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S9F11 (data too long) is a message sent when large data cannot be processed.
XCom automatically sends S9F11 when a message larger than Communication Buffer Size is received.
How to set Communication Buffer Size.
1) Run the XCom Configuration tool
2) Select the Configuration tab.
3) Sets the Communicatin Buffer Size information.
4) Save the XCom Configuration file.

Communication Buffer Size typically uses 100,000 to 1,000,000 bytes.