Data Access Via Plc (Command Channel, Db 41) - Siemens SINUMERIK 840C Installation Instructions Manual

12 Functional Descriptions
12.19.5 Interpolation and compensation with tables
Note:
- y=No. of the IKA configuration; max. 2 places
x=Values
- The data set for an IKA configuration most not be larger than 255 characters.
• Output of IKA curves
%IKA2
Ny T5=x T6=x (up to SW 3)
Ny T5=x T6=x T55=x (SW 4 and higher)
:
Note:
y=No. of the curve; max. 2 places
x=Values
• Output of IKA points
%IKA3
Ny T7=x T8=x
:
Note:
y=No. of the curve point; max. 5 places
x=Values

Data access via PLC (command channel, DB 41)

Transfer of the IKA data from the PLC via the command channel is triggered by function
numbers 10 and 11. The data can be read (fct. no. 10, read IKA data) and written (fct. no. 11,
write IKA data). These functions are triggered in the same way as existing command channel
functions.
Note:
The parameters of %IKA1, %IKA2, %IKA3, of IKA Stage 2 are thus no longer supported (see
Section Overview of valid IKA data).
For further details about the "Command Channel" function,
please refer to the following documentation:
Extended functionality via communications area (DB 48)
As from SW 6 it is possible to act upon the NCK function "IKA" from the PLC via the extended
data block DB 48. Different signals are defined for each IKA relation which are used to
activate, deactivate and freeze a particular IKA relation. "Freeze" means that the last value
output from the IKA relation remains unchanged ("frozen") until that condition ("IKA frozen") is
changed. This function makes it possible to start several IKAs simultaneously. Output signals
have also been defined so that the PLC can recognize the status of every IKA. This makes it
possible to respond to a particular status, for example.
12–200
SINUMERIK 840C,
Interface Description, Part 1
Signals
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SINUMERIK 840C (IA)