描述
PLC中的面向对象编程的核心就是黑匣子编程,针对Step7,我们使用FB去实现每一个对象的控制,控制逻辑、报警处理、信号交换全在FB中,对于应用设计人员,不需要明白里面的代码实现,只需要了解该FB的功能以及如何使用好它就行,这样对于应用程序人员的编程能力要求大大降低,对于编程只不过是遵循架构,拷贝代码,改变输入输出条件而已。
那么调试呢?很多人认为使用FB编程的最大麻烦就是FB的多次调用后,根本无法诊断这些代码,从技术层面上讲确实如此,我们除了从背景DB上查看信息外,是无法在它多次被调用后监控代码的,但我已说过,这是黑匣子编程,我们不需要诊断这些代码,只需要知道什么样的输入、什么样的参数设定导致什么样的输出就行,代码的逻辑与功能好坏是由标准库开发人员负责的,这就要求标准开发人员需要对他设计的功能块在不同条件下进行不同的测试,保证无误,还需要编写完整、详尽的功能说明文档,以便于应用设计人员了解这些块,标准架构并不是制定出来就一劳永逸的,针对千变万化的工程,它是需要不断完善和修订的,这也是一个工程公司可以实实在在进行知识积累的地方。程序不仅需要给调试人员使用,而且用户(设备维护人员)也需要了解,如果把完整的标准库文档给用户,可能曾在技术外泄的可能,若不给,对他们诊断设备可能曾在困难,这就需要标准制定人员制作另外一分文档,即设备维护文档,其知识的透漏以用户能够使用程序进行诊断为限。
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主营DCS系统配件
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RADIAL PISTON PUMP # H20H-F2 AND H20L-F2
RADIAL PISTON PUMP # HEO55-F2
VICKERS VANE PUMP REMAN VVB032F-PW-20CBW12/V101S5S11A20
SAUER SUNDSTRAND 90M100 HYDRAULIC PISTON MOTOR
RACINE HYDRAULIC PUMP MODEL#PSV-PSAF-15ERM-56 REMAN/NEW
RACINE HYDRAULIC PUMP MODEL#PSV-PSAF-10HRM-56 REMAN/NEW
RACINE HYDRAULIC PUMP MODEL#PSV-PSSF-10HRM-56 REMAN/NEW
RACINE HYDRAULIC PUMP MODEL#PSV-PSSF-15ERM-56 REMAN/NEW
CONTINENTAL PUMP NEW #PVR1530B10RFO521D
RACINE PSQ-PSSF-09ERM-20 HYDRAULIC VANE PUMP NEW
CONTINENTAL VALVE VS100M-3A-G3B5HL2-60L-G D10 – 1 1/4
NORTHMAN VALVE SW-G10-C4-A120-10 NEW SURPLUS D10 -1 1/4
CONTINENTAL PUMP NEW #PVR68B06RFO12H
BOSCH 0811-403-114 NG6 PROPORTIONAL FLOW CONTROL
REBUILT RACINE VANE PUMP # PVS-PSSO-12ER-01
NACHI FLOW CONTROL # FG10-373-20 NEW NEVER USED
CONTINENTAL VANE PUMP MODEL# PVR1520B15RMP13JY5518-1
VICKERS HYDRAULIC VANE PUMP REBUILT #45V42A1C22R
CONTINENTAL MANIFOLD MOUNTED VANE PUMP
OIL GEAR PISTON PUMP NEW SURPLUS W/1 YEAR WARRANTY
REXROTH PROPORTIONAL DIRECTIONAL VALVE REMAN
ROTAC HYDRAULIC ROTARY ACTUATOR MODEL# MPJ34-2V REMAN
VICKERS REMAN VANE PUMP #V2106A DOUBLE SHAFT
BOSCH VALVE NG6 PROPORTIONAL RELIEF MODEL#0811-402-030
BOSCH D05 DIRECTIONAL VALVE #9810-232-138 110V COILS
VICKERS PUMP REMAN MODEL# V104-G-10 W/1 YEAR WARRANTY
VICKERS VANE PUMP REBUILT FIXED DISP. #25VQ12A11B20
PVR1-6B10-RMP6H2 NEW CONTINENTAL PUMP
PVR1-6B10-RMP6H2 NEW SURPLUS CONTINENTAL PUMP
HEYPAC HYDRAULIC DOUBLE ACTING PUMP #GX40-NSNW1 REMAN
RELIANCE ELECTRIC MOTOR NEW ID#P56H1332H
GRESEN DIRECTIONAL VALVE
PARKER D63W1D4Y33 D08 DIRECTIONAL VALVE REMAN
PARKER D63W1B45Y36 D08 DIRECTIONAL VALVE REMAN
PARKER VALVE #D63W1C456Y34 REMAN D08 DIRECTIONAL
VICKERS HIGH SPEED VANE MOTOR NEW SURPLUS #M2335751C13
PACO PUMP CAT# 10125011000612212 SER#SPE15049-1002 NEW
PARKER HYDRAULIC ACTUATOR HTR9-18030-BD11W-A NEW
TUTHILL HYDRAULIC PUMP MODEL# 1RC-RH X191A
RACINE VALVE #FE1-PBAE-T06W-10 PRESSURE CONTROL NEW
MOOG VALVE SELLING AS-IS MODEL#D642-515A/SN#D601
MOOG VALVE SELLING AS-IS MODEL#D644-519/SER#D284
MOOG VALVE SELLING AS-IS MODEL#D642-515A/SER#D647
WANDFLUH HYDRAULIC VALVE MODEL# AMW4D102 NEW
WANDFLUH HYDRAULIC VALVE D03 MODEL# AMW4D62 NEW
PARKER/NICHOLS MOTOR NEW SURPLUS #050-2-AS-H8-1248
CHARLYNN/EATON HYDRAULIC MOTOR #103-1022-010 NEW
CO-AX VALVE PART#FL06680/MOD.#VSVF502C216GGD50120VXXXP1
VICKERS VALVE#DG4V32AMS6UH760 NEW VALVES NEVER USED
PARKER HYDRAULIC CYLINDER NEW #CC2HLU18AC 3000PSI
WHITE HYDRAULICS MOTOR#200250A1102AAAAA NEW SURPLUS
VICKERS HTLS MOTOR NEW SURPLUS # HMA-1030-APO10
VICKERS VALVE D03 NEW SURPLUS MODEL#DG4V32AMFPA5WLB660
VICKERS D03 VALVE NEW SURPLUS #DG4V3S6NMFPA5WLH560
VICKERS VALVE D03 NEW SURPLUS DG4V3S6CMFPA5WLB560
VICKERS VALVE#DG4S2LW012AB60 DIRECTIONAL VALVE
REXROTH VALVE MODEL# 4WE6D60OFEG24N9Z45 D03 REMAN
NACHI VALVE MODEL# SA-G01-C5-C1-30 D03 DIRECTIONAL
VICKERS VANE PUMP REMAN MODEL#V102P2P1C20
VICKERS VANE PUMP REMAN MODEL#V102P3P10A20
VICKERS VANE PUMP REMAN MODEL#V102P3P10A20
VICKERS VANE PUMP REMAN MODEL#V102P3P1D20 FIXED PUMP
VICKERS HYDRAULIC VANE PUMP REMAN MODEL#V102P2P1C20
PARKER AIR CYLINDER SER. 2AN #02.00KJTC2ANU34A39A1.00
PARKER HYDRAULIC CYLINDER SER. 2H #01.50CJJ2HTV19AC2.00
PARKER HYDRAULIC CYLINDER SERIES 2H #02.00C2HLT14A2.000
PARKER HYDRAULIC CYLINDER SERIES 3L #02.50CD3LLU14AC5.0
BOSCH VALVE 0811-101-272 RELIEF MODULE D05 PATTERN NEW
REXROTH CONTROL COVER MODEL#LFA25H4-70/F/12 NEW SURPLUS
BOSCH UNIVERSAL CHASSIS 2 SLOT CARD HOLDER
REXROTH DIRECTIONAL VALVE REMAN
WANDFLUH HYDRAULIC VALVE D05 MODEL# AMW42100A NEW
BOSCH VALVE 9810-161-190 RELIEF MODULE D03 PATTERN
PARKER D3W4CNJC56 DIRECTIONAL VALVE
VICKERS VANE PUMP MODEL#V201P6S1A11 REMAN
HJC CL-12 SNOWMOBILE HELMET ADULT SIZE LIKE NEW
PARKER DIRECTIONAL VALVE NEW IN BOX
PARKER VALVE #D41FHB61F2VB0035 USED AS-IS
PARKER FLOW CONTROL NEW IN BOX
FESTO PNEUMATIC CYLINDER DNC-50-50PPV-A NEW
FESTO PNEUMATIC CYLINDER DNC-40-151-PPV-A NEW
ROSS PNEUMATIC VALVE W7016A2332 NEW
ROSS PNEUMATIC VALVE MODEL# 2751A5001 NEW
NACHI HYDRAULIC VALVE MODEL# SA-G01-C6-C115-E31 NEW DO3
PARKER CYLINDER NEW NEVER USED.
BOSCH #0521-220-004 NEW HYDRAULIC VALVE
FESTO PNEUMATIC CYLINDER NEW DNC-50-50PPV-A
FESTO PNEUMATIC CYLINDER NEW DNC-40-151-PPV-A
WEBSTER PUMP MODEL#30B1J3HX-7L REMAN W/ 1 YEAR WARRANTY
PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗
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