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S5-115U Manual
Description of the Status and Data Management Bits
The status bits and the data management bits can be set/reset and evaluated both by the user and
via data handling blocks.
The table below shows the situations in which these bits are set or reset.
Bit No.
Set by
0
DHB
1
DHB
(as soon as the CP
receives a job
request)
2
DHB
(if the job was
completed without
error)
3
DHB
(if the job termi-
nated with error).
(The cause of the
error is stored in
the high-order
byte of the job
status word).
EWA 4NEB 811 6130-02b
Table 11-7. Accessing the Job Status Word
Reset/
Overwritten by
DHB
DHB
(when the CP
serviced the job
request)
DHB
(if the job is
reinitiated)
DHB
(if the job is
reinitiated)
Evaluated by
•
RECEIVE block
(When this bit is set, handshaking
with the CP is initiated).
•
User
(Scan to see if there is a frame).
• SEND/FETCH block
(A new job is sent only after the old
job has been processed).
• User
(Scan to see if a new job is to be
initiated).
User
(Scan to see if the job was
completed without error).
User
(Scan to see if the job was
completed without error).
Integral Blocks
11-17
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