描述
输入输出（I/O）点数的估算
I/O点数估算时应考虑适当的余量，通常根据统计的输入输出点数，再增加10%～20%的可扩展
余量后，作为输入输出点数估算数据。实际订货时，还需根据制造厂商PLC的产品特点，对输入输出点数进行圆整。
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