保持置位线圈和复位线圈与置位和复位线圈类似。但虽经电源消失或当PLC由STOP转为RUN模式时,它们仍保持住。一个保持置位线圈当其通电时,将把一个离散地址置为ON。这个地址将一直保持为ON,直到由一保持复位线圈所复位为止。保持置位线圈将为既定的参考地址,而把一个非定义结果写人转换位(参见第二章操作系统中关于“转换与超驰”的情况)。
AMAT 3870-01385 Valve Blank Plate Assy for SMC VV5Z3 Se
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