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2014-
02
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Commands
Some restrictions apply to assembly instances 107d/157d and 111d/161d:
The control interface does not support fragmentation protocols. It is, therefore, not possible to
send or receive more than 114 words simultaneously. The whole data set must be divided into
two separate PCC commands because instances 107d/157d and 111d/161d use more than
114 registers.
Example of reading/writing operations involving more than 114 registers:
First command:
Second command:
Third command:
Fourth command:
7.5
Communication via PROFINET
7.5.1
General information on communication via PROFINET
PROFINET is an open standard for industrial automation based on industrial Ethernet.
PROFINET integrates information technology with established standards such as TCP/IP and
XML into automation technology.
The communication concept for setting up decentralized applications within PROFINET is
PROFINET IO, i.e. decentralized field devices are installed by PROFINET IO. The familiar IO
view of PROFIBUS DP is used where the usable data of the field devices is cyclically
transferred to the controller process image. 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 described in GSDML (General Station Description Markup Language) in XML
format. PROFINET IO is engineered in the same way as system integrators from PROFIBUS
DP have been for years. Here, the decentralized field devices are assigned in the settings of a
controller.
PROFINET IO draws a distinction between three device types: IO controller, IO device, and IO
supervisor:
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 function.
Message type
Start register
Number of registers
Write PLC5 type
N14:0
60
Message type
Start register
Number of registers
Write PLC5 type
N14:60
64 (128 bytes / 2)
Message type
Start register
Number of registers
Read PLC5 type
N7:0
60
Message type
Start register
Number of registers
Read PLC5 type
N7:60
64 (128 bytes / 2)