1606-XL480E-3處理板
大、中型plc(如西門子的s7-300和s7-400系列)一般采用模塊式結(jié)構(gòu)。模塊式plc用搭積木的方式組成系統(tǒng)，它由機(jī)架和模塊組成(見圖2-2)。模塊插在模塊插座上，后者焊在機(jī)架的總線連接板上，有的廠家將機(jī)架稱為基板。plc廠家備有不同槽數(shù)的機(jī)架供用戶選用，如果一個(gè)機(jī)架容納不下所選用的模塊，可以增設(shè)一個(gè)或數(shù)個(gè)擴(kuò)展機(jī)架，各機(jī)架之間用i/o擴(kuò)展電纜相連，有的plc需要通過接口模塊來連接各機(jī)架。
用戶可以選用不同檔次的cpu模塊、品種繁多的i／o模塊和特殊功能模塊，對(duì)硬件配置的選擇余地較大，維修時(shí)更換模塊也很方便。
有的模塊式plc(如西門子的s7-300系列plc)沒有機(jī)架，各模塊安  裝在鋁質(zhì)導(dǎo)軌上，相鄰的模塊之間用模塊下面的u形總線連接器連接。

WESTINGHOUSE LA3600F  LA3600F
WESTINGHOUSE LA3600F CIRCUIT BREAKER **
WESTINGHOUSE LA3600F 600 VAC 600 Amp 3 Pole CIRCUIT BREAKER frame only
WESTINGHOUSE LA3600  LA3600
WESTINGHOUSE LA3600 MOLDED CASE BREAKER 600 AMP 600 VAC 3 POLE MODEL LA3600WK
WESTINGHOUSE LA3600 600A MAGNETIC TRIP UNIT STYLE 2603D47G32
WESTINGHOUSE LA3600 600 VAC 600 Amp 3 Pole CIRCUIT BREAKER
WESTINGHOUSE LA3500T  LA3500T
Westinghouse LA3500 Circuit Breaker - Reconditioned
WESTINGHOUSE LA3400WK 400A NON-AUTO STYLE 1375D46G02
WESTINGHOUSE LA3400WK * IN A BOX*
WESTINGHOUSE LA3400W 600 VAC 400 Amp 3 Pole CIRCUIT BREAKER
WESTINGHOUSE LA3400S 600 VAC 400 Amp 3 Pole CIRCUIT BREAKER
WESTINGHOUSE LA3400PTV Style # 5661027G32 Trip Unit for LA TRI PAC Breakers
WESTINGHOUSE LA3400PT  LA3400PT
WESTINGHOUSE LA3400PT  LA3400PT
Westinghouse LA3400PRF, 90 Amp, Calibrated, Tested.
Westinghouse LA3400PRF w/ 400A trip.  tested. Tri-Pac Circuit Breaker
WESTINGHOUSE LA3400PRF  LA3400PRF
WESTINGHOUSE LA3400PRF  LA3400PRF
Westinghouse LA3400PRF Circuit Breaker
WESTINGHOUSE LA3400PRF 600 VAC 400 Amp 3 Pole CIRCUIT BREAKER frame only
WESTINGHOUSE LA3400PRF 600 VAC 400 Amp 3 Pole CIRCUIT BREAKER
Westinghouse LA3400PRF 400A AB De-Ion Circuit Breaker w/ 200A Trip LA3400-PRF
Westinghouse LA3400PRF 400A AB De-Ion Breaker w/350A Trip LA3400-PRF 350 Amp
Westinghouse LA3400PRF 400 Amp AB De-Ion Circuit Breaker w/400A Trip LA3400-PRF
Westinghouse LA3400PRF 400 Amp AB De-Ion Circuit Breaker w/ 225A Trip 400A
WESTINGHOUSE LA3400PRF 3 Pole 400 Amp LA TRI PAC Breaker Frame
Westinghouse LA3400PR Circuit Breaker - Reconditioned
Westinghouse LA3400PF, 350A 22kAIC, Reconditioned
WESTINGHOUSE LA3400PF 600 VAC 400 Amp 3 Pole CIRCUIT BREAKER w/ Shunt trip
WESTINGHOUSE LA3400PF 600 VAC 400 Amp 3 Pole CIRCUIT BREAKER
Westinghouse LA3400P Circuit Breaker - Reconditioned
Westinghouse LA3400NWS 400 Amp 3 pole switch
WESTINGHOUSE LA3400NW AB DEION Cir Interrupter Type LA 400 AMP 600 VAC 3 Pole
WESTINGHOUSE LA3400NW 400A 600V LA TRI-PAC FRAME
WESTINGHOUSE LA3400FS  LA3400FS
WESTINGHOUSE LA3400FS  LA3400FS
WESTINGHOUSE LA3400FS 600 VAC 400 Amp 3 Pole CIRCUIT BREAKER frame only
Westinghouse LA3400F, 400 Amp, 600 VAC, 3 Pole, MC Breaker, w/Adj Magnetizer
WESTINGHOUSE LA3400F WITH 300 AMP TRIP
Westinghouse LA3400F circuit breaker 3p 350amp 600volt
Westinghouse LA3400F Circuit Breaker - Reconditioned
WESTINGHOUSE LA3400F 400A 600V STYLE 455D788G06
WESTINGHOUSE LA3400F 400A 600V STYLE 455D788G06
Westinghouse LA3400F 3 Pole 600 VAC Circuit Breaker
WESTINGHOUSE LA3400  LA3400
Westinghouse LA3400 Switch
Westinghouse LA3400 Circuit Breaker - Reconditioned
WESTINGHOUSE LA3400 600 VAC 400 Amp 3 Pole CIRCUIT BREAKER w/ Shunt trip
WESTINGHOUSE LA3400 600 VAC 400 Amp 3 Pole CIRCUIT BREAKER
WESTINGHOUSE LA3400 400 AMP 600 VOLT 3 POLE CIRCUIT BREAKER--SES
WESTINGHOUSE LA336261 600 VAC 261 Amp 3 Pole CIRCUIT BREAKER w/ Shunt trip, Bell
WESTINGHOUSE LA3350PT  LA3350PT
Westinghouse LA3350PR Circuit Breaker - Reconditioned
WESTINGHOUSE LA3350PF 600 VAC 350 Amp 3 Pole CIRCUIT BREAKER w/ Shunt trip
Westinghouse LA3350P Circuit Breaker - Reconditioned
WESTINGHOUSE LA3350 600 VAC 350 Amp 3 Pole CIRCUIT BREAKER
WESTINGHOUSE LA3300T  LA3300T
WESTINGHOUSE LA3300T **
WESTINGHOUSE LA3300PT  LA3300PT
Westinghouse LA3300PR Circuit Breaker - Reconditioned
Westinghouse LA3300PR Circuit Breaker -  Surplus
Westinghouse LA3300PF Circuit Breaker - Reconditioned
WESTINGHOUSE LA3300PF 600 VAC 300 Amp 3 Pole CIRCUIT BREAKER w/ Shunt trip
Westinghouse LA3300P Circuit Breaker - Reconditioned
WESTINGHOUSE LA3300 W/ 50 DEGREE TRIP **
WESTINGHOUSE LA3300  LA3300
Westinghouse LA3300 Circuit Breaker - Reconditioned
WESTINGHOUSE LA3300 600 VAC 300 Amp 3 Pole CIRCUIT BREAKER
WESTINGHOUSE LA3300 300 AMP 600 VOLT 3 POLE CIRCUIT BREAKER--SES
Westinghouse LA3275PR Circuit Breaker - Reconditioned
Westinghouse LA3275 Circuit Breaker - Reconditioned
Westinghouse LA3250P TRIPAC Breaker Calibrated, Tested
WESTINGHOUSE LA3250  LA3250
WESTINGHOUSE LA3250 **
WESTINGHOUSE LA3225PT  LA3225PT
WESTINGHOUSE LA3225PRF 600 VAC 225 Amp 3 Pole CIRCUIT BREAKER w/ Shunt trip
Westinghouse LA3225PR Circuit Breaker - Reconditioned
Westinghouse LA3225P Circuit Breaker - Reconditioned
WESTINGHOUSE LA3225F 600 VAC 224 Amp 3 Pole CIRCUIT BREAKER frame only
WESTINGHOUSE LA3225  LA3225
Westinghouse LA3225 Circuit Breaker - Reconditioned
WESTINGHOUSE LA3200PRF 600 VAC 200 Amp 3 Pole CIRCUIT BREAKER
Westinghouse LA3200PR Circuit Breaker - Reconditioned
Westinghouse LA3200PF Circuit Breaker - Reconditioned
Westinghouse LA3200P Circuit Breaker - Reconditioned
WESTINGHOUSE LA3200  LA3200
WESTINGHOUSE LA3175PRF 600 VAC 175 Amp 3 Pole CIRCUIT BREAKER w/ Shunt trip
WESTINGHOUSE LA3175PRF 600 VAC 175 Amp 3 Pole CIRCUIT BREAKER
Westinghouse LA3175PR Circuit Breaker - Reconditioned
Westinghouse LA3175 Circuit Breaker - Reconditioned
WESTINGHOUSE LA3150PT  LA3150PT
WESTINGHOUSE LA3150PR  LA3150PR
WESTINGHOUSE LA3150PR  LA3150PR
Westinghouse LA3150PR Circuit Breaker - Reconditioned
WESTINGHOUSE LA3150PF 600 VAC 150 Amp 3 Pole CIRCUIT BREAKER
Westinghouse LA3150P Circuit Breaker - Reconditioned
WESTINGHOUSE LA3150 600 VAC 150 Amp 3 Pole CIRCUIT BREAKER w/ Shunt trip
WESTINGHOUSE LA3125PRF 600 VAC 125 Amp 3 Pole CIRCUIT BREAKER w/ Shunt trip
WESTINGHOUSE LA3125PRF 600 VAC 125 Amp 3 Pole CIRCUIT BREAKER
WESTINGHOUSE LA3125PR TRI PAC Breaker 125A LA3400PRF w/ LA3125TP Trip Unit
Westinghouse LA3125PR Circuit Breaker - Reconditioned
WESTINGHOUSE LA3100PT NIB TRI PAC TRIP UNIT 100A SEALED 5661D26G23 #A80
WESTINGHOUSE LA3100PT 5661D26G23  IN BOX SEE PICS 100A TRIP U