Siemens SIMATIC S5 Manual page 301

Troubleshooting
when there is an operator error with COM247,
when the COM247 software accesses floppy disk or hard disk drives,
when COM247 is communicating with the IP247 and
when machine data and machining programs are input.
The software of the IP247 generates two types of error messages for module errors:
the actual axis errors which lead to a traversing movement being aborted and
warnings or indications which are simply to inform the user (errors 1 to 9).
If an axis error is displayed in COM247, not only the error number but also a message is dis-
played, so that the cause of the error can normally be recognized immediately.
There are, however, some error messages which require further explanation to allow you to find
the cause of the error and to remedy it more quickly. Some error messages are therefore ex-
plained in more detail.
Error 1 (COM247: F81
Owing to mechanical inertia, the module cannot execute the jobs as quickly as they are
being entered. The last job entered from the PG has been lost and must be repeated.
The last job sent from the PC or PG either has no defined mode or is not feasible at this
point. Example: starting an axis which is already running, The active mode is terminated
and an error message output.
Error 5 (COM247: F85H, PC: 5) 'PC job list is full"
Corresponds to error 81 from the point of view of the PC. The last job must be repeated.
Error 6 ( COM247: F86H, PC: 6) "motor waiting for external statt"
The execution of the selected mode is blocked by a signal"1" at the digital input "external
start-stop" (=> Section 2.8.4 "External Start-Stop").
Error 7 (COM247: F87H,PC: 7) "speed range exceeded"
If, in the JOG or incremental modes, a speed is specified in the speed parameter which
corresponds to a frequency outside the limits 1 Hz... maximum frequency, the traversing
frequency is set to the limit of the frequency range and this message is output.
Error 10 (COM247: F8AH, PC: 10) 'Yeference point does not exist"
After switching on the power and loading machine data for the first time and when
changing certain machine data, the reference point is missing. Execute mode 5 reference
point approactv'set reference point.
7 - 3 4
, PC: 1) 'PG job list is full"
H