Hi, I am working on modifing a ladder code which read and validate a barcode. However, the code doesn't have any documentation on it. I am new to PLC programming, but I know that the instruction code of the movd function contains 4 digits. For example: #ABCD, A is first souce digit, B is number of digit, C is first destination digit, D is not used. But in my PLC code, the some instruction codes only contain 1 or 3 digits. For example, #100, #1. I do not have a work simulator. I don't know what that is telling the PLC to do. Thanks.