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用PLC实现对系统的控制是非常可靠的。这是因为PLC在硬件与软件两个方面都采取了很多措施，确保它能可靠工作。事实上，如果PLC工作不可靠，就无法在工业环境下运用，也就不成其为PLC了。
1·在硬件方面：
PLC的输入输出电路与内部CPU是电隔离。其信息靠光耦器件或电磁器件传递。而且，CPU板还有抗电磁干扰的屏蔽措施。故可确保PLC程序的运行不受外界的电与磁干扰，能正常地工作。
PLC使用的元器件多为无触点的，而且为高度集成的，数量并不太多，也为其可靠工作提供了物质基础。
在机械结构设计与制造工艺上，为使PLC能安全可靠地工作，也采取了很多措施，可确保PLC耐振动、耐冲击。使用环境温度可高达摄氏50多度，有的PLC可高达80--90度。
有的PLC的模块可热备，一个主机工作，另一个主机也运转，但不参与控制，仅作备份。一旦工作主机出现故障，热备的可自动接替其工作。
还有更进一步冗余的，采用三取一的设计，CPU、I/O模块、电源模块都冗余或其中的部分冗余。三套同时工作，*终输出取决于三者中的多数决定的结果。这可使系统出故障的机率几乎为零，做到万无一失。当然，这样的系统成本是很高的，只用于特别重要的场合，如铁路车站的道叉控制系统。
2．在软件方面：
PLC的工作方式为扫描加中断，这既可*保*它能有序地工作，避免继电控制系统常出现的"冒险竞争"，其控制结果总是确定的；而且又能应急处理急于处理的控制，*保*了PLC对应急情况的及时响应，使PLC能可靠地工作。
为监控PLC运行程序是否正常，PLC系统都设置了"看门狗"（Watchingdog）监控程序。运行用户程序开始时，先清"看门狗"定时器，并开始计时。当用户程序一个循环运行完了，则查看定时器的计时值。若超时（一般不超过100ms），则报警。严重超时，还可使PLC停止工作。用户可依报警信号采取相应的应急措施。定时器的计时值若不超时，则重复起始的过程，PLC将正常工作。显然，有了这个"看门狗"监控程序，可*保*PLC用户程序的正常运行，可避免出现"死循环"而影响其工作的可靠性。
PLC还有很多防止及检测故障的指令，以产生各重要模块工作正常与否的提示信号。可通过编制相应的用户程序，对PLC的工作状况，以及PLC所控制的系统进行监控，以确保其可靠工作。
PLC每次上电后，还都要运行自检程序及对系统进行初始化。这是系统程序配置了的，用户可不干预。出现故障时有相应的出错信号提示。
正是PLC在软、硬件诸方面有强有力的可靠性措施，才确保了PLC具有可靠工作的特点。它的平均无故障时间可达几万小时以上；出了故障平均修复时间也很短，几小时以至于几分钟即可。
曾有人做过为什么要使用PLC的问卷调查。在回答中，多数用户把PLC工作可靠作为选用它的主要原因，即把PLC能可靠工作，作为它的选指标。
949-07-15240 INVERTER SET
B836E0163-2-2 GPD402 .75H/ 230
B836E0163-3-1 GPD402 .75H/ 230
B836E0165 JUSPEED-F BOARD
CA133-3 F/ V CONVERTER
CA141-1 DUAL POWER SUPPLY
CA224 ISOLATION BOARD
CACR-15-YU1 SERVO PACK
CACR-1R44SFB PCB
CACR-IR151515EB SERVOPACK CONTROL
CACR-IR151515FB SERVOPACK CONTROL
CACR-PR02AA4AH SERVOPACK CONTROL
CACR-SR01AC1ER 100W 200V SERVO
CACR-SR02AC1ER 200W 200V SERVO
CACR-SR03AC1ER 300W 200V SERVO
CACR-SR03AC2ER 300W 100V SERVO
CACR-SR03BB1AF SERVOPACK CONTROL
CACR-SR03BB1AM SERVOPACK CONTROL
CACR-SR03BB1CS SERVOPACK CONTROL
CACR-SR05AC1ER 500W 200V SERVO
CACR-SR05AC1FR 500W 200V SERVO
CACR-SR05AZ1SR SERVOPACK CONTROL
CACR-SR05BB1BF SERVOPACK CONTROL
CACR-SR05BB1ES SERVOPACK CONTROL
CACR-SR07AC1ER 700W 200V SERVO
CACR-SR07BB1AM SERVOPACK CONTROL
CACR-SR07BB1BM SERVOPACK CONTROL
CACR-SR10BB1AF SERVOPACK CONTROL
CACR-SR10BB1AM SERVOPACK CONTROL
CACR-SR10BB1BF SERVOPACK CONTROL
CACR-SR10BB1CS SERVOPACK CONTROL
CACR-SR10BE12F SERVOPACK CONTROL
CACR-SR10BE12G SERVOPACK CONTROL
CACR-SR10SZ1SF SERVOPACK CONTROL
CACR-SR12baseRVOPACK CONTROL
CACR-SR15BB1AM SERVOPACK CONTROL
CACR-SR15BB1BF SERVOPACK CONTROL
CACR-SR15BB1BM SERVOPACK CONTROL
CACR-SR15BB1CS SERVOPACK CONTROL
CACR-SR20BB1AF SERVOPACK CONTROL
CACR-SR20BB1AM SERVOPACK CONTROL
CACR-SR20BB1BF SERVOPACK CONTROL
CACR-SR20BE12G SERVOPACK CONTROL
CACR-SR20TB6BM SERVOPACK CONTROL
CACR-SR30BB1AM SERVOPACK CONTROL
CACR-SR30BE12G SERVOPACK CONTROL
CACR-SR30SB1ASY SERVOPACK CONTROL
CACR-SR30SB1BSY SERVOPACK CONTROL
CACR-SR44BB1AF SERVOPACK CONTROL
CACR-SR44BB1AM SERVOPACK CONTROL
CACR-SR44SZ1SDY SERVOPACK CONTROL
CACR-SR60BB1AM SERVOPACK CONTROL
CACR-SRA5AC1ER 50W 200V SERVO
CACR-W37-FJ2BER AC SERVOPACK
CACR-W37-FJ2ER AC SERVOPACK
CDBR-4045 60HP 460V BRAKE
CDBR-4045B 60HP 460V BRAKE
CDBR-4220 300H 460V BRAKE
CDBR-4220B 300H 460V BRAKE
CDBR-H45H 616H BRAKE UNIT
CDMR-ZII VARISPEED 505
CIMR-0.4B .5HP HII DRIVE
CIMR-0.4G2 .5HP 230V AC DRIVE
CIMR-0.75B 1HP HII DRIVE
CIMR-0.75B.501 1HP HII DRIVE
CIMR-0.75G2 1HP 230V AC DRIVE
CIMR-0.75G2-20 1HP 230V AC DRIVE
CIMR-04AS3 .75H 230V AC DRIVE
CIMR-08AS3 1HP 230V AC DRIVE
CIMR-08AS4 1HP 230V AC DRIVE
CIMR-08CS2-1019 1HP 230V AC DRIVE
CIMR-11B 15HP HII DRIVE
CIMR-11G2 15HP 230V AC DRIVE
CIMR-15AS2 2HP 220V AC DRIVE
CIMR-15AS3 2HP 230V AC DRIVE
CIMR-15AS3-0020 2HP 230V AC DRIVE
CIMR-15B 20HP HII DRIVE
CIMR-15G2 20HP 230V AC DRIVE
CIMR-18.5B 30HP HII DRIVE
CIMR-18.5G2 25HP 230V AC DRIVE
CIMR-2.2B 3HP HII DRIVE
CIMR-2.2G2 3HP 230V AC DRIVE
CIMR-2.2G2-E20 3HP 230V AC DRIVE
CIMR-22AS2 3HP 220V AC DRIVE
CIMR-22B 30HP HII DRIVE
CIMR-22CS2-1019 3HP 460V AC DRIVE
CIMR-22G2 30HP 230V AC DRIVE
CIMR-3.7B 5HP HII DRIVE
CIMR-3.7B-C04 5HP HII DRIVE
CIMR-3.7G2 5HP 230V AC DRIVE
CIMR-3.7G2LN-20 5HP 230V AC DRIVE
CIMR-3.7TW 5HP HII DRIVE
CIMR-30B 50HP HII DRIVE
CIMR-30G2 40HP 230V AC DRIVE
CIMR-37AS2 5HP 220V AC DRIVE
CIMR-37AS3 5HP 230V AC DRIVE
CIMR-37B 50HP HII DRIVE
CIMR-37C 5HP HII DRIVE
CIMR-45B 60HP HII DRIVE
CIMR-5.5B 7.5HP HII DRIVE
CIMR-5.5B/ JOHB 7.5HP HII DRIVE
CIMR-5.5G2 7.5H 230V AC DRIVE
CIMR-5.5G2-E10 7.5H 230V AC DRIVE
CIMR-55B 75HP HII DRIVE
CIMR-7.5B 10HP HII DRIVE
CIMR-7.5G2 10HP 230V AC DRIVE
CIMR-7.5G2-10 10HP 230V AC DRIVE
CIMR-7.5TW 10HP HII DRIVE
CIMR-7.5TW1 10HP HII DRIVE
CIMR-E7U4030 50HP 460V AC DRIVE
CIMR-F08AS2 1HP 460V AC DRIVE
CIMR-F08AS2/ SIF 1HP AC DRIVE W/ OPT
CIMR-F08AS3 1HP 460V AC DRIVE
CIMR-F08AS4 1HP 460V AC DRIVE
CIMR-F10AS2/ SIF 1.5H AC DRIVE W/ OP
CIMR-F15AS2 2HP 460V AC DRIVE
CIMR-F15AS3 2HP 460V AC DRIVE
CIMR-F15AS4 2HP 460V AC DRIVE
CIMR-F22AS2 3HP 460V AC DRIVE
CIMR-F22AS3 3HP 460V AC DRIVE
CIMR-F37AS2 5HP 460V AC DRIVE
CIMR-F37AS3 5HP 460V AC DRIVE
CIMR-F55AS2 7.5H 460V AC DRIVE
CIMR-F75AS2 10HP 460V AC DRIVE
CIMR-F7C4022 30HP 460V AC DRIVE
CIMR-F7C4030 40HP 460V AC DRIVE
CIMR-F7U4045 60HP 460V AC DRIVE
CIMR-F7U47P5 10HP 460V AC DRIVE
CIMR-G04AS2 .75H 230V AC DRIVE
CIMR-G08AS2 1HP 230V AC DRIVE
CIMR-G08AS2-1 1HP 230V AC DRIVE
CIMR-G15AS2 2HP 230V AC DRIVE
CIMR-G22A-20 3HP JUSPEED-F
CIMR-G22AS2 3HP 230V AC DRIVE
CIMR-G37AS2 5HP 230V AC DRIVE
CIMR-G3A2011 15HP 230V AC DRIVE
CIMR-G3A2015 20HP 230V AC DRIVE
CIMR-G3A20P4 .5HP 230V AC DRIVE
CIMR-G3A20P7 1HP 230V AC DRIVE
CIMR-G3A22P2 3HP 230V AC DRIVE
CIMR-G3A23P7 5HP 230V AC DRIVE
CIMR-G3A25P5 7.5H 230V AC DRIVE
CIMR-G3A27P5 10HP 230V AC DRIVE
CIMR-G3A4015 20HP 460V AC DRIVE
CIMR-G3A4030 40HP 460V AC DRIVE
CIMR-G3A4045 60HP 460V AC DRIVE
CIMR-G3A40P4 .5H 460V AC DRIVE
CIMR-G3A43P7 5HP 460V AC DRIVE
CIMR-G3A45P5 7.5H 460V AC DRIVE
CIMR-G3E4015 20HP 460V AC DRIVE
CIMR-G3M23P7 5HP 230V AC DRIVE
CIMR-G3S21P5 2HP 230V AC DRIVE
CIMR-G3S22P2 3HP 230V AC DRIVE
CIMR-G3S27P5 10HP 230V AC DRIVE
CIMR-G3S40P7 1HP 460V AC DRIVE
CIMR-G3S41P5 2HP 460V AC DRIVE
CIMR-G3S42P2 3HP 460V AC DRIVE
CIMR-G3S43P7 5HP 460V AC DRIVE
CIMR-G3U2011 15HP 230V AC DRIVE
CIMR-G3U2015 20HP 230V AC DRIVE
CIMR-G3U2018 25HP 230V AC DRIVE
CIMR-G3U2022 30HP 230V AC DRIVE
CIMR-G3U20P4 .5HP 230V AC DRIVE
CIMR-G3U20P7 1HP 230V AC DRIVE
CIMR-G3U22P2 3HP 230V AC DRIVE
CIMR-G3U23P7 5HP 230V AC DRIVE
CIMR-G3U25P5 7.5H 230V AC DRIVE
CIMR-G3U27P5 10HP 230V AC DRIVE
CIMR-G3U4011 15HP 460V AC DRIVE
CIMR-G3U4015 20HP 460V AC DRIVE
CIMR-G3U4018 25HP 460V AC DRIVE
CIMR-G3U4022 30HP 460V AC DRIVE
CIMR-G3U4030 40HP 460V AC DRIVE
CIMR-G3U4037 50HP 460V AC DRIVE
CIMR-G3U4045 60HP 460V AC DRIVE
CIMR-G3U40P4 .5HP 460V AC DRIVE
CIMR-G3U40P7 1HP 460V AC DRIVE
CIMR-G3U41P5 2HP 460V AC DRIVE
A-B 1794-ACN15 3 PLC
A-B 1794-IB16 3 PLC
A-B 1794-IE8 3 一体化PLC PLC
A-B 1794－IR8 3 一体化PLC PLC
A-B 1794-IT8 3 一体化PLC PLC
A-B 1794-OB16 3 存储器盒 PLC
A-B 1794-OE4 3 一体化PLC PLC
A-B 1794-TB3 5 一体化PLC PLC
A-B 1794IE8XOE4
5 PLC
1785-L40C15
1785-L46C15
1785-L80C15
1785-ENET
1785-L20E
1785-L80E
1756-ENBT
1756-L63 LOGIX555 处理器模块
1756-L62 LOGIX5555 处理器模块 2M内存
1756-L55M14 LOGIX5555处理器模块 3.5M内存
1756-A7 7槽机架
1756-PA75 85-265VAC电源
1756-PA75R 85-265VAC冗余电源
1756-IB16 10-31VDC16点输入模块,20针
1747-L541 SLC5/04处理器模块,16K内存,DH+和DH-485/RS232口
1746-NI8 模拟量输入模块 8路差分
1746-P2 220VAC 5A电源
1746-OB16 24VDC/0.5A 16点输出模块 源流
1746-M13 64K FLASH存储模块
1746-NI16I 模拟量输入模块 16路+/-20MA
1756-ENBT 以太网通信接口模块
1756-L55 LOGIX5555PROCESSORWITHNOUSERMEMORY
1756-L55M12 LOGIX5555PROCESSORWITH750KBYTEMEMORY
1756-L55M13 LOGIX5555PROCESSORWITH1.5MBYTEMEMORY
1756-L55M14 LOGIX5555PROCESSORWITH3.5MBYTEMEMORY
1756-L55M16 LOGIX5555PROCESSORWITH7.5MBYTEMEMORY
1756-L55M22 LOGIX5555PROCESSORWITH750KBYTENVMEMORY
1756-L55M23 LOGIX5555PROCESSORWITH1.5MBYTENVMEMORY
1756-L55M24 LOGIX5555PROCESSORWITH3.5MBYTENVMEMORY
1756-L60M03SE LOGIX5560M03SEWITHSERCOS3-AXIS750KBYTESMEMORY
1756-L61 LOGIX5561PROCESSORWITH2MBYTEMEMORY
1756-L62 LOGIX5562PROCESSORWITH4MBYTEMEMORY
1756-L63 LOGIX5563PROCESSORWITH8MBYTEMEMORY
1747-L511 SLC5/01CONTROLLER,1KMEMORY-DH485
1747-L514 SLC5/01CONTROLLER,4KMEMORY-DH485
1747-L524 SLC5/02CONTROLLER,4KMEMORY-DH485
1747-L531 SLC5/03,WITH8KUSERINSTRUCTIONCAPACITY
1747-L532 SLC5/03CONTROLLER,16KMEMORY
1747-L541 SLC5/04CONTROLLER,16KMEMORY
1747-L542 SLC5/04CONTROLLER,32KMEMORY
1747-L542P PRO-SET200-5/04-32K
1747-L543 SLC5/04CONTROLLER,64KMEMORY
1747-L543P PRO-SET200-5/04-64K
1747-L551 SLC5/05CONTROLLER,16K
1747-L552 SLC5/05CONTROLLER,32K
1747-L553 SLC5/05CONTROLLER64K
1747-L553P PRO-SET200-5/05-64K
现货特价供应1756L55M24，1756L55M22，1756L55，1756L55M12，1756L55M13，1756L55M14，1756L55M16，
1756L55M22，1756L55M23， 1756L55M24
1797-IBN16
1797-OB4D
1797-IE8
1797-IE8H
1797-IE8NF
1797-IRT8
1797-OE8
1797-OE8H
1797-IJ2
1797-BCNR
1797-BIC
1797-BOOT
1797-CE1S
1797-CE3S
1797-CEC
1797-EXMK
1797-INS
1797-RPA
1797-RPFM
1797-TCAP
1797-TPR
1797-TPS
1797-TPYR
1797-TPYS
1797-XT
1797-PS1E1797-PS1N1797-PS2E21797-PS2N2
1797-TB3
1797-TB3S
1797-ACNR15
1794-CJC2
1794-N2
1794-NM1
1794-CE1
1794-CE3
1799-BRKD
1799-D10U10B
1799-D10U10BL
1799-D10U10V
1799-D10U10VL
1799-D16U16B
1799-D16U16BL
1799-D16U16V
1799-D16U16VL
1799-ZCIOB
1799-ZCIOV
1799-12SPCON
1799-AUXCON
1799-DNC5MMS
1799-DNETCON
1799-DNETSCON
1799-DSCCON
1799-DSSCON
1799-COV20
1799-COV32
1799-MP20
1799-MP32
9323-1003ENE
9323-ATUNEENE
6556-MLCBKDC
6556-PA00M3
6556-PA00M5
6556-PA0PK
6556-PA0PM
6556-PA0PM1
6556-PA0PM3
6556-PA0PM4
6556-PS0PM3
6556-PSH0M
6556-SCBM44
6556-SDM
6556-SDTAM
6556-SPAKS
6556-SPLS
6556-SPV550
6556-SPV600
1757-FFLD2
1757-FFLD4
1757-FFLDC2
1757-FFLDC4
1788-CN2FF
1788-FFCT
1784-CP10
1784-CP11
2760-A485
2760-SFC1
2760-SFC2
1769-ADN
1770-KFD
1770-KFDG
1784-PCD
1784-PCD1
1784-PCID
1784-PCIDS
1787-MCABL
1787-PCABL
1787-PLUG10R
1787-RSCABL
1787-TCABL
1787-USADPTR
1788-DNBO
1770-KFC15
1784-DPC1
1784-KTCX15
1784-PCC
1784-PCC1
1784-PCIC
1784-PCICS
1786-CP
1788-CN2DN
1788-CNC
1788-CNCR
1788-CNF
1788-CNFR
1761-NET-ENI
1761-NETENIW
1785-TAM
1785-TAS
1785-TBM
1785-TBS
1785-TR10B2
1785-TR10B5
1785-TR10BF
1788-EN2DN
1788-ENBT
6628-A5
1770-CD1
1770-CD10
1770-CD2
1770-CD3
1770-CD4
1770-CD5
1770-CD6
1770-CD7
1770-CD8
1770-CD9
1770-CG
1770-CP
1770-KF2
1770-SC
1770-XE
1770-XF
1770-XG
1771-KE
1771-KF
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