若主机单元的I/O数量不够用，可通过I/O扩展接口电缆与I/O扩展单元(不带CPU)相接进行扩充。 PLC还常配置连接各种外围设备的接口，可通过电缆实现串行通信、EPROM写入等功能。
编程器作用是将用户编写的程序至PLC的用户程序存储器，并利用编程器检查、修改和调试用户程序，监视用户程序的执行过程，显示PLC状态、内部器件及系统的参数等。
编程器有简易编程器和图形编程器两种。简易编程器体积小，携带方便，但只能用语句形式进行联机编程，适合小型PLC的编程及现场调试。图形编程器既可用语句形式编程，又可用梯形图编程，同时还能进行脱机编程。
Vogel Auto Lubrication System, MKU2-BWV2, 230V,
Cummins Oil Pump AR07054 PRJ3-FIR with CU445
Allen-Bradley 1491-N121 Fuse Block, Class H, 250V, 1 Pole 1-30 Amp
Gould Shawmut Tri-onic TRS45R Dual Element Current Limiting 600 VAC or less
Topworx DCD Go Switch Leverless Limit Switch Free Ship!
Fanuc PC Board, A16BA,
Fanuc AC Spindle Servo Unit, A06B-6052-H002, , 60 Day
Dormeyer Industries 4X893 Solenoid Free Shipping!
Grundfos Pump Unit, CM5-2 A-R-I-V-AQQV G-A-A-N, 24.8 GPM, AP1-1107
Mettler Toledo EB PLC Analog A/D & Controller Card
IA SuperSel Controller, Type G/AC, SEL-G-4-AC-200C. 200C.,
Fujikin FPR-SDAT-21-6.35UGF-AKH Valve SEALED
Electro-Craft BRU-500 Servo Drive Module, DM-150X, P/N Rev A, NO COVER
NUM Servomac AC Servo Motor, BMS L,
Magpower Magpowr GTSA25M 25kg Load Cell
Omron E3C-VS1G Photoelectric Switch Sensor
Analog Devices Type K Isolated Thermocoupler 7B37-K-02-1
Marathon RH60Q2L-15 Fuse Block QUANTITY AVAILABLE
Toshiba/Houston Tosvert-130G1 Variable Frequency Drive VFD VT130G1-2025BOE
Omron C120-OD411 3G2A6-OD411
Lg Qty Available Honeywell Sperry Stator Motor
AB Allen Bradley 1792D-OB4D I/O Module 11-25VDC/150MA 10-30VDC/4Amp 4Output
Parker PHC6ICP606S3M PH Check Valve
Mitsubishi PC Board, # BN624A524H01, FX701B, Revision A,
United Electric Controls H Pressure Switch H Free Ship!
Okuma OPUS Main Board, # EE,
Lincoln Electric G Circuit Board DC-600 Control PCB Free Shipping!
Yaskawa AC Servo Motor, USAFED-20FS2, w/ Encoder, UTMAH-B15B,
Seiki Keyboard Unit PC Board, # AB12C-S24,
Total Source B KOA Oil Seal
Siemens 6EP4134-0GB00-0AY0 Battery Module
Rexroth Indramat RMO04 RM-O-04 Module
Autocon Canbus Controller Board, # Off Hurco,
Qty Available OEM Lennox 83W12 VALVE-GAS (2 STG NAT)
Fanuc Model 1-OSP/3000 AC Servo Motor, # A06B-0373-B569 #7008,
Grundfos 90LA2-24F11 Immersible Pump, 3 HP (2.2 kW)
Omron CQM1-B7A13 PLC B7A I/F Unit 30 Day Warranty CQM1B7A13 Free Shipping!
Siemens 6ES5451-2CA11 Digital Output Module ET 200C 8DQ w/Warranty 6ES54512CA11
Schrader Bellows 1/4 Lev Spr Valve
