1 About this documentation
1.3 Terminology used
8
Lenze · Controller-based Automation - Visualisation · System Manual · DMS 1.5 EN · 04/2014 · TD17
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1.3 Terminology used
Term Meaning
Controller The Industrial PC (IPC) or controller is the central component of the automation
system which controls the Logic and Motion functionalities by means of the
runtime software.
The controller communicates with the field devices via the fieldbus.
IPC
Engineering PC The Engineering PC and the Engineering tools installed serve to configure and
parameterise the system "Controller-based Automation".
The Engineering PC communicates with the controller via Ethernet.
Fieldbus node Devices integrated in the bus system as, for instance, Controller and inverter
Field device
HMI Human Machine Interface (HMI) is a synonym for MMI (Man - Machine -
Interface). The term stands for the user interface of a machine.
Via the HMI, the operator can operate the machine, monitor system states, and,
if necessary, intervene in the process. Information is either provided by means of
hardware via operator panels with signal lamps, display fields, and buttons, or,
by means of software, via a visualisation system running on a terminal.
The HMI communicates with the machine PLC via different communication
paths.
Simplified description of the exchange of information:
operator <-> HMI <-> machine
In this context, the term Supervisory Control And Data Acquisition (SCADA
) is
often used.
Inverter Generic term for Lenze frequency inverter, servo inverter
MPI The multi-point interface is used for connecting programming units, operator
panels, and other SIMATIC-S7 devices. The MPI is based on the EIA-485 standard
(formerly RS-485) and operates at a baud rate of 187.5 kbps - 12 Mbps.
The voltage supply gets the interface from the control system via the MPI line.
The interface is hardware-compatible with the Profibus interface on Siemens
control systems.
Different manufacturers offer PCI plug-in cards, PCMCIA plug-in cards, USB
adapters, or Ethernet adapters for communication via MPI. All S7 stations can be
interconnected via the MPI bus.
The MPI bus is not standardised, but a Siemens-specific bus. The multi-point
interface is a communication interface integrated in every SIMATIC®-S7
automation device (SIMATIC® S7/M7, and C7). It can be easily used for simple
networks.
OPC tunnel OPC tunnel
( 60)
PLC Programmable Logic Controller
SCADA Supervisory Control And Data Acquisition (SCADA)
• A SCADA system is a process visualisation or host system on which several
machines or lines are interconnected.
• Central alarm management, archiving of data, the creation of time control
software programs, and a messaging service (SMS, e-mail, text-to-speech)
are typical of a SCADA system.
HMI
( 8)
PLC Programmable Logic Controller (PLC)
Bus systems
CAN CAN (Controller Area Network) is an asynchronous, serial fieldbus system.
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