Siemens SINUMERIK 840D sl Function Manual page 1023

Digital/analog inputs/outputs of the NCK
The following must be noted with respect to the digital and analog inputs and outputs of the
NCK:
Inputs:
• All input signals or input values of the NCK are also transferred to the PLC.
• The transfer of signals to the NC parts program can be suppressed by the PLC. Instead,
• The PLC can also transfer a signal or value to the NCK even if there is no hardware for
Outputs:
• All signals or values to be output are also transferred to the PLC.
• The NCK can also transfer signals or values to the PLC even if there is no hardware for
• The values transferred by the NCK can be overwritten by the PLC.
• Signals and values from the PLC can also be output directly via the NCK I/O devices.
Signals PLC/Mode group
The operating mode signals set by the machine control panel or the HMI software are
transferred to the operating mode group (MG) of the NCK. The mode signals are valid for all
NC channels of the mode group on the 810D and 840D. On 840D systems, several mode
groups can optionally be defined in the NCK.
The mode group reports its current status to the PLC.
Figure 2-5
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
a signal or value can be specified by the PLC.
this channel on the NCK side.
this channel on the NCK side.
Note
When implementing digital and analog NCK I/Os, you must observe the information in the
following references:
References:
/FB2/Function Manual, Extended Functions;
Digital and Analog NCK I/Os (A4)
PLC/mode group signals (e.g., mode group 1)
Detailed description
2.6 Interface structure
39