詳細(xì)介紹
ABBSPASO11
ABBSPASO11
1. 條件跳轉(zhuǎn)指令CJ
2. 子程序調(diào)用指令CALL與返回指令SRET
3. 中斷返回指令I(lǐng)RET、允許中斷指令EI與禁止中斷指令DI
4. 主程序結(jié)束指令FEND
5. 監(jiān)視定時(shí)器刷新指令WDT
6. 循環(huán)開(kāi)始指令FOR與循環(huán)結(jié)束指令NEXT
1、條件跳轉(zhuǎn)指令CJ
CJ、CJP指令用于跳過(guò)順序程序某一部分的場(chǎng)合,以減少掃描時(shí)間。條件跳轉(zhuǎn)指令CJ應(yīng)用說(shuō)明如圖
2、子程序調(diào)用指令CALL與返回指令SRET
子程序應(yīng)寫(xiě)在主程序之后,即子程序的標(biāo)號(hào)應(yīng)寫(xiě)在指令FEND之后,且子程序必須以SRET指令結(jié)束
3、中斷返回指令IRET、允許中斷指令EI與禁止中斷指令DI
PLC一般處在禁止中斷狀態(tài)。指令EI~DI之間的程序段為允許中斷區(qū)間,而DI~EI之間為禁止中斷區(qū)間。當(dāng)程序執(zhí)行到允許中斷區(qū)間并且出現(xiàn)中斷請(qǐng)求信號(hào)時(shí),PLC停止執(zhí)行主程序,去執(zhí)行相應(yīng)的中斷子程序,遇到中斷返回指令IRET時(shí)返回?cái)帱c(diǎn)處繼續(xù)執(zhí)行主程序。
監(jiān)視定時(shí)器刷新指令WDT
如果掃描時(shí)間(從第0步到END或FEND)超過(guò)100ms,PLC將停止運(yùn)行。在這種情況之下,應(yīng)將WDT指令插到合適的程序步(掃描時(shí)間不超過(guò)100ms)中刷新監(jiān)視定時(shí)器。
6、循環(huán)開(kāi)始指令FOR與循環(huán)結(jié)束指令NEXT
FOR~NEXT之間的程序重復(fù)執(zhí)行n次(由操作數(shù))后再執(zhí)行NEXT指令后的程序。循環(huán)次數(shù)n的范圍為1~32767。若n的取值范圍為-32767~0,循環(huán)次數(shù)作1處理。
FOR與NEXT總是成對(duì)出現(xiàn),且應(yīng)FOR在前,NEXT在后。FOR~NEXT循環(huán)指令多可以嵌套5層。
利用CJ指令可以跳出FOR~NEXT循環(huán)體。
Aera FC-7810C
Aera FC-7810CD
Aera FC-7800CU
Aera FC-7700CD
VAT 17240-PE44-1010
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Leybold 400110V0017
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