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一般小型（低档）PLC具有逻辑运算、定时、计数等功能，对于只需要开关量控制的设备都可满足。对于以开关量控制为主，带少量模拟量控制的系统，可选用能带A／D和D／A单元。具有加减算术运算。数据传送功能的增强型低档PLC。
对于控制较复杂，要求实现PID运算、闭环控制、通信联网等功能，可视控制规模大小及复杂程度，选用中档或高档PLC。但是中、高档PLC价格较贵，一般大型机主要用于大规模过程控制和集散控制系统等场合。
4．响应速度的要求
PLC的扫描工作方式引起的延迟可达2－3个扫描周期。对于大多数应用场合来说，PLC的响应速度都可以满足要求，不是主要问题。然而对于某些个别场合，则要求考虑PLC的响应速度。为了减少PLC的I／O响应的延迟时间，可以选用扫描速度高的PLC，或选用具有高速I／O处理功能指令的PLC，或选用具有快速响应模块和中断输入模块的PLC等。
5．系统可靠性的要求
对于一般系统PLC的可靠性均能满足。对可靠性要求很高的系统，应考虑是否采用冗余控制系统或热备用系统。
Continental Specialities Proto-Board No. 203A
GE Fanuc 44B398625-001, 44A398714-G01, 44B398808-002/8?
FANUC MATSUURA 0047A05 BOARD 0047A 05
TSUDAKOMA SBS 627327BY
WATLOW 40EJBEA024A Thermocouple G645154
Phoenix Contact UK 2, 5 N / 30-03-34-7
Stocker Yale Lasiris Laser Light - Wavelength: 400 to 700
Omron XW2Z-500T 04Z6 PLC to PT Connector Cable XWZ0035A, 20F003
BALLUFF BGL 30A-007-S49 FORK SENSOR 10...30VDC
TURCK BKWM 14-836-10 Versa Fast Cable U0969-31
Turck BiM-IKT-AP6X-H1?141 W/LKI-3
Allen-Bradley 889M-F12X9AE-10
Rittal SZ 2368.010
Leuze Electronic prk 25/66.2 Leuze Electronic 50104202 0511A462713
Leuze Electronic Sensors ILSER 3/4 S810001 / LSSR 3.8 P809006
Omega Engineering iDRX-ST Signal Conditioner w/ Half-Duplex RS485
Bank of 2 Burkert 312-C-02, 0-B-MS 24V Solenoid Valves FLNSCH-F-000 0415210 MPU
SPC Technology PVI-S15-1100-BL?K PVC-105
MISUMI HGCNS12-W30-H30
ABB TMAX T1N 100 CIRCUIT BREAKER W/ ROTARY ON OFF RESET TEST SACE SWITCH
Finder Type 40.52 24V Relays w/ Finder Type 95.05 base & 99.02.0.024.98
Beckhoff IL2301 B900-0000 Ethernet TCP/IP Field Bus Module 10/100base-TX 24V M8
TURCK BIC-84-E424
ALLEN BRADLEY 440K-E33031
Black Box CBCC275830
Oriental Motor CC030VAF-M
Easton Acopian B24G110
SIMCO RAMIC CORP SRC PCB ASSY FBSU Video Memory VGA 94-155204 -001 REV A
REGAL BELOIT ECM5257 M3325 21/00K Chart Drive Motor 115/230 Volt 150 RPM
Parker 3-Way Solenoid 7D100C2 Valve 3/4 24VDC 10W
Phoenix Contact VIP-2/SC/FLK50/?PLC Terminal Block Interface Module 2315227
Banner Engineering QS18VP6LDQ5
Ashcroft 4-1/2" Retard Duragauge Pressure Gauge, 45-1279-AS-02L-?30IMV&150
Allen Bradley 800T-QAH24G
Woodhead BradConnectivit?y 1300180125
Porta Systems SYOSSET, Model 575-3, 575-32-3993-3
SMC AF20-N02-CZ (GQ) & AFM20-N02-CZ (IT)
BradConnectivit?y Woodhead 1300100803
American Dynamics AD2091
Allen Bradley 872-DH3NP12-D4 10-30 VDC
Premium Coil EAD-25 Timed Electric Auto-Drain JCM 115V AC 50/60Hz 13W IP00/65
Rotomation 837100133-S 24VDC
VAT 26424-KA11-0002?/7496
Bimba MRS-.027-BQCX
Bimba MRS-.027-BQCX
Omega MICROMEGA CN77544-A2 PID
Foxboro N0148PH
Allen Bradley 872C-K4N12-R3C
Allen Bradley 872C-D3CP12-D4
Baumer IFRM 08P17A4/S35L
Bimba HCQCX Quick Connect Sensor Cable
Turck RYM RKM 511-6M/S1587 Mini-Fast Straight Connector U-59420
Turck RSM RKM 40-5M/S101 Flex Life Connector Cable U0981-56
Allen Bradley 872C-K4N12-R3
750 Ft, 6 Inch Wide, 4 Mil Yellow
Allen Bradley 855E-B24SA3
Epson SKP329-2 I/O Board, Melec SP1520-1, SRC-320 ABS
BECKHOFF EP2338-0001 8 Channel Ether-Cat Box
Hoffman F88L06 Straight Section, 6", Electrical Wireway, NIB
Sandvine 11-00016C-B01 11-0 07101 133098-01 94V-0,
SMC MXH16-30
Phoenix Contact STOV2-120AC/60D?C/1
Pilz PNOZ X10 Safety Relay 24VDC 6 n/o 4 n/c 3LED 774709
Automation Direct GS1-21P0 AC Micro Drive 230VAC 1HP 200-240V 50/60Hz 1PH/3PH
MTS PWB D4630-42-01 A
Optrex DMC40457 Display Board NY-LYB 9494R1 w/ Connector
Balluff BNI007R/H02_S14 IO
SMC AVL2000-N02-5DZ?M
Phoenix Contact 2726272 189, Inline Terminal Digital Output IB IL 24 DO 16
Hoffman F44LJ
Siemens 52PT6GNA Class 52 Push to Test Illuminated Push Button SFIS-5202A-0108
Kenwood KNB-57L
SMC SY5420-5W0Z-01T?-F2
Omron G6B-4BND Contact with G6BG6B-1114P-FD?-US-P6B
Wiremold ALA4815 PW39
Lumberg Automation 0931 DNC 301
DINnectors DN-3J6 Jumper Bar connector, QTY 300 Screws, DN-T6
SMC IRV10-N07BG
Allen Bradley 800TC-PH16W
Eaton HT8GDAAF7 Illum Amber BP w/ Guard, 120V, Push Button Light, T0716, A1
Molex BradConnectivit?y 1300190018 Orange Safety Plug, 43301
Precision Instruments Transducer Model TT2F150H
WESTINGHOUSE Bank Overlap Decoder, PC BOARD, PN: 3359C71G01, NEW, C0425-009 / G
Allen-Bradley 440N-G02096 Ferrogard FRS9 Safety Switch 4-Pin 24VDC 1A 0430247909
SMC ISE80-N02-T Digital Pressure Switch Assembly, NISE8A01
Turck Ni2-Q6.5-AP6-0.?1-FS4.4X3/S304, 1650048
SMC SMC8508T-NP EZ Switch 10/100/1000
Microscan MS-820 / FIS-0820-0101G
