ED1310c
ED1310c
ED1310c
PLC及其網(wǎng)絡(luò)發(fā)展到現(xiàn)在，已經(jīng)能夠?qū)崿F(xiàn)NBS或ISO模型要求的大部分功能，至少可以實(shí)現(xiàn)4級(jí)以下NBS模型或ISO模型功能。
PLC要提供金字塔功能或者說要實(shí)現(xiàn)NBS或ISO模型要求的功能，采用單層子網(wǎng)顯然是不行的。因?yàn)椴煌瑢铀鶎?shí)現(xiàn)的功能不同，所承擔(dān)的任務(wù)的性質(zhì)不同，導(dǎo)致它們對(duì)通信的要求也就不一樣。在上層所傳送的主要是些生產(chǎn)管理信息，通信報(bào)文長(zhǎng)，每次傳輸?shù)男畔⒘看?，要求通信的范圍也比較廣，但對(duì)通信實(shí)時(shí)性的要求卻不高。而在底層傳送的主要是些過程數(shù)據(jù)及控制命令，報(bào)文不長(zhǎng)，每次通信量不大，通信距離也比較近，但對(duì)實(shí)時(shí)性及可靠性的要求卻比較高。中間層對(duì)通信的要求正好居于兩者之間。
公司 名稱：廈門泰尼電氣有限公司
固定 電話：0592-6809819
聯(lián) 系 人：張亮
傳 真：0592-6890859【請(qǐng)備注“張亮”收】
商 務(wù) Q Q： 2314094943
手 機(jī)：18030028083
18020729220
Q Q 郵 箱：2314094943@qq.com
需要可以聯(lián)系絕對(duì)給你滿意的價(jià)格
公司地址：廈門市海滄區(qū)海滄街道濱湖一里7號(hào)2008室
由于各層對(duì)通信的要求相差甚遠(yuǎn)，如果采用單級(jí)子網(wǎng)，只配置一種通信協(xié)議，勢(shì)必顧此失彼，無法滿足所有各層對(duì)通信的要求。只有采用多級(jí)通信子網(wǎng)，構(gòu)成復(fù)合型拓?fù)浣Y(jié)構(gòu)，在不同級(jí)別的子網(wǎng)中配置不同的通信協(xié)議，才能滿足各層對(duì)通信的不同要求。
PLC網(wǎng)絡(luò)的分級(jí)與生產(chǎn)金字塔的分層不是—一對(duì)應(yīng)的關(guān)系，相鄰幾層的功能，若對(duì)通信要求相近，則可合并，由一級(jí)子網(wǎng)去實(shí)現(xiàn)。采用多級(jí)復(fù)合結(jié)構(gòu)不僅使通信具有適應(yīng)性，而且具有良好的可擴(kuò)展性，用戶可以根據(jù)投資情況及生產(chǎn)的發(fā)展，從單臺(tái)PLC到網(wǎng)絡(luò)、從底層向高層逐步擴(kuò)展。下面列舉幾個(gè)有代表性公司的PLC網(wǎng)絡(luò)結(jié)構(gòu)。
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