Table of Contents
Advertisement
Integral Blocks
Table 11-7. Accessing the Job Status Word (Continued)
Bit No.
Set by
4
DHB/SEND, RECEIVE
(if data exchange
has begun for a job
Example:
initiation with
DIRECT function but
exchange via ALL
function)
5
SEND block
(if data has been
transferred for a
job)
6
RECEIVE block
(if data reception
has been concluded
for a job)
7
User
(Access of the SEND
and RECEIVE blocks
to an area is
prevented at the
first data field. Jobs
already started are
terminated).
1
During data transfer between the CP and PLC, you can no longer modify the data for a job. This fact is not critical for
small data packets since, in this case, data exchange can be handled in one block pass. However, large amounts of data
can be transferred in blocks only. Consequently, data exchange can stretch over several program scans, depending on
the frame size specified in the SYNCHRON block.
11-18
Reset/
Overwritten by
DHB/SEND,RECEIVE
User
(if data exchange is
(Scan to see if the data frame has just
completed for a job)
been transferred).
• SEND block
User
(if data transfer has
(Scan to see if the dataset for a job
been started for a
has already been transferred to the
new job)
CP and when a new dataset can be
• User
made available for a current job).
(if an evaluation
was made)
• RECEIVE block
User
(if data transfer has
(Scan to see if the data frame of a
been started for a
new job has already been transferred
new job)
to the PLC and when a new data
• User
frame was transferred to the PLC for a
(if an evaluation
job currently in progress).
was made)
User
SEND-RECEIVE block
(The pertinent data
(If the bit is set, the blocks do not
area is enabled).
execute any data traffic. Instead, they
report an error to the CP).
S5-115U Manual
Evaluated by
1
EWA 4NEB 811 6130-02b
Advertisement
Table of Contents
