Description
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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