1785-L20B
1785-L20B
PLC 定时器; 网络结构;
1785-L20B
PLC 定时器; 网络结构;
摘要：从S7 - 200 系列PLC 定时器最优化设计的角度出发, 阐述了以控制网络、指令盒、状态位输出三个基本网络作为定时器设计规范, 以及定时器的定时、复位和网络结构的具体情况, 三网络结构具有网络结构清晰, 网络功能确切、程序的可读性强等优点.
可编程控制器( PLC) 是一种自动化控制装置. 常用的编程语言为梯形图语言( LAD) , 定时器指令是PLC 编程的重要指令, 掌握好定时器的使用方法, 对编程水平的提高有着十分重要的意义, 定时器设计格式的规范化, 可以优化定时器设计程
PLC；变颊器；恒压供水；系统改造1785-L20B
摘要：某住宅小区是我校机电及物业管理班学生实习单位，该小区的绿化供水系统原采用电接点压力表控制单台水泵的运行方式，因该系统使用频率高，启动频繁，故障频率高，浪费人力物力。为降低设备的故障率，延长设备的使用寿命，节省设备运行费用。对该系统改用PLC控制的变频调速方式，进行恒压供水。该方案既能自动完成PID闭环运算及各泵的软启动及无冲击切换，使水压平稳过渡。同时又能在PLC故障、变频器敌障、系统检修、水池清洗时又可自由切换到手动控制。1785-L20B
小区绿化面积达75000m ．绿化喷淋El均用水量约300m 。夏季少雨天气最高用水量7Om似。小区引水工程原
由两级泵组组成． 两级泵组之间建有50m，的低位调节池。一级泵房由两台7．5kW 流量为100m3／H的水泵(一用一备)组成．抽取小区附近河道河水人调节池；二级泵房抽取调节池中的水供管网各喷淋用水点，改造前的二级泵房供水系统如图1所示，该系统由两台功率为7．5kW，流量为50m3／H的水泵(一用一备)，电接点压力表和压力罐组成的稳压供水控制系统．将调节池的水送入小区各用水点。该系统投入使用已多年，因启动频繁，故障率越来越高，有时每周都要维修，对小区绿化工作带来很大的影响。根据该二级泵房的使用特性及小区喷淋系统的实际情况，结合市场上恒压供水系统的技术性能和优良的性价比，建议小区二级泵房改用PLC及变频器进行恒压控制，得到了小区开发公司同意。
Delta Design 9023 Environmental Temperature Test Chambe
59.25" D x 41.5" Dia High Performance 316 Stainless Ste
Thermotron S-16C Environmental Temperature Test Chamber
Pink 11.5" ID x 16.5" D Stainless Steel Vacuum Chamber
3 cu. ft.~ Aluminum Vacuum/Degassin?g Chamber w/Window &
Tenney T-14-C/M Environmental Chamber w/Through Doors 1
Thermotron S-16 Mini-Max S-16C Environmental Temperatur
Tenney T10RC-1.5 Temperature & Humidity Chamber +Opt.
Thermotron F-12-CHV-5-5 1785-L20B
Thermotron S-16 Mini-Max S-16C Environmental Temperatur
Despatch 924-1-6-D-0-120 CO2/LN2 Temperature Test Chamb
Cutler-Hammer Eaton 9800 Unitrol Size 5 400 Amp 42" MCCB MCC Bucket 400A Sz5
Cutler-Hammer Eaton Unitrol F10 250 Amp Breaker Feeder MCCB MCC Bucket 18" 250A
Cutler-Hammer Eaton Unitrol F10 250 Amp Breaker Feeder MCCB MCC Bucket 250A 18"
Cutler Hammer Unitrol 800 Amp Main Breaker MCC Bucket 24" MCCB MA3800F 600A Trip
Cutler Hammer F10 Unitrol Size 4 AN16NNO 250 Amp Breaker MCCB MCC Bucket 30"
Cutler Hammer Unitrol F10 Size 4 Breaker A10FN0 MCC Bucket 100 Amp MCCB 24"
Cutler-Hammer Eaton Unitrol F10 150 Amp MCCB Size 4 A11FNO MCC Bucket
Cutler Hammer F10 Unitrol Size 3 A10ENO 100 Amp Breaker MCCB MCC Bucket 100A 24"
Cutler-Hammer Eaton Unitrol F10 80 Amp Dual Breaker Feeder MCCB MCC Bucket
Cutler-Hammer Unitrol F10 Size 3 100A Breaker MCC Bucket 24" MCCB 100 Amp Sz3
Cutler-Hammer Eaton Unitrol F10 30/80 Amp Dual Breaker Feeder MCCB MCC Bucket
CH/Eaton Unitrol F10 80 Amp Dual Breaker Feeder MCC Bucket Cutler Hammer MCCB
Cutler-Hammer Eaton Unitrol F10 130 Amp Breaker Feeder MCCB MCC Bucket 12" 130A
Cutler-Hammer Eaton Unitrol F10 80 Amp Breaker Feeder MCCB MCC Bucket 6" 80A
Cutler-Hammer Eaton Unitrol F10 50/30 Amp Dual Breaker Feeder MCCB MCC Bucket
Cutler Hammer Unitrol F10 Size 3 Breaker A10EN0 MCC Bucket 100 Amp MCCB 24" 1785-L20B
Cutler-Hammer Unitrol F10 50 Amp Dual Breaker Feeder MCCB Eaton 50A MCC Bucket
Cutler Hammer Unitrol F10 Size 3 Breaker A10EN0 MCC Bucket 60 Amp MCCB 24"
Cutler-Hammer Eaton Unitrol F10 30/80 Amp Dual Breaker Feeder MCC Bucket MCCB
Cutler-Hammer Eaton Unitrol F10 80 Amp Breaker Feeder MCCB MCC Bucket 12" 80A
Cutler-Hammer Eaton Unitrol F10 130 Amp Breaker Feeder MCCB MCC Bucket 14" 130A
CH F10 Unitrol MCC Bucket MCCB Breaker 50 Amp Size 2 Square D Reversing Starter
Cutler-Hammer Eaton Unitrol F10 80 Amp Breaker Feeder MCCB MCC Bucket 12" 80Amp
Cutler Hammer F10 Unitrol Size 2 50 Amp MCP Bucket MCCB CH
Cutler-Hammer Eaton Unitrol F10 30 Amp Dual Breaker Feeder MCCB MCC Bucket
Cutler Hammer F10 Unitrol Size 2 A10DNO 50 Amp Breaker MCCB MCC Bucket HMCP
Cutler Hammer F10 Unitrol Size 2 AN16GNO 50 Amp Breaker MCCB MCC Bucket 24 inch
Cutler Hammer F10 Unitrol Size 2 AN16GNO 50 Amp Breaker MCCB MCC Bucket HMCP 50A
Cutler-Hammer Eaton Unitrol F10 30 Amp Dual Breaker Feeder MCCB MCC Bucket 18"
Cutler Hammer F10 Unitrol Size 2 AN16GNO 30 Amp Breaker MCCB MCC Bucket
CH F10 Unitrol MCC Bucket MCCB Breaker 50 Amp Size 2 Square D Starter 8536-SDO1
Cutler-Hammer Eaton Unitrol F10 30 Amp Breaker Feeder MCCB MCC Bucket 6" 30A
Cutler Hammer F10 Unitrol Size 2 A10DNO 30 Amp Breaker MCCB MCC Bucket HMCP
Cutler Hammer F10 Unitrol Size 1 AN16DNO 30A Breaker MCCB MCC Bucket Reversing
Cutler-Hammer Eaton Unitrol F10 30 Amp Dual Breaker Feeder MCCB MCC Bucket 12"
Cutler Hammer F10 Unitrol Sz Size 1 MCCB CH 30 Amp A
Cutler Hammer Unitrol Size 1 MCC Bucket 7 Amp 2 Speed
Cutler-Hammer F10 Unitrol Size 2 50 Amp 18" Breaker MCC Bucket MCCB C-H Sz2 50A
Cutler Hammer Unitrol Size 1 Reversing MCC Bucket 7 Amp
Cutler Hammer F10 Unitrol Size 2 A10DNO 30 Amp Breaker MCCB MCC Bucket
Cutler Hammer F10 Unitrol Size 2 A10DNO Breaker 50 Amp MCC Bucket MCCB CH
Cutler Hammer F10 Unitrol Size 1 A10CNO 30 Amp Breaker MCCB MCC Bucket
Cutler-Hammer Eaton Unitrol F10 30 Amp Breaker Feeder MCCB MCC Bucket 12" 30A
Cutler Hammer Unitrol Size 1 Reversing MCC Bucket 3 Amp
Cutler Hammer Unitrol Size 1 MCC Bucket 3 Amp 2 Speed
Cutler Hammer F10 Unitrol Size 1 A10CNO 30 Amp Breaker MCCB MCC Bucket HMCP
Cutler Hammer Unitrol F10 130A Feeder MCC Bucket 24in CH F-10 130 Amp MCCB 24"
Cutler Hammer F10 Unitrol Size 1 AN16DNO 30 Amp Breaker MCCB MCC Bucket HMCP
Cutler Hammer F10 Unitrol Size 2 A10DNO Breaker MCC Bucket MCCB CH
Cutler Hammer Unitrol Size 1 Reverse MCC Bucket 7A mccb
Cutler-Hammer Unitrol F10 Dual 100 Amp A Feeder MCCB
Cutler Hammer Unitrol F10 Dual 130/70 Amp MCCB Feeder
Cutler Hammer Unitrol Size 1 Contactor MCCBucket 15 Amp
Cutler Hammer F10 Unitrol Sz Size 1 MCCB CH 15 Amp A
Cutler Hammer Unitrol Size 1 Starter MCCB 3 Amp NEW
Cutler Hammer F10 Unitrol Size 1 AN16DNO 30A Breaker MCCB MCC Bucket no heaters
Cutler-Hammer Unitrol F10 Dual 70/100 Amp Feeder MCCB
Cutler Hammer CH F10 Unitrol Sz Size 1 MCCB 15 Amp A
Cutler Hammer Unitrol Size 1 Reverse MCC Bucket 3A mccb
Square D Unitrol Size 1 Starter MCC Bucket 7 Amp
Cutler Hammer Unitrol F10 100 Amp Feeder MCC Bucket
Cutler-Hammer CH Unitrol F10 Dual 70 Amp A Feeder MCCB
Cutler Hammer F10 Unitrol Size 1 AN16DNO 15 Amp Breaker MCCB MCC Bucket HMCP
Cutler Hammer Unitrol Size 0 Starter Size 1 Reversing Contactor MCC Bucket 7 Amp
Cutler Hammer F10 Unitrol Size 1 AN16DNO 7 Amp Breaker MCCB MCC Bucket HMCP
Cutler Hammer F10 Unitrol Sz Size 1 MCCB CH 7 Amp
Cutler Hammer F10 Unitrol Size 1 AN16DNO 3 Amp Breaker MCCB MCC Bucket HMCP
Cutler Hammer F10 Unitrol Size 1 MCC Bucket 3A CH Sz1 F-10 3 Amp MCCB
Cutler Hammer Unitrol F10 Dual 100 Amp A Feeder MCCB
Cutler Hammer Unitrol Size 1 Starter MCC Bucket 7 Amp
Cutler-Hammer Unitrol F10 Dual 70A Feeder MCC Bucket CH MCCB 70 Amp F-10 C-H
