Siemens SINUMERIK 840D sl Function Manual page 1024

Detailed description
2.6 Interface structure
Signals PLC/NCK channels
The signal groups below must be considered on the interface:
• Control/status signals
• Auxiliary/G functions
• Tool management signals
• NCK functions
The control/status signals are transmitted cyclically at the start of OB1. The signals entered
in the channelspecific interface by the HMI software (HMI signals are entered by the PLC
operating system) are also transferred at this time if the signals have been defined on the
operator panel front, and not on the MCP.
Auxiliary functions and G functions are entered in the interface data blocks in two ways.
First, they are entered with the change signals.
• M signalsM00 - M99 * (they are transferred from the NCK with extended address 0) are
• In the case of the G functions, the group is additionally decoded and the G functions
• S values are also entered together with the related M signals (M03, M04, M05) in the
When the tool management function is activated in the NCK, the assignment of spindle or
revolver and the loading/unloading points are entered (DB71-73) in separate interface DBs.
The triggering and parameter assignment of NCK functions is performed by means of PLC
function calls.
The following function calls are available, for example:
• Position a linear axis or rotary axis
• Position an indexing axis
• Start a prepared asynchronous subprogram (ASUB)
• Read/write NC variables
• Update magazine assignment
Some of the above functions are described in their own function documentation.
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also decoded and the associated interface bits set for the duration of one cycle.
* M signals M0 - M99 are transferred from the NCK with extended address 0
which are active in the relevant group are entered in the interface data block.
spindlespecific interface. The axisspecific feedrates are also entered in the appropriate
axis-specific interface.
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0