FANUC 01151-0041-0172 2.2 主控單元
主控單元是現(xiàn)場操控站的基地處理單元,首要承當本站的有些信號處理、操控運算、與上位機及其它單元的通訊等使命。它是一個高功用的工業(yè)級基地處理單元,選用模塊化構(gòu)造,主控單元可以熱備份辦法冗余運用。主控單元cpu 選用pentium ii芯片,主頻 233mhz以上;內(nèi)存為32m(db),2msram(帶掉電保護)。
2.3 輸入輸出單元
進程輸入輸出單元(i/o單元)是完結(jié)與現(xiàn)場信號的銜接、對輸入信號進行的收集與變換、對輸出信號進行限幅等處理的智能單元。模塊選用智能化方案和看門狗守時、多級阻隔、主動確診、輸出回饋以及體系毛病時輸出主動切換到安全情況等牢靠性辦法。
進程輸入輸出單元依據(jù)功用分為模入、模出、開入、開出和脈沖量處理、回路操控幾類。其間模入、模出單元可冗余裝備,以保證首要信號能得到牢靠處理。
單元選用模塊化構(gòu)造,通常由模塊主體和底座兩有些構(gòu)成。模塊主體由外殼和內(nèi)部模板構(gòu)成,通常有兩塊板,一塊為cpu板,另一塊為i/o處理板。 底座為無源底板,起銜接信號、固定模塊主體、并為模塊主體供電等效果。
3、硬件體系功用剖析
3.1 基地處理單元負荷
對現(xiàn)場操控站cpu和操作員站的cpu負荷率通常選用實測成果,選用這種體系構(gòu)造可以保證在滿裝備的繁忙工況下的現(xiàn)場操控站負荷率低于60%,操作站負荷率低于40%。
3.2 電源負荷剖析
每個進程i/o模塊選用了低功耗方案技能(如盡量選用低功耗的cmos集成電路、低電壓供電等),使每個現(xiàn)場操控站機柜在滿裝備的情況下,總的電源耗費不逾越50%。每個i/o模塊的額外輸入功率小于2w。在滿裝備時,機柜容量為50個i/o模塊,總電源功耗為200w(=2w×50個i/o模塊+50 w×2個冗余主控模塊),電源模塊的輸出功率為450w,電源的負荷為44.4%(=200 w/450w)。本核算是關(guān)于單電源模塊時i/o站機柜滿裝備的核算成果。
3.3 內(nèi)存和外存余量剖析
本體系現(xiàn)場操控站配34m內(nèi)存,實習占用2.5mb,余量為92.6%;現(xiàn)場操控站不需要外存;操作員站內(nèi)存和外存余量大于50%;效勞器內(nèi)存為256mb,實習運用8~16mb,余量大于93%;外存通常配20g硬盤,實習運用小于1g,余量大于90%。
3.4 網(wǎng)絡(luò)負荷剖析
(1) 操控網(wǎng)絡(luò)負荷剖析。操控網(wǎng)絡(luò)選用profibus-dp協(xié)議,prof ibus-dp選用輪巡的傳輸協(xié)議,假定一個體系有n個dp設(shè)備,通訊時體系主站首要對#1從站(#1dp設(shè)備)宣告一個懇求,#1從站依據(jù)懇求回來數(shù)據(jù),接著主站對#2從站宣告一個懇求,#2從站依據(jù)懇求回來數(shù)據(jù)……,主站對#n從站宣告一個懇求,#n從站依據(jù)懇求回來數(shù)據(jù),主站對#1從站(#1dp設(shè)備)宣告一個懇求,#1從站依據(jù)懇求回來數(shù)據(jù)……。體系一向不斷的輪巡悉數(shù)設(shè)備。
咱們思考體系輪巡一遍設(shè)備所用的時刻,體系可裝備成八種通訊速率,咱們依照1.5mbps進行剖析:
每秒鐘通訊字節(jié)數(shù)1500000÷8=187500 byte字節(jié)
按現(xiàn)場操控站的運用軟件通訊協(xié)議,查詢幀為4個byte,模仿量模件、脈沖量模件的幀為20(頭3位,數(shù)據(jù)16位,crc校驗1位)byte,開關(guān)量模件的幀為6(頭3位,數(shù)據(jù)2位,crc校驗1位)byte,而每個現(xiàn)場操控站的dp主卡的雙口ram包含輸入3584 byte、輸出3584byte,每個現(xiàn)場操控站理論上可以帶125個dp模塊,主站與從站的握手協(xié)議包含確診不大于20 byte。
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