Result
After correct and error-free processing, the system program enters the
value ’0’ in ACCU-1-L.
Note
By calling OB 122, the RLO (undefined) is influenced. The BR
register is not modified.
To disable and enable processing interrupts, you can also use the
STEP 5 operations IA and RA instead of OB 122. The blocking of
interrupts is cleared at the next system checkpoint (refer to
Chapter 11).
Possible errors
The errors listed in the following table can occur. If one of these error
does occur, the system program writes the error ID shown in the table
into ACCU-1-L.
ID Meaning
F001H Illegal function number
Example
Table 6-3 Error IDs of OB 122 in ACCU-1-L
Excerpt of a STEP 5 program in which all
interrupts are disabled using OB 122 immediately
before a critical program section following which
they are enabled again:
:L KB 1 Load function ID in ACCU-1-L
:JU OB 122 Disable all interrupts
:)
:)
:)
: } Critical program section
:)
:)
:L KB 2 Load function ID in ACCU-1-L
:JU OB 122 Enable all interrupts
:
:
OB 122: "Disable Interrupts" On/Off
CPU 948 Programming Guide
C79000-G8576-C848-04
6 - 13
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