Categories
PLC PLC Basics PLC Learning Productivity 2000 Productivity Suite

Productivity 2000 PLC Ladder Logic Math

Math instructions perform mathematical calculations. The Productivity 2000 Series PLC has math instructions that you can use in various applications. We will look at the Data Statistics (DATA) and the Math Editor (MATH).
Productivity 2000 PLC Ladder Logic MathWe will demonstrate both of these instructions using the examples in the help file. An average wind speed will be calculated using the data instruction based on six different inputs. Converting Celsius to Fahrenheit degrees will be done with the math instruction for an oven temperature. The automation system that you implement may involve these instructions. You will require using these instructions in your commissioned programs as a system integrator.
Let’s get started with the Productivity 2000 Series PLC Math Instructions.

Previously in this Productivity 2000 series PLC, we have discussed:
P2000 Hardware FeaturesVideo
Productivity Suite Software InstallVideo
Communication (System Configuration)Video
First ProgramVideo
Debug ModeVideo
PLC Program DocumentationVideo
PLC CPU DisplayVideo
PLC Online ProgrammingVideo
PLC Tag DatabaseVideo
Ladder Logic ContactsVideo
Ladder Logic OutputsVideo
TimersVideo
CounterVideo

Data Statistics (DATA) Instruction – Productivity Math

This instruction is used to find a mathematical statistic for up to 16 tags or constants. We can select one of the following: Sum, Min, Max, Average, Median, or Standard Deviation.
Productivity 2000 PLC Ladder Logic MathThe instruction has an Input and Output section. This is where we input our tags. A radio button selection is at the bottom of the instruction to select what operation you would like to use.
Productivity 2000 PLC Ladder Logic MathDS1 to DS6 are placed in the input tags. If you do not know the tag reference, you can create a name for it. The Output tag will be called DS_Output.
Hit OK.
The tags used but not previously assigned will now be displayed. We will set DS1 to DS6 as memory retentive tags. (Memory is retained after a power interruption or switching from run to program mode.) We will assign numbers to our DS1 to DS6 tags. The tag database can also be used to assign numbers and memory retention.
Ladder Logic P2000 Sample ProgramSwitch1 will enable our first Data Statistics instruction. This will be used to sum (add) the numbers together. Copy and pasting are used to then copy the first rung three more times. Make the following changes:
Switch2 will find the minimum value of the tags DS2 to DS6.
Switch3 will find the maximum value of the tags DS2 to DS6.
Productivity 2000 PLC Ladder Logic MathOur application for the average wind speed will be calculated using switch 4.
Ladder Logic P2000 Sample ProgramSwitch4 will find the average value of the tags DS2 to DS6.
Each time the rung with the data statistics is copied, the switch number is changed, and the radio button at the bottom of the instruction is used to select the operation required.

Math Editor (MATH) Instruction – Productivity

The math editor will perform common math computations using tags and constants.
Productivity 2000 PLC Ladder Logic MathHere is a list of the operations that are available:
Arithmetic Operations: Add, Subtract, Multiply, Divide, Modulo, and Raise to a Power and Absolute Value.
Mathematical Instruction Functions Real Functions: Natural Log, PI, Square Root, Invert, Log Base 10
Mathematical Instruction Functions Trigonometric Functions: Sine, Cosine, Tangent, Arcsine, Arccosine, Arctangent
Mathematical Instruction Functions Radian Trigonometric Functions:
Mathematical Instruction Functions All of these functions are available to you through the math editor.
Our example will take a temperature reading in degrees Celsius (271) and convert this to degrees Fahrenheit. (520)
Productivity 2000 PLC Ladder Logic MathThe formula we will be using is CDegree * 1.8 + 32.
Productivity 2000 PLC Ladder Logic MathNote: The tag name is entered by selecting the Tag Entry Mode button or by selecting the tag name and hitting the Insert button.
Tag names are highlighted in red. Formula entries are in black. Order of operation is effective for the formula.
Ladder Logic P2000 Sample ProgramSwitch 5 will perform our math instruction and convert our temperature.

Watch the video below to see the math instructions used in our Productivity 2000 Series PLC.

Download the P2000 PLC math sample program here.

Productivity 2000 Series PLC from Automation Direct
Overview Link (Additional Information on the Unit)
Configuration (Configure and purchase a system – BOM)
User Manual and Inserts (Installation and Setup Guides)
Productivity Suite Overview (Features of the fully functional free software package for the Productivity Family of PLC (PAC) controllers)
Productivity Suite Programming Software (Free Download Link)
This software contains all the instructions and helps files for the Productivity Series.

Watch on YouTube: Productivity 2000 PLC Ladder Logic Math

If you have any questions or need further information, please contact me.
Thank you,
Garry


If you’re like most of my readers, you’re committed to learning about technology. Numbering systems used in PLCs are not challenging to learn and understand. We will walk through the numbering systems used in PLCs. This includes Bits, decimals, Hexadecimal, ASCII, and Floating points.

To get this free article, subscribe to my free email newsletter.


Use the information to inform other people how numbering systems work. Sign up now.

The ‘Robust Data Logging for Free’ eBook is also available for free download. The link is included when you subscribe to ACC Automation.

Leave a Reply

Your email address will not be published. Required fields are marked *