Data Transfer Between Nc And Plc - Siemens SINUMERIK 880 SW 6 Planning Manual

05.91
1.3.6

Data transfer between NC and PLC

Data not transferred via the standard interfaces can also be exchanged between the NC and
PLC areas. The data transfer can be triggered on the initiative of the NC or PLC.
Data transfer with PLC initiative
The PLC user program parameterizes and calls the function macros FB 61 (read NC data) and
FB 62 (write NC data).
Data driver
Data
NC
Data transfer on PLC initiative
Data transfer with NC initiative
In the case of data transfer on the initiative of the NC, the PLC user program is generally not
1)
affected ; the data transfer routine on the PLC side is performed by the PLC operating syst-
em.
–––––––
1) In the event of indirect addressing via the NC/PLC data channel (NC initiative), the PLC user program must
make data addresses available (this can occur, for example, with specially programmed functions in the
UMS).
© Siemens AG 1991 All Rights Reserved
SINUMERIK 880 (PJ)
1.3.6 Data transfer between NC and PLC
Command
Data type
Data
6ZB5 410-0HE02
1 General Overview
FB 62
Write NC DB
data
Data
FB 61
Read NC
data
PLC
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