Have just installed a new PLC (C200hx), and downloaded a program which i wrote previous and is working in identical circumstances in other machines. The problem is when tring to set the PLC clock through AR18 - Ar20. Whatever i write to set the date is instantly overwritten with gibberish. Ie/ i set Ar20 to 0009Hex, which should correspond with month 9, year 00. As soon as this is entered, it gets overwritten with 4020Hex. The register is called and written to when setting the times from the NT631 touchscreen, but only with Ar21.14 on, which is again set from the t/screen. Is this an inherent fault or just a failure of the CPU. I cannot find the reason. Anybody who may know, please respond. Its not the end of the world, just weird.