Siemens SINUMERIK 840Di sl Programming Manual page 539

Mode group
At any one time, all axes/spindles are assigned to just one channel. Each channel is
assigned to a mode group. The same -> mode is always assigned to the channels in a mode
group.
Multipoint interface
The multipoint interface (MPI) is a 9-pole Sub-D interface. A configurable number of devices
can be connected to a multipoint interface and then communicate with each other.
• Programming devices
• Operator control and monitoring equipment
• Further automation systems
The parameter block "Multipoint Interface MPI" of the CPU contains the -> parameters which
define the properties of the multipoint interface.
Name of identifier
The words according to DIN 66025 are supplemented by the identifiers (names) for variables
(computer variable, system variable, user variable), for subroutines, for keywords and words
with several address letters. In terms of the block format, these supplements have the same
significance as the words. Identifiers must be unique. The same identifier must not be used
for different objects.
NC
Numerical Control: NC control incorporates all the components of the of the machine tool
control system: -> NCK, -> PLC, HMI, -> COM.
Note
CNC (Computerized Numerical Control) is a more accurate term for the SINUMERIK 840D
controls. MARS and Merkur controls.
NCK
Numerical Control Kernel: Component of the NC control which executes -> parts programs
and essentially coordinates the movements on the machine tool.
NRK
Numeric Robotic Kernel (operating system of the -> NCK)
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Glossary
539