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7.3.2 PLC 軟件系統(tǒng)設(shè)計(jì)的步驟
在了解了程序結(jié)構(gòu)和編程方法的基礎(chǔ)上，就要實(shí)際地編寫 PLC 程序了。編寫 PLC 程序和編寫其他計(jì)算機(jī)程序一
140XTS00209
140XTS00209
PLC執(zhí)行程序的過程分為三個(gè)階段，即輸入采樣階段、程序執(zhí)行階段、輸出刷新階段，PLC的掃描工作過程:
（1）輸入采樣階段。在這一階段中，PLC以掃描方式讀入所有輸入端子上的輸入信號(hào)，并將各輸入狀態(tài)存入對(duì)應(yīng)的輸入映像寄存器中。此時(shí)，輸入映像寄存器被刷斷。在程序執(zhí)行階段和輸出刷新階段中，輸入映像存儲(chǔ)器與外界隔離，其內(nèi)容保持不變，直至下一個(gè)掃描周期的輸入掃描階段，才被重新讀入的輸入信號(hào)刷新?？梢?，PLC在執(zhí)行程序和處理數(shù)據(jù)時(shí)，不直接使用現(xiàn)場(chǎng)當(dāng)時(shí)的輸入信號(hào)，而使用本次采樣時(shí)輸入到映像區(qū)中的數(shù)據(jù)。一般來(lái)說(shuō)，輸入信號(hào)的寬度要大于一個(gè)掃描周期，否則可能造成信號(hào)的丟失。
（2）程序執(zhí)行階段。在執(zhí)行用戶程序過程中，PLC按照梯形圖程序掃描原則，一般來(lái)說(shuō)，PLC按從左至右、從上到下的步驟逐個(gè)執(zhí)行程序。但遇到程序跳轉(zhuǎn)指令，則根據(jù)跳轉(zhuǎn)條件是否滿足來(lái)決定程序跳轉(zhuǎn)地址。程序執(zhí)行過程中，當(dāng)指令中涉及輸入、輸出狀態(tài)時(shí)，PLC就從輸入映像寄存器中“讀入”對(duì)應(yīng)輸入端子狀態(tài)，從輸出映像寄存器“讀入”對(duì)應(yīng)元件（“軟繼電器”）的當(dāng)前狀態(tài)。然后進(jìn)行相應(yīng)的運(yùn)算，運(yùn)算結(jié)果再存入輸出映像寄存器中。對(duì)輸出映像寄存器來(lái)說(shuō)，每一個(gè)元件（“軟繼電器”）的狀態(tài)會(huì)隨著程序執(zhí)行過程而變化
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UFM FLOW MONITOR TYPE 12-13 WVM50GM-10-A1NR
ROSEMOUNT ALPHALINE TRANSMITTER 1151GP9E12B2E6
SPECTRONICS 624/MXADM NSFP 624MXADM
EG&G EC Electrochemical Detector Model 400 Rev
DANIEL INDUSTRIES 3-2251-007 NSPP 32251007
SUN 501-4882-10 CPU Memory Board w/ MT18LDT1672FSG-6
INGERSOLL RAND GRINDER 88V60P107 7" 6000 RPM
Rees 04925-229 Heavy Duty Selector Switch 04925229
HP Designjet Z3100 24-in Printer PCA Q5669-60245
6 1/2" LYNDEX 100-032 COLLET
BioAnalytical Systems BAS RYT-DP Chart Recorder
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Sun Enterprise 501-3113 Wide SCSI W/ 2 DNES-309170
Proto 3 1/4" x 1 1/2 Impact Drive Socket 1.5
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Proto 3 11/16" x 1 1/2 15059 Impact Drive Socket 1.5
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General Radio 1433-K Decade Resistor 1433K
OMEGA FP85A SIGNAL CONDITIONERS FLOW SENSORS
GENUINE 6310245-45 Compaq 110 220GB Hot Swap SDLT LVD
Brad Harrison 301000C11F500
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Compaq 225289-001 Sps-bd Remote Insight Rd YOU GET 7
Compaq 70-40145-01 194599-001 Hot-Swap FC Emu 60HZ
3 Allen-Bradley Photoswitch 42GRL-9002-QD
Hastings 5331 Elbow Connector Tool for Hotsticks & shot
