Looking for a PLC+HMI with FREE software? Give Unitronics a try.

UniStream^® Programmable Controllers Series

Powerful programmable controllers with incredible HMI features—backed by the most efficient programming software you have ever used. Execute high-end projects — on time and within budget.

Available in three All-in-One series: UniStream Modular, UniStream Built-in and UniStream Cloud.

UniLogic^® – UniStream Software

Here is a quick tip as you get started.  Within the free UniLogic Software, you will run across a term called Structs. 

What are Structs?

A struct is a complex data type declaration that defines a physically grouped list of variables (of different data types) to be placed under one name in a block of memory, allowing the different variables to be accessed via a single declared name which returns the same address.

In Unilogic there are four types of Structs:

System Data Tag Structs
System Data Tags service the UniStream system. These tags are organized into Structs.
Automatically-created Structs
These are created by the software when you add elements to your application including:
– Hardware Structs that serve hardware elements such as I/O and COM modules and modems
– Communication structs such as MODBUS and CANopen.
– Function Structs, such as PID.
Timer Structs
These are created when you add a Timer data tag.
User-defined Struct
You define these and reuse them in your program. Each instance may contain different power up values.

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