通过PLC程序可以将倍率读到$A_DBB[0]等NC变量中，可以自己编写程序，也可以编写Prog_Event.spf 程序，在加工程序一启动的时候自动调用，当然这是个选件。

还需要修改机床数据20108 PROG_EVENT_MASK（可以设为1，在Start-of-part-program时调用）
Bit 0 = 1 : Start-of-part-program
Bit 1 = 1 : End-of-part-program
Bit 2 = 1 : Operator panel reset
Bit 3 = 1 : Ramp-up
Bit 4 = 1 : Reserved
Bit 5 = 1 : Safety program booting

Prog_event.spf 程序可放在一下目录

The user program is called via the following search path:
1. /_N_CUS_DIR/_N_PROG_EVENT_SPF
2. /_N_CMA_DIR/_N_PROG_EVENT_SPF
3. /_N_CST_DIR/_N_PROG_EVENT_SPF
The safety program has to be available in the following location:
1. /_N_CST_DIR/_N_SAFE_SPF

11620 $MN_PROG_EVENT_NAME

11622 $MN_PROG_EVENT_PATH：
0: /_N_CMA_DIR
1: /_N_CUS_DIR
2: /_N_CST_DIR
3: Search path in the sequence /_N_CUS_DIR, /_N_CMA_DIR, and /_N_CST_DIR