaces,and then 100 times the amount of analog I/O interfaces to complete the estimation,when the control unit is more complex and the amount of information collected is large.Then expand it according to the actual situation.
PLC容量大小的选择包含I/O接口量和用户存储大小两个内容,I/O接口量估算时要考虑控制的余量,一般依照记录的I/O接口量,再扩展10%~20%的可发展余量后,作为I/O点数估算信息。用户存储大小通常依照数字量I/O接口量10-15倍,再算上模拟I/O接口量的百倍完成估算,当控制单元较为复杂、信息采集量较多时。则依照实际情况再扩展些。
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