m.nazish:
You really need to explain better your system, and what you are talking about.
A PLC5, an SLC500, a MicroLogix, a Logix, or any other PLC I can think of would never have a CYCLICAL Program scan that long... Now, if you are talking about a timed task, or a periodic interrupt task, perhaps.
If you are talking communications to an HMI, maybe.
If you are actually talking the CYCLICAL (LAD-2) program scan, that's a problem.