CTT Counter Timer Tachometer – Getting Started

Digital Counter / Timer / Tachometer (CTT Series)
The CTT series from Automation Direct are multi-function digital units. They incorporate a multi-function digital counter, timer and tachometer all within the same unit. This means that you have fewer stock items and the learning curve is minimized. The CCT series are easily configured as a digital counter, timer, combination timer-counter or tachometer.

The two colour LCD display shows present values, setting values and menu parameters during setup. Process control parameters are easily set using the externally accessible DIP switches or the lockable keypad. We will be looking at this versatile multi-fictional device. Let’s get started. Continue Reading!

Productivity 1000 Series PLC Drum Sequencer Instructions

The productivity series of PLCs has a Drum and Sequencer instruction.
Drum instructions are great tools. They mimic an electromagnetically drum sequencer. Have you ever seen the mechanisms of a music box? Ok so it’s a little drum with pegs that catch and flick the chimes in a particular sequence to play whatever tune is on the drum. So in the PLC you can have a drum driven by an event, (input from a limit switch or button), or by time.

Sequencers are similar to the drum instruction. The sequencer output can have up to 16 Boolean, Integer or Numerical Tags per step. Drum instruction outputs are limited to the same 16 bit (Boolean) outputs. Each step in the sequencer can be defined by time or /and event and specified outputs can be set going into and out of the step.
We have done similar Drum instructions for the BRX Series PLC and the Click PLC.
BRX PLC Drum InstructionVideo
Click PLC Drum InstructionVideo
We will be discussing the drum and sequencer instructions in the Productivity Series PLC. Simple examples will be done to demonstrate the power of these instructions. Let’s get started. Continue Reading!

C-More Micro HMI Object Numeric Entry

The C-More Micro HMI Panel software uses virtual components called Objects. These objects are programmable to simulate the functions that you require on your automation project. Several of these objects can be placed on one panel screen and you can have multiple panel screens. This helps you produce simple, intuitive looking human machine interfaces.

Continuing from last time we will now look at the numeric entries that we can use with our HMI micro panel. Let’s get started. Continue Reading!

PLC Fiddle Shift Register Challenge

Shift registers will move (shift) bits in a word (register) to the left or right.

If we look at an example of boxes moving along a conveyor belt, the boxes would represent the bits in the register. The movement of the conveyor would be the shifting of the register that represents the movement of the boxes.

Shift registers are a form of sequential logic, which involves the present inputs and the prior history. All of the prior history is remembered.
We will be making a shift register in PLC Fiddle with the instructions provided. The output of the shift register will then be looked at for a reject area. Let’s get started. Continue Reading!

Productivity 1000 Series PLC Program Control

The program control method and instructions will allow us to specify what parts of the logic get solved and when this happens. This will control how the PLC will scan and solve your logic in your program using a synchronous PLC Scan. Understanding the PLC program scan will explain the synchronous and asynchronous program scanning.
Individual ladder logic programs get solved left to right, top to bottom. The result of the rung before is available for the next rung. The Task Management provides a method to clearly see the overall flow of your PLC program. Looking into the folders of the task management we can see blocks of code. These blocks of contain the ladder logic that will solve our logic. Instructions within the ladder logic code can also determine how the PLC will solve the logic.

We will be looking at using program control in the Productivity 1000 Series PLC.
Let’s get started. Continue Reading!

C-More Micro HMI Object Buttons and Indicators

The C-More Micro HMI Panel software uses virtual components called Objects. These objects are programmable to simulate the functions that you require on your automation project. Several of these objects can be placed on one panel screen and you can have multiple panel screens. This helps you produce simple, intuitive looking human machine interfaces.

Continuing from last time we will now look at the buttons and indicators that we can use with our HMI micro panel. Let’s get started. Continue Reading!

PLC Fiddle Compare Challenge

Just about every program usually has some data comparison instruction. This is the ability to compare information from one area of the controller to another and act on results. The output of this comparison conditions the logical continuity of a rung. PLC Fiddle is a free online browser simulator and has the following compare contact instructions.
= (if Equal contact)
<> (if Not Equal contact)
> (if Greater Than contact)
>= (if Greater Than or Equal contact)
< (if Less Than contact)
<= (if Less Than or Equal contact)
We will be looking at these instructions along with some programming challenges. As a system integrator, this ability can prove very useful to you in the field when commissioning your automation system. We will look at these compare instructions and show the parameters required to program them. Our compare challenges will help you gain a good understanding of how we can use compare in the PLC. Trying these challenges with PLC Fiddle is fun and will help you with PLC programming. Let’s get started. Continue Reading!

Productivity 1000 Series PLC Array Functions Part 3

An array is a storage area for a group of common data type tags. They usually have some relationship to each other and need to be manipulated as a group.

Previously we defined an array and use this in an indirect addressing program. It sequenced bits in an output card indirectly. We then looked at the following instructions: Array Statistics (STA), Copy Array (CPA), Fill Array (FLA) and Shift / Rotate Array (SRA). We will now look at the final four array instructions:
Pack Boolean Array (PBA) – Pack an Array of Boolean tags into a destination Word Array
Pack Word Array (PWA) – Convert one 8 bit or 16 bit array into a 16 or 32 bit Destination Array tag.
UnPack Boolean Array (UPBA) – Unpack an Array of Word tags into a destination Boolean Array.
UnPack Word Array (UPWA) – Convert one 32 or 16 bit array source tag into four 8 or 16 bit array tags.
Let’s get started with our final look at arrays in our Productivity 1000 Series PLC. Continue Reading!

C-More Micro HMI Object List Shapes

The C-More Micro HMI Panel software uses virtual components called Objects. These objects are programmable to simulate the functions that you require on your automation project. Pushbuttons, switches, meters and graphs are just a few of the objects that are available to you.

We can place several of these objects on one panel screen and have multiple panel screens. This helps you produce simple, intuitive looking human machine interfaces.
We will be looking at our program we have so far developed (Simulate Project) and add shapes to our blank page. The navigation of the objects and additional information will also be discussed. Let’s get started. Continue Reading!

PLC Fiddle Math Challenge

PLC programming will often involve math equations that need to be solved. Every manufacturer of programmable logic controllers will include math logic for you to use in your programs. Numbering systems play an important role. You can usually perform math using BCD (Binary Coded Decimal), Binary or Floating Point. Here is a link that will review the numbering systems in the PLC:
What everyone ought to know about PLC numbering systems

PLC Fiddles provides four basic BCD math and a move function for our circuits. Add, Subtract, Multiply Divide and Move. We will look at these math instructions and show you the parameters required to program them. Our math challenges will help you gain a good understanding of how we can use math in the PLC. Trying these challenges with PLC Fiddle is fun and will help you with PLC programming.
Let’s get started. Continue Reading!

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