Technical data

Signalling and error LEDs
BASP LED
This indicates whether the S5 bus signal BASP (disable command
output) is active:
In the single processor mode, the CPU clears BASP when it changes
to the RUN mode and sets BASP when it changes to the STOP mode.
BASP is activated in the RESTART and in the STOP mode and in the
first cycle following a warm restart.
In the multiprocessor mode, the conditions for BASP are identical
with those in the single processor mode, provided the switch on the
coordinator is set to RUN. (See your System Manual (/2/ in Chapter
13) for more information on the "Test mode" special case.)
Note
If BASP is active, all digital outputs are disabled.
If an AUTOMATIC or MANUAL WARM RESTART has been
executed before the transition to the RUN mode, the BASP LED
goes out only after the remaining cycle has been processed.
"QVZ" LED Timeout of an I/O module.
"ADF" LED Addressing error; the user program has accessed an address in the
process image for which there is no module inserted in the I/Os.
"ZYK" LED Cycle error; cycle monitoring time has been exceeded.
The errors ADF and QVZ can only occur in RESTART and in RUN,
the cycle error ZYK can only occur in RUN.
At the end of the program processing levels ADF, QVZ or ZYK, the
error LED is cleared by the system program, if the CPU has not gone
to the STOP mode.
Introduction and Overview
CPU 928B Programming Guide
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