描述
I/O继电器，或称映射区。它与PLC所能控制的I/O点数及模拟量的路数直接相关。
内部继电器数，有的称为标志位数，代表着PLC的内部继电器数。它与I/O继电器区相联系着，有时与后者相联系进行处理。内部继电器多，便于PLC建立复杂的时序关系，以实现多种多样的控制要求。一般讲，内部继电器数比I/O继电器要多得多。
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