描述
输出也可以到存储器中，但要规定一个地址。这时PID功能块的输出成为另一块功能块的输入。如串级控制，第一个PID的输出是第二个PID的设定，这时PV有二个，也用二个站功能块，但只有一个站功能块有手/自切换关系。手操站和操作站直接与该功能块通讯，其优先权手操站高于操作站。
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