Technical data

Lines 6 to 8 (CONTROL BITS)
Control bit Meaning
WECK-FE
Collision of time interrupts:
an attempt was made to call a particular time
interrupt OB a second time while or before first
call was processed
Table 5-5 continued:
BCF
Operation code error:
- substitution error: processed STEP 5 operation
cannot be substituted
- operation code error: processed STEP 5 operation
is incorrect
- parameter error: parameter of the processed
STEP 5 operation is incorrect
FE-6
Not used
FE-5
Indicates a serious system error, additional
information in RS 80
FE-4
Power down error:
processing of a previous power failure (NAU)
by the system program did not run correctly;
WARM RESTART is therefore not possible
FE-3
Interface error (SSF)
LZF
Runtime error:
- called block not loaded
- load/transfer error with data blocks
- other runtime errors
REG-FE
Error processing the controller structure R64
in the CYCLE
DOPP-FE
Double call error:
a still active error program processing level
(ADF, BCF, LZF, QVZ, REG, ZYK) is
activated a second time (COLD RESTART
required)
5
Control Bits and Interrupt Stack
CPU 928B Programming Guide
C79000-B8576-C898-01
5 - 17