qassim93
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Posts posted by qassim93
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Hi,
Many thanks for your reply Joe
The PLC model I'm using is "Unitronics SM43-J-RA22". I will answer the questions you listed and we need to know their answers:
- the range of the pressure sensor is from 2 - 30 Psi(abs). Its sensitivity is 3mV/psi. Full scale span is 90mV.
- The analog input of this PLC 14bit (16384units). Its Input is set to 0-10v.
- The analog output is 12bit - from 0-10v.
- The relationship between the pressure sensor reading and the output that will drive the pressure regulator is pretty simple: the pressure reading will be from -0.5Bar to 0Bar. and the pressure regulator should start at 3Bar @ (-0.5Bar sensor reading) and ends at 0Bar @ (0Bar sensor reading).
I used "Linearization" block to create the relationship between the pressure sensor input and pressure regulator driving output - as shown in the figures below.
BR,
Qassim
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Hi,
Many thanks for the reply @Ausman & @Joe_Tauser.
I spoke to the guy responsible for the project and it turned out that he was mistaken.
There is no set point required by the user. The functions looks like a simple linearization.
The pressure read by the pressure sensor will directly drive the pressure regulator with a given formula.
Currently I'm trying to create this simple program. But since I don't have any experience in using this program, I think it will take me some time to learn it.
Many thanks,
Qassim
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Greetings,
I'm new to this form and to Unitronics PLCs and I would like to ask for some help/
I previously programmed "allen bradley" PLCs using a software called "RSLogics". The were 4 programming languages that I can use to build the PLC program. However, VisiLogic doesn't have "Structure text" language. I already have done the analog conversion using formulas and created the HMI, but I'm stuck now
The program that I am trying to make is simply as follows:
- A number is written using the HMI and stored in a variable.
- This number is then compared to analog reading of the pressure sensor.
- If the numbers were different, then one analog output will be changed to reflect the number entered using the HMI - which will control a pressure regulator.
Could anyone please help me with this issue ?
Many thanks,
Qassim
Creating ON/OFF controller with analog IN/OUT using VisiLogic
in Vision & Samba PLC + HMI Controllers & VisiLogic Software
Posted
Thanks for your reply @Ausman
I removed the linearization block - because I cannot use float and created a formula instead.
The attached image shows the way I did it.
I will test the thing and post an update about it.
BR