Horner XL4 Compare and Move Instructions

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 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 will show a picture of each of the lights. Continue Reading!

Omron C20K, C28K, C40K, C60K Troubleshooting

The Omron C20K, C28K, C40K and C60K shoebox programmable logic controllers have been discontinued since March of 2002. These ‘K’ series PLCs were a popular controller and have been in installations for over 25 years. We will take a look at this PLC and review some troubleshooting techniques. Planning for the eventual fatal failure of the CPU will also be discussed. Continue Reading!

Horner XL4 Numbering System and Addressing

We will now look at the Horner XL4 numbering system and addressing. Data is stored into 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 of the HMI communication. Let’s look at all of the areas in the controller. Continue Reading!