I have a Micrologix 1200 with a "Real Time Clock" installed. I didn't realize that the clock registers are read only and I need to be able to manipulate the clock from the HMI (not a laptop). So I am stuck trying to write some code to accomplish this. My first thought is to move the RTC value to a standard N register, then manipulating that value with up down counters from the HMI. The part that I am stuck on is; lets say the N value for the minutes is 3 higher than the RTC value. When the RTC value is 59 (minutes) the value on the HMI will read 62 (minutes). Any ideas? Thanks