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08.89
User interface Output buffer (Figure "Transfer from user interface")
User
interface output
DB102
Acknowl. sig.
Identific.DB,DX
User
Fct.no.
Id6
Id7
Id8
interf. x
Error no.
DB/DX
DW no.
Useful data DB/DX
Useful data length
Useful data
Transfer from user interface
For output of a message frame, the user supplies the corresponding user interface in DB102,
i.e. he/she enters the function number, the 6th to 8th identification character, the error number
and the reference to the useful data. Thereafter, he/she sets the acknowledgement signal
"output" for the corresponding user interface.
The PLC operating system evaluates the acknowledgement signal and transmits the data into
a free output buffer in the MPR. The useful data are copied by the useful data DB/DX into the
data field of the output buffer. In order to generate the addressing data, the specifications of
the allocation table in data block 99 are loaded into the output buffer.
By setting the data validity bit it is indicated to the COM area that a message frame to be sent
is waiting in the output buffer.
If the message frame was able to be be sent, the acknowledgement signal output is deleted
and the user interface cleared.
© Siemens AG 1989 All Rights Reserved
SINUMERIK 840/880 (PJ)
PLC
PLC
OS
Allocation list
user interface/log.
partner
DB99
log. partner sender
log. partner dest.
receiver location
6FC5 197-0AB20-0BP0
5 PLC
5.1.1 User interfaces
MPR
COM
O
I
O
I
O
I
O
I
O
I
O
I
5–5
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