IFM Ecomat 300 AC1355, Supplementary Device Manual

Page: 240 / 248

Troubleshooting
Hardware error, exception error
14-2
14.2 Hardware error, exception error
Exception Error
STKOV: STKUN:
Seg: Off:
SP: R0:
CP: TFR:
O O K K E E S S C C
> The main processor has detected an exception error
> All current activities are interrupted
► Power the controllere off and on again
NOTE
If this error message is shown immediately after power on, the execution of the PLC program can be
prevented:
► During power on press the left function key of the device and keep it pressed.
> The PLC program is declared as "non valid", no longer initialised and no longer executed.
Following indications in the TFR register provides details concerning the error cause:
TFR Register
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
NMI STKOF STKUF – – – – – UN
DOP
C
– – – PRTFLT ILLOPA ILLINA ILLBUS
Bit Name Possible error source
NMI non maskable interrupt hardware
STKOF stack overflow PLC program / hardware
STKUF stack underflow PLC program / hardware
UNDOPC unknown machine command PLC program / hardware
PRTFLT 32-bit code error PLC program / hardware
ILLOPA invalid access to 16-bit operand PLC program / hardware
ILLINA invalid jump address PLC program / hardware
ILLBUS invalid access to external bus hardware
Examples:
TFR 0004 invalid access to 16-bit operand, e.g. by the PLC
TFR 0002 invalid jump address, e.g. by the PLC