IR area doesn’t have predefined memory locations, but is meant for general use in the program. Of all the locations this memory area consists of, only those directly connected to PLC controller input/output lines are of interest for this appendix. IR area can be divided into 3 parts: 1. Input area is located from word IR000 to IR009, totaling 160 bits. Most important of these are in the word IR000 because they are directly connected to screw terminal of PLC controller. Input IR000.01 is directly connected to screw terminal marked with 01 on the casing of the PLC controller.2. Output area is located from word IR010 to IR019, totaling 160 bits. Most important of these are in the word IR010 because they are directly connected to screw terminal of PLC controller. Output IR000.00 is directly connected to screw terminal marked with 00 on the casing of the PLC controller.3. Working area is located from word IR200 to IR231 totaling 512 bits for general use.As IR memory area does not have predefined memory locations, more detailed explanations are not necessary.