Cannot update target price

I was trading IDBI today and target was 87.5 , but when the stock was trading around 85.6 or 85.7 i renewed my target price to 89 . A modification request was send but before it was renewed my target was hit . Now the time when it was modified was around 10 minutes before the target was hit .Why does it take so much time to renew a price . some days prices get renewed within seconds …whats the reason behind this ?

This can happen only if one is trying to place/modify order beyond the prescribed circuit limit at that time.

So any way to find out prescribed circuit limit ?