1756-ESMCAPXT+++1756-ESMCAPXT
串口初始化
串口按照Fx系列PLC的標(biāo)準(zhǔn)通信參數(shù)進(jìn)行配置:①波特率為9 600 bit/s;②數(shù)據(jù)比特為7位;③奇偶校驗(yàn)方式采用偶校驗(yàn);④停止位為1位。
3.2 請求通信
開始通信時,PC機(jī)發(fā)送"ENQ"指令查詢PLC是否準(zhǔn)備好,同時也檢查PC機(jī)到PLC的連接是否正確。當(dāng)接收到字符后,若PLC處在RUN狀態(tài),則要等到本次掃描周期結(jié)束時才應(yīng)答;若PLC處在STOP狀態(tài),則馬上應(yīng)答。通信正常時,PLC應(yīng)答"ACK";通信出錯時,應(yīng)答"NAK"。
【公 司】: 廈門泰尼電氣有限公司
【主 營】: AB、GE、施耐德等各類PLC產(chǎn)品
【價 格】: 電議
【發(fā)布人】: 張亮
【電 話】: 18030028083
【所在地】: 福建 - 廈門
【座 機(jī)】: 0592-6809819
【來 源】: 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
3.3 讀取PLC軟元件狀態(tài)
程序首先通過VISA寫入節(jié)點(diǎn)發(fā)送命令字符"0"讀取PLC相應(yīng)軟元件的狀態(tài),然后VISA讀取節(jié)點(diǎn)獲得PLC返回數(shù)據(jù)。寫入和讀取的字符串都是十六進(jìn)制形式的。通過對讀取的字符串的拆分可獲得相應(yīng)軟元件每一位的狀態(tài),從而起到監(jiān)視PLC的作用。
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