IC693ALG223

PLC從傳統(tǒng)的繼電器回路發(fā)展而來，最初的PLC甚至沒有模擬量的處理能力，PLC從開始就強(qiáng)調(diào)的是邏輯運(yùn)算能力。隨著科技的發(fā)展，控制技術(shù)的突飛猛進(jìn)，PLC發(fā)展到今天，已經(jīng)全面移植到計(jì)算機(jī)系統(tǒng)控制上了，已經(jīng)具備了強(qiáng)大的模擬量處理能力。對于機(jī)組控制，前期由于PLC模擬量處理能力的局限，大部分模擬量參數(shù)的控制都采用開關(guān)，如壓力開關(guān)、液位開關(guān)等。這些開關(guān)大部分是機(jī)械式的，或者是通過設(shè)定器設(shè)定報警點(diǎn)，從而轉(zhuǎn)換成數(shù)字量。這樣往往控制精度相對較低，難免有誤動作。隨著PLC模擬量處理能力的強(qiáng)大，模擬量處理模塊的產(chǎn)生，可以把測量變送器的信號直接引入PLC處理模塊，在程序中寫入聯(lián)鎖動作點(diǎn)。大大的提高的控制精度，減少了誤動作。
PLC內(nèi)部資源極其豐富，內(nèi)部存儲器（軟繼電器）數(shù)量往往數(shù)以千數(shù)。PLC采用“軟器件”、“軟觸點(diǎn)”進(jìn)行聯(lián)鎖，它并不改變PLC外部電路的結(jié)構(gòu)，因而不存使電路復(fù)雜化的問題。而這種聯(lián)鎖本質(zhì)上是增加PLC運(yùn)算的條件，使得PLC在進(jìn)行輸出之前需要進(jìn)行更多的安全可靠性判斷，從而使系統(tǒng)的安全可靠性得到提高。通過系統(tǒng)保護(hù)程序的開發(fā)與運(yùn)行，使PLC能及時感知系統(tǒng)的故障或存在的事故隱患，并通過保護(hù)程序做出相應(yīng)的反應(yīng)，以防止事故發(fā)生或擴(kuò)大，更好的保護(hù)人身和設(shè)備的安全。
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ABB EH-110
Square S29387
Siemens B33500S01
GE ADS22030HD
SQD FHL3610016DC1684
WHCHMCP HMCP070M2C
SIEMENS 3TY7573-0CM7
Square EDB34100
GE SLSB5G
SQD QBP22070TM
SQD KAL261501700
SIEMENS QJH22B150
SQD S29390
Cutler FD3015L
SIEMENS QJ23B125
CUTLER ED3225L
Cutler FD3015
SQD MA11284
SQD KAL26125
CUTLER HMCPE050K2C
SIEMENS QJ23B225H
ABB EH-210 230A
ABB EH-210
Square HDF36060
SIEMENS J6N1
CUTLER 6-27-2 6272 SZ5
SQUARE EJB34030
ABB EH-175 180A 24V
ABB EH-145
SIEMENS 3TY7550-OA
SIEMENS 3TY7550-OA
SQUARE S29407
SQUARE QMB321TW
MERLIN CF250NA
SQUARE QGA222022
SQUARE FC34100
CUTLER 6-43-6 6436
SIEMENS S01JLD6
SQUARE S29384
Merlin MP12H1
ABB A210-30-11
GENERAL TJK436Y400
Square HDL36100
TELEMECANIQUE LC1F185
SQUARE KHL3622522DC
CUTLER HMCPE050K2C
SIEMENS QJ23B225H
Siemens 3TF5322
Cutler FD3050
SQUARE FCP340401253
CUTLER 6272 SZ5
SQUARE EJB34030
ABB EH-175
ABB A210-30-11
CUTLER DK3300W
General TFJ236200
CUTLER EGH3050FFG
CUTLER 5720B33G17
SQUARE KHL3622522DC
Westinghouse 2606D57G13
GE SL361R
SIEMENS HQ2150BH
AB 140U-J2D3-D15
GE SB362R
General AC362RG
SQUARE LAL36225?
IC693ALG223