PLC可分为箱体式及模块式两大类。微型机、小型机多为箱体式的，但从发展趋势看，小型机也逐渐发展成模块式的了。如OMRON公司，原来小型机都是箱体式，现在的CQM1则为模块式的。

箱体的PLC把电源、CPU、内存、I/O系统都集成在一个小箱体内。一个主机箱体就是一台完整的PLC，就可用以实现控制。控制点数不符需要，可再接扩展箱体，由主箱体及若干扩展箱体组成较大的系统，以实现对较多点数的控制。

模块式的PLC是按功能分成若干模块，如CPU模块、输入模块、输出模块、电源模块等等。大型机的模块功能更单一一些，因而模块的种类也相对多些。这也可说是趋势。目前一些中型机，其模块的功能也趋于单一，种类也在增乡。如同样OMRON公司C20系列PLC，H机的CPU单元就含有电源，而Ha机则把电源分出，有单独的电源模块。

模块功能更单一、品种更多，可便于系统配置，使PLC更能物尽其用，达到更高的使用效益。

由模块联结成系统有三种方法：

①无底板，靠模块间接口直接相联，然后再固定到相应导轨上。德维森公司的V80系列PLC就是这种结构，比较紧凑。

②有底板，所有模块都固定在底板上。如德维森公司的PPC11、PPC22和PPC31系列PLC，OMRON公司的C200Ha机，CV2000等中、大型机就是这种结构。它比较牢固，但底板的槽数是固定的，如3、5、8、10槽等等。槽数与实际的模块数不一定相等，配置时难免有空槽。这既浪费，又多占空间，还得占空单元把多余的槽作填补。

③用机架代替底板，所有模块都固定在机架上。这种结构比底板式的复杂，但更牢靠。一些特大型的PLC用的多为这种结构。

ACE CONTROLS SHOCK ABSORBER MC600 PSI

ARO PNEUMATIC AIR POWERED ELECTRODE DRESSER TOOL MODEL 8040

NUMATICS F30B-04AC / C30D-04ACG PNEUMATIC FILTERS NNB

BIMBA FOD-501 PNEUMATIC CYLINDER NNB

UNKNOWN MANUFACTURER * BUTTON HEAD GREASE FITTING * UNKNOWN

NUMATICS R22R-04G REGULATOR, NNB

NUMATICS 120V, 50/60Hz, 150PSIG, SOLENOID VALVE 081SS400K000030

UNKNOWN MANUFACTURER * SS HEX HEAD BUSHING ASSORTED * UNKNOWN

PARKER 250PSI BORE-3.25 STR-12.000 PNEUMATIC CYLINDER CJAUS13C

MAC 110/120V 26.8W 50/60HZ 150 PSI PNEUMATIC SOLENOID VALVE COIL, PID-111CAAA

PARKER * PNEUMATIC CYLINDER * 32CBCMPRS14MC

BIMBA PNEUMATIC CYLINDER 174-DP

NUMATICS AIR CYLINDER 08-28733

MAGNATROL 120V 60Hz SOLENOID VALVE 14L32-ZM

YUKEN HYDRAULIC CYLINDER CJT70-FA32B370B?-BDA 11 A

NUMATICS 150 PSIG SOLENOID VALVE 122BB572MN00061

FESTO CPV14-VI N702 DISTRIBUTION MANIFOLD NO CONNECTOR PLATE

FESTO 40mm BORE 400mm STROKE PNEUMATIC CYLINDER DNG-40-400-PPV-?A

PHD SKC74 X 205 -DB-PB CYLINDER 06634821-02 NNB

DRAIN-ALL SERIAL 40420 COMPRESSED PNEUMATIC AIR DRAIN TRAP LIQUID VALVE 1500

FESTO 180 PSI 100MM BORE 100MM STROKE PNEUMATIC CYLINDER, DNG-100-100-PPV?-A, NNB

TRABON / LUBRIQUIP 0.015IN3 (0.246CM3) MODULAR DIVIDER VALVE MSP-15T

FESTO 50MM BORE 100MM STROKE PNEUMATIC CYLINDER, DNC-50-100-PPV-?A, NNB

FESTO 40MM BORE 125MM STROKE PNEUMATIC CYLINDER, DNU-40-125PPV-A?, NNB

BELLOWS-VALVAIR LTD AIR CYLINDER B0511 0041 70

PNEUTRONICS DIGITAL PNEUMATIC CONTROL BOARD 990-004765-011

NUMATICS 120V .12A 150 PSIG-AIR SOLENOID VALVE W/ BASE, 082SA43AK

NUMATICS 150 PSIG-MAX SOLENOID VALVE ISO5599/11 / I34BB400KP14D

ZIMMER PNEUMATIC CLAMPING ELEMENT MKS3501A NIB

NUMATICS 24VDC 6.0W PNEUMATIC SOLENOID VALVE 225-372B

YUKEN HYDRAULIC CYLINDER CJT70-FA32B31B-?ABA-EK

SMC CYLINDER CDNAFN63N-220-D

PARKER SCHRADER BELLOWS 150PSI SOLENOID COIL NNB AL41533BJN5300B 103644

AEROQUIP A-T-J DIVISION HYDRAULIC CYLINDER TE22CAXD

ROTAC ROTARY ACTUATOR DUEL SHAFT LP-24-IV

NUMATICS LINEAR SLIDE LC10602H16DXX

BOSCH PNEUMATIC STOP GATE 3842 525 109 *NNB*

SMC JAF140-30-150 FLOATING JOINT, NIB

SMC PNEUMATIC CYLINDER CNDAFN80N-125-D

PARKER K065 N035 PILOT VALVE, NNB

NUMATICS .916" NPT FILTER F30B-06

SMC CYLINDER CLAFN80-75-D-XC?18

SMC PNEUMATIC CYLINDER MYH32-K5232-400

FESTO 63MM BORE 300MM STROKE PNEUMATIC CYLINDER, DNC-63-300-PPV-?A-KP, NNB

ASCO 24DC-FT 11.2W SOLENOID N262.444 E / 400-425-142

NUMATICS 100-120V .30A 150 PSIG-AIR SOLENOID VALVE, I35SA415K

PARKER HYDRAULIC FILTER 926988Q NIB

EATON AEROQUIP FJ9122-1212 37JIC FEMALE SWIVEL ,NNB

BIMBA PNEUMATIC CYLINDER 245-DP

DEZURIK CYLINDER ACTUATOR 941816R001 44482

HOWA ROTATING HYDRAULIC CHUCK CYLINDER HH11C 80

PMV 800kPA ELECTRO-PNEUMAT?IC DOUBLE ACTING VALVE POSITIONER P-2020 NIB

WHITEY 200PSI MAX 90 PNEUMATIC SPRING RETURN ACTUATOR 133 SR W/ MB-133

CMT 80 PSI, 2.5" STROKE DOUBLE ACTING IMPACT MARKER 288SUBK.OB.25.R

YUKEN CYLINDER CJT70-TC40B320B?-ABA-EK 20A

PARKER SCHRADER BELLOWS 24 VDC SOLENOID PNEUMATIC VALVE W2154L579B

YUKEN HYDRAULIC CYLINDER CJT70-FA32B325B?-BCB-EK 20A

FESTO PNEUMATIC CYLINDER DZH-50-200PPV-A

NUMATICS 120V, .16A, 50/60Hz, SOLENOID VALVE 554BB43AK

PHD PNEUMATIC PARALLEL GRIPPER 7980-03-0201

FESTO CYLINDER DKE-100-350-PPV?-A

NUMATICS 24VDC 4.0W 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I24BB415MP56Y

NUMATICS 110/120V .06A 150 PSIG-AIR DOUBLE SOLENOID VALVE, I34BB400KP14D

MAC 24VDC 2.5W 25-150 PSI PNEUMATIC SOLENOID VALVE, 6313D-611-PM-59?1DA

PARKER PNEUMATIC 150PSI 1000KPA FILTER/REGULATO?R 07F41BC 104112

ENERPAC STLS-121 2400LB THREADED BODY SWING CYLINDER, NNB

CKD SSD-ML-40-40 PNEUMATIC CYLINDER

PARKER E-43-B-0500 INSTRUMENT GRADE POLYETHYLENE TUBING .170" X 500', NIB

NUMATICS 110/120V .08A SOLENOID VALVE, 237-325B

SMC CYLINDER CDLAFN100-175-E

BIMBA SS PNEUMATIC CYLINDER SS311-R

PARKER * SAE CODE 61 FLANGE HEAD * 11571-16-16

NUMATICS SOLENOID AIR PILOT ACTUATED VALVE R20BB500MP00061 / R20BBD00MP00061

SMC 3.5MPa PNEUMATIC CYLINDER CHDAL40-400-J59?WL

INTEGRAL HYDRAULIK HYDRAULIC CYLINDER1009882?1 160BAR 018-1354-062-00?3

NUMATICS 238610 110/120V 50/60HZ SOLENOID VALVE COIL, MP-C-080-032-D

MILCO PNEUMATIC CYLINDER CCC-204-4.0 REV B 100712

90 BRASS ELBOW ASSORTMENT, LOT OF 9

NUMATICS SERIES ISO5599/11 150 PSIG SOLENOID VALVE I24BB415MP

PARKER JIC P 16 SS FLUID CONNECTING NUT, LOT OF 17

HYDRAULIC THREAD NUT HMV 134/A-101