By default, ProScreener in ProRealTime limits historical data to 512 bars for performance reasons. If you need more history for scanning or backtesting conditions, the limitation may be due to:

1. Built-in ProScreener Constraints – The platform enforces a maximum of 512 bars in scans to optimize execution speed.
2. Timeframe Selection – Lower timeframes (e.g., 1-minute or 5-minute charts) will reach the 512-bar limit quickly, restricting the available historical data.
3. Platform or Subscription Limitations – Depending on your ProRealTime version (free vs. premium), data history may be restricted.

Solution

While you cannot directly extend the 512-bar limit in ProScreener, you can work around it using the following methods:

1. Use Higher Timeframes

   • Instead of scanning on a 1-minute or 5-minute chart, try using higher timeframes (e.g., 1-hour, 4-hour, or daily). This allows you to access a longer historical range within the 512-bar limit.

2. Upgrade to a Premium Data Plan

   • If you’re using a free version of ProRealTime, consider upgrading to ProRealTime Complete or Premium to unlock more data access.

Although ProScreener is limited to 512 bars, these workarounds can help you analyze a longer history or switch to longer ones by switching your plan.