Siemens SINUMERIK 840D sl Programming Manual page 658

Glossary
Main block
A block prefixed by ":" containing all the parameters required to start execution of a -> parts
program.
Main program
Parts program identified by a number or identifier in which further main programs,
subroutines or -> cycles may be called.
Mains
The term "network" describes the connection of several S7-300 and other terminal devices,
e.g. a programming device, via -> interconnecting cables. A data exchange takes place over
the network between the connected devices.
MDI
Control operating mode: Manual Data Automatic. In MDA mode, it is possible to enter
individual program blocks or sequences of blocks without reference to a main program or
subroutine and to then execute them immediately via the NC start key.
Messages
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.
Metric system
Standardized measuring system: for lengths in millimeters (mm), meters (m), etc.
Mirroring
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.
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
Glossary-12
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
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