描述

TURCK-BL20-16DI-24VDC-P

從時間調(diào)度上來說。
PLC的程序一般不能按事先設(shè)定的循環(huán)周期運行。PLC程序是從頭到尾執(zhí)行一次后又從頭開始執(zhí)行。（現(xiàn)在一些新型PLC有所改進，不過對任務(wù)周期的數(shù)量還是有限制）而DCS可以設(shè)定任務(wù)周期。比如，快速任務(wù)等。同樣是傳感器的采樣，壓力傳感器的變化時間很短，我們可以用200ms的任務(wù)周期采樣，而溫度傳感器的滯后時間很大，我們可以用2s的任務(wù)周期采樣。這樣，DCS可以合理的調(diào)度控制器的資源。
從網(wǎng)絡(luò)結(jié)構(gòu)發(fā)面來說。
一般來講，DCS慣常使用兩層網(wǎng)絡(luò)結(jié)構(gòu)，一層為過程級網(wǎng)絡(luò)，大部分DCS使用自己的總線協(xié)議，比如西門子和ABB的Profibus、ABB的CAN bus、施耐德的Modbus等，這些協(xié)議均建立在標準串口傳輸協(xié)議RS232或RS485協(xié)議的基礎(chǔ)上?，F(xiàn)場IO模塊，特別是模擬量的采樣數(shù)據(jù)（機器代碼，213/掃描周期）十分龐大，同時現(xiàn)場干擾因素較多，因此應(yīng)該采用數(shù)據(jù)吞吐量大、抗干擾能力強的網(wǎng)絡(luò)標準?；赗S485串口異步通訊方式的總線結(jié)構(gòu)，符合現(xiàn)場通訊的要求。
IO的采樣數(shù)據(jù)經(jīng)CPU轉(zhuǎn)換后變?yōu)檎螖?shù)據(jù)或?qū)嵭螖?shù)據(jù)，在操作級網(wǎng)絡(luò)（第二層網(wǎng)絡(luò)）上傳輸。因此操作級網(wǎng)絡(luò)可以采用數(shù)據(jù)吞吐量適中、傳輸速度快、連接方便的網(wǎng)絡(luò)標準，同時因操作級網(wǎng)絡(luò)一般布置在控制室內(nèi)，對抗干擾的要求相對較低。因此采用標準以太網(wǎng)是最佳選擇。TCP/IP協(xié)議是一種標準以太網(wǎng)協(xié)議，一般我們采用100Mbit/s的通訊速度。
PLC系統(tǒng)的工作任務(wù)相對簡單，因此需要傳輸?shù)臄?shù)據(jù)量一般不會太大，所以常見的PLC系統(tǒng)為一層網(wǎng)絡(luò)結(jié)構(gòu)。過程級網(wǎng)絡(luò)和操作級網(wǎng)絡(luò)要么合并在一起，要不過程級網(wǎng)絡(luò)簡化成模件之間的內(nèi)部連接。PLC不會或很少使用以太網(wǎng)。

產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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Pentium Motherboard Slot1 Soltek SL-67EV1 AGP PCI ISA

Truevision Targa PCI Card 0007-0074-20 0007-0043-10

FORCE 102803 VME PPC/POWERCORE-6?604E/16-200-L51?2-4

ARCNET ANET Compex A/Net-1 8-bit ISA PC/ XT/AT

Sigma MM120 Multimode 120 ISA Video Card ET4000

Intel AA 541287-205 Motherboard 5 ISA Socket5 430NX

Worlds Fastest 286 Motherboard 20MHz BabyAT AT M209 287

360K 400K Floppy Drive Sony OA-D31V-14 HH 3.5 in

Amstrad PCW8256 PCW Z80 CF2 CP104 Z70291 MC0031B 1985

Floppy Drive Sony MFD-17W-1N 9110 3.5in

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Motherboard Pentium ITOX CB60-V3 Socket370 /CPU/RAM/FAN

Transtech DSP TPMB2 PCI Card Multi-PMC Carrier/Tester

Tape Drive SCSI Wangtek 5525ES 525 525MB QIC 33777-024

Qbus DEC VAX PDP ClearPoint DCME-M30DAU/32 Memory Card

Amstrad PCW EME-232 CF-2 Floppy Drive PCW9512 Z80265

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SeaLevel ACB-530 4111 Rev.C ISA RS-530 RS-422/485 449

PIKA PIK8855 Daytona/16P8L ISA Card PIK-028-00234

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Tiara LANcard A15-00414-0000 ARCnet 8-bit ISA PC/ XT/AT

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90-0050-04/C 90-0071-10/D Newbridge Alcatel Control Crd

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486 Motherboard PCI ISA VLB 486-VIP-IO VIA Socket3 IDE

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486 Motherboard MiniEISA-486AS EISA DX4-100 32 MB 256K

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Motherboard Pentium Pine Technology ZA3 i440ZX TL-IZX3

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