74act125
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74ACT125DMQR中文资料
元器件交易网
54AC 74AC125 74ACT125QuadBufferwithTRI-STATEOutputs
March1993
54AC 74AC125 74ACT125
QuadBufferwithTRI-STATE Outputs
GeneralDescription
The’AC ’ACT125containsfourindependentnon-invertingbufferswithTRI-STATEoutputs
Features
YYY
ICCreducedby50%
Outputssource sink24mA
’ACT125hasTTL-compatibleoutputs
LogicSymbol
IEEE IEC
ConnectionDiagrams
PinAssignment
forDIP SOICandFlatpak
PinAssignment
forLCC
TL F 10692–1TL F 10692–2
TL F 10692–3
PinNamesn BnOn
DescriptionInputsOutputs
FunctionTableInputsAnLLH
BnLHX
OutputOnLHZ
HeHIGHVoltageLe
74ACT125DMQR中文资料
元器件交易网
54AC 74AC125 74ACT125QuadBufferwithTRI-STATEOutputs
March1993
54AC 74AC125 74ACT125
QuadBufferwithTRI-STATE Outputs
GeneralDescription
The’AC ’ACT125containsfourindependentnon-invertingbufferswithTRI-STATEoutputs
Features
YYY
ICCreducedby50%
Outputssource sink24mA
’ACT125hasTTL-compatibleoutputs
LogicSymbol
IEEE IEC
ConnectionDiagrams
PinAssignment
forDIP SOICandFlatpak
PinAssignment
forLCC
TL F 10692–1TL F 10692–2
TL F 10692–3
PinNamesn BnOn
DescriptionInputsOutputs
FunctionTableInputsAnLLH
BnLHX
OutputOnLHZ
HeHIGHVoltageLe
FB125,FC125详细解说
第5章S7-400H系统信息及诊断
在生产控制中,通常需要对S7-400H系统的信息和状态进行监控,例如监控CPU的主从状态、操作状态、DP从站与主站的通信状态等信息。在程序中可以通过对状态的判断进行必要的操作,也可以将系统信息上传到HMI,便于操作及维护人员监控。通过功能块可以将系统信息读出,下面介绍读取不同系统信息调用功能块的方法。 5.1利用SFC51(SSL-ID W#16#xy71)读出H系统信息
SSL-ID (SYSTEM STATUS LIST)系统状态目录,利用SFC51可以读出在SSL-ID指定的PLC系统信息,当SSL-ID 等于W#16#0071时,表示需要读出S7-400H系统当前的状态,可以在OB1或循环中断组织块OB3X中调用,调用SFC51的例子如图5-1所示:
图5-1 调用SFC51(SSL-ID W#16#0071)例子程序
SFC51的参数解释如下,
REQ :为1是读取SZL_ID指定的系统信息,本例中M1.1为1时启动读请求。 SZL_ID :指定需要读取的系统信息,本例为W#16#71,H系统当前状态。 INDEX
使用74LS74芯片
使用74LS74芯片,14号管脚接在_____________孔。 74LS74芯片的异步置位端
和异步复位端
接高电平时可
以悬空吗?
A:可以
对于74LS192,当选用加法计数时,时钟脉冲应接到哪个引脚对于74LS161,当计数功能选 预考核题目 试题1、
驱动74LS161的时钟动作沿是____________
A:时钟上升沿 B:时钟下降沿
C:上升和下降沿都有效 D:上升沿和下降沿随机
试题2、
试题3、
A:1) B:2) C:3)
对于74LS192,当选用减法计数时,时钟脉冲应接到哪个引脚?
试题4、
对于74LS192,当选用加法计数时,时钟脉冲应接到哪个引脚?
A:能 B:不能
A:1) B:2) C:3)
D:4)
试题5、对于74LS192,第14引脚CR接什么电平时,计数器清零?
A:低电平 B:高电平 C:任意电平
择控制端为___________,计数器处于计数状态? 预考核题目 试题1、
A:时钟上升沿 B:时钟下降沿 C:上升和下降沿都有效
D:上升沿和下降沿随机
你的答案:C 错 试题2、
love is an act of endless forgiveness
英语作文
Love is an act of endless forgiveness
Love is an important activity of human life,It is not just between lovers, also among family members、friends、colleagues an so on.There is a common rule that people who lives in the world is just for the variety of loves.However love is not only the romantic and sweet pictures but also contains fights and depressions.It is said that "It takes three seconds to say 'I love you', three hours to explain it , and a lifetime to prove it."
Beauty is in the eye of the beholde
ACT阅读长难句
ACT 阅读长难句
1.In days gone by, when the only entertainment in town on a Wednesday night was to go to the county courthouse to listen to a prominent politician give a theatrical tirade against Herbert Hoover, an eloquent speaker could pack the courthouse and have five thousand people lined up to the railroad tracks listening to the booming loudspeakers.
2. Try sometime to explain the intricacies of a program budget, which basically involves solving a grand equation composed of numerous simultaneous
differential functions, to a
使用74LS74芯片
使用74LS74芯片,14号管脚接在_____________孔。 74LS74芯片的异步置位端
和异步复位端
接高电平时可
以悬空吗?
A:可以
对于74LS192,当选用加法计数时,时钟脉冲应接到哪个引脚对于74LS161,当计数功能选 预考核题目 试题1、
驱动74LS161的时钟动作沿是____________
A:时钟上升沿 B:时钟下降沿
C:上升和下降沿都有效 D:上升沿和下降沿随机
试题2、
试题3、
A:1) B:2) C:3)
对于74LS192,当选用减法计数时,时钟脉冲应接到哪个引脚?
试题4、
对于74LS192,当选用加法计数时,时钟脉冲应接到哪个引脚?
A:能 B:不能
A:1) B:2) C:3)
D:4)
试题5、对于74LS192,第14引脚CR接什么电平时,计数器清零?
A:低电平 B:高电平 C:任意电平
择控制端为___________,计数器处于计数状态? 预考核题目 试题1、
A:时钟上升沿 B:时钟下降沿 C:上升和下降沿都有效
D:上升沿和下降沿随机
你的答案:C 错 试题2、
ACT阅读长难句
ACT 阅读长难句
1.In days gone by, when the only entertainment in town on a Wednesday night was to go to the county courthouse to listen to a prominent politician give a theatrical tirade against Herbert Hoover, an eloquent speaker could pack the courthouse and have five thousand people lined up to the railroad tracks listening to the booming loudspeakers.
2. Try sometime to explain the intricacies of a program budget, which basically involves solving a grand equation composed of numerous simultaneous
differential functions, to a
ACT考试策略技巧大全
Table of Contents
ACT TEST RESOURCES.......................................................................................................................4
READING...................................................................................................................................................5 STRATEGY 1: FLYING OVER THE PASSAGE............................................................................................5 STRATEGY 2: CREATING A TENTATIVE SUMMARY.................................................
Can management be trusted to act with integrity in
Can management be trusted to act with integrity in today’s
complex and variable business world?
Table of Contents
Introduction ........................................................................................... 3
Why do companies want to pursue honesty it ? ................................... 3
How companies can establish a culture of integrity ? .......................... 3
Cultural qualities of integrity of managers ........................................... 4
To contract -based integrity ...............................