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Monitor 重锤测料位6-8531-1122可直接查面价
更新时间:2021-02-05   点击次数:595次

 Monitor 重锤测料位6-8531-1122可直接查面价
MONITORAvailable since 1.0.0.
MONITOR is a debugging command that streams back every command processed by the Redis server. It can help in understanding what is happening to the database. This command can both be used via redis-cli and via telnet.

The ability to see all the requests processed by the server is useful in order to spot bugs in an application both when using Redis as a database and as a distributed caching system.

$ redis-cli monitor
1339518083.107412 [0 127.0.0.1:60866] "keys" "*"
1339518087.877697 [0 127.0.0.1:60866] "dbsize"
1339518090.420270 [0 127.0.0.1:60866] "set" "x" "6"
1339518096.506257 [0 127.0.0.1:60866] "get" "x"
1339518099.363765 [0 127.0.0.1:60866] "del" "x"
1339518100.544926 [0 127.0.0.1:60866] "get" "x"

Use SIGINT (Ctrl-C) to stop a MONITOR stream running via redis-cli.

$ telnet localhost 6379
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
MONITOR
+OK
+1339518083.107412 [0 127.0.0.1:60866] "keys" "*"
+1339518087.877697 [0 127.0.0.1:60866] "dbsize"
+1339518090.420270 [0 127.0.0.1:60866] "set" "x" "6"
+1339518096.506257 [0 127.0.0.1:60866] "get" "x"
+1339518099.363765 [0 127.0.0.1:60866] "del" "x"
+1339518100.544926 [0 127.0.0.1:60866] "get" "x"
QUIT
+OK
Connection closed by foreign host.

Manually issue the QUIT or RESET commands to stop a MONITOR stream running via telnet.
Commands not logged by MONITOR

Because of security concerns, all administrative commands are not logged by MONITOR's output.

Furthermore, the following commands are also not logged:

    AUTH
    EXEC
    HELLO
    QUIT

Cost of running MONITOR

Because MONITOR streams back all commands, its use comes at a cost. The following (totally unscientific) benchmark numbers illustrate what the cost of running MONITOR can be.

Benchmark result without MONITOR running:

$ src/redis-benchmark -c 10 -n 100000 -q
PING_INLINE: 101936.80 requests per second
PING_BULK: 102880.66 requests per second
SET: 95419.85 requests per second
GET: 104275.29 requests per second
INCR: 93283.58 requests per second

Benchmark result with MONITOR running (redis-cli monitor > /dev/null):

$ src/redis-benchmark -c 10 -n 100000 -q
PING_INLINE: 58479.53 requests per second
PING_BULK: 59136.61 requests per second
SET: 41823.50 requests per second
GET: 45330.91 requests per second
INCR: 41771.09 requests per second

In this particular case, running a single MONITOR client can reduce the throughput by more than 50%. Running more MONITOR clients will reduce throughput even more.
Return value

Non standard return value, just dumps the received commands in an infinite flow.
History

    >= 6.2: RESET can be called to exit monitor mode.
    >= 6.0: AUTH excluded from the command's output.

Related commands

   Monitor 重锤测料位6-8531-1122可直接查面价

安装在料仓顶部的料位计传感器的探测过程由控制显示仪表发出的信号控制。传感器由可逆电机、蜗轮、蜗杆、丝杠、齿轮轴、绕线筒、灵敏杠杆等组成。(见图2)

当传感器接到探测命令时:电机正转,经蜗轮、蜗杆减速后带动齿轮轴和绕线筒转动,使钢丝绳下放,带动重锤由仓顶下降。当重锤降至料面时被料面托起而失重,钢丝绳松驰,灵敏杠杆动作使

微动开关接触,控制显示器得到该信号立即发出电机反转命令,重锤上升返回,直到绕线筒碰上到顶开关,电机停转,重锤回到仓顶

原始位置,完成一次探测过程。

在此过程中控制显示仪表通过检测绕线筒的转数计算出重锤从仓底到料面间的距离,在面板进行数字显示,并在后面板端子上输出4~20mA电流。

重锤式料位计可用来测量粉状、颗粒状及块状固体物料料仓的料位,使用户可靠地掌握料仓中的料位。
 产品概述

重锤式料位计用于监测料斗、筒仓、储罐等容器内粉末、颗粒和液体高度或近似重量的实 时测量。它通过直接测量顶部无料空间距离,间接达到测量料层内物料高度的目的,并且可以根据不同的工况选择配置各种法兰、重锤及操作界面或远程通讯等,实 现了人性化、科学化、合理化的设计宗旨。其中QHYC-Ⅰ系列用于冶金行业的料位测量,QHLC-Ⅰ系列用于粮油加工业的料位测量。
工作原理

重锤式料位计的主要部件有:重锤、安装法兰、测量机构、吹灰装置、导向轮、钢丝绳、钢丝绳卷筒、摆杆机构、控制单元、电机、测控单元、计量单元和电气接口。

传 感器接到探测命令时,电机正转,经减速机构后带动绕线筒转动,钢缆下放,重锤跟随其下降,当重锤降至料面时被料面托起而失重,钢丝绳松驰,灵敏杠杆动作使 霍尔元件动作,并将位置信号传递给控制器,控制器得到该信号后立即发出电机反转命令,重锤随钢丝绳上升返回,直到重锤回到仓顶原始位置,电机停转,完成一 次探测过程。 并以4—20mA电流信号、标准的MODBUS串行通讯方式、干接点三种方式传输给DCS系统或外置显示单元料位及报警信号。 
 Monitor 重锤测料位6-8531-1122可直接查面价

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