Siemens SINUMERIK 840D Operator's Manual page 334

A
Appendix
B Terms
Messages
Metric measurement
system
Mirroring
Mode group
Mounting rail
Multipoint interface
N
Names
NC
A-334
All messages programmed in the parts program and -> alarms
recognized by the system are output on the operator panel in plain
text with the date and time and a symbol indicating the cancel
criterion. The display is divided into alarms and messages.
Standardized system of units: for lengths in millimeters (mm), meters
(m), etc.
Mirroring inverts the signs of the coordinate values of a contour with
respect to an axis. It is possible to mirror in relation to more than one
axis at a time.
At all times all of the axles/spindles are assigned to precisely one
channel. Each channel is assigned to one operating mode group.
The same -> mode is always assigned to the channels in a mode
group.
A mounting rail is used to attach the modules of an S7-300.
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.
Words in compliance with DIN 66025 are supplemented by identifiers
(names) for variables (arithmetic variables, system variables, user
variables), for subroutines, for keywords and for words with several
address letters. In terms of the block structure, these supplements
have the same significance as the words. Identifiers must be unique.
The same identifier must not be used for different objects.
Numerical Control: It incorporates all the components of the machine
tool control system: -> NCK, -> PLC, -> MMC, -> COM.
Note: CNC (Computerized Numerical Control) is a more accurate term
for the controls SINUMERIK 840D and FM-NC. MARS and Merkur
controls.
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
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03.04
 Siemens AG, 2004. All rights reserved