When you turn the power on, and hook the comunication cable up do you have to configure the micrologix 1200. Or do any thing before you start writing the program?
You need to plan, if you know you need two output cards and 1 input card, put it in the I/O configuration. If you are designing a system, you should have an idea of what you need.
You can write the program without the I/O configuration, but it will give you errors if you try to verify it, until you put the correct configuration in.