最近中文字幕在线mv视频在线,中文字幕无码家庭乱欲,一区二区伊人久久大杳蕉 ,亚洲综合国产一区,夜夜爽www

選型注意事項

  S7-300PLC的選型原則是據(jù)生產(chǎn)工藝所需的功能和容量進行選型，并考慮維護的方便性、備件的通用性，以及是否易于擴展和有無特殊功能等要求。選型時具體注意以下幾方面：

  (1)有關(guān)參數(shù)確定。一是輸入/輸出點數(shù)(I/O點數(shù))確定。這是確定PLC規(guī)模的一個重要依據(jù)，一定要根據(jù)實際情況留出適當(dāng)余量和擴展余地。二是PLC存儲容量確定。注意當(dāng)系統(tǒng)有模擬量信號存在或要進行大量數(shù)據(jù)處理時，其存儲容量應(yīng)選大一些。

  (2)系統(tǒng)軟硬件選擇。一是擴展方式選擇，S7-300PLC有多種擴展方式，實際選用時，可通過控制系統(tǒng)接口模塊擴展機架、Profibus-DP現(xiàn)場總線、通信模塊、運程I/O及PLC子站等多種方式來擴展PLC或預(yù)留擴展口;二是PLC的聯(lián)網(wǎng)，包括PLC與計算機聯(lián)網(wǎng)和PLC之間相互聯(lián)網(wǎng)兩種方式。因S7-300PLC的工業(yè)通信網(wǎng)絡(luò)淡化了PLC與DCS的界限，聯(lián)網(wǎng)的解決方案很多，用戶可根據(jù)企業(yè)的要求選用;三是CPU的選擇，CPU的選型是合理配置系統(tǒng)資源的關(guān)鍵，選擇時必須根據(jù)控制系統(tǒng)對CPU的要求(包括系統(tǒng)集成功能、程序塊數(shù)量限制、各種位資源、MPI接口能力、是否有

  PROFIBUS-DP主從接口、RAM容量、溫度范圍等)，并好在西門子公司的技術(shù)支持下進行，以獲得合理的選型;四是編程軟件的選擇，這主要考慮對CPU的支持狀況，我們的體會是：STEP7V4.0對有些型號的CPU不支持，硬件組態(tài)時會發(fā)生故障出錯，而STEP7V5.0則不存在這種問題。

  二、設(shè)計及使用注意事項

  1. 設(shè)計注意事項

  設(shè)計時主要應(yīng)注意以下幾方面：

  (1)PLC輸出電路中沒有保護，因此在外部電路中應(yīng)設(shè)置串聯(lián)熔斷器等保護裝置，以防止負載短路造成PLC損壞。熔斷器容量一般為0.5A。

  (2)PLC存在I/O響應(yīng)延遲問題，因此在快速響應(yīng)設(shè)備中應(yīng)加以注意。MPI通信協(xié)議雖簡單易行，但響應(yīng)速度較慢。

  (3)編制控制程序時，好用模塊式結(jié)構(gòu)程序。這樣既可增強程序的可讀性，方便調(diào)試和維護工作;又能使數(shù)據(jù)庫結(jié)構(gòu)統(tǒng)一，方便WinCC組態(tài)時變量標(biāo)簽的統(tǒng)一編制和設(shè)備狀態(tài)的統(tǒng)一顯示。

  (4)硬件資源。要合理配置硬件資源，以提高系統(tǒng)可靠性。如PLC電源配電系統(tǒng)要配備冗余的UPS不間斷電源，以排除停電對全線運行的不利影響。又如對電機的控制回路要進行繼電器隔離，以消除外部負載對I/O模塊的可能損壞。另外，系統(tǒng)設(shè)備要采用獨立的接地系統(tǒng)，以減少雜波干擾。

Allen Bradley SLC500-10 Slot Rack w/Proc 1747-L542/C &

Norgren Smart Pumps / Vacuum System - VMS 2110 24 V

Fanuc AC Servo Motor A06B-0127-B175

Allen-Bradley 1794-OB16P Flex I/O Output Module

Olsun 45 KVA 480 HV / Dry type Class AA Transber
415Y/240-120 LV / 3 Phase

Goodyear FHP 4L280 Power Transmission Belt

Fanuc AC Servo Motor A06B-0153-B675

PILZ Pnoz 11 Safety Relay - Emergency Stop Relay

FANUC A16B-1212-0871/?12C POWER SUPPLY

Allen Bradley 1785-L40B/D Controller w/NP5 Kit

Allen-Bradley 1794-ADN Flex I/O DeviceNet Adapter

Allen Bradley AB 104-B110NZ243 Series A Contactor
Reversing Starter

ALLEN BRADLEY 500-DOD920 New In Box / 115-120 V

Honeywell Temperature Controller L456A 1008 NIB
2-Wire 250V Max - 5 Ft copper capiliary 

NIB Honeywell Serviceline Pneumatic Thermostat 
TP970A 2038 4 (Direct acting, range 60-90F)

Allen-Bradley 1794-IB10x086 Flex I/O Combo Module

Allen-Bradley 1794-IB16 Flex I/O Input Module w/TB3Base

Reliance Electric Variable Speed Drive - 125 HP 
pulled from operating Machining center

Fanuc A16B-2201-0891/?03A Ethernet Remote PCB 

Fanuc A05B-2316-C105 3 Slot Back Plane

Fanuc AC Servo Motor A06B-0356-B756

Fanuc Robotics - Brake Release Unit / 6 axis capability

FANUC A16B-3200-0040/?04C MAIN CPU PCB MODULE

FANUC A16B-1212-0931/?03B EMERGENCY STOP CONTROL
BOARD

B74 GATES HI-POWER II VBELT

GATES Part # 3740 Truflex Belt 21/32"x 74" 17x1880mm

FANUC Servo Amplifier Unit A06B-6089-H105

GATES Part # 3740 {Truflex Belt 5L 21/32" x 74"}

CONTROL TECHNIQUES 9500-8603 QUANTUM III DC DRIVE 
15-30 HP

Moog Brushless Sevro Motor / Model 306-131A - NEW

Allen Bradley PowerFlex 70 AC Drive2HP 20AD3P4A3AYNNNN?N

NIB Honeywell Heavy duty Heating/Cooling Thermostat
T6051A 1016

Square D Reversing Starter 8702 Type SDO-2 -New In Box

Square D 1S1FIS 1 KVA General Purpose Transber Used

Allen Bradley AB 104-A75NZ243 Series A Contactor
Reversing Starter

Honeywell Ultraviolet Flame Amplifier - 7800 Series NIB
R7849 A 1023 - Solid State plug in amplifier

Allen Bradley AB 104-B180ND3 Series A Contactor
Reversing Starter

NIB Honeywell Sailswitch - 43A 1003 1 (2wire / 250Vmax)

Allen Bradley 1747-L511/B SLC 5/01 CPU 1747L511 / B

Allen Bradley 1756-DHRIO/B Logix DH+/RIO Communication

Allen Bradley 1747-L541/B SLC 500 5/04 1747L541

Allen Bradley 1747-L542/B SLC 5/04 CPU 1747L542 / B

Reliance 0-51874 Module Static Seq SCCA

Reliance 0-48652 PC Board Meter Calibration

Reliance 0-48652-25 PC Board

Reliance 0-48654 PC Board- AC Tach Rectifier

Reliance 0-49017-83 Card Pack

Reliance 0-51375 PC Board

Reliance 0-51418-4 PC Board

Reliance 0-51419 PC Board Gate Coupling

Reliance 0-51421-3 RC Network

Reliance 0-51425-1 Rectifier - AC Tach

Reliance 0-51426 PC Board- Field Loss

Reliance 0-51444 Driver Board

Reliance 0-51445 Controller Board

Reliance 0-51446 PC Board

Reliance 0-51447-3A PC Board - PC Network- 460V

Reliance 0-51486-24 PC Board

Reliance 0-51486-39 PC Board

Reliance 0-51486-56 PC Board ETR - 14 Pin

Reliance 0-51811-1 Tester Card- Voltmeter- TSTB

Reliance 0-51829-2 PC Board Linear Voltage- LVTC

Reliance 0-51831 PC Board Current Voltage CVTB

Reliance 0-51831-1 PC Board Current Voltage CVTB

Reliance 0-51831-3 PC Board Current Voltage CVTD

Reliance 0-51839-4 PC Board Relay Card IRCE

Reliance 0-51845-1 PC Board Power Supply PRSB

Reliance 0-51846-25A PC Board

Reliance 0-51847 Voltage Detector Board VLDB

Reliance 0-51848-1 PC Board

Reliance 0-51849 PC Board Gate Driver GBCA

Reliance 0-51851-5 PC Board Control Regulator

Reliance 0-51851-6 PC Board Control Regulator- CRCG

Reliance 0-51862-1 PC Board Universal Sum AMP

Reliance 0-51865 (CLDA) PC Board- Current Loop Drive

Reliance 0-51865-1 (CLDB) PC Board- Current Loop Drive

Reliance 0-51865-9 Module Current Loop DRV-CLDK

Reliance 0-51874-2 PC Board Static Sequence SSCC

Reliance 0-51881-1 Circuit Card Ext Term CNTR- ETCB

Reliance 0-51884 LSCA Moldule LOG SIG COND

Reliance 0-51890-6 PC Board DPSG

Reliance 0-51893-2 Field Controller - FCCC

Reliance 0-51893-3 PC Board- Field Exciter FCCD

Reliance 0-51899-2 Control Module Extender Card

Reliance 0-51901-A Armature Reg.

Reliance 0-51902 Driver Card

Reliance 0-51902-5 PC Board

Reliance 0-51903-A Power Supply

Reliance 0-52012 PC Board Gate Driver MaxPak

Reliance 0-52014 PC Board Timed Voltage Reference

Reliance 0-52824 Current Loop Regulator

Reliance 0-54349-2 PC Board Phase