描述

延時程序最大延時時間受計數(shù)器的最大計數(shù)值和時鐘脈沖的周期限制，如圖5-11所示計數(shù)器C0的最大計數(shù)值為32767，所以最大延時時間為：32767×0.1＝3276.7s。要增大延時時間，可以增大時鐘脈沖的周期，但這又使定時精度下降。為獲得更長時間的延時，同時又能保證定時精度，可采用兩級或多級計數(shù)器串級計數(shù)。如圖5-12所示為采用兩級計數(shù)器串級計數(shù)延時的一個例子。圖中由C0構(gòu)成一個1800s（30min）的定時器，其常開觸點每隔30min閉合一個掃描周期。這是因為C0的復(fù)位輸入端并聯(lián)了一個C0常開觸點，當(dāng)C0累計到18000個脈沖時，計數(shù)器C0動作，C0常開觸點閉合，C0復(fù)位，C0計數(shù)器動作一個掃描周期后又開始計數(shù)，使C0輸出一個周期為30min、脈寬為一個掃描周期的時鐘脈沖。C0的另一個常開觸點作為C1的計數(shù)輸入，當(dāng)C0常開觸點接通一次，C1輸入一個計數(shù)脈沖，當(dāng)C1計數(shù)脈沖累計到10個時，計數(shù)器C1動作，C1常開觸點閉合，使Y5線圈接通，Y5觸點動作。從X15閉合，到Y(jié)5動作，其延時時間為18000×0.1×10＝18000s（5h）。計數(shù)器C0和C1串級后，最大的延時時間可達：32767×0.1×32767s＝29824.34h＝1242.68天。

歐美品牌停產(chǎn)的，常用的“PLC”備品備件

我司產(chǎn)品應(yīng)用于以下領(lǐng)域：

1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》

2,《智能平鋼化爐系統(tǒng)制造》

3,《PLC可編程輸送控制系統(tǒng)》

4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》

6,《化工廠藥液恒流量計算機控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列

本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

DIGIBOARD DIGICHANNEL BOX DUAL IMAC+POWER SUPPLY

IMC NETWORKS IMCV-FIBERLINX TX/FX SM1310 56-14516

Vsecure Technologies NetProtect LG100 Enterprise

ECI TELECOM BROADGATE nNT-E ROUTER 4x E1 PORTS NEW

BLACK BOX LE2101A-BT-R2 SINGLE PORT TERMINAL SERVER

IMC NETWORKS IMEDIACHASSIS SNMP MODULE 50-39950

IMC NETWORKS MEDIA CHASSIS 1-AC 1 SLOT 50-13100

IMC NETWORKS IMCV-GIGA-FIBER TX/LX-SM1310-SC 56-14870

NORTEL 8691SF DS1404090 PASSPORT MODULE 8006 SWITCH

AVAYA 700397110 MM316 40 POE HDMM

ADVA Optical Channel Multiplexing AD-SWM-DUP-4-S-?ST/ST

DATA SWITCH 9045 9045-15LL2DST

MAGNETEK SLI-48-230 SLI INVERTER 48V SL48-230

MCDATA SPHEREON 4500 FABRIC SWITCH

Sun ST914602SSUN 146G 540-7152-01 146GB 10k 540-7152

MATSUSHITA LF-D311SC 4.7GB IDE DVD RAM DRIVE

MATSUSHITA LF-D211V IDE 4.7/9.4GB REWRITABLE DVD-RAM

Western Digital WDAL2540 540MB Laptop Hard Drive

HP OMNIBOOK XE3 13.3″LAPTOP LCD DISPLAY LG LP133X7

MEMORY FOR LAPTOP 512MB SYNC 133MHZ CL3

MS340-EA 1GB(4X256MB DIMMS)43-096-0010 DS20 MS340EA

Lot of 576 STMicroelectron?ics M29W800DB70N6 Flash 8mb

Lot of 480 AMD AM29LV800DB-90EI Flash Memory 8MB

Lot of 120 Motorola MC68EN360CEM25K Electronic Componen

LOT OF 4 SUN MEMORY 370-6208-01 1GX4 370 6208

Sun Netra T2000 System Fan Assembly P/N 371-2736

LOT OF 4 HYNIX PC2100R-25330 2GB DDR 266MHz CL2.5 ECC

MICRON 1GB SYNCH 100MHZ CL2 ECC MEMORY MODULE

DATACUBE MAX VIDEO 20 260-0599 VME BOARD 080-0599-03

Performance Technologies PT-SBS 915 Board

SBE VCOM-33 REV A4 9016-36

ZNYX ZX4500P COMPACT PCI Dual 1000sx Manage Switch

MOTOROLA MVME162-032 01-W3884B W/LAN PORTS ADD ON BORD

MOTOROLA COMPACT PCI CPV5370 BOARD 01-W3545F

MOTOROLA COMPACT PCI CPTM-04 BOARD 01-W3764F

TOKIO ELECTRON TEL TEB102-1 NASS MVME BOARD

BIORAD MICRO MEASURMENTS Y5304901 VME BOARD

COMPUTER RECOGNITION SYSTEMS VME BOARD 8815CX528

COMPUTER RECOGNITION SYSTEMS 8843CC413 EDGE DETECTOR

COMPUTER RECOGNITION SYSTEMS VME BOARD 8937-0000

COMPUTER RECOGNITION SYSTEMS LCS BOARD 1520-1000

COMPUTER RECOGNITION SYSTEMS VME BOARD 8805DP862

COMPUTER RECOGNITION SYSTEMS VIDIO BOARD 10779

BIORAD RATS INTERFACE VME BOARD Y5304803

BIORAD AIMS CD SERVO VME BOARD Y5301267

PME SIO-1 VME BOARD

COMPUTER RECOGNITION SYSTEMS VME OVERLAY 8946-0001

RASTER GRAPHICS INC.6000700-09A VME BOARD

TOKIO ELECTRON TEL TVB0008-1 VMIF VME BOARD

BALDOR ASR BTS10-7.5/15-24-RL-736 28102D 27431D-002

BALDOR ASR BTS10-2.5/8-24-RL-735 27981D 27426D-002

BALDOR ASR BTS10-1/2-24-RL-734 27930D 28101C-002

ADEPT TECH 030-IDE 10332-11150 VME BOARD WARRENTY

Applied Materials Digital I/O Board 0100-20003

MOTOROLA MVME 197LE MAINFRAME BOARD

MOTOROLA MVME MODULE 01-W3347F-43A 147-022

VMI VMIVME 7487A MAINFRAME BOARD

DESCHUTES CORPORATION SG100 670-0030-00 MAINFRAME BOARD

DESCHUTES CORPORATION OCTUPOLE DRIVER 670-0100-01

ASML/SVG DUAL CHANNEL AQUISITION VME BOARD 865-8010-005

ASML/SVG DUAL CHANNEL AQUISITION VME BOARD 865-8023-004

ACB VME BOARD D23123300

ASML/SVG PC Board P/N:865-8022-00?4

Motorola 01-W3632F-12A cPCI BOARD 01-W3632F

Motorola 01-W3658F-06B cPCI BOARD 01-W3658F W/0181F-02A

RADVISION asNT-10 MODULE W/WIN SERVER 2000

MOTOROLA MVME2302 01-W3345F MVME 2302 NEW

COMPACT PCI 100P172820 120P243641 BLADE NEW

Motorola CPN5365 01-W3658F-06J cPCI BOARD 01-W3632F

Siemens S42024-C3016-A1 MAINFRAME BOARD

MIZAR 7710 VIDEO Board 7710-00011-01 REV-W

MOTOROLA COMPACT PCI CPV5370 BOARD 01-W3545F NTAR02NV

MOTOROLA CPTM-04 01-W3764F 01B NORTEL NTAR02NX

MOTOROLA 01-W3739F NORTEL NTAR02JY

SBE VCOM-33 VME CONTROLLER MODULE

METACOMP VMEcomm20 VME MODULE