Allen-Bradley Logix5000 Reference Manual page 642

Chapter 20 Debug Instructions (BPT, TPT)
642
When this trace is logged to disk, the characters before the colon appear in the
traces.
This indicates which tracepoint caused which trace entry. This is an example of a
trace entry. 'Analog inputs trace:' is the heading text from the tracepoint's format
string.
Analog inputs trace: Analog inputs = 31.00201, 30.282000, and 30.110001.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011