当 SVCREQ 功能块得电时, PLC 将执行 FNC 的功能. 功能块所需的参数 存储在从 PARM 的地址开始. 该变量是这个功能所需的ì参数块î的起 始变量. 所需 16 位存储单元的数量由 SVCREQ 功能块的类型来决定. 参数块既可作为功能块的输入，也可作为功能块执行后的输出数据存储单元
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