建中立恒自动化设备有限公司
1．输入/输出单元
输入/输出单元通常也称I/O单元或I/O模块，是PLC与工业生产现场之间的连接部件。
PLC通过输入接口可以检测被控对象的各种数据，以这些数据作为PLC对被控制对象进行控制的依据；同时PLC又通过输出接口将处理结果送给被控制对象，以实现控制目的。
由于外部输入设备和输出设备所需的信号电平是多种多样的，而PLC内部CPU的处理的信息只能是标准电平，所以I/O接口要实现这种转换。
I/O接口一般都具有光电隔离和滤波功能，以提高PLC的抗干扰能力。另外，I/O接口上通常还有状态指示，工作状况直观，便于维护。
PLC提供了多种操作电平和驱动能力的I/O接口，有各种各样功能的I/O接口供用户选用。I/O接口的主要类型有：数字量（开关量）输入、数字量（开关量）输出、模拟量输入、模拟量输出等。
常用的开关量输入接口按其使用的电源不同有三种类型：直流输入接口、交流输入接口和交/直流输入接口。
常用的开关量输出接口按输出开关器件不同有三种类型：是继电器输出、晶体管输出和双向晶闸管输出。
继电器输出接口可驱动交流或直流负载，但其响应时间长，动作频率低；而晶体管输出和双向晶闸管输出接口的响应速度快，动作频率高，但前者只能用于驱动直流负载，后者只能用于交流负载。
PLC的I/O接口所能接受的输入信号个数和输出信号个数称为PLC输入/输出（I/O）点数。I/O点数是选择PLC的重要依据之一。当系统的I/O点数不够时，可通过PLC的I/O扩展接口对系统进行扩展。
2．通信接口
PLC配有各种通信接口，这些通信接口一般都带有通信处理器。
PLC通过这些通信接口可与监视器、打印机、其它PLC、计算机等设备实现通信。
PLC与打印机连接，可将过程信息、系统参数等输出打印；与监视器连接，可将控制过程图像显示出来；与其它PLC连接，可组成多机系统或连成网络，实现更大规模控制。
与计算机连接，可组成多级分布式控制系统，实现控制与管理相结合。远程I/O系统也必须配备相应的通信接口模块。
3．智能接口模块
智能接口模块是一独立的计算机系统，它有自己的CPU、系统程序、存储器以及与PLC系统总线相连的接口。
它作为PLC系统的一个模块，通过总线与PLC相连，进行数据交换，并在PLC的协调管理下独立地进行工作。
PLC的智能接口模块种类很多，如：高速计数模块、闭环控制模块、运动控制模块、中断控制模块等。
Keystone KTLD-100-UV-24V LED Drivers
NSB DT223URK-NPS Safety Switches DT 2P 100A 240V 50/60Hz 1Ph Non Fusible 3
Jefferson Electric NSB 636-1113-600 Control Transformers 50A
Siemens NSB HNF362 Safety Switches HNF 3P 60A 600V 50/60Hz 3Ph Non Fusible 3Wire
GE TG3221 Safety Switches TG 2P 30A 240V 50/60Hz 1Ph Fusible 3Wire NEMA 1
GE TG3221 Safety Switches TG 2P 30A 240V 50/60Hz 1Ph Fusible 3Wire NEMA 1
GE NSB TGN3322 Safety Switches TGN 3P 60A 240V 50/60Hz 3Ph Non Fusible 3Wire
FSC Lighting VPL50-2C-030/036 LED Drivers
GE NSB TG4323R Safety Switches TG 3P 100A 240V 50/60Hz 3Ph Fusible 4Wire NEMA
GE NSB THN3321 Safety Switches THN 3P 30A 240V 50/60Hz 3Ph Non Fusible 3Wire NEM
NSB DG221URB Safety Switches DG 2P 30A 240V 50/60Hz 1Ph Non Fusible 2Wire
NSB DG321UGB Safety Switches DG 3P 30A 240V 50/60Hz 3Ph Non Fusible 3Wire
ELC-PS02 PLC Cables/Connectors/Accessories ELC Power Supply 2A 240V
NSB ELC-PS02 PLC Cables/Connectors/Accessories ELC Power Supply 2A 240V
DH362FRK Safety Switches DH 3P 60A 600V 50/60Hz 3Ph Fusible 3Wire N
NNB DH362FRK Safety Switches DH 3P 60A 600V 50/60Hz 3Ph Fusible 3Wire N
DH361NRK Safety Switches DH 3P 30A 600V 50/60Hz 3Ph Fusible w/ Neutral
NSB DH365NRK Heavy Duty Safety Switches DH 3P 400A 600V 50/60Hz 3Ph Fusibl
Square D NWD DU221RBUP Safety Switches
Square D NWD DU221RBUP Safety Switches
NSB DH361NRK Safety Switches DH 3P 30A 600V 50/60Hz 3Ph Fusible w/ Neutral
DH366NRK Heavy Duty Safety Switches DH 3P 600A 600V 50/60Hz 3Ph Fusibl
DH363UGK Safety Switches DH 3P 100A 600V 50/60Hz 3Ph Non Fusible 3Wire
NSB DH363UGK Safety Switches DH 3P 100A 600V 50/60Hz 3Ph Non Fusible 3Wire
NSB DG322NRB Safety Switches DG 3P 60A 240V 50/60Hz 3Ph Fusible w/ Neutral
NSB DG322NRB Safety Switches DG 3P 60A 240V 50/60Hz 3Ph Fusible w/ Neutral
NSB DG322URB Safety Switches DG 3P 60A 240V 50/60Hz 3Ph Non Fusible 3Wire
NSB DG222NRB Safety Switches DG 2P 60A 240V 50/60Hz 1Ph Fusible w/ Neutral
NSB DG222NRB Safety Switches DG 2P 60A 240V 50/60Hz 1Ph Fusible w/ Neutral
EatoTRM10A22D
D7PF3AT General Purpose Relay 15A 24V 50/60Hz 11 Blade
Wago NSB 788-412 Relay Accessories Relay Module
NSTCE012B10TD Other Contactors 3P 12A 24VDC B Frame 1NO
D2PAL Relay Accessories General Purpose Relay 8P 12A 300V 50/60Hz 8
Siemens NSB 3TH4293-0AK6
Idec SH4B-05 Relay Accessories
N-A201K1CAJ4 Other Contactors Open 3P 27A 120V 50/60Hz 3Ph 10HP Open
Marley NSB FR-R2
Allen Bradley NSB 700-R110A1
9-09061455P001 Other Contactors Open 4P 125A 130V G Frame
Carlo Gavazzi NSB RA4890HA12
Gould NSB 2190-E40AA-1-MOD-A
USTOM004AC1 Miniature 4A 1NO 1NC
Idec Izumi Corporation NSB RB11-PC Relay Accessories
Square D NSB 8501CO1V20
Idec Izumi Corporation NSB DMB51CM24
Square D NSB 8502SCO3V02
UNIVERSAL ENTERPRISE NSB UER341 Relay Accessories
Edwards Signaling NSB 5703B-301 Relay Accessories
Gould NSB 2190-E20BA-MOD-A
Furnas Electric 48HC37AA2
Westinghouse NSB MSH.5.5A Relay Accessories
PWC-D24 Relay Accessories 10PK
Allen Bradley NSB 700-P201A27
GE NSB CL00A310TJ Other Contactors 3P 25A 120V 50/60Hz 1NO
Gould NSB 2190-E80AA-MOD-A
Furnas Electric NSB 48GA17AR
D1RF1T 24VAC
C320KGS32 Auxiliary Contact Side Mounted 1NO 1NC
9575H3L000 DPDT 30A 24V
NSTCF020B00TD Other Contactors Non-Reversing 4P 24VDC
NNTCEXFAC20 Auxiliary Contact 2P 2.5A 500V
Ssac NSB TDR2B13 Solid State 10A 24V 102.3 Sec./ 10230 Sec.
Siemens NSB 3UA5000-1F
PT18M-A Timers and Time Switches
Square D NSB B22 Heater Packs and Elements
Idec RY4V-U-AC110
Siemens 3TX7002-4AG00 Relay Accessories
Furnas Electric NSB E74 Heater Packs and Elements
TMR5P05120 10A 120V .1-10 Sec.
NNTCE018C01A Other Contactors Non-Reversing 3P 37 50/60Hz
D7PA4 Relay Accessories 4P 10A 300V
Square D NSB LR1D32353A65
Gould NSB 2190-E80EA-MOD-A
SWD4-SML8-12
GENERAL ELECTRIC NSB CR120A04424AA
Gould NSB 2190-E53AA-MOD-A
B3NO-2 Overload Relay Alarm Kit 5A 600V
JGMPS100WA3D15Y2 Manual Motor Protectors JGMPS 3P 100A 690V 50/60Hz
CN15NN3C Other Contactors Non Reversing 3P 135A 480V Size 4
D3PR3R1 10A 12VDC
Agastat NSB SF-408882 120V
Westinghouse NSB FH52 Heater Packs and Elements
Square D NSB 8501KPD13P14V53 Relay Accessories
NNTCE050D00TD NEMA and IEC Contactors 3P 50A 27VDC D Frame
1 NNTCE050D00TD NEMA and IEC Contactors 3P 50A 27VDC D Frame
Potter & Brumfield NSB KRPA11AG-12V
FAZ-C1.5/2-NA Miniature Circuit Breakers (MCBs) FAZ 2P 1.5A 277V 50/60
BFF11G 2P 300V 50/60Hz 1NO 1NC
ECL03C1A9A Lighting Contactors Lighting Contactor 9P 30A 120V 50/60Hz
Cutler-Hammer NSB HFD3020L Relay Accessories NULL
Siemens NSB 3UA5000-1G
1 Siemens NSB 3UA5000-1G
Struthers-Dunn NSB A311XBXP
1 Struthers-Dunn NSB A311XBXP
MSLG Starter and Contactor Accessories Padlock Handle Guard NEMA 1
Square D NSB RSX-24L
TE Connectivity 27E867 Relay Accessories
MT3700T Trip Units MT 3P 700A 600V 50/60Hz
ark RH2B-UDC24V
MOD-AMV120 Relay Accessories
Struthers-Dunn NSB B1XBX
Idec RF1V-2A2BL-D24
D5PF3AT1
DP2A4
NSTCE025C10B Other Contactors 3P 25A 240V C Frame
D3RF3B
Square D NSB 9050JCK45V20
Potter & Brumfield NSB KRP14DG
Idec RR3PA-UAC120V
Square D 9050-BO5EV02
Siemens NSB 3TH2022-0AC2
Square D CC112 Relay Accessories
CN15GN3TB Other Contactors 3P 45A 24V 60Hz Size 2 Size 2 1NO
Siemens NSB 3UA5400-1G
Potter & Brumfield NSB KRP11DG
Edwards NSB SIGA-CRH
NNTMCXFA40 Starter and Contactor Accessories Auxiliary Contact Blocks 4
Furnas Electric 46MTB20 Relay Accessories
Carlo Gavazzi NSB RHS45A
Square D NSB 9050JCK21V14
NSTCE012B01D Other Contactors Non-Reversing 3P 12A 600V 50/60Hz
Socomec 49413602 30A 125V 50/60Hz 5W Time Delay: 0-10s
Pilz PU3Z-24VDC-3N/O-1N/C-6SO
Gould NSB 2190-E53AA-M0D
9575H3T010 DPDT 24VDC
Carlo Gavazzi NSB RN1A48D20U
RK Industries CSB-115A-4-3S
Idec NSB SJ2S-05BW Relay Accessories
D3RR3A
Furnas Electric 48ASD1M20
QBHW2060 Miniature Circuit Breakers (MCBs) 2P 60A 240V
Cutler-Hammer NSB D40RR40A1
Idec SH3B-05 Relay Accessories
1 Idec SH3B-05 Relay Accessories
C320KGS1 Auxiliary Contact Single Pole 1P 6A 600VAC 1NO Side Mounti
Gould NSB 2190-E42BA-MOD-A
Magnecraft NSB W97CPX-1
Struthers-Dunn NSB 219XBXP 120V SERIES 219
Carlo Gavazzi NSB RHS100
10177H-1019A Relay Accessories
Crouse Hinds NSB TMR5N05120 120VAC
65A7001G01 Pump Accessories Anti-Pump Relay 24V w/ W-VACiMB
Lumisys LP-TR-1
Siemens NSB 3UA6200-3L
A2X1LPK Other Sensors and Switches 600V 50/60Hz F Frame
Square D 9050-BO26E-V02
Furnas Electric NSB 46MTB20 Relay Accessories
Cutler-Hammer D4PR21A1
D3RR3T1
Carlo Gavazzi NSB RA2425HA06
S511E10N3D Other Contactors 3P 10A 480V 50/60Hz 1NO 1NC
Siemens NSB 3UA7020-0E
WAL1A1B Auxiliary Contact
Gould NSB 2190-E42AA-MOD-A
MOD-AMV120 Relay Accessories
D26MR202A 2P 600V 2NO 0NC
D26MBA
Square D NSB 8501XO-20
Carlo Gavazzi NSB RM1A48D75
Square D NSB 9065-CO-1R
H2011B-3 Heater Packs and Elements 9.14-14.0A
D5RF3A
Idec NSB RR3PA-UAC240V
Potter & Brumfield NSB KHS-17D11-6
NSTRE10B22A Contactor Relay 4P 10A 120V 50/60Hz b 2NO 2NC
CLARK EQUIPMENT NSB 2N140-76
Omron NSB K8AK-VS224VAC/DC
Hubbell NSB RFSQ2FDK Other Sensors and Switches Fan & Light Wall Control 1.5A 12
Siemens 3UA5400-2D
9575H3E000 DPDT 5A 208V
9575H3S000
H2024-3 Heater Packs and Elements 106.0-144.0A 3
Siemens NSB SFH40 Heater Packs and Elements