有的PLC程序，在正常的工作條件下或合法操作時能正確工作，而出現非正常工作條件（如臨時停電，又很快再通電）或進行非法操作（如一些按鈕不按順序按，或同時按若干按鈕）后，程序就不能正常工作了。這種程序，就不大可靠，或說不穩(wěn)定，就是不好的程序。
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BMXNOE0110
BMXNOC0401
BMXNOM0200H
BMXNOM0200
BMXEIA0100
TCSEGDB23F24FA
BMXNOR0200H
BMXPRA0100
BMXXBP0400H
BMXXBP0600H
BMXXBP0800H
BMXXBE1000H
BMXXBP0400
BMXXBP0600
BMXXBP0800
BMXXBP1200
BMXXBE2005
BMXXBE1000
BMXXBC008K
BMXXBC015K
BMXXBC030K
BMXXBC050K
BMXXBC120K
BMXRMS008MP
BMXRMS008MPF
BMXRWSB000M
BMXRWSC016M
BMXRWSFC032M
BMXRMS128MPF
BMXXCAUSBH018
BMXXCAUSBH045
TCSMCN3M4F3C2
TCSMCN3M4M3S2
TCSXCN3M4F3S4
BMXFTB2000
BMXFTB2010
BMXFTB2020
BMXFTB2820
BMXFTW301
BMXFTW501
BMXFTW1001
BMXFCW301
BMXFCW501
BMXFCW1001
BMXFCW303
BMXFCW503
BMXFCW1003
BMXFCC051
BMXFCC101
BMXFCC201
ETXPC512M2M4006
ETXPC512M2M4010
ETXPC512M2M4020
ETXPC411M400020
ETXPC411M400040
ETXPC411M300040
ETXPC412M1M3010
ETXPC412M1M3020
ETXPC412M1M3050
ETXPC412M2M4006
ETXPC412M2M4010
ETXPC412M2M4020
ETXPC412M2M4050
ETXSC412M1M3010
ETXSC412M1M3020
ETXSC412M1M3050
ETXSC412U1M3010
ETXSC412U1M3020
ETXSC412U1M3050
ETXSC412U2M3010
ETXSC412U2M3020
ETXSC412U2M3050
ETXSC413U1M3003
ETXPA513M
ETXPA413M
ETXPA511M3
ETXPA411M3
ETXSA12B
ETXPA78BE
ETXPA78BI
ETXADRJM12
ETXPA5M1
ETXPA5M3
ETXPA4M1
ETXPA4M3
171CBB97030
171CCC76010
171CCC76010C
171CCC78010
171CCC96020
171CCC96020C
171CCC96030C
171CCC98020
171CCC98030
171CCC98091
171CCS70000
171CCS70010
171CCS76000
171CCS76000C
171CCS78000
110XCA20300
110XCA28201
110XCA28202
110XCA28203
110XCA20400
TCSEAZ01PSFM20S
TCSEAZ01PSFM20C
TCSEAZ01PSSM20S
TCSEAZ01PSSM20C
TCSEAZ01DSFM20S
TCSEAZ01LSFM20S
TCSEAZ01LSFM20C
499NEH10410
499NTR10100
TCSESB083F23F0
TCSESB083F2CU0
TCSESB093F2CU0
TCSESM043F23F0
TCSESM043F1CU0
TCSESM043F2CU0
TCSESM043F1CS0
TCSESM043F2CS0
TCSESM083F23F0
TCSESM083F1CU0
TCSESM083F2CU0
TCSESM083F1CS0
TCSESM083F2CS0
TCSESM163F23F0
TCSESM163F2CU0
TCSESM163F2CS0
TCSESM243F2CU0
TCSESM103F23G0
TCSESM103F2LG0
TCSEAAF1LFU00
TCSEAAF1LFS00
TCSEAAF1LFH00
TCSESM083F23F1
TCSESM083F23F1C
TCSESM063F2CU1
TCSESM063F2CU1C
TCSESM063F2CS1
TCSESM063F2CS1C
TCSEAM0100
TCSEAM0200
499NES18100
499NMS25101
499NMS25102
499NSS25101
499NSS25102
TCSESU051F0
TCSESU033FN0
TCSESU053FN0
TCSESU043F1N0
TCSESU083FN0
490NOC00005
490NOT00005
490NOR00003
490NOR00005
490NTC00005
TCSECE3M3M1S4
TCSECU3M3M1S4
TCSECE3M3M2S4
TCSECU3M3M2S4
TCSECE3M3M3S4
TCSECU3M3M3S4
TCSECE3M3M5S4
TCSECU3M3M5S4
TCSECE3M3M10S4
TCSECU3M3M10S4
490NTW00002
490NTW00002U
490NTW00005
490NTW00005U
490NTW00012
490NTW00012U
490NTW00080
490NTW00080U
TCSECN3M3M1S4
TCSECN3M3M1S4U
TCSECL1M3M1S2
TCSECL1M3M3S2
TCSECL1M3M10S2
TCSECL1M3M25S2
TCSECL1M3M40S2
TCSECL1M1M1S2
TCSECL1M1M3S2
TCSECL1M1M10S2
TCSECL1M1M25S2
TCSECL1M1M40S2
TCSEAAF11F13F00
TCSECN300R2
TCSEK1MDRS
TCSEK3MDS
490NTRJ11
174CEV20040
TCSEGPA23F14F
TCSEGPA23F14FK
TCSGWA242
TCSGWC241
TCSGWA272
TCSNWA241
TCSNWA271
TCSNWA2A1
TCSWAB2O
TCSWAB5O
TCSWABDH
TCSWAB2D
TCSWAB5D
TCSWAB5V
TCSWAB5VN
TCSWAB2S
TCSWAB5S
TCSWABC5
TCSWABC10
TCSWABDON
TCSWAB5DN
TCSWABP
TCSWABP68
TCSWAAC
TCSWABAC2
TCSWABAC15
TCSWAMCD
TCSWAMC67
TCSWABMK
TCSXCU1F6X1V2
UNYSPUXFFCD41
UNYSPUXFGCD41
UNYSPUXFTCD41
UNYSPUXFUCD41
UNYSPUXZFCD41
UNYSPUXZGCD41
UNYSPUXZTCD41
UNYSPUXZUCD41
UNYSPUSFGCD60
UNYSPUSFUCD60
UNYSPUEFGCD60
UNYSPUEFTCD60
UNYSPUEFUCD60
UNYSPULFFCD60
UNYSPULFGCD60
UNYSPULFTCD60
UNYSPULFUCD60
UNYSPUMFGCD60
UNYSPUMFTCD60
UNYSPUMFUCD60
TLXCD3PL7JP45
TLXCD3PL7MP45
TLXCD3PL7PP45
TLXCDPL7JP45
TLXCDPL7MP45
TLXCDPL7MPC45
TLXCDPL7PP45
TLXABEOSPL7P
TLXABEOTPL7P
TLXLPL7FUZ34M
TLXLSDKCPL741M
TLXOSEDPL7PP45M
TLXOSPL7PP45M
TLXOTEDPL7MP45M
TLXOTPL7MP45M
TLXOTPL7PP45M
TLXRCD3PL7JP45M
TLXRCD3PL7MP45M
TLXRCD3PL7PP45M
TLXRCDPL7JP45M
TLXRCDPL7MP45M
TLXRCDPL7MPC45M
TLXRCDPL7PP45M
TLXUCD3PL7JP45M
TLXUCD3PL7PP45M
TLXUCDPL7JP45M
TLXUCDPL7PP45M
TLXV10PL7PP45M
TLXCDFCHMIV1M
TLXCDTCP50M
TLXCDWSBYP40E
SYCSPULFFCD2AM
SYCSPULFGCD2AM
SYCSPULFTCD2AM
SYCSPULFUCD2AM
SYCSPULRUCD2AM
UAGSEWLFUCD33
UAGSEWLFFCD33
UAGSEWLFUAL33
UAGSEWLVUCD33
EUSENG2CFUV11
UNYCSPSDUMBF
UNYCSPSDUMBT
UNYCSPSDUMBU
UNYCSPSDUMEF
UNYCSPSDUMET
UNYCSPSDUMEU
UNYSDUMFFCD20
UNYSDUMFTCD20
UNYSDUMFUCD20
UNYSPUZFUCD31E
UNYUSE40010V20E
UNYUSE40010V20F
UNYUDEVFUCD21E
990XCP99000
600558000
600545000
600544000
