当参数是通过数值结果的，变量值拷贝到被调用块的本地堆栈寄存器中，变量地址被保存。被调用块内读写这个参数的所有逻辑直接访问堆栈寄存器。被调用块执行完成后，堆栈寄存器内的数值重新拷贝到实际的变量地址中。在被调用块执行过程中，实际变量值没有发生变化，但是被调用块执行完成后，实际变量值被更新。
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Conair Teach Pendant PM-20HC #38000
Allen Bradley Guardmaster Control 440F-C28026 #32807
Boy Injection Unit #6383 WHL
Boy Injection Unit 50M #6395 WHL
Nippon Denso Servo Teach Pendant 463870-0210 #10407
Sumitomo Variable Frequency Drive HF3204-A75-W #36428
GE Fanuc IC655ALG516A Analog Input ** #10485
Triad Microguard Controller MG-28-0F-20 #31322
T & B Russellstoll ESDFH8414F00 Safety Switch #28349
Dynapar Speed Regulator MS200S200 115/230 Volt #31810
Sulzer Flooded Pump 1130707 Impeller 7″ #8908
Honeywell PWA Controller 30755393-502 #13850
Gemco Quik-Set II 1988-M-12-XGM Control #32298
Bosch Pilot Valve 0 811 404 304 #13263
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