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任何一种控制系统都是为了实现被控对象的工艺要求,以提高生产效率和产品质量。因此,在设计PLC控制系统时,应遵循以下基本原则:
1. 大限度地满足被控对象的控制要求
充分发挥PLC的功能,大限度地满足被控对象的控制要求,是设计PLC控制系统的前提,这也是设计中重要的一条原则。这就要求设计人员在设计前就要深入现场进行调查研究,收集控制现场的资料,收集相关先进的国内、国外资料。同时要注意和现场的工程管理人员、工程技术人员、现场操作人员紧密配合,拟定控制方案,共同解决设计中的重点问题和疑难问题。
2. 保证PLC控制系统可靠
保证PLC控制系统能够长期、可靠、稳定运行,是设计控制系统的重要原则。这就要求设计者在系统设计、元器件选择、软件编程上要考虑,以确保控制系统可靠。例如:应该保证PLC程序不仅在正常条件下运行,而且在非正常情况下(如突然掉电再上电、按钮按错等),也能正常工作。
MILLIPORE WAFERGARD II INLINE GAS FILTER WG2F01HC1
SMC NARB110-00-1, NARB110001, Spacer Regulator, Ship Same Day 1651B3
Murata Trimmer Resistors 20kohm PV36W203C01B00, 490-2881-ND
Panduit LCA35038, LCA350-38, Lot Of 3, .375 Dia Hole Shipsameday, BOX 1 1603A5
INA Bearing NKI 30/20B, Shipsameday W/2-3 Days Shipping 1638ZB
Rexroth P-029905-00005, P02990500005, ShipSameDay W/2-3 DaysShipping1173F
Spears Cross 3/4, 820-007, Lot-2 PVC, Sxs, 820007, Shipsameday 114V
Gardner Spring MW2645-028 - 2.057X2.645X0.028
SMC SY34205M0ZEM5, SY3420-5M0ZE-M5, Shipsameday 1177R
Pilz PNOZX2, PN0ZX2, 774303, 152991, ShipSameDay W/2-3 DaysShip1173A6
Koganei Air Cylinder JIG JDAS25X10, Shipsameday ZB51
Koganei CJL8x1, CJL-8x1, Shipsameday ZB48
Coast Pneumatice HKSHA6x8D, HKSHA6x8-D, BK11186, Shipsameday ZB49
Coast Pneumatic HKSHA6x5C-D, HKSHA6x5CD, BK19424, Shipsameday ZB50
IFM OG5050, 0GTFPKGUS, 0GT-FPKG/US, Shipsameday1547A31
WHITEY RISING PLUG VALVE 1/4 FNPT, SS-4PDF4, SS4PDF4, Shipsameday126G2
Kitz 600 WOG Ball Valve 1/2 & 3/4, Shipsameday ZS12
Telemecanique LB1-LC03M08, LB1LC03M08, ShipSameDay W/2-3DaysShipping1175T
Sensor Circuit Breaker MDC Cutler Hammer 10250TC2N
PANASONIC ERJ8ENF56R2V
AVX TAJA106K010RNJ
HONEYWELL AEROSPACE UNION, AN815-16K, ATC-STD-4940
Omron C200H-0D225, C200H-OD225, SHIPSAMEDAY W/2-3days Shipping1630A3
BALLUFF EN 50 262, BNS 819-X512-100-E-13-S4, EN50262 Shipsameday 108Z
SWAGELOK Bonnet Needle Valve 1/4, SS-1VS4, SS1VS4, SHIPSAMEDAYF26
DK-LOK GAAMF-8N-10K-S, 1/2x1/2, Ref SS-8-A, Shipsameday ZB13
Schmersal 1145379, ShipSameDay W/2-3days SHIPPING1608A26
Murr 4000-68000-1160000, 4000680001160000, ShipSameDay W/2-3 DAYS SHIP1608A52
Swagelok Poppet Check Valve 1/4 Comp, 1PSIG, SS-4C-1, Ss4C1, Shipsameday1327C7
Swagelok Diaphragm Valve 1/4 FVCR, 6LV-DAFR4-P-C, Shipsameday C14
ALCO SWITCH 2M25DS, MODULE INTERFACE D-SUB 25PIN/CONNECTOR
Wiha-SoftFinish, 6,5x150, 4,5x125, 3,5x100, SHIPSAMEDAY1537X
Idec RH2B-U & RH2B-UD & Omron LY2N-D2, W/Base SH2B-05B & 1755YT 120Z11
Omron Solid State Relay G3NA-205B, 240V, 2535EH, Shipsameday 120Z12
NUMATICS MALE ELBOW SWIVEL 1/4 NPT X 3/8 TUBE, 308-021, 308021 136P
Cutler Hammer Photoeye Proximity E65-SMPPS9196 , SHIPSAMEDAY169P1
Omron TLXD2, TL-XD2, 8-40 Vdc, ShipSameDay W/2-3 DAYS SHIPPING 1609A19
Numatics Regulator Coil 152RS400J016W, SHIPSAMEDAY 1540N
ABB Contactor 24V Coil, KC40E, Shipsameday W/2-3dayshipping 137H26
Conxall / Switchcraft 5182-3PG-3XX, 1230K
Idec BN150WP, BN150WPN05, ShipSameDay W/2-3DaysShipping1176G
Amphenol 10-825923-163, 97-67-16-8, ShipSameDay, 1559K
RMS TECHNOLOGIES R208 DRIVER, Shipsameday 125A1
BUSS Bussman R25030-2PR, R250302PR, 250V 30A, LOT OF 4, SHIPSAMEDAY1543A16
SMC SOLENOID VALVE, VQZ232R-5G1-C6-F, Shipsameday1534B8
Allen Bradley 193-EB1CB SHIPSAMEDAY1628A36
HYSTER HY1314387: SENSOR (HY 1314387) 1314387, Shipsameday 118H