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ONEYWELL ISSC 621-4500 SOURCE INPUT 6214500 REPAIRED
NIB honeywell 621-9935 Serial I/O Module
HONEYWELL 621-9933 PROCESSOR RACK PWR SUPPLY 230 VAC
HONEYWELL ISSC 621-4500 INPUT MODULE 24VDC 6214500
HONEYWELL 621-3580 INPUT MODULE 24 VDC 32 POINT 6213580
Honeywell 621-3580 PLC 32 PT DC Input Card
HONEYWELL 621-6575 OUTPUT MODULE 24VDC 6216575
Honeywell PLC Input Module 621-1180RC
Honeywell I/O Rack Power Supply 621-9934
HONEYWELL 621-9934
HONEYWELL 621-3580
Honeywell Input Module Model: 621-1151
honeywell 621-0006 BCD Converter
HONEYWELL ISSC 621-4500 SOURCE INPUT MODULE 6214500 NIB
Honeywell 24vdc Output Module 621-6500
Honeywell 621-9933C Processor rank power supply
HONEYWELL 621-0010-A ANALOG OUTPUT MODULE 6210010A
HONEYWELL 621-2102R OUTPUT MODULE
NIB HONEYWELL 621-0307R
Honeywell I/O Rack Power Supply 621-9934 #11481
Honeywell 621-6575 6216575 Output Module
HONEYWELL 621-9940 SERIAL I/O MODULE 6219940
honeywell 621-9930 I/O Control module
HONEYWELL INPUT MODULE 621-1160R
HONEYWELL 621-9937
HONEYWELL 621-3560
HONEYWELL INPUT MODULE 621-3552RC
Honeywell 621-9900
HONEYWELL ISSC 621-2150 OUTPUT MODULE 6212150
Honeywell ISSC 621-3500 Sink Input Module PLC 6213500
Honeywell ISSC 621-9934 I/O Rack Power Supply 6219934
HONEYWELL 621-0010-ARC ANALOG OUTPUT MODULE 6210010ARC
HONEYWELL 621-1151 INPUT MODULE 6211151
HONEYWELL 621-6575RC OUTPUT MODULE
HONEYWELL 621-0020R UNIVERSAL ANALOG INPUT MODULE GOOD TAKEOUT
HONEYWELL ISSC 621-3500 DIGITAL INPUT MODULE 8 POINT
HONEYWELL 621-0010RC ANALOG OUTPUT MODULE
HONEYWELL 621-0021RC ENHANCED DIAGNOSTIC MODULE
NIB Honeywell Input Module 621-3552RC
honeywell module plc pcu card terminal block swing arm 22017 621-9950
621-9949 HONEYWELL I/O TERMINAL BLOCK 8PT
Honeywell 621-9949 Terminal Block/Wiring Arm 21965
HONEYWELL ISOLATED ANALOG INPUT 621-0022-V *NICE*
HONEYWELL IPC 621 I/O RACK 621-9990C
Honeywell 621-4500 6214500 Input Module
Honeywell ISSC PLC Card 621-1151
Honeywell ISSC PLC Card 621-1150
Honeywell ISSC PLC Card 621-2150
NIB HONEYWELL 621-9937 PARALLEL I/O MODULE 6219937
HONEYWELL 621-9934 8A I/O POWER SUPPLY 115/230VAC 6219934 NIB
NIB HONEYWELL 621-3580RC 24VDC INPUT MODULE 6213580RC
Honeywell 621-1100 6211100
Honeywell 621-9949 Terminal Block/Wiring Arm 21938
Honeywell 621-9950 Terminal Block/Wiring Arm 6219950
NIB Honeywell 621-1160R 6211160R Input Module
HONEYWELL POWER SUPPLY # 621-9931
Honeywell ISSC 621-0003 Analog Output Module 6210003
HONEYWELL 621-0010R ANALOG OUTPUT MODULE GOOD TAKEOUT
HONEYWELL 621-4550 SOURCE INPUT 6214550
HONEYWELL INPUT MODULE 621-3560R
Honeywell ISSC 621-2150 Output Module 115VAC 6212150
Honeywell 621-0007R 6210007R Reed Relay Module
HONEYWELL BCD MODULE 621-0006
Honeywell ISSC 621-1101 Isolated Input Module 6211101
Honeywell ISSC 621-2101 Output Module 6212101 115 VAC
HONEYWELL 621-9930 PARALLEL I/O MODULE 6219930
New Honeywell 621-1100 Input Module 6211100 ISSC NIB
HONEYWELL 621-6450 OUTPUT MODULE 12VDC
HONEYWELL BLANK I/O COVERPLATE 621-9900
HONEYWELL 621-3560R INPUT MODULE 6213560R NIB FS
1 NIB HONEYWELL 621-3550 6213550 24VDC SINK INPUT
Honeywell ISSC PLC Card 621-4350
NIB Honeywell Serial Link Module 621-9939
Honeywell Serial Link Module 621-9939
HONEYWELL 621-0000 ANALOG INPUT MODULE GOOD TAKEOUT
Honeywell ISSC PLC Card Rack 621-9996 7 slot
HONEYWELL 621-6350 OUTPUT MODULE 6216350 REPAIRED
HONEYWELL BCD 621-0006 PCA INPUT BCD BOARD PLC1225 CONVERTER MODULE 41035
HONEYWELL 621-1150 INPUT MODULE 115VAC 6211150
Honeywell PLC 24VDC Input Module 621-3500R
honeywell module plc pcu card terminal block swing arm 21965 621-9949 top
HONEYWELL ISSC 621-6500 OUTPUT MODULE 6216500
NEW Honeywell I/O Terminal Block 16PT 621-9950 6219950
Honeywell ISSC 621-9952 Terminal Block NEW
Honeywell Input Module Model: 621-3580R
Honeywell ISSC 621-9940 Serial I/O Module 6219940
Honeywell ISSC 621-6300 Source Output Module 6216300
Honeywell 621-9949 Terminal Block/Wiring Arm 6219949
HONEYWELL 621-9934 I/0 RACK POWER SUPPLY 6219934
Honeywell Simulator Input Module 621-0009
honeywell output module plc pcu card 621-6575r 6216575r 24 volt
Honeywell ISSC PLC Card 621-6500
honeywell output module plc pcu card 621-2150 6212150
HONEYWELL ISSC 621 6300 MODULE
Honeywell ISSC PLC Card 621-9930
Honeywell ISSC PLC Card 621-9934
Honeywell ISSC 621-2101R Isolated Output Module 6212101
HONEYWELL 621-1160 16 POINT INPUT MODULE 6211160 NIB
Honeywell ISSC 621-0000 Analog Input Module PLC 6210000
Honeywell ISSC 621-3300 Input Module 5VDC PLC 6213300
HONEYWELL 621-6550 OUTPUT MODULE GOOD TAKEOUT
HONEYWELL 621-0007 OUTPUT MODULE GOOD TAKEOUT
Honeywell 621-3580 6213580 Input Module
Honeywell Input Module Model# 621-1160R!
Honeywell ISSC 621-9931 I/O Power Supply PLC 6219931
HONEYWELL 621-9930 PARALLEL I/O MODULE 6219930 NIB
HONEYWELL 621-4500R
HONEYWELL 621-1180R INPUT MODULE **XLNT**
HONEYWELL 621-3560 24VDC INPUT BOARD 6213560
Honeywell ISSC 621-1100 115VAC Input Module PLC 6211100
HONEYWELL 621-1160R INPUT MODULE
HONEYWELL PARALLEL I/O MODULE 621-9937C
HONEYWELL 621-0010 ANALOG OUTPUT MODULE 6210010 REPAIRED
HONEYWELL 621-1160R 16 POINT INPUT MODULE 6211160R NIB
HONEYWELL 621-3300 INPUT MODULE 5VDC 6213300
Honeywell ISSC 621-9930 Parallel I/O Module 6219930
Honeywell 621-4550 PLC 16 PT DC Input Card
HONEYWELL 621-4350 INPUT MODULE 16 POINT 5V TTL
Honeywell Input Module NEW IN BOX 621-1500 #11429
honeywell module plc pcu card pnhc030046012 621-9900 issc-uspp blank cover
Honeywell Input Module 621-0006, #13844
HONEYWELL 621-0007R REED RELAY MODULE GOOD TAKEOUT
HONEYWELL 621-3560 24VDC 16PT INPUT MODULE ***XLNT***
HONEYWELL SDM MODULE # 621-0004
Honeywell Issc Ssec 621-9949 6219949 (312b-ck USED
Honeywell 621-6551 USED
HONEYWELL OUTPUT MODULE 621-2150 115 VAC 6212150
honeywell output module plc pcu card 621-2150 6212150 missing wire holders
HONEYWELL 621-0007 OUTPUT MODULE .5 AMP 250 VAC
HONEYWELL 621-9940 SERIAL I/O MODULE 6219940
HONEYWELL 621-3560 INPUT MODULE 24 VDC 6213650
Honeywell PLC Module 621-6500 24 VDC Output
3pc Honeywell ISSC AC Output PLC Modules 621-2100
honeywell output module plc pcu card 621-2150r missing bottom wire holder
HONEYWELL 621-9940C SERIAL I/O MODULE 6219940C
HONEYWELL 621-1101RC INPUT MODULE 6211101RC NIB
Honeywell 621-9950 6219950 I/O Terminal Swing Arms NEW
HONEYWELL SERIAL LINK MODULE 621-9939 6219939
honeywell output module plc pcu 621-2150rc 6212150rc 115 volts
Honeywell 621-9949 6219949 I/O Terminal Swing Arms NEW
NEW Honeywell ISSC 621-0000 Analog Input Module
honeywell output module plc pcu card 621-2150 6212150 missing top wire holder
Honeywell Input Module 621-4500 #11507
honeywell output module plc pcu card 621-6550
NEW Honeywell IPC 621-3550 I/O Module 16 Point
HONEYWELL IPC 621 OPERATOR PANEL SYSTEM 621 0989 REV A
Lot of 2 Honeywell I/O Input Modules Model# 621-0007R
Honeywell I/O Module Power Supply Model#621-9934?!
Honeywell Output Module 621-0007, #11484
Honeywell 621-1151 Input Module (UGC)
HONEYWELL PARALLEL I/O MODULE BOARD 621-9930
honeywell output module plc pcu card 621-6550r 6216550r source 24 volts
HONEYWELL 621-1101 R 621-1101R ISOLATED INPUT MODULE
HONEYWELL 621-0010-A ANALOG OUTPUT MODULE 6210010A
HONEYWELL 621-2150 6212150 OUTPUT MODULE #51
HONEYWELL 621-2175 OUTPUT MODULE ***XLNT***
Honeywell 621-1180 PLC 16 PT AC Input card
HONEYWELL 621-3552RC *NEW*
Honeywell Control Module 621-1500 #11499
Honeywell Output Module 621-6500, #13833
Honeywell Terminal Block Set 621-9949 #11518
Honeywell 51107403-100 LCN I/O Board 621-9938R Serial I/O Industrial Cont
HONEYWELL 621-1151 6211151 INPUT MODULE #50
Honeywell Parallel I/O Module 621-9930 #11497
HONEYWELL I/O 15 AMP POWER SUPPLY 621-9933C 115/230V
HONEYWELL 621-2150 6212150 115VAC OUTPUT MODULE
Honeywell PLC 5VDC Output Module 621-6300 NEW IN BOX
honeywell input module plc pcu card 6213560r 621-3560r 24 volts
Honeywell Output Module 621-6550 #11500
HONEYWELL 621-0022-ARC ISOLATED ANALOG INPUT MODULE
HONEYWELL 621-6550RC OUTPUT MODULE/ REFURBISHED
Honeywell 621-2150 Point Input Module
Honeywell ISSC 621-1160 Input Module 115 VAC 6211160
Honeywell 621-9934 6219934 115/230 VAC Power Supply
NIB HONEYWELL 621-1180RC INPUT MODULE 115VAC 32POINT
Honeywell / IPC PLC Module 621-6300 5 vdc Output NEW
HONEYWELL 621-0007R REED RELAY/OUTPUT MODULE ***NNB***
honeywell input module plc pcu card 621-1151 missing top and bottom wire holder
honeywell module plc pcu card input output power supply 621-9934 6219934
Honeywell Bland I/O Covers 621-9900 #11468
HONEYWELL SERIAL I/O MODULE 621-9940
HONEYWELL 621-0010R ANALOG OUTPUT MODULE 6210010R
Honeywell Output Card / Module Model# 621-2150
HONEYWELL SERIAL LINK MODULE BOARD 621-9939
Honeywell ISSC 621-2100 115VAC Output Module 6212100
Honeywell I/O Reed Relay Module Model# 621-0007R!
Honeywell I/O Rack 621-9990 NEW IN BOX #11541
Honeywell ISSC 621-9939 Serial Link Module 6219939
HONEYWELL 621-9934 I/O RACK POWER SUPPLY IPC 621 I/O SYSTEM 115/230 VAC 47-63
Honeywell ISSC 621-9990 IPC I/O Rack/Chassis
Moeller / Honeywell 621-6500RC DC Output Module NEW
HONEYWELL 621-6350R OUTPUT MODULE 6216350R NIB FS
Honeywell Issc Ssec Input Module 621-1160 62111160 USED
HONEYWELL DIGITAL INPUT MODULE 621-4550 24VDC 16 POINT
HONEYWELL 621-1150 INPUT MODULE GOOD TAKEOUT
honeywell linput module plc pcu card 621-1151 6211151
New Honeywell 8 PT I/O Terminal Block 621-9949 Pair
Honeywell 621-2150 USED
HONEYWELL PARALLEL I/O MODULE BOARD 621-9937
HONEYWELL 621-3560R INPUT MODULE 621-3560-R
1 NIB HONEYWELL 621-9990 6219990 I/O EXPANSION RACK
HONEYWELL 621-0022-AR ISOLATED ANALOG INPUT MODULE 6210022AR
Honeywell Terminal Block Set 621-9949 #11520
HONEYWELL 621-9934 I/O POWER SUPPLY MODULE 8A 115/230V
HONEYWELL ASC11 COMMUNICATION MODULE 621-0012R BOARD
HONEYWELL 621-0010R ANALOG OUTPUT MODULE 6210010R NEW
HONEYWELL 621-6550 OUTPUT MODULE 6216550 REPAIRED
HONEYWELL 621-6550 DIGITAL OUTPUT MODULE 24VDC 16 POINT
HONEYWELL 621-4350 5VTTL INPUT 16 POINT 6214350
Honeywell 621-1160 Point Input Module
HONEYWELL 621-6550RC SOURCE OUTPUT MODULE 24 VDC
HONEYWELL 621-0010R ANALOG OUTPUT MODULE 6210010R
honeywell input module plc pcu card 621-3560r missing bottom wire holder
HONEYWELL 621-3560R INPUT MODULE 6213560R NEW
HONEYWELL INPUT MODULE 5VTTL 621-4350R 6214350R
Honeywell analog output module 621-0010R
HONEYWELL 621-1160R INPUT MODULE 6211160R
HONEYWELL 621-0007R REED RELAY MODULE 250 VAC
HONEYWELL 621-0006 BCD CONVERTER MODULE
HONEYWELL 621-6550 OUTPUT MODULE ***XLNT***
HONEYWELL 621-0306 HIGH SPEED COUNTER ASSEMBLY
HONEYWELL 621-4550 SOURCE INPUT 6214550 NIB
Honeywell Terminal Block Set 621-9950 #11519
HONEYWELL 621-0022 ISOLATED ANALOG INPUT (PLC1232)
HONEYWELL 621-1160R INPUT MODULE 6211160R NIB FS
HONEYWELL INPUT MODULE 621-3560R SEALED 6213560R
Honeywell IPC 621 I/O Rack #11478
HONEYWELL ABSOLUTE ENCODER MODULE 621-0018R *NEW*
Honeywell Serial Link Module 621-9936, #13817
HONEYWELL 621-2150 MODULE 6212150
HONEYWELL 621-0004 SDM MODULE 6210004 REPAIRED AND TESTED
Honeywell ISSC Power Supply Model 621-9931
Honeywell Input Module 621-3550, #13835
Honeywell 621-9937 6219937 I/O Module Parallel USED
HONEYWELL 621-1160R INPUT MODULE 621-1160-R 6211160R
Honeywell 621-0007
HONEYWELL 621-1160 MODULE 6211160
HONEYWELL 621-6300 MODULE 6216300
HONEYWELL 621-9934 6219934 I 0 RACK 5V POWER SUPPLY
HONEYWELL 621-0009 SIMULATOR INPUT MODULE ***XLNT***
HONEYWELL 621-2100 OUTPUT MODULE 6212100
HONEYWELL 621-2100 MODULE 6212100
HONEYWELL 621-7021 MEMORY MODULE 6217021
Honeywell 621-0018 PLC Absolute Encoder card
HONEYWELL 621-9934C I/O POWER SUPPLY MODULE 8A 115/230V
HONEYWELL 621-6500 OUTPUT MODULE 6216500
HONEYWELL 621-0010 6210010 Analog Output Module
HONEYWELL 621-0006 BCD MODULE (PLC1225)
NIB HONEYWELL 621-1100 INPUT MODULE 6211100
Honeywell Parallel I/O Module 621-9937, #13841
Honeywell Analog Input Module 621-0015
Honeywell Controller Access Module CAM 621-0016
HONEYWELL IPC 621-9991 I O PLC RACK 6219996
NEW Honeywell Output Module 621-6550RC #13815
Honeywell Output Module 621-6500R, #13834
Honeywell Output Module 621-6350R, #13836
HONEYWELL 621-9930 PARALLEL I/O MODULE 6219930
NEW HONEYWELL 621-1100R INPUT MODULE 115V
Honeywell PLC 621-1101 isolated input 6 points 6211101
HONEYWELL 621-9937 PARALLEL I/O MODULE (PLC1229)
Honeywell 5VTTL Input 16 Point 621-4350R 6214350R NEW
Honeywell PLC Output Module 621-2175RC
Honeywell Output Module 621-6350 #11506
621-2101RC 115VAC ISOLATED INPUT, 6 POINT, SERIES 9000
HONEYWELL ISSC IPC 621-1100 115V AC/DC INPUT MODULE
HONEYWELL 621-3500 8 PT. INPUT CARD (PLC1204)
Honeywell Input Module 24VDC 621-3580R Free Ship
Honeywell input module 24VDC 621-3580RC
HONEYWELL 621-9940 SERIAL I/O MODULE (PLC1233)
HONEYWELL 621-1151 MODULE 6211151
HONEYWELL 621-9930 PARALLEL I/O MODULE (PLC1228)
HONEYWELL 621-2100 8 PT. OUTPUT CARD (PLC1205)
2 HONEYWELL 621-1100 INPUT MODULE 621-1100
621-2150R. 115 VAC OUTPUT, 16 POINT FOR HW SERIES 9000
Honeywell I/O Rack 621-9990 IPC 621 PLC CLASSIC
HONEYWELL 621-6550 MODULE 6216550
HONEYWELL 621-0006 MODULE 6210006
HONEYWELL 621-1101R USPP 6211101R
NIB HONEYWELL 621-0012RC COMMUNICATION MODULE
HONEYWELL 621-2150R 6212150R 115VAC OUTPUT MODULE
NIB HONEYWELL 621-9933 15A I/O PWR SUPPLY 6219933
Honeywell 621-9938 Serial I/O Mod Y803016500011 (UVG)
NEW HONEYWELL 621-0021C ENHANCED DIAGNOSTICS MODULE
HONEYWELL 621-2150R 6212150R 115VAC OUTPUT MODULE
621-0007RC REED RELAY OUTPUT, 6 POINT, HW SERIES 9000
HONEYWELL ISOLATED ANALOG INPUT MODULE 621-0022-AR VR
HONEYWELL 621-1180RC INPUT MODULE
HONEYWELL 621-6500 OUTPUT MODULE (PLC1223)
NEW HONEYWELL OUTPUT MODULE 115V 621-2100R
HONEYWELL 621-6550RC 24VDC SOURCE OUTPUT MODULE
HONEYWELL 621-9934 I/0 RACK POWER SUPPLY 6219934
Honeywell 621-1160R 115VAC Input Module
HONEYWELL 621-3550 MODULE 6213550
HONEYWELL 621-6300 OUTPUT MODULE 5V TTL 6216300
HONEYWELL ISOLATED ANALOG INPUT MODULE 621-0022-AR 621-0022-VR
HONEYWELL 621-1100 MODULE 6211100
Honeywell 621-9950 Terminal Block/Wiring Arm 22016 - LOT OF 7
Honeywell 621-9950 Terminal Block/Wiring Arm 22017 - LOT OF 7
HONEYWELL PLC 621-9937 6219937 PARALLEL I O MODULE BOARD
Honeywell 621-655ORC Output Module
HONEYWELL PARALLEL I/O MODULE 621-9937 MANUFACTURE REFUBISHED
HONEYWELL 621-3560 MODULE 6213560
HONEYWELL ISSC 621-0022-A INPUT MODULE ANALOG 8POINT 4-20 MA 6210022A
HONEYWELL 621-0024R INPUT MODULE PULSE 6210024R
Honeywell 621 Processor System 621-9933 With 9 Module
Honeywell 621 Processor System 620-0041
Processor 9010-015
HONEYWELL 621-1180 INPUT MODULE 115VAC 6211180
HONEYWELL 621-3500 MODULE
HONEYWELL 621-1180 MODULE 6211180
HONEYWELL 621-0009 MODULE 6210009
HONEYWELL 621-2100R MODULE 6212100R
HONEYWELL 621-0020R MODULE 6210020R
*HONEYWELL 621-1160R
HONEYWELL 621-0006 INPUT BCD MODULE 6210006
Honeywell 621-9962 Extender Rack Test Calibration Board
HONEYWELL 621-0000 INPUT MODULE (PLC1220)
HONEYWELL 621-0306 HIGH SPEED COUNTER 6210306
HONEYWELL 621-0306 ASC ASSEMBLY (PLC1215)
HONEYWELL 621-3502 NPUT MODULE 12-24VDC 6213502
HONEYWELL 621-9937 MODULE 6219937
HONEYWELL 621-0010 OUTPUT MODULE 6210010
HONEYWELL 621-9990 I/O RACK (PLC1238)
HONEYWELL 621-0006 INPUT MODULE BCD CONVERTER 6210006
HONEYWELL 621-3500 MODULE 6213500
HONEYWELL 621-9939C SERIAL LINK MODULE Free Ship
HONEYWELL 621-3580-R INPUT MODULE 621-3580R 6213580R
HONEYWELL 621-0016 CAM MODULE (PLC1235)
HONEYWELL 621-2150R MODULE 6212150R
HONEYWELL 621-0012R MODULE 6210012R
HONEYWELL 621-0010R MODULE 6210010R
HONEYWELL 621-1100R MODULE
HONEYWELL 621-1180R INPUT MODULE 6211180R
HONEYWELL ISSC INPUT MODULE 16POINT 621-4350
HONEYWELL 621-4300 MODULE 6214300
HONEYWELL 621-0019 MODULE 6210019
HONEYWELL 621-2150R OUTPUT MODULE 16POINT 6212150R
HONEYWELL 621-9931 I/O RACK POWER SUPPLY (PLC1216)
HONEYWELL 621-0010 MODULE 6210010
HONEYWELL 621-6551R MODULE
HONEYWELL 621-0004 MODULE 6210004
HONEYWELL 621-3502 MODULE 6213502
HONEYWELL 621-9000 MODULE 6219000
HONEYWELL 621-3560R INPUT MODULE 621-3560-R 6213560R
HONEYWELL 621-3560R
ISSC HONEYWELL 621-9931
NEW HONEYWELL 621-6350R
HONEYWELL IPC-621-2150
Honeywell 621-3580
HONEYWELL 621-0004 SDM MODULE 6210004
Honeywell 621-9995
HONEYWELL 621-9937,PARAL?LEL I/O BRD, 6219937
HONEYWELL 621-6350R MODULE 6216350R
NEW HONEYWELL 621-1180R MODULE 6211180R
HONEYWELL 621-2100 MODULE
HONEYWELL 621-6550R OUTPUT MODULE 621-6550-R 6216550R
HONEYWELL 621-0012RC MODULE 6210012RC
HONEYWELL 621-0022 MODULE 6210022
Honeywell 621-9937
HONEYWELL 621-1160R MODULE 6211160R
HONEYWELL 621-3580R MODULE 6213580R
HONEYWELL 621-0012RC MODULE 6210012RC
HONEYWELL 621-0019R MODULE 6210019R
HONEYWELL 621-0009R MODULE 6210009R
HONEYWELL 621-6575R MODULE 6216575R
Honeywell IPC 621 I/O System (power supply, serial, input/output modules, rack)
HoneyWell 621-6350 TTL Digital Output Module, 16pt
大型PLC的I/O点数大于2048，具有多CPU及16位或32位处理器，用户存储器容量为8~16KB。
世界上，PLC产品可按地域分成三大流派，一个流派是美国产品，一个流派是欧洲产品，一个流派是日本产品。美国和欧洲的PLC技术是在相互隔离情况下独立研究开发的，因此美国和欧洲的PLC产品有明显的差异性。而日本的PLC技术是由美国引进的，对美国的PLC产品有一定的继承性，但日本的主推产品定位在小型PLC上。美国和欧洲以大中型PLC而闻名，而日本则以小型PLC著称。。
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