Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
25
A4: Digital and analog NCK I/Os for SINUMERIK
840D sl
1
1.1 Introduction
Function
Signals can be read and output in the interpolation cycle via the inputs/outputs of the fast
digital and analog NCK I/Os. The following functions can be executed with these signals, for
example:
● Several feedrate values in one block
● Several auxiliary functions in one block
● Rapid retraction on final dimension
● Axis-specific delete distance-to-go
● Program branches
● Rapid NC Start
● Analog calipers
● Position switching signals
● Punching/nibbling functions
● Analog-value control
Hardware
The SINUMERIK 840D sl hardware has three 14-pin I/O interfaces X122, X132 and X142 on
the NCU on-board. Only X142 is available as a fast NCK I/O.
There are four fast digital inputs and four outputs on the X142 that can be addressed via the
first address byte and via the $A_IN[1...4] and $A_OUT[1...4] system variables.
ET 200 modules can also be connected to the PROFIBUS DP/MPI interfaces X126 and
X136. This enables the number of digital and analog NCK I/Os to be expanded by 32 and 8
respectively. These NCK I/Os are called external NCK I/Os in the following.
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