橫河ARM15A-000端子板ARM15A-000接線端子板 重量2.2公斤
Relay Boards Detail Speci?cations
Mechanical Relay Boards (Contact Input)
Model | ARM15A |
Usage | Mechanical Relay Contact Input (Single / Dual-redundant) |
Contact Points | 32-point |
Terminals for Field Device Connection | M4 screws |
Modules | ADV151 (DI: 32-point) + ATD5A (Terminal block) ADV161 (DI: 64-point) (*1) |
Signal Cables | AKB331 (for 32-point) AKB337 (for 64-point) |
Contact Input Signal | ON signal: 150 Ω or less OFF signal: At least 200 kΩ |
External Contact Rating (Minimum Load) | 24 V DC, 13 mA (*3) |
Power Supply Voltage and Current Consumption of Internal Circuit (require external power supply) |
24 V DC Max. 0.32 A |
Power Supply for Field Device (require external power supply) | Dual-line (supply power per 16-point) 24 V DC: Max. 0.3 A per one line |
Insulation Resistance | At least 10 MΩ (500 V DC) |
Withstanding Voltage | Between ?eld device terminals and cases: 1.5 kV Between 24 V power terminals and cases: 500 V Between 24 V power terminals and ?eld device terminals: 1.5 kV |
Ambient Temperature and Humidity | 0 to 50 °C, 10 to 90 %RH |
Standards | EMC standards [CE Marking], [C-Tick Marking], [KC Marking] (*2) |
Size | W: 482.6 mm x H: 132.5 mm (3U) |
Weight | 2.2 kg |
*1: Two sets of relay board (ARM15A) and two sets of signal cable (AKB337) are required for one ADV161.
*2: ARM15A does not conform to Safety Standard [CSA].
*3: It is voltage/current that ARM15A applies to the external contact power supply.
DCS自動(dòng)化控制系統(tǒng)
DCS,即所謂的分布式控制系統(tǒng),或在有些資料中稱之為集散系統(tǒng),是相對(duì)于集中式控制系統(tǒng)而言的一種新型計(jì)算機(jī)控制系統(tǒng),它是在集中式控制系統(tǒng)的基礎(chǔ)上發(fā)展、演變而來的。在系統(tǒng)功能方面,DCS和集中式控制系統(tǒng)的區(qū)別不大,但在系統(tǒng)功能的實(shí)現(xiàn)方法上卻*不同。
首先,DCS的骨架——系統(tǒng)網(wǎng)絡(luò),它是DCS的基礎(chǔ)和核心。由于網(wǎng)絡(luò)對(duì)于DCS整個(gè)系統(tǒng)的實(shí)時(shí)性、可靠性和擴(kuò)充性,起著決定性的作用,因此各廠家都在這方面進(jìn)行了精心的設(shè)計(jì)。對(duì)于DCS的系統(tǒng)網(wǎng)絡(luò)來說,它必須滿足實(shí)時(shí)性的要求,即在確定的時(shí)間限度內(nèi)完成信息的傳送。這里所說的“確定”的時(shí)間限度,是指在無論何種情況下,信息傳送都能在這個(gè)時(shí)間限度內(nèi)完成,而這個(gè)時(shí)間限度則是根據(jù)被控制過程的實(shí)時(shí)性要求確定的。因此,衡量系統(tǒng)網(wǎng)絡(luò)性能的指標(biāo)并不是網(wǎng)絡(luò)的速率,即通常所說的每秒比特?cái)?shù)(bps),而是系統(tǒng)網(wǎng)絡(luò)的實(shí)時(shí)性,即能在多長(zhǎng)的時(shí)間內(nèi)確保所需信息的傳輸完成。系統(tǒng)網(wǎng)絡(luò)還必須非??煽?,無論在任何情況下,網(wǎng)絡(luò)通信都不能中斷,因此多數(shù)廠家的DCS均采用雙總線、環(huán)形或雙重星形的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)。為了滿足系統(tǒng)擴(kuò)充性的要求,系統(tǒng)網(wǎng)絡(luò)上可接入的zui大節(jié)點(diǎn)數(shù)量應(yīng)比實(shí)際使用的節(jié)點(diǎn)數(shù)量大若干倍。這樣,一方面可以隨時(shí)增加新的節(jié)點(diǎn),另一方面也可以使系統(tǒng)網(wǎng)絡(luò)運(yùn)行于較輕的通信負(fù)荷狀態(tài),以確保系統(tǒng)的實(shí)時(shí)性和可靠性。在系統(tǒng)實(shí)際運(yùn)行過程中,各個(gè)節(jié)點(diǎn)的上網(wǎng)和下網(wǎng)是隨時(shí)可能發(fā)生的,特別是操作員站,這樣,網(wǎng)絡(luò)重構(gòu)會(huì)經(jīng)常進(jìn)行,而這種操作不能影響系統(tǒng)的正常運(yùn)行,因此,系統(tǒng)網(wǎng)絡(luò)應(yīng)該具有很強(qiáng)在線網(wǎng)絡(luò)重構(gòu)功能。