Operation and communication
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7
Operation and communication
7.1
Communication via PROFINET
7.1.1
General Information on Communication via PROFINET
PROFINET is an open standard for industrial automation based on industrial Ethernet. PROF-
INET integrates information technology with established standards such as TCP/IP and XML in
automation technology.
Within PROFINET, PROFINET IO is the communication concept for the construction of decen-
tralized applications. This means that decentralized field devices are integrated through PROF-
INET IO. The familiar IO view of PROFIBUS DP is used where the usable data of the field
devices is transferred to the controller process image in cycles. PROFINET IO is a device
model consisting of slots and channels, which is based on the main features of PROFIBUS DP.
The field device properties are written in a Generic Station Description Markup Language
(GSDML) based on XML. PROFINET IO is engineered in the same way as has long been the
case for system integrators of PROFIBUS DP. The decentralized field devices are assigned in
the design of a controller.
PROFINET IO distinguishes between the following three device types:
•
IO controller: Controller that executes the automation program.
•
IO device: Decentrally assigned field device that is assigned to an IO controller.
•
IO supervisor: Programming unit/PC with commissioning and diagnostic functions.
7.1.2
PROFINET I/O Interface
The reader functions as a PROFINET I/O device that communicates cyclically with the
assigned PROFINET I/O controller during operation.
The PROFINET interface of the reader supports the following features:
•
100 Mbits/s transfer rate
•
Real-time category (RT)
•
The range of functions in accordance with
Conformance Class B
•
Identification and maintenance functions (I&M) IM0 ... IM4
