MikeyN

Do you mean JSR? This is the Jump to Subroutine instruction. It should go in your logic like any other output. Input conditions on the left, JSR on the right. Once the instruction has been placed, you can add or remove input and output parameters by right clicking the instruction itself and selecting Add Input Parameter, Add Return Parameter, or Remove Instruction Parameter.

What message were you getting when it denied you? The solid red fault light indicates a "processor hardware fault or critical fault" according to the manual. Do you have another MicroLogix 1500 that you can test this on? What happens if you leave the current MicroLogix sitting overnight to run without the HMI attached?