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我使用的是西门子S7-200PLC作控制,对TP170触摸屏做外部按键操作。现需四个功能键(F1、F2、F3、F4),用于触摸屏画面的切换;十个数字键(0-9)、两个方向键和退出键(ESC)、删除键(DEL)、回车键(ENTER)用于参数数字的设定及修改。但考虑到节省PLC输入点,我用矩阵扫描的方法SCHULER PRESSEN ZAE W-1990 BEVEL GEAR REDUCER, RATIO 2:
THOMSON TWN20 BALL BUSHING SUPER PILLOW BLOCK,
NIBCO SCH 80, CPVC UNION, 1 1/2" SIZE, 150 PSI, LOT OF
NUMATICS F900H-16AG, DELTA SERIES FILTER, 1 MICRON, 2"
FESTO DNC-4"-24-PA-MF?1 PNEUMATIC PROFILE CYLINDER,

DODGE TIGEAR SIZE / RATIO 180C262B0 GEAR REDUCER, NNB
PERMA CLASSIC AUTOMATIC LUBRICATOR, 4.06 fl.oz., LOT OF
SPARKS BELTING CO 0065-WWW8 INDUSTRIAL CONVEYOR BELTING
SPARKS BELTING CO FG-22870 | 10 ENDUROTHANE CONVEYOR BE
GENERAL ELECTRIC DE361R FLEX-A-PLUG PLUG-IN DEVICE BUS
ELAU SM 070-60-010-P0-4?5-S1-B0 MOTOR W/ ALPHA GEAR
HARTING, 90537, RECEPTICAL MALE AND FEMALE CABLE, 10 PO
BIG DAISHOWA MZW-20A (NFB2511B) BABY CHUCK, NIB SEALED
SEW-EURODRIVE INC. DFT71D4BMG05HFI?S .5 HP APPROX 1/2" S