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如果必須要在上面的環(huán)境使用，則要為PLC制作合適的控制箱，采用規(guī)范和必要的防護(hù)措施。如果需要在野外極低溫度下使用，可以使用有加熱功能的控制箱。如何做這些防護(hù)箱或控制箱，各制造商和和資格的系統(tǒng)集成商將會(huì)為客戶提供相應(yīng)的供應(yīng)和設(shè)計(jì)。

         在使用控制箱時(shí)，在控制箱內(nèi)OpenPLC安裝的位置要注意如下事項(xiàng)：控制箱內(nèi)空氣流通是否順暢（各裝置間須保持適當(dāng)?shù)木嚯x），變壓器、馬達(dá)控制器、變頻器等是否與PLC保持適當(dāng)距離，動(dòng)力線與信號(hào)控制線是否分離配置，組件裝設(shè)之位置是否利于日后之檢修，是否需預(yù)留空間，供日后系統(tǒng)擴(kuò)充使用。

         除了上述注意事項(xiàng)之外，還有其它注意事項(xiàng)要留意。

          首先比較重要的是靜電的隔離。靜電是無形的殺手，但可能因?yàn)椴粫?huì)對(duì)人造成生命危險(xiǎn)，所以許多人常常忽視它。在中國的北方、干燥的場(chǎng)所，人體身上的靜電都是造成靜電損壞電子組件的因素。雖然你被靜電打到的話，只不過是輕微的酥麻，但這對(duì)PLC和其它任何電子器件就足以致命了。

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鄭娟萍

廈門仲鑫航自動(dòng)化設(shè)備有限公司  

     要避免靜電的沖擊有下列三種方式：在進(jìn)行維修或更換組件時(shí)，請(qǐng)先碰觸接地的金屬，以去除身上的靜電；不要碰觸電路板上的接頭或是IC接腳；電子組件不使用時(shí)，請(qǐng)用有隔離靜電的包裝物，將組件放置在里面。想象PLC里的元器件是一個(gè)嬌嫩的嬰兒，而那些靜電會(huì)導(dǎo)致這個(gè)嬰兒死亡，你就會(huì)更容易以正確的態(tài)度對(duì)待這個(gè)問題了。

         基座安裝（RACK）時(shí)，在決定控制箱內(nèi)各種控制組件及線槽位置后，要依照?qǐng)D紙所示尺寸，標(biāo)定孔位，鉆孔后將固定螺絲旋緊到基座牢固為止。在裝上電源供應(yīng)模塊前，必須同時(shí)注意電源線上的接地端有無與金屬機(jī)殼連結(jié)，若無則須接上。接地不好的話，會(huì)導(dǎo)致一系列的問題，靜電、浪涌、外干擾，等等。由于不接地，往往PLC也能夠工作，因此，不少經(jīng)驗(yàn)不足的工程師就誤以為接地不那么重要了。這就像登山的時(shí)候，沒有系上保護(hù)纜繩一樣，雖然你正常前進(jìn)的時(shí)候，保護(hù)纜繩沒有任何作用，但一旦你失足的時(shí)候，沒有那根繩子，你的生命就完結(jié)了。PLC的接地，就相當(dāng)于給PLC系上保護(hù)纜繩。

Apollo Conbraco 1" 2PC. Ball Valve, 71-505-01, Used, Warranty

NEW Parker Mini Water Shutoff Valve, # MV608 1/2 04,  WARRANTY

Vickers Valve, DGMFN-3-X-A1W-B1W-20-JA, USED, WARRANTY

SMC Limit Switch Valve w/ Rotary Cam, Model# VM2, Used, WARRANTY

2 - NEW SMC AKB03B-N03S check valve, bushing type, AKH/AKB CHECK VALVE, NNB

MAC 113B-591AAAA Solenoid Valve, 24 VDC, 2.5 , Used, WARRANTY

Numatics Pneumatic Valve,  # L12BA452O, Used,  WARRANTY

Parker B320BB549C 1/8 DS 24VDC Double Solenoid Valve, Used, WARRANTY

Ross Lockout & Exhaust Valve, 1523 C 4002, Used, WARRANTY

Flutec Flow Control Valve, DRV-08-01.1/12, DRV08011/12, Used, Warranty

Rexroth Hydraulic Check Valve No. Z1S 6 P2-32/V, USED, WARRANTY

NEW Parker Polycarbonate Bowl Kit, # PS205, WARRANTY 

Ross Flow Control Valve, 1968B4007, Used, WARRANTY

 SMC 4 Position Manifold * * * NICE * * * USED * * * WARRANTY * * *

Festo Solenoid Valve JMFH-5/2-D-1 C, 1) MSFG-24/42-50/60-DS-OD *USED * WARRANTY*

Sun Hydraulics DBL 91B3-A2, Solenoid Valve Body,  Used, WARRANTY

NEW SMC Pneumatic Solenoid Valve, # VSS8-8-FJG-D-3EZ-V1, WARRANTY

Festo Pneumatic Silencer, U-1-B, Used, Warranty

Bosch Directional Control Valve, 9810231500, 4600 PSI, USED, WARRANTY

Rexroth Bosch Sub-Base, P68421, Used, Warranty

Numatics Solenoid Valve, 031SS5004000061,150 PSIG, Used, WARRANTY

Numatics Endplate Connector # 239-1174, Used, WARRANTY

Nachi Modular Valve, OCP-G01-W1-21, USED, WARRANTY

Mac Solenoid Air Valve Mod 92B-BAF-GAA-DM-DDAP-1DM, USED, WARRANTY 

Rexroth Bosch Pneumatic Sub-Base Manifold Unit, 1 825 503 813, Used, Warranty

NEW Toyo-Oki Mini Brass Shutoff Valve, # PG-SA-02, 2B0,  WARRANTY

Festo Pneumatic Valve, # VL-5/2-D-1-FR-C, Used,  WARRANTY

Mac Solenoid Air Valve, 92B-AAB-000-DM-DDAP-1DM, USED, WARRANTY

Mac Flow Control Valve, R2-02-24, USED, WARRANTY

SMC Air Catch Sensor, ISA15, 12-24VDC PNP 80mA, Max Press 200kPa, Used 

Numatics Pneumatic Valve Actuator, 254SA415k, 120V, USED, WARRANTY

Jamesbury SS 1/4" Ball Valve, 9FBT6, 2000CWP, 1000 psi, WSP-150 psi, Used

MAC 712C-12-PI-111CA SOLENOID VALVE w/ PIR-111CAAA, USED, WARRANTY

Numatics Regulator 081RS400J and Manifold, Used, Warranty

Numatics Manifold, # HH-2, USED,  WARRANTY

Numatics Manifold, # HH-1, USED,  WARRANTY

Mac Solenoid Air Valve, 92B-AAA-BJB-DM-DDAP-1DH, USED, WARRANTY

Toyo Oki Check Valve, # HD1-43SGS-BGA-025-LA4, USED, WARRANTY

 SMC 3 Position Manifold * * * NICE * * * USED * * * WARRANTY * * *

SMC Solenoid Valve, VSS8-6-FG-D-3EZ-V1, USED, WARRANTY

Numatics Pressure Switch, # PS180CAN02, Used,  Warranty

MAC Single Pressure Sandwich Regulator, # PR82A-GADA, Used,  WARRANTY

Koganei Ltd. Solenoid Air Valve, Mod# 050-4E1, 100 VAC, Used, WARRANTY

Parker Coil, P0160749, 24 VDC, 65V, 50/60Hz, USED, WARRANTY

Rexroth Bosch End Cap, *P68422, P68422, Used, Warranty

SMC 3 Port Direct Operated Solenoid Valve, VT307, 100VAC, Used, WARRANTY

Numatics Single Valve, 081SA400M, .26 Amps, 24 VDC, Used, WARRANTY

Sperry Vickers Check Valve, DGMI-3 PP BW 20, Used, WARRANTY

SMC Solenoid Valve, VP4224M, USED, WARRANTY

Mac Pneumatic Valve, 113B-501AAAA, Used, WARRANTY 

Schrader Scovill 3 Way Solenoid Valve, 74304-8115, Warranty

 LOT of 2 - Festo Pneumatic Silencer, U1/2B, Used, Warranty

SMC Pneumatic Manifold Body, For 2 Solenoids, VQ 4000, Used, WARRANTY

SMC Mechanical Valve, VM 130-01, USED, WARRANTY

MAC Valve, 256-111C, USED, WARRANTY

Numatics Pneumatic Regulator, R14R-02, Used, WARRANTY

Mac Solenoid Air Valve Mod# 92B-AAB-000-DM-DJAP-1DG

SMC Regulator, AR2060 W/ Guage, USED, WARRANTY

SMC Modular Regulator,AR2500-02BG,  NO PRESSURE GAUGE, Used, WARRANTY

Numatics Solenoid Valve, 122BA400M000061, 24 DCV, 150 PSIG, Used, WARRANTY

Numatics Solenoid Valve, 123BA4Z2MN00061, 24 VDC, 150 PSIG, Used, WARRANTY

MAC Solenoid Air Valve Pressure Regulator # PR82A-AABA, USED, WARRANTY

CoilHose Pneumatic Filter/Regulator, MFC2BEN, Used, Warranty

Norgren Lockout Valve, T73E-3AA-P1N, Used, Warranty

Festo Valve, HE-D-MINI, 360 720, 1/4" NPT, 230 psi Max, Used, Warranty

Ross 1/4" NPT Flow Control Valve, P/N W1968A2004, Used, WARRANTY 

Mac Solenoid Air Valve, # 92B-AAF-000-DM-DDAP-1DM9, USED, WARRANTY

SMC Solenoid Valve VTW 3105, USED, WARRANTY

Koganei Ltd. Solenoid Air Valve, Mod# 050E1, 100 VAC, Used, WARRANTY

Numatics Lubricator Valve, L21L-03, USED, WARRANTY

Parker Hydraulic Regulator, L95423166 W, USED, WARRANTY

Burkert Solenoid Valve, 00462212, 24V,115 PSI, Used,  WARRANTY

SMC Spacer Solenoid Valve, VVFS2000-22A, VVFS200022A, * * * WARRANTY * * *

Numatics Manifold, Double Z Board, # 006-195B, Used,  WARRANTY

SMC Lock Out Relief Valve, NVHS5500-N06-X1, USED, WARRANTY

Numatics Valve, Model 553JA4150 Replace # 554AJ400O, USED, WARRANTY

MAC PNEUMATIC AIR VALVE 92B-000-BJ3

MAC Solenoid Valve, # 1111A-111, 20 - 150 PSI, USED, WARRANTY

SMC Spacer Solenoid Valve, VV71-P-03, VV71 P 03, VV71P03, * * * WARRANTY * * *

SMC Pneumatic Manifold Body, VQ 4000, Used, WARRANTY

SMC Solenoid Valve, SYJ 312, 12 VDC, USED, WARRANTY

Numatics Valve Solenoid, # 225-285B, 6.3 Watts, 24 VDC, Used, WARRANTY

Vickers Directional Check Valve, # DGMDC 3 Y BK 41, USED, WARRANTY

Sperry Vickers Check Valve, DGMDC 3 PYL 20, Used, WARRANTY

Mac Solenoid Valve # PME-591DAAG, 2.5 Watts, Warranty

Festo FRZ-1/2-S-B Manifold, USED, WARRANTY

SMC Modular Regulator,AR2000,  NO PRESSURE GAUGE, Used, WARRANTY

 SMC 3 Port Double Check Valve, VR1350, 0.7MPs, USED,  WARRANTY 

Wilkerson Safety Shutoff Valve, V08-02-0000, WARRANTY

Numatics Solenoid Valve, 062BA415M, Used, WARRANTY

NEW Plug Socket, 33295 MSSD-V, Warranty

SMC SUP Relocation Block, VV71-P-02, Used, WARRANTY

Kitamura MyCenter 1 Toolchanger Arm Unit, Mycenter-1I, Used,  WARRANTY

Kitamura PC Circuit Board, # 3E-99652B, Used, WARRANTY 

Fanuc PC Control Board, # A16B-1200-0220 / 03B, Used, WARRANTY

Kitamura Mycenter 1 Table Left Plastic Way Cover, Used

Kitamura Mycenter 1 Table Right Plastic Way Cover, Used

Fanuc PC Board, A20B-0008-0640 / 02A, Used,  WARRANTY

Kitamura PC Circuit Board, # 3-E99501, Used, WARRANTY 

Fanuc PC Board, A20B-0008-0630 / 02A, Used, WARRANTY

Kitamura MyCenter 1 Circuit Board, Kitamura 401B, Used, WARRANTY 

Kitamura MyCenter 2 Toolchanger Arm Unit, Mycenter-2XI, Used,  WARRANTY

Kuroda HI-ROTOR Hydraulic Motor, HRN-30D, Off Kitamura VMC, Used, WARRANTY

Kitamura Mycenter 2X Saddle escopic Way Covers, Used

Kitamura PC Board, 3-E97705, Off Mycenter 2X VMC, Used, WARRANTY

18" Cushman 4-Jaw Lathe Chuck, 4-1/4" Hole, Universal / Independent, Used, Nice

Autoblok / SMW 12" 3-jaw Power Chuck, 305 RC, Off Okuma, Used, WARRANTY

NEW Howa Machinery 6-1/2" Draw Down Power Chuck, # H011MB6Z,  WARRANTY

Magnetool Fine Line Electromagnet and Controller, # ECT-824, Used,  WARRANTY

NEW Naka Seiki Toyo 3-1/2" Power Chuck, # 64KBP6431, 3RJ-F312MZ,  WARRANTY

NEW Riken Collet Chuck w/ Accessories, AD-40E, NIB, O-CHS-244, 7H003012

6-1/2" Kitagawa 3 Jaw Power Lathe Chuck, CNC Lathe, # PU206, Used, WARRANTY

10" Kitagawa 3 Jaw Power Lathe Chuck, # HJA6-10, A6 Spindle Mount, Used 

11" 3-Jaw / Face Plate Comb. Power Chuck, A6 Mounting, Used, WARRANTY

NEW Riken Collet Chuck, AD-40E, NIB, O-CHS-244, 7H003012

10" SMW / Schunk 3-Jaw Power Chuck, THW 265-71, Used, WARRANTY

11" 3-Jaw / Face Plate Comb. Power Chuck, Plain Back Mounting, Used, WARRANTY

6" x 18" x 2-3/4" Hitachi Electro-Magnetic Chuck w/Controller, HL-618C, WARRANTY

15" Cushman 3-Jaw Lathe Chuck, D1-6" Camlock, Used, WARRANTY

6" MMK 3-Jaw Power Lathe Chuck, HA5-6V, A5 Spindle Mounting, Used, WARRANTY

6" x 18" x 3-1/4" Hitachi Electro-Magnetic Chuck w/Controller, HR-618C, USED

10"  SCA 3-Jaw Lathe Chuck, A8 Mounting, Made in Sweden, Used, WARRANTY

15" Royal Hydraulic Chuck, Model# 410-15-200, A2-11 Mount, Used, WARRANTY

12" Pratt Burnerd D1-8" Camlock 3-Jaw Lathe Chuck, # 55D8TJ, Used, WARRANTY

MicroCentric CB65-D Collet Chuck off Okuma LT25 CNC Center, Mfg'd: 1998

10" Bison 3-Jaw Lathe Chuck, D1-6" Camlock, 3" Hole, 3245-10"-6, Used, WARRANTY

8" x 14" x 4-5/8" Walker Electro-Magnetic Univ. Tilting Chuck, Used, WARRANTY

6" x 18" x 3-13/16" Magna-Lock Electro-Magnetic Chuck, 115 VDC, Used

10" Poland 3-Jaw Lathe Chuck, D1-6" Camlock, Puum-S10D6ZD, Used, WARRANTY

10" A8 Spindle Mount, 3-Jaw Lathe Chuck, MADE IN SWEDEN, Used, WARRANTY

8" Poland 3-Jaw Lathe Chuck, D1-5" Camlock, Puum-8D-5Z, Used, WARRANTY

10" Skinner Plain Back 3-Jaw Lathe Chuck, # 3910-53, Used, WARRANTY

12" Union D1-6" Camlock 3-Jaw Lathe Chuck, # 363-K, Used, WARRANTY

Barnes Kleenall Chip Filter, # RD-112H, Mfg'd: 1996, Dual Pumps, Used, WARRANTY

Jorgensen Chip Conveyor, 9" Wide x 96" Flat, Mfg'd: 1989, Used

Chip Conveyor, 23" Wide x 48" Flat, Type# 3571, Mfg'd: 1993, Used

Mayfran Chip Conveyor, 7" Wide, 96" Flat, Wasino LJ-10, Used, WARRANTY

Metzgar Gravity Conveyor, 46-1/2" Wide x 102" Length, 1-7/8" Dia. Rollers, Used

Versa Conveyor 107" x 6 1/2" w/ Dodge Tiger Reducer and Leeson Motor,  WARRANTY

NEW OLD STOCK REXNORD 10' CONVEYOR, SS 881TAB-K450, NIB

NEW Itoh Power Moller Motorized Roller, PM486BS-20-519-3-230, 230V, NIB 

NEW Itoh Electric Power Moller Motorized Roller, PMA-10-200-V2, 200V, NNB

NEW Itoh Power Moller Motorized Roller, PM486BU-10-250-3-200-DR-JH, 200V, NNB 

Gravity Roller Conveyor 39" L x 3/4" W Plastic Rollers, Aluminum Frame, Used

Maruyasu / Itoh Electric Power Moller Motorized Roller, PMA-15-200-V2, 200V