各位逻辑大神帮忙看看这两个块的逻辑！

王天泽

上图来自ISA5.2  4.7

A process operation may be affected by loss of the power supply* to memories and to other logic elements.  In order to take such operating eventualities into account, it may therefore be necessary to consider the effect of loss of power to any logic component or to the entire logic system.  In such cases, it may be necessary to enter power supply or loss of power supply as logic inputs to a system or to individual logic elements.  For memories, the consideration of power supply may be handled in this manner or as shown in Sections 4.7b, c, and d.

By the same token, it may be necessary to consider the effect of restoration of power supply.Logic diagrams do not necessarily have to cover the effect of logic power supplies on process systems but may do so for thoroughness.

上段英文来之ISA5.2 3.8（原文）


同时，请参阅：
HG20505表5.6.1 12-18