由于PLC采用了软件来取代继电器控制系统中大量的中间继电器、时间继电器、计数器等器件，控制柜的设计安装接线工作量大为减少。同时，PLC的用户程序可以在实验室模拟调试，更减少了现场的调试工作量。并且，由于PLC的低故障率及很强的监视功能，模块化等等，使维修也极为方便。
PP Westcode
HGSS1001 Mercury Wetted Relay
SKB30/12A1
SG3000GXH24 Tohsiba GTO thyristor module
TBY RECTIFIER 10 pc lot
N600CH12FOC Westcode SCR module
5STP3452X0003, ABB BRAND
R1280NS21K
Barksdale D1T-H2SS Vacuum or Pressure Activated Switch
QM50DX-H
JM
XCPG84M
3ASP1
W4DC45M
SKDHL100
01G-PKR
6SY7010-0AA47 SIEMENS BRAND
36RA160
R1279NS22J Westcode
SKIIP26NAB066V1 56A, 600V, N-CHANNEL IGBT
Control Engineering 32 Character Display Bd
BTW42-600R
GSR400V
H3CR-F8 VAC
GIC Thermodynamics RSL5.5SPT11803AA M36113 Thermocouple
Atlas Copco TC 52P 4240 0413 81 Power Macs Controller
N330SH25
HQ 10 pc lot min CII Midtex SPDT 10A 5600 Ohms
Lot of 10 Sylvania 19353 S11 7.5 Watt 120V Bulbs
N330CH24
5STP33L2800 ABB Thyristor
IFM Efector 110340 llK-2015-BABOA/SL/LS Proximity Sensor
LPS255-C