Hi,

I trying to edit a ladder diagram with OMRON CS1G PLC.
I need an alarm to be triggered after 3 months.

If I use a combination of NO instruction with 1 minute interval and CNT instruction, the max count is 9999 x 1 minute, which is equal to 166.65 hours or 6.94 days.
Is there any other special instruction/timer to count more than that?

 

How about cascading counters? Compare the count bit of the first counter with a constant 9999 then increment the second counter one step. Reset the first counter and let it count up to 9999 again and repeat. You'll get to ~three months in 12 counts.

 

Hi brother,

thanks a lot. I didn't even thought about it. I'll try.

 

I need an alarm to be triggered after 3 months.

what possible use could a time dependant alarm of 3 months be?, unless it was an embedded service call. Query your system date and time registers.

 

what possible use could a time dependant alarm of 3 months be?, unless it was an embedded service call. Query your system date and time registers.

There are, unfortunately, some malicious applications of long delay timers.