Siemens SIMATIC IPC647D Operating Instructions Manual page 208

Glossary
Interface
● Physical interconnection (cable) of hardware elements such as PLCs, PCs, programming
devices, printers or monitors.
● Interface for interactive software applications.
Interface, multi-point
MPI is the programming interface of SIMATIC S7/M7. Allows remote access to
programmable modules, text-based displays and OPs from central locations. The MPI nodes
can intercommunicate.
LAN
Local Area Network: LAN is a local network that consists of a group of computers and other
devices that are distributed across a relatively restricted range and are linked with
communication cables. The devices connected to a LAN are called nodes. The purpose of
networks is the mutual use of files, printers or other resources.
Legacy Boot Device
Conventional drives can be used as USB devices.
Legacy USB support
Support of USB devices (e.g. mouse, keyboard) on the USB ports without driver.
License key
The license key represents the electronic license stamp of a license. Siemens provides the
license keys for protected software.
License key disk
The license key disk contains the authorizations or license keys required to enable protected
SIMATIC software.
Low-voltage directive
EC Product Safety Directive relating to the safety of products which are operated on low
voltage (50 V AC to 1000 V AC, 70 V DC to 1500 V DC) and not specified in other directives.
Compliance is confirmed by the CE symbol and the EC certificate of conformity.
LPT interface
The LPT interface (Centronics interface) is a parallel interface that can be used to connect a
printer.
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Operating Instructions, 01/2014, A5E32996306-AA
SIMATIC IPC647D