Fb 155 Lochsteg Input Via Tape - Siemens SINUMERIK 840 Planning Manual

5 Configuring
5.14 FB 155 Input via tape
5.14 FB 155 LOCHSTEG
Input via tape
Description
FB 155 loads the magazine with tool data via one of the main NC programs. The block gene-
rates its buffer DB (DB 135) in the initial setting and calculates the parameters.
In the initial setting, it also checks the initialized M function and enters the stop state (STS) if
any parameter is not valid; (accumulator 1: 0155, accumulator 2: 0030). Only M function num-
bers from "1 to 99" are valid. A check is made to find out whether the block has reserved
another dynamic buffer; if so, this buffer will be declared unassigned.
FB 155 is called unconditionally and constantly checks both the bit of the initialized M function
for "1" and the channel No., which was written into DW 3 by the NC cycle. After initiation, the
control word is preset and the R parameters read and written into the DB buffer (DB 135).
Then the data is converted and written into the DB buffer in the same manner as it has been
transmitted after the search for a free dynamic buffer in a single block transfer.
If all dynamic buffers are reserved, the request remains active until a free buffer is found; there
is no interrupt. Any subsequent, new initiation via the loading cycle is stored and initiates a
new processing cycle after the current job has been processed.
The dynamic buffer is only declared unassigned if no further job is pending. The data distribu-
tor is informed via the command code "Last cutting edge" that all tool data have been trans-
mitted.
At the first initiation, the user transfers the function number of the loading type "BELA" as flag
byte and the read disable as one bit. It should be ensured that the parameters entered by the
user are not used by FB 155 as scratch flags. Otherwise, the output parameters could be ex-
ceeded!
The user must route the read disable in line with FB 155. As long as the NC cycle has not
transferred the channel No. to the FB 155, the DB number of FB 155 is entered in the output
parameter as a pseudo DB (DB 135). The read disable is then constantly reset.
The FB 155 cooperates with the NC subroutine L 940, Loading cycle. The cycle L 940 reads
the PLC number (PLC MD) and NC channel number and transfers these data to the
corresponding PLC (DB 135, DW 3).
Response to NC stop
In the case of an NC stop, the NC program stops at the current block; FB 155 remains active
und waits for another M function. At the NC start, the NC program continues in the following
block and loading of the magazine is continued.
Response to "Reset"
The current tool is deleted from the magazine table in the case of a "Reset" of the NC to
avoid any incomplete entries in the magazine table; the dynamic buffer is declared unassigned
and is no longer ready.
Response to "Mode change"
The following modes correspond to an NC stop:
• REPOS, INC FEED X, JOG
The following modes correspond to a reset:
• MDI AUTOMATIC, PRESET, REFPOINT
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SINUMERIK 840/880 (PJ)