July 2013 8.1 Display and operation 1177
Error list The columns of the error list (ERR key) have the following meanings:
 Number: Error number (–1: no error number defined), assigned by 
HEIDENHAIN or the machine tool builder
 Class: Error class. Defines how the iTNC processes this error:
• ERROR: Collective error class
The error reaction depends on the status or current operating mode of 
the control
• FEED HOLD: The feed-rate entry is cleared
• PGM HOLD: Program run is interrupted (control-in-operation symbol blinks)
• PGM ABORT: Program run is canceled (internal stop)
• EMERG. STOP: An emergency stop is triggered
• RESET: iTNC performs a reset
• WARNING: Warning message, program run is continued
• INFO: Informational message, program run is continued
 Group: Error source. Shows the cause of the error:
• GENERAL: Other error
• OPERATING: Error during machining
• PROGRAMMING: Error during editing
• PLC: Error by the PLC
 Error message: Error text displayed by the iTNC
PET table The PLC error message table (*.PET) consists of the following columns, to 
which you can assign special attributes:
 NR 
Line number in the table. The modules select the PLC error message by 
assigning the line number.
 ERROR 
With the HELP key you can display information on the error messages. (see 
"Help" on page 1189). 
There are three ways to specify the error text:
• Direct entry of the error text (max. 32 characters)
• Line number of the PLC error text file (# <line no.>) specified with 
PLCERROR= in OEM.SYS.
• Number of the string memory containing the error text (# <string no.>)
 MARKER 
The PLC error message can be activated without module call by setting the 
marker defined here (M4800 to M4999). The marker is also set if the error 
message was activated through Module 9085.
Entry 0: No error marker
 RESET 
0: No NC reset upon activation of the error message. Error display does not 
blink. 
1: NC reset upon activation of the error message. Error display flashes.
 NC-STOP 
0: No NC stop upon activation of the error message 
1: NC stop upon activation of the error message (M4221 is set)