描述
步M301之前有一個(gè)選擇序列的合并,有兩個(gè)前級(jí)步M300和M313,M301的起動(dòng)電路由兩條串聯(lián)支路并聯(lián)而成。M313與M301之間的轉(zhuǎn)換條件為,相應(yīng)的起動(dòng)電路的邏輯表達(dá)式為,該串聯(lián)支路由M313、X13的常開(kāi)觸點(diǎn)和C0的常閉觸點(diǎn)串聯(lián)而成,另一條起動(dòng)電路則由M300和X0的常開(kāi)觸點(diǎn)串聯(lián)而成。步M301之后有一個(gè)并行序列的分支,當(dāng)步M301是活動(dòng)步,并且滿(mǎn)足轉(zhuǎn)換條件X1,步M302與步M306應(yīng)同時(shí)變?yōu)榛顒?dòng)步,這是用M301和Xl的常開(kāi)觸點(diǎn)組成的串聯(lián)電路分別作為M302和M306的起動(dòng)電路來(lái)實(shí)現(xiàn)的,與此同時(shí),步M301應(yīng)變?yōu)椴换顒?dòng)步。步M302和M306是同時(shí)變?yōu)榛顒?dòng)步的,因此只需要將M302的常閉觸點(diǎn)與M301的線(xiàn)圈串聯(lián)就行了。
圖5-43使用通用指令編寫(xiě)的梯形圖
步M313之前有一個(gè)并行序列的合并,該轉(zhuǎn)換實(shí)現(xiàn)的條件是所有的前級(jí)步(即步M305和M311)都是活動(dòng)步和轉(zhuǎn)換條件X12滿(mǎn)足。由此可知,應(yīng)將M305,M311和X12的常開(kāi)觸點(diǎn)串聯(lián),作為控制M313的起動(dòng)電路。M313的后續(xù)步為步M314和M301,M313的停止電路由M314和M301的常閉觸點(diǎn)串聯(lián)而成。
編程時(shí)應(yīng)該注意以下幾個(gè)問(wèn)題:
1)不允許出現(xiàn)雙線(xiàn)圈現(xiàn)象。
2)當(dāng)M314變?yōu)椤?”狀態(tài)后,C0被復(fù)位(見(jiàn)圖5-43),其常閉觸點(diǎn)閉合。下一次掃描開(kāi)始時(shí)M313仍為“1”狀態(tài)(因?yàn)樵谔菪螆D中M313的控制電路放在M314的上面),使M301的控制電路中最上面的一條起動(dòng)電路接通,M301的線(xiàn)圈被錯(cuò)誤地接通,出現(xiàn)了M314和M301同時(shí)為“1”狀態(tài)的異常情況。為了解決這一問(wèn)題,將M314的常閉觸點(diǎn)與M301的線(xiàn)圈串聯(lián)。
3)如果在功能表圖中僅有由兩步組成的小閉環(huán),如圖5-44a所示,則相應(yīng)的輔助繼電器的線(xiàn)圈將不能“通電”。例如在M202和X2均為“1”狀態(tài)時(shí),M203的起動(dòng)電路接通,但是這時(shí)與它串聯(lián)的M202的常閉觸點(diǎn)卻是斷開(kāi)的,因此M203的線(xiàn)圈將不能“通電”。出現(xiàn)上述問(wèn)題的根本原因是步M202既是步M203的前級(jí)步,又是它的后序步。如圖5-44b所示在小閉環(huán)中增設(shè)一步就可以解決這一問(wèn)題,這一步只起延時(shí)作用,延時(shí)時(shí)間可以取得很短,對(duì)系統(tǒng)的運(yùn)行不會(huì)有什么影響。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠(chǎng)DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠(chǎng)藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線(xiàn),變電站綜合自動(dòng)化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè),ACSO,力士樂(lè)等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
Woodward 8236-043 Interface 43027
Woodward 8236-144 Light Panel
Woodward 8236-144D Light Panel
Woodward 8238-002 505E Bulkhead
Woodward 8238-007 505 Bulkhead
Woodward 8238-008 505 Flush Mount
Woodward 8238-009 505E Bulkhead
Woodward 8239-001 DSM Synchronizer
Woodward 8239-002 DSM Synchronizer
Woodward 8239-005 DRFD
Woodward 8239-006 Digital Remote Final Driver
Woodward 8239-007 Digital Remote Final Driver
Woodward 8239-008 Digital Remote Final Driver
Woodward 8239-015 Digital Remote Final Driver
Woodward 8239-016 DRFD CONTROL ASSEMBLY
Woodward 8239-939
Woodward 8240-084 EGB10C governor
Woodward 8250-022 remote servo
Woodward 8250-226 EG10P p/n A8250-226
Woodward 8250-421 EG3P oil motor
Woodward 8250-501 actuator
Woodward 8250-570
Woodward 8250-807 TA-20 Actuator
Woodward 8250-818 Governor
Woodward 8256-021 EPG Actuator
Woodward 8270-092 EG-A Control Box
Woodward 8270-122 2301 Power Supply,p/n
Woodward 8270-201
Woodward 8270-741 MOTOR OPERATED POTENTIOMETER
Woodward 8270-758 2301 SIGNAL CONVERTER
Woodward 8270-768 2301 AMPLIFIER
Woodward 8271-147 Load Sensor
Woodward 8271-467 2301 Load Share and Speed Control
Woodward 8271-472 2301 Load Sharing&Speed Control
Woodward 8271-652 2301 Load Share and Speed Control
Woodward 8271-674 Power Supplies
Woodward 8271-872 Import/Export Control
Woodward 8272-385 SPM Synchronizer
Woodward 8272-394 Real Power Sensor
Woodward 8272-447 Motor Operated Pot
Woodward 8272-464
Woodward 8272-684
Woodward 8272-684
Woodward 8272-695 Real Power Sensor
Woodward 8272-720 Real Power Sensor
Woodward 8272-781A Real Power Sensor
Woodward 8273-041 ATLAS SC
Woodward 8273-276 377A7823P001,Atlas PC 2×4 Sc w/act,LV
Woodward 8280-071 Hydraulic Pump
Woodward 8280-415 Digital Speed Control
Woodward 8280-505 723 Plus
Woodward 8290-195 Flo-Tech Speed Control
Woodward 8291-020 EHPC
Woodward 8301-633 MicroNet
Woodward 8405-020
Woodward 8406-113 EGCP-3 DIGITAL CONTROL
Woodward 8406-121 EGCP-2
Woodward 8434-246 Main Chassises w/LED&P.B
Woodward 8512-135
Woodward 8516-038
Woodward 8516-039 TG 13
Woodward 8516-042 4000 RPM CCW
Woodward 8516-051 TG-13E,4000 RPM,CCW MS CONN
Woodward 8516-068 TG-13E Actuator,Pressure Drive
Woodward 8516-076 TG-13A
Woodward 8570-412 PG Dial Governor,p/n C8570-412
Woodward 8575-241
Woodward 8575-377
Woodward 8580-064 Tachometer CIT Sensor
Woodward 8580-069 On Engine Gearbox Hydraulic Pump for Metering Valves
Woodward 8580-071 Engine Gearbox Hydraulic Pump
Woodward 8580-085 Engine Gearbox Hydraulic Pump
Woodward 8580-086 Hydraulic Pump
Woodward 8900-067 Sensor
Woodward 8901-457 CPC
Woodward 8901-881 Fuel/Water Valve
Woodward 8904-289 Valve
Woodward 8904-484 Gas Shutoff Valve with Suppression
Woodward 8904-773 Control 8904-881,9902-002
Woodward 8915-004 1907 Liquid valve with TM-55 Actuator
Woodward 8915-005 3103 Gas Valve with TM-55 Actuator
Woodward 8915-011 Control Valve-TM55P/3103 Low Temp Gas Fuel
Woodward 8915-024 Liquid Fuel Valve
Woodward 8915-046 Control Valve-TM55P/1907 Liq
Woodward 8915-075 Control Valve-TM40LP/3151A Water
Woodward 8915-094 Control Valve-TM55P/3103 High Temp Gas Fuel
Woodward 8915-103 Control Valve-TM40/Liquid LP
Woodward 8915-111
Woodward 8915-1146 3103/EM35 GAS VALVE