Siemens SINUMERIK 840D sl Function Manual page 60

A4: Digital and analog NC I/O for SINUMERIK 840D sl
2.4 Direct I/O access without PLC
I/O range
If slots are configured for a PROFIBUS/PROFINET slave used for the NC I/O in such a way
that they are in ascending order without gaps, they are called the I/O range in the following.
An I/O range is therefore characterized by:
● Logical start address: Logical start address of the first slot of the PROFIBUS/PROFINET
slave
● Length: Total length of all slots used for the PROFIBUS/PROFINET slave
The parameterization of the logical start address and the length of the I/O range is performed
in the NC via machine data (see "Parameter assignment (Page 61)").
Reading/writing
The following options for reading/writing the NC I/O are available on the NC:
Part programs / synchronized actions: System variables
The reading/writing of the NC I/O is performed in the NC via system variables in the interpolator
cycle. The writing on the NC I/O is performed after the interpolation cycle.
Data consistency: Interpolator cycle
See "System variables (Page 62)".
Compile cycles: Bindings
Reading/writing via the compile cycle interface.
Data consistency: Position Control cycle
See "Bindings (compile cycles) (Page 64)".
Parallel reading/writing
Reading
Parallel reading through compile cycles and part programs / synchronized actions on input
data of the same I/O range is possible. Write access to the NC I/O is performed in different
ways.
● The data consistency is ensured.
● The data equality during an interpolator cycle is not ensured.
Writing
Parallel writing through compile cycles and part programs / synchronized actions on output
data of the same I/O range is not possible.
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions