Siemens SINUMERIK 840D sl Function Manual page 840

P3: Basic PLC program for SINUMERIK 840D sl
13.9 Interface structure
Figure 13-4
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 channel-specific interface by the HMI (HMI signals are entered by the PLC operating
system) are also transferred at this time if they have been defined on the HMI operator panel,
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.
● The M signals M00 - M99 (they are transferred from the NCK with extended address 0) are
also decoded and the associated interface bits set for the duration of one cycle.
● For G functions, only the groups selected via machine data are entered in the interface
data block.
● The S values are also entered together with the related M signals (M03, M04, M05) in the
spindle-specific interface. The axis-specific feedrates are also entered in the appropriate
axisspecific interface.
When the tool management (magazine management) function is activated in the NCK, the
assignment of spindle or revolver and the loading/unloading points are entered in separate
interface DBs (DB71-73)
The triggering and parameter assignment of NCK functions is performed by means of PLC
function calls.
The following function calls are available:
● Position a linear axis or rotary axis
● Position an indexing axis
● Start a prepared asynchronous subprogram (ASUB)
● Reading/writing of NC variables
● Update magazine and tool motion
840
PLC/Mode group interface
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions