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图(c)为按下SB1按钮后的第二个扫描周期。①输入扫描，由于输入状态不变，输入映像区不变。②执行程序过程，***行，X0触点闭合，由于上一个周期中，Y1为ON状态，因此，Y1触点也闭合，Y0也呈导通状态；第二行，Y1还呈导通状态。Y0、Y1的状态均为“1”。③输出刷新过程，两个灯都亮。注意：由于PLC的扫描周期很短，我们用肉眼见到的现象可能是两灯同时亮。如果按钮没有变化，内部继电器、输出设备状态均无变化。
图( d)为松开SB1按钮后的***个扫描周期。①输入扫描使输入映像区的X0存“0”、 X1存“1”。②执行程序过程，X0触点断开， Y1由于上个周期被置“1”，因此，Y1触点为闭合状态。③输出刷新过程，由于X0触点的断开，Y0 、Y1都呈断开状态。
Pacific Scientific SC903-024-01
Berger Lahr SER3910/4L3SS0CO
Alpha Getriebe SPK 140-MF2-14-151-000
Siemens ECOFAST 3RK1303-6DS74-3AA3
Alpha Planetengetriebe SP 140-M2-28
Krones Servomotor DSD 056L64U30-5TENV 3,7kW Nr. 424214
Control Techniques Midi Maestro 140 X 8/16 DC
INDRAMAT HMS01.1N-W0020-A-07-NNNN CSB01.1N-SE-RNS-NNN-N
Berger Lahr VRDM 31122/50
Siemens Fuss 1LA7134-6AA16-Z
Siemens FBCB100M
Getriebe Nord SK 02050AZDH-90S/4TF
SEW-Eurodrive MGFAS2-D***-DSC-B/ECR
Siemens 1LA7133-4AA11
Vogel Kegelradgetriebe H 30 265035
Wittenstein alpha alphira 115-1 277034
ABB Drehstrommotor M2QA 132 M4A
Bauer ZU-AF 10.380
Lenze 9400 E94ASHE0034B22ERNN -S0034HX0051 15315637
SEW Eurodrive Getriebemotor KAZ 37 DRE80M4/TH/EI76
Wittenstein alpha 115-1 240116
BOB Gleichstrom Servomotor BB 96.90.55 - SN6
Siemens 3VL9600-3MQ00
INDRAMAT DDS2.1-W025-D + DSS1.3 + D***2.1-S11-01.RS
Kollmorgen 601 S60100-SE 1,0kVA
Wittenstein alpha TPK+010F-MF2-20-0E1-1K01 20051286
Siemens 1MA7113-2BB60-Z 3,3KW
Getriebebau Nord SK 1SI75-IEC112/3D
HüBNER LongLife-DC-Tachogenerator TDP 0,2LT-4 Ser.-Nr
HüBNER LongLife-DC-Tachogenerator TDP 0,2LT-4 TDP 0,2
ELAU Servomotor SH100/30100/0/0/00/00/00/00/00
Sinano Electric AC Servomotor 4MA170-PAB-1 EX TS5791
Dunkermotoren BG75X50SI + 88711 05601 Asto E300R24
Leeson Watts***er C213T17FC7C 60HZ 3PH
DEMAG Cranes Linearmotor LMK 52-10/6
Siemens SIMODRIVE 6SN1146-1AB00-0BA1
Siemens SIMODRIVE 6SN1123-1AA00-0BA1
mayr ROBA-topstop P3107148 8210127
SEW Eurodrive KAZ 37 DRS71M4/TH/EI7C
Baldor RelianceXE 3 Ph. P18G4924 BH RPM17
Harmonic Drive HPD-180-28-B2/R38-85-180
SEW Eurodrive R57 DT90L4/TH
INDRAMAT Ecodrive DKC01.1-040-7-FW 265406 + FWA-ECODRV-
SEW Eurodrive ST47 DT71D2/BMG/HR/TF
Siemens SIMODRIVE 6SN1123-1AB00-0BA1
Siemens SIMODRIVE 6SN1123-1AB00-0BA0
Indramat ECODRIVE DKC01.1-040-7-FW 265406 + FWA-ECODRV
SEW-Eurodrive DFV100L/BMG/TF/***T/H3GD
SEW-EURODRIVE S47 DT71D8
Lenze BASE UNIT 8400 E84ABBNE7524SN0 HW: 1A
HüBNER LongLife-DC-Tachogenerator TDP 0,2LT-4
Atlas Copco 4230190383
Lenze BFK458 BFK458-20N 15010267
INTORQ BFK458 BFK458-20N 13315907
Siemens SIMODRIVE 6SN1123-1AA00-0AA1
Kollmorgen S700 S70302-NANANA-NA / HW: 02.10
mayr ROBA-topstop Sicherheitsbremse 8210127
Planetroll Getriebe PD120-FAJ025-1AAO
SICK SFM60-HMAT0K02 Ident. Nr. 1051086
Alpha Getriebe SPK 060-M02-4-00/060S02
KOGYOSHA ***-007KOGYOSHA ***-007KOGYOSHA ***-007