Znyx ZX5000-X3
Znyx ZX5000-X3
Znyx ZX5000-X3
:祖巧麗
:
任何一種控制系統(tǒng)都是為了實(shí)現(xiàn)被控對(duì)象的工藝要求,以提高生產(chǎn)效率和產(chǎn)品質(zhì)量。因此,在設(shè)計(jì)PLC控制系統(tǒng)時(shí),應(yīng)遵循以下基本原則:
1. zui大限度地滿足被控對(duì)象的控制要求
充分發(fā)揮PLC的功能,zui大限度地滿足被控對(duì)象的控制要求,是設(shè)計(jì)PLC控制系統(tǒng)的首要前提,這也是設(shè)計(jì)中zui重要的一條原則。這就要求設(shè)計(jì)人員在設(shè)計(jì)前就要深入現(xiàn)場進(jìn)行調(diào)查研究,收集控制現(xiàn)場的資料,收集相關(guān)*的國內(nèi)、國外資料。同時(shí)要注意和現(xiàn)場的工程管理人員、工程技術(shù)人員、現(xiàn)場操作人員緊密配合,擬定控制方案,共同解決設(shè)計(jì)中的重點(diǎn)問題和疑難問題。
2. 保證PLC控制系統(tǒng)安全可靠
保證PLC控制系統(tǒng)能夠*安全、可靠、穩(wěn)定運(yùn)行,是設(shè)計(jì)控制系統(tǒng)的重要原則。這就要求設(shè)計(jì)者在系統(tǒng)設(shè)計(jì)、元器件選擇、軟件編程上要全面考慮,以確保控制系統(tǒng)安全可靠。例如:應(yīng)該保證PLC程序不僅在正常條件下運(yùn)行,而且在非正常情況下(如突然掉電再上電、按鈕按錯(cuò)等),也能正常工作。
3. 力求簡單、經(jīng)濟(jì)、使用及維修方便
一個(gè)新的控制工程固然能提高產(chǎn)品的質(zhì)量和數(shù)量,帶來巨大的經(jīng)濟(jì)效益和社會(huì)效益,但新工程的投入、技術(shù)的培訓(xùn)、設(shè)備的維護(hù)也將導(dǎo)致運(yùn)行資金的增加。因此,在滿足控制要求的前提下,一方面要注意不斷地?cái)U(kuò)大工程的效益,另一方面也要注意不斷地降低工程的成本。這就要求設(shè)計(jì)者不僅應(yīng)該使控制系統(tǒng)簡單、經(jīng)濟(jì),而且要使控制系統(tǒng)的使用和維護(hù)方便、成本低,不宜盲目追求自動(dòng)化和高指標(biāo)。
4. 適應(yīng)發(fā)展的需要
由于技術(shù)的不斷發(fā)展,控制系統(tǒng)的要求也將會(huì)不斷地提高,設(shè)計(jì)時(shí)要適當(dāng)考慮到今后控制系統(tǒng)發(fā)展和完善的需要。這就要求在選擇PLC、輸入/輸出模塊、I/O點(diǎn)數(shù)和內(nèi)存容量時(shí),要適當(dāng)留有裕量,以滿足今后生產(chǎn)的發(fā)展和工藝的改進(jìn)。
DEZURIK 136-LCV-264B SIZE 3 VALVE ACTUATOR 9222398
SS-65XTF12 Valve 1000 PSIG Flow CF3M
AUTOMATIC VALVE SOLENOID VALVE 407D67S39DS3-DB?7
CONTINENTAL HYDRAULICS 4600PSI DIRECTIONAL CONTROL VALVE VS50M-3L-G70C3-?10
NUMATICS ACTUATOR PNEUMATIC VALVE REPAIR KIT, N98-2181 *NEW SEALED*
VICKERS PRESSURE REDUCING VALVE DGMX1-3-PP-BK-B?-40
SMC 24VDC DIRECT OPERATED POPPET SOLENOID VALVE W/ (2) FITTINGS, VK332-5HS-M5-F
JAMESBURY 150PSI 6" VALVE ACTUATOR ST-600
AUTOMATIC VALVE 10BAR PNEUMATIC SOLENOID VALVE 407B67S3S3-DB0T?Y 01
SMC AR40K-N03-Z REGULATOR 125PSI NEW
JAMESBURY VALVE ACTUATOR VPVL300 SR4/5 103307
3" BUTTERFLY VALVE
HUMPHREY 24VDC 6.7W 125 PSI 1/2" ORIFICE AIR PILOT VALVE, 500AE1 3 10
REFRIGERATING SPECIALISTS 115V 37W SOLENOID COIL, 30-0030-01 *NEW*
REXROTH 110/115V 60VDC 5.9W COIL, 1824210237 *NEW*
MAXON 1" SHUT-OFF VALVE 760 2 104423
MILWAUKEE VALVE 1/2" 300WOG 150SWP GATE VALVE 590 NIB
NUMATICS 150PSIG 110/120V 50-60HZ 12A 153SS5315000030 SOLENOID VALVE NEW IN BAG
LADISH V218 1 1/2" CHECK VALVE V-5260 -0607-15A
TYLER PIPE 6" MECHANICAL JOINT ACCESSORY SET NIB
MAC 110/120V 24VDC 150 PSI 1/4" NPTF PNEUMATIC SOLENOID VALVE, 225B-110E
ASCO RED HAT SOLENOID VALVE 1-1/4 120/60 110/50 WP822129 NNB
SMC NVFS4500-3FZ VALVE 110VAC SEALED IN BAG
MAC 24V 5.4W DIRECTIONAL CONTROL VALVE MAC 92B-AAB-000-DM-?DDAP-1DN *NEW NO BOX*
PARKER SOLENOID VALVE 1/2" NPT 20-150PSI 120/60V 110/50HZ 7.2W SS20105001
DELTROL FLUID PRODUCTS F25B 3/8" NPT FLOW CONTROL VALVE
VICKERS DIRECTIONAL SOLENOID CONTROL VALVE DG4V-3-23A-M-P7?-H-7-52
XOMOX PLIAXSEAL 150PSI@400°F SHUT-OFF VALVE CF3M CKDN / 95C009L2
FESTO 105 PSI 1/8" NPT PNEUMATIC SOLENOID VALVE, MOCH-3-1/8, NNB SEALED
DAIKIN 24VDC 35 MPA HYDRAULIC SOLENOID CONTROL VALVE, KSO-G02-4CP-30-?EN *NEW*
FESTO CPV10-VI M402 CPV10-GE-ASI-8E?8A-Z-M8 MANIFOLD W/ (3) 161 414 M402 1 BROKEN
SPIRAX SARCO 2" FT 75 FLOAT TRAPS GENUINE RENEWAL PARTS VALVE MECH ASSY 4
NUMATICS 120V 50-60HZ 150PSI .15A SOLENOID VALVE 082SS432K *NEW*
SKINNER-SEAL 4-INCH STD STEEL PIPE CLAMP 105562
WATTS FLUIDAIR 300 PSI 3/4IN. NPT REGULATOR VALVE R119-06C
BROOKS INSTRUMENT DIV. FLOW METER 1110-10H3B1A
SMC VHS2500-01-X116 0.1-1.0 MPA VALVE NEW
NUMATICS 24VDC 4.0W SOLENOID VALVE COIL, 236-312B *NEW SEALED*
PBM SIHLE5X-K-02 1" 2-WAY BALL VALVE W/ HYTORK GENESIS GSI 34B CATS ACTUATOR
NIBCO * 1/2" TRU-BLOC BALL VALVE *