Useful Data Of The Function "Read/Write Nc Data Via Command Channel - Siemens SINUMERIK 880 SW 6 Planning Manual

01.93
14.4.10 Useful data of the function "read/write NC data via command
d)
channel"
Function numbers 10 and 11
You can use the functions "read/write NC data via command channel" to exchange data
directly between the PLC and the NC. Data transfer using these command channel functions is
much faster than transfer using function blocks FB 61 and FB 62.
When the function "read NC data via command channel" is executed the PLC user program
inputs the length and the specification of the data in the useful data DB/DX. The PLC operating
system enters the number of words read and the supplied NC data in the target DB/DX.
The useful data DB/DX and the target DB/DX can be identical. In this case, the PLC operating
system overwrites the data specification with the supplied data. The length is replaced by the
number of words read.
When the function "write NC data via command channel" is executed the PLC user program
inputs the length and the specification of the data and the actual data in the useful data
DB/DX.
Note:
In GA2, software version 1, only the transfer of data group 03
with absolute values" (IKA data) is possible with the functions "read/write NC data via
command channel".
Useful data
DB/DX
Bit 15
DW x
Channel number
DW x+1
Data group identifier
DW x+2
DW x+3
DW x+4
Number format
DW x+5
Length and specification of the data for the function "read/write NC data via command channel"
OCB = Offset Control Bit
_______
d) with GA2, software version 1 and higher
© Siemens AG 1991 All Rights Reserved
SINUMERIK 880 (PJ)

14.4.10 Useful data of the function "read/write NC data via command channel"

DL
Length in useful data in words
Number of parameters
Data type
Data number
OCB Offset data type/number
Dimension identifier
6ZB5 410-0HE02
14 Command Channel (DB 41)
"interpolatory compensation
H
DR
Bit 0
d)
14–25