子程序块(仅对系列90-30 PLC)当程序运行时,可调用子程序块,在使用CALL指令调用子程序之前,该子程序必须通过程序块说明编辑器加以说明。在一个程序模块中最多有64个子程序块说明。该程序中每-逻辑程序块最多允许使用64个CALL指令,子程序模块最大为16K字节或3000回路。但主程序和全部子程序均需满足CPU型号对逻辑字节数的限制(对子程序逻辑程序块尺寸的
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