Instruction Manual

4-2
- IV Series User’s Manual (Field Network) -
Overview of PROFINET
Overview of PROFINET
What is PROFINET?
PROFINET is an open industrial networking standard developed and maintained by the PI (PROFINET
International).
All supported devices can use the communication network regardless of the vendor.
PROFINET allows easy integration with the currently used eld bus (such as PROFIBUS), enabling you to
protect the existing assets without modifying the legacy system.
The following two types of communication standards exist for the PROFINET communication: PROFINET
CBA communication for data communications between processes and between I/O controllers, and
PROFINET I/O communication for data communications between the I/O controller and I/O device.
The PROFINET communication for the IV series supports the PROFINET I/O communication and complies
with Conformance Class A.
The PROFINET I/O communication offers the following two types of communication methods for cyclic
data: Real-time communication (RT) and isochronous real-time communication (IRT).
Real-time communication provides similar communication performance as the existing eld bus, such as
the device control in normal factory automation, using Ethernet. The isochronous real-time communication
is capable of meeting stringent real-time requirements, including synchronized motion control.
The real-time communications offer the following two types of communications: Data I/O communication
for sending and receiving data periodically, and record data communication for sending and receiving
commands/responses at arbitrary timings. In the data I/O communication, you can set the SendCycle
(Communication cycle) based on the priority of the data to be sent/received, enabling sending/receiving of
data with adjusted overall communication load. The record data communication is used for communication
applications that require little punctuality (unlike the data I/O communication).
The IV series supports the data I/O communication provided by the real-time communications (RT).
PROFINET
communication
I/O controller
Normal
(Communication
cycle: 64
*
ms)
High-speed
(Communication cycle:
4* ms)
Low-speed (Communication cycle: 512
*
ms)
PROFINET
communication
I/O device
PROFINET
communication
I/O device
PROFINET
communication
I/O device
* If you congure the setting to "auto", the overall communication load will be adjusted and the
SendCycle (Communication cycle) will be set automatically.
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PROFINET