Practical Tips and Techniques
Compare and move instructions in the Horner XL4 OCS all-in-one controller can be very powerful. We will be looking at how to use these compare and move instructions. Combining these two instructions to build a sequencer, we will apply this to an application example. Our application will be a simple traffic light. The HMI screen … Read more
Timers and counters are used in the majority of PLC programs. We will not look at how timers and counters can be programmed in the Horner XL4 OCS all-in-one controller.
We will now look at the Horner XL4 user interface. The HMI (Human Machine Interface) part of the XL4 all in one controller will be what the operator views. We will look at the features of the display and learn how our program will control what the display will show.
We will now look at the Horner XL4 numbering system and addressing. Data is stored in different memory-type locations called registers. The registers can be either bits or words (16bit). Multiple registers can be used together to store a 32-bit value. (Double word) This all in one controller has several additional registers to handle some … Read more
We will now look at the parts of a PLC system. When I was in school PLCs were just in their infancy. We were taught that the PLC consisted of the central processing unit (CPU), analog and digital inputs, and outputs. Everything was programmed with dedicated handheld devices and/or software devices on specialized hardware. We … Read more
We program the Horner XL4 OCS all-in-one controller by using Cscape. We will now use our Cscape software to establish communication. Last time we customized Cscape with icons to make it easier to find, communicate and control the unit. There are two different ways to communicate to the XL4 OCS controller, Ethernet and Serial. There … Read more