PLC的快速信號(hào)在慢速反應(yīng)的DCS的操作站上顯示。經(jīng)測(cè)定,一個(gè)微動(dòng)開關(guān)的動(dòng)作要經(jīng)過幾秒以上的時(shí)間才能在DCS的操作站上表現(xiàn)出來。有的DCS甚至需要8秒。另一個(gè)互聯(lián)辦法是把PLC的個(gè)別信號(hào)用硬線連到DCS的輸入板上,這樣輸入的點(diǎn)數(shù)很少,成本比較高。有的DCS在DCS網(wǎng)絡(luò)上設(shè)計(jì)一個(gè)結(jié)點(diǎn),該結(jié)點(diǎn)專門用來讀取PLC的信號(hào)。把PLC的信號(hào)送入DCS的網(wǎng)絡(luò)是比較困難的。缺點(diǎn)是開發(fā)接口的費(fèi)用很高。即使開發(fā)成功,接口也經(jīng)常發(fā)生故障。
Square D QMB Branch Switch 200 Amp QMB324W Fusible 240V
Honeywell ISSC 621-1101 Isolated Input Module 6211101
CH/Westinghouse HJD3250F 250 Breaker w/JT3200T 200A Trip HJD3200 Cutler Hammer
Cutler Hammer WH HJD HJD3250F JT3200T HJD3200 200 A Amp
Westinghouse HMCP HMCP250W5W 250 A 250Amp Amp 250A
Westinghouse Panelboard Switch FDPS364 200 Amp A FDP
CH/Westinghouse HJD3250F 250A Breaker w/JT3200T 200A Trip HJD3200 200 Amp Cutler
ABB 437W7790 Type 32R Circuit Shield Reverse Power Relay Range 22-260 W 24 VDC
Siemens 6SN1114-0NB01-0?AA1 611U Option-Profibus DP3 NIB
Bussmann JCL-2R 70A Fuse JCL2R 5.08kV R-rated Buss NIB
Bently Nevada XDCR I/O & Record Terminals 81545-01 Alarm Relay Outputs 78462-01
Bently Nevada 3 Wire RTD Input Channel 82368-01 79532-01 PWA79532-01 F