KJ1501X1-BC1

描述

中断并不是只有一个，有时会同时存在几个中断，中断具有优先的级别，他们会根据人的要求去执行更别的中断。这种中断中的中断也就形成了中断嵌套。当然中断的级别根据各种PLC内部的资源有关，同时也跟堆栈的容量大小也有关系。

中断的内容有很多种，比如外部中断、通信中的发送和接受中断、定时和计数的时钟中断、还有WDT复位中断等，它们丰富了在处理各种事务时响应种类。这样讲也许你并不能完全理解中断的内部结构和操作顺序，我们做一个小小的例子来说明.

每一个设备总是不会忘记有一个按钮，它也是在我们遇到紧急情况时使用的，那就是急停按钮。当我们遇到人身事故和意外情况时我们只要按下它，机器立即停止所有的操作，并等待处理完意外后再恢复操作。急停按钮连接PLC内部的内部I/O接口上，当按钮给一个外部触发信号时，对I/O进行再次检测，当确认有外部触发信号时，保护现场并将程序计数器自动转到相应的外部I/O中断程序中去，当外部中断程序处理完毕，程序计数器返回到主程序继续工作。有一点可以说明的是我们一般会把急停按钮的外部中断升至别，从而保证安全。

TEKTRONIX VM700A VIDEO MEASUREMENT SET

Tektronix TDS754D 500MHz Oscilloscope TDS 754D
Excellent condition, read description!

Tektronix TDS2024 Four Channels Digital Storage Scope

Tektronix TDS644B Digital Oscilloscope 500Mhz, 2Gs/s

CDS / Tektronix 73A-455 MIL-STD-1553A/B Bus Simulator

Tektronix TDS540C Digital Oscilloscope, 500MHz, 2GS/s

Tektronix TG2000 w/ AGL1 – BG1 – DVG1 Video Generator

(1) Tektronix TFP2 Fibermaster with (2) FL1315 Modules

Tektronix CSA 803C Communications Signal Analyzer
Expedited shipping available

Tektronix VM 700A Video Measurement Set

Tektronix OM1420 Clock Recovery Module for OI2125 *NIB*
Expedited shipping available

Tektronix TLA711 Logic Analyzer TLA7D1 & Monitor

Tektronix VX4730 12CH VXI DAC Digital Analog Converter

Tektronix TDS-754 4Ch 500Mhz 2G/S DPO Oscilloscope Opt

TEKTRONIX Logic Analyzer 68 Channel TLA612+ 4 Probes

Tektronix VM700 Video Test Set w/ opt’s 01 (Reduced!)

Tektronix 1502B TDR w/opt’s

TEKTRONIX DG2020 Data Pattern Generator + OPT 01 / 24ch

Tektronix THS 730A THS730A “TekScope,” NIST-calibrated
additional free NIST recalibration within one year

Tektronix 1765 Analog Video Waveform / Vector Monitors

Tektronix 2467B 400 MHz 4-channel scope, NIST-certified
additional free NIST recalibration within one year

TEKTRONIX TDS540C 4CH OSCILLOSCOPE 2GS/sec 500 MHz DPO

Tektronix TDS684B 4CH 1GHz Digital Oscilloscope
13, 1F, 2F, 30 day full warranty, pdf manual

Tektronix TDS520C 500 MHz Oscilloscope – CALIBRATED!
Unit Tested & Guaranteed w/ ROR! Options 1F, 1M & 2F!!

Tek TLS216 16CH DSO DIGITAL OSCILLOSCOPE 2GS/s 500MHz

Nice Tektronix TDS 754A 1M InstaVu HP Oscilloscope

Tektronix SJ300E/03/3C Sonet/SDH Jitter Wander Analyzer
Good working unit, 14-day right of return

Tektronix 2754P Spectrum Analyzer: 10k – 21GHz, Opt. 01
One-day shipping available

Tektronix OTS91C1 10GB CLOCK/TRIGGER CARD

TEKTRONIX 1765

TEKTRONIX TDS744A 4 CHANNEL 500 MHZ OSCILLOSCOPE

TEKTRONIX AWG2040 ARBITRAY WAVEFORM GENERATOR

Tektronix TDS3014 Oscilloscope no accessories

Tektronix VX4357 SPDT Relay Switching VXI Module

Tektronix TDS540C 500 MHz Digital Oscilloscope
One-day shipping available

Tektronix 492A Tek Spectrum Analyzer w/75 Ohm *Works*

Tektronix TDS 744A Color 500 Mhz Oscope 13, 1F & 2F

Tektronix DG2020 Data Generator with Option 02
One-day shipping available

NEW Tektronix VITS 200 Test Signal Generator Inserter
One-day shipping available

TEKTRONIX 80C01-CR 20 GHZ MODULE CSA8000 CSA8000B

Tektronix TDS540C Oscilloscope 500 MHz, 4 Ch., 1 GS/s
NIST calibration/30​-day warranty/14-da​y right of return

TEKTRONIX P7350SMA 5 GHz SMA input differential probe

Tektronix TDS644A Digitizing Oscilloscope

Tektronix VX4286 32-Channel Analog/Digital Input Module

Tektronix TDS3012B Ocilloscope 100MHz

TEKTRONIX TDS744A DIGITAL OSCILLOSCOPE OPT 13 1F 1M 2F

Tektronix TDS644A Color 4-Ch Oscilloscope 500MHz

Tektronix TAP1500 1.5 GHz Active Probe TESTED 2*PCS

Tektronix 1502B TDR Cable Tester & Campbell SDM1502

Tektronix 492P Tek Spectrum Analyzer Opt 123 GPIB Works

Tektronix DG2030 Data Pattern Generator
One-day shipping available

Tektronix AFG2020 Synthesized Arbitrary Function GEN

Tektronix AM 503B/503S/A6302 Current Probe Amplifier

Tektronix HFS9003 Pulse Generator w/ HFS9DG1 + HFS9DG2
HFS Programmable Stimulus Sytem & Data Time Generators