A4: Digital and analog NCK I/Os for SINUMERIK 840D sl
1.2 Access via PLC
Extended Functions
32 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Read actual value
The signal state of the digital NCK inputs is sent to the PLC:
DB10, DBB60 or DBB186 ... (actual value for digital NCK inputs)
The actual value reflects the actual state of the signal at the hardware input. The influence of
the PLC is ignored for the "actual value".
Disable input
Digital NCK inputs can be disabled individually from the PLC user program:
DB10 DBB0 or DBB122 ... (block the digital NCK inputs)
In this case, they are set to a defined "0" inside the control.
Set input from PLC
The PLC can also set each digital input to a defined "1" signal:
DB10 DBB1 or DBB123 ... (setting of the digital NCK inputs from the PLC)
As soon as this interface signal is set to "1", the signal state at the hardware input or the
input disable is inactive.
Behavior during POWER ON / reset
After POWER ON and reset, the signal level at the respective input is passed on. If
necessary, the PLC user program can disable or set the individual inputs to a defined "1" as
described above.
1.2.3.2 NCK digital outputs
Function
Time-critical switching operations can be triggered very quickly via the digital NCK outputs,
bypassing the PLC cycle times for the relevant machining and program-controlled (e.g. with
the block change).
The signal state of digital output <n> can be set or read again directly in the part program
using system variable $A_OUT[<n>].
There are also several ways of changing this set signal state via the PLC.
Applications
Digital NCK outputs are used, for example, for the following NC functions:
● Position switching signals (see Section "N3: Software cams, position switching cycles -
only 8
40D sl (Page 535)")
● Output of co
mparator signals
To Next Page
Loading...
Need help?
General
