Allen Bradly RS Logix 5000
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The RSLogix™ family of IEC-1131-compliant ladder logic programming packages helps you maximize performance, save project development time, and improve productivity. This family of products has been developed to operate on Microsoft Windows® operating systems.
These RSLogix products share:
Flexible, easy-to-use editing features
Diagnostics and troubleshooting tools
Powerful, time-saving features and functionality
The Way We Used To Be
Earlier Allen Bradley PLCs programmed with RSLogix 5 and RSLogix 500 software had data files to store I/O and other internal values. These different data files could only hold one data type. A data type defines the format and the size of the stored value.
While this method made it easy for using instructions, it provided a challenge for logically grouping different data types together according to function. For instance, in machine control, a motor may have a start, stop, speed and alarm code each with its own data type. Thus, the data was â€œscatteredâ€ throughout the data files.
Logix5000 controllers are true 32-bit controllers, meaning the memory words are 32-bits wide. No matter what, a tag always reserves 32 bits of memory even if it is a Boolean or integer data type. For this reason, it is best to use a DINT when dealing with integers. Furthermore, a Logix5000 controller typically compares or manipulates values as 32-bit values (DINTs or REALs).
A Logix5000 controller lets you divide your application into multiple programs, each with its own data. The Scope of the tag defines if a tag is global (controller tags) and therefore available to all programs or local (program tags) to a select program group. Pay careful attention to this field as creating it in the wrong area may lead to some confusion later on as to its location.
Controller Tags are available to all programs. You cannot go wrong using controller scoped tags unless you easily want to copy and paste programs. A tag must be controller scoped when used in a Message (MSG) instruction, to produce or consume data and to communicate with a PanelView terminal.
Program Tags are isolated from other programs. Routines cannot access data that is at the program scope of another program. Having program tags make it easy to copy/paste programs and not have to worry about conflicting tag names. Make sure though that no controller tags are named the same as program tags.
Style is the form in which to display the tag by default. The following table provides you with information on the base and notation used for each style
An Easier Way to Create Tags
The easiest way to create tags is on the fly while programming. When an instruction is first used a â€œ?â€ will indicated the need for a tag. There are three options at this point:
Double click on the â€œ?â€ and select an existing tag from the drop down box.
Right click on the â€œ?â€ and select new tag.
Double click on the â€œ?â€ and type in the tag name. If it does not all ready exist, then right click on the tag name and select Create â€œNewTagNameâ€. Be careful with this method not to use spaces or special characters.
The nice thing about all these methods is that RSLogix5000 will automatically fill in the correct data type according to the instruction used.
Another quick method is to drag and drop an existing tag to a new instruction. Make sure to click on the tag name rather then the instruction.