With the development of PLC technology,its data storage area is getting bigger and bigger.Such as the PLC of Deweisen Company,its data storage area(DM area)can reach 9999 words.Such a huge data storage area can store a large amount of data.
Data acquisition can use a counter to accumulate and record the number of pulses collected,and periodically transfer it to the DM area.
Data acquisition can also use A/D unit.When the analog quantity is converted into a digital quantity,it will be transferred to the DM area regularly.
The PLC can also communicate with the computer,the data in the DM area is read out by the computer,and the data is processed by the computer.At this time,the PLC becomes the data terminal of the computer.
Electricity users have used PLC to record the user’s electricity consumption in real time,so as to realize the charging method of different electricity consumption time and different pricing,and encourage users to use more electricity when the electricity consumption is low,so as to achieve the purpose of reasonable electricity consumption and electricity saving.
随着PLC技术的发展,其数据存储区越来越大。如德维森公司的PLC,其数据存储区(DM区)可达到9999个字。这样庞大的数据存储区,可以存储大量数据。
数据采集可以用计数器,累计记录采集到的脉冲数,并定时地转存到DM区中去。
数据采集也可用A/D单元,当模拟量转换成数字量后,再定时地转存到DM区中去。
PLC也可与计算机通讯,由计算机把DM区的数据读出,并由计算机再对这些数据作处理。这时,PLC即成为计算机的数据终端。
电力用户曾使用PLC,用以实时记录用户用电情况,以实现不同用电时间、不同计价的收费办法,鼓励用户在用电低谷时多用电,达到合理用电与节约用电的目的。
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