控制規(guī)模主要指控制開關(guān)量的入、出點(diǎn)數(shù)及控制模擬量的模入、模出，或兩者兼而有之（閉路系統(tǒng)）的路數(shù)。但主要以開關(guān)量計(jì)。模擬量的路數(shù)可折算成開關(guān)量的點(diǎn)，大致一路相當(dāng)于8～16點(diǎn)。

依這個(gè)點(diǎn)數(shù)，PLC大致可分為微型機(jī)、小型機(jī)、中型機(jī)及大型機(jī)、型機(jī)。

微型機(jī)控制點(diǎn)僅幾十點(diǎn)，如德維森公司的V80系列PLC本體從16點(diǎn)到40點(diǎn)，OMRON公司的CPM1A系列PLC，西門子的Logo僅10點(diǎn)。

小型機(jī)控制點(diǎn)可達(dá)100多點(diǎn)。如如德維森公司的V80系列PLC可擴(kuò)展到256點(diǎn)，OMRON公司的C60P可達(dá)148點(diǎn)，CQM1達(dá)256點(diǎn)。德國西門子公司的S7-200機(jī)可達(dá)64點(diǎn)。

SQUARE D 250VDC 125A 3-POLE THERMAL MAGNETIC CIRCUIT BREAKER KHL36125

CUTLER HAMMER  2 POLE 120/240VAC 30AMP CIRCUIT BREAKER TYPE CH AL-CU

SQUARE D CIRCUIT BREAKER 1 POLE   RT-793 TYPE QO

SIEMENS 3A 230/400V CIRCUIT BREAKER  5SX21 C3

SQUARE D 20A SINGLE POLE CIRCUIT BREAKER  QO LP-8111

SIEMENS 4A 230/400V CIRCUIT BREAKER  5SX21 C4

ALLEN BRADLEY  CIRCUIT BREAKER 1P 240/415VAC 1492-SP1C005 SER. C

FUJI ELECTRIC  30A 600V 3 POLE CIRCUIT BREAKER  BU-ESB3030

MERLIN GERIN 20A TYPE C MULTI 9 CIRCUIT BREAKER  24435 / C60N

ALLEN BRADLEY  10A CIRCUIT BREAKER SER.C  1492-CB1H100

GE 20A 1-POLE CIRCUIT BREAKER  TQC1120 / KH-652

ALLEN BRADLEY CIRCUIT BREAKER 1492-CB3   IN BOX

ALLEN BRADLEY CIRCUIT BREAKER 1492- CB1 

CUTLER-HAMMER 3-POLE 80A INDUSTRIAL CIRCUIT BREAKER FD3080L

GENERAL ELECTRIC 3 POLE 30A CIRCUIT BREAKER E11592

ABB 480VAC 500VDC 3 POLE CIRCUIT BREAKER RV-2296

GENERAL ELECTRIC 1 POLE 20AMP TYPE THQB CIRCUIT BREAKER 

SQUARE D 3-POLE 20A THERMAL MAGNETIC CIRCUIT BREAKER FAL34020

SIEMENS 7.2A CIRCUIT BREAKER 50/60HZ 3VU1300-1ME00

GE CIRCUIT BREAKERS 1 POLE 120/240  NP1578013-P103

MITSUBISHI ELECTRIC 600VAC 75A 3-POLE CIRCUIT BREAKER NF100-CS NNB

MITSUBISHI CIRCUIT PROTECTOR CP30-BA AC 15AMP 3 POLE NNB

ALLEN BRADLEY  5A 1P CIRCUIT BREAKER 1489-A1C050

GE CIRCUIT BREAKER 20A 277VAC 1P E11592-D

SQUARE D CIRCUIT BREAKER  NE-2676 TYPE QO

SQUARE D CIRCUIT BREAKER 1 POLE   MG-6009 QO

CUTLER HAMMER  CIRCUIT BREAKER 3P 30A 600VAC 250VDC HMCPS030H1C

WESTINGHOUSE  80A 600VAC CIRCUIT BREAKER   FDB 14K / FDB3080L

SIEMENS 0.5A 230/400V SINGLE POLE CIRCUIT BREAKER  5SX21 C0.5

SIEMENS 6A 230/400V SINGLE POLE CIRCUIT BREAKER  5SX21 C6

SQUARE D CIRCUIT BREAKER 10 AMPS   AB-5004 TYPE QOB

SIEMENS 1A 400V CIRCUIT BREAKER 5SX22 C1

SQUARE D CIRCUIT BREAKER 1 POLE QOB   KD-150

ABB 8A 2-POLE CIRCUIT BREAKER  S272 KA8

WESTINGHOUSE TYPE BA 40A CIRCUIT BREAKER BAB3040H

CUTLER HAMMER 120/240VAC SINGLE POLE CIRCUIT BREAKER QCR1015

SIEMENS 3 POLE 30AMP 240VOLTS CIRCUIT BREAKER Q330

SIEMENS CIRCUIT BREAKER 1 POLE  Q92183

ALLEN BRADLEY CIRCUIT BREAKER 1498-CB2G400 SER B

AIRPAX LINE 9651 CIRCUIT BREAKER 219-6-4750-1

COIL-TRAN CORP TRANSFORMER 104X156CA016

SIEMENS 20A 1-POLE CIRCUIT BREAKER  QP L-4163

HEINEMANN 50A 2-POLE CIRCUIT BREAKER  2X0415

NO MANUFACTURE LABEL TRANSFORMER 150VA DGT-2238

SQUARE D 480V 50A 3 POLE CIRCUIT BREAKER, FA34050

SIEMENS SIRIUS MOTOR PROTECTOR CIRCUIT BREAKER  3RV1021-1CA10

ADVANCE POWRKUT RK-2S34-TP RAPID START HYBRID BALLAST