PLC SCP Instruction - Scale With Parameters RSLogix 500 Example for Analog Inputs Programming

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PLC SCP Instruction - Scale With Parameters RSLogix 500 Example for Analog Inputs Outputs Programming
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The SCP, also known as the scale with parameters, is an instruction which is commonly used for working with analog signals. It's an instruction which can be utilized in ladder logic as well as function blocks. The instruction will take input, use input minimum & maximums parameters as well as outputs min/max parameters and convert the output scaling based on them.
The primary reason as to why you'd want to utilize this instruction is the fact that analog data will typically be meaningless as it comes into the Programmable Logic Controller or Input Card. The reason being is that the 4-20mA or 0 to 10 VDC signal is generally scaled to the largest scale. On an RSLogix 500 based PLC, this is typically 16384. Once the signal is captured, it's important to either scale it to a percentage of the full range or to a meaningful value. For example, A pressure sensor which reads 0-5 psi, will input 4-20mA & will convert to 0-16384. By using the SCP instruction, one can scale down this value into the psi which will be meaningful for the operator & other users of the system. Do note that the same can be done through the card, but it's usually more difficult to change, keep track of and be reapplied.
The mathematical equation of the SCP is straightforward. The equation applied is a linear transformation which maps each value based on the limits as if they were points on a cartesian plane. In fact, one can easily calculate the scaling on a sheet of paper to verify the validity of the scaling factor.
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Пікірлер: 17

@kevin00861 Жыл бұрын

Thanks a million times, I really thank you before I even start watching as I'm sure the content would be very useful

@patilprashanth1 5 жыл бұрын

thanks ...this video cleared all my questions i had about scaling....thanks again

@SolisPLC 5 жыл бұрын

Thank you for the feedback!

@macmagruder8922 4 жыл бұрын

Vlad, you rock

@RakeshPatel-cg9ku 4 жыл бұрын

Thank you sir,,,you described things very nice way..

@vinodjangir9189 4 жыл бұрын

Thanks..I understand how does work SCP Instruction.

@Ashishchabha 5 жыл бұрын

Is there any similar instruction to "SCP" in Siemens s7 200 smart plc?

@jonathonlock361 4 жыл бұрын

can you please explain how you use that parameter to trigger an output I understand it goes to the floating values but how do you then use this to trigger an output thanks

@sharaijaz 4 жыл бұрын

Can you please cover the Mitsubishi GXW2 software

@princing 5 жыл бұрын

Many thanks for video. Can one use an SCP function to act as a type of speed setting for a motor via an analogue in/out card? Can the SCP output to a destination so that a set voltage between 0 and 10, say 5volts into a VSD (AB PowerFlex 4). Appreciate your help. Thank you

@SolisPLC 5 жыл бұрын

Hi Charles, you can definitely do that. As an example, if your sensor reads 0-100psi, you could use the SCP to set the output to be scaled to 0-10v (in that case you'd probably use 0 to 16383 for an analog output). This would essentially translate to the motor running at a proportional speed to the reading from the sensor. However, a better way of doing this would be to combine the SCP with a PID instruction in order to add the integral and derivative parameters. With a pure sensor value, you can potentially see an issue where the motor is spiked high or low depending on the readings from the sensor. Hope that helps...

@princing 5 жыл бұрын

@@SolisPLC Thank you very much for that info I look forward to trying that out and I'll look into the PID instruction too. Super

@darpangiri4559 2 жыл бұрын

Which processor does SCP function is supported on

@ahmadalkasem5673 4 жыл бұрын

bro what if i have( 2) conditional analog inputs and i want to connect them to a digital output

@sharaijaz 4 жыл бұрын

nice video how to know, that float (F8) fro data files belongs to which input channel?

@SolisPLC 4 жыл бұрын

When you expand it, it should specify the card on the right side. Furthermore, when you go into your controller properties, your input cards should be mapped to a certain data file in which you will have the inputs.