Some analysts plc analog output modules in

Is the A / D module, right, and his function is to 4-20MA current signal

into digital, his task is complete, as the data also needs to become a PLC

program processing, computing, or does not make sense. Because of the PLC

CPU unit can not directly accept a current or plc controller suppliers  voltage signal, a digital

signal only recognize him, that the data in the PLC in full is the

existence of a binary 0 or 1, and A / D module is a bridge, is responsible

for the conversion. However, after the conversion  Nanda micro smart plc procedures also need to

become data you need. That unit is to grab the CPU A / D in the data

module to process, after the program operation to get useful data, this

data may be temperature, weight, pressure, and finally displayed on the

touch screen, the touch screen has a generally driver, which has the PLC

channel, you make a connection can be a variable, since the touch screen

itself is also quite a drive axle, PLC where each state corresponds touch

point in the channel, where the variables corresponding to the  touch the

channel, an association can then collect the data. If you use a computer,

using VB, VC and other programming will all  Nanda cpu module plc develop their own drive this

one, and this thing may become significant. This is the point with the

touch screen is good, do not have to write this newsletter, directly on

the line.