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2 Nomenclature and Installation
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CJ-series PROFINET IO Controller Unit Operation Manual for NJ-series CPU Unit (W511)
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Network Installation
A PROFINET IO network can be setup as a line, star, tree or ring network. When using the CJ1W-
PNT21 unit in any of these networks, the following precautions apply:
•
Always be aware that any additional Ethernet communication through the PROFINET network
may influence the PROFINET IO Communication.
•
It is recommended to physically separate the PROFINET IO network from other Ethernet-based
communication networks (e.g. IT infrastructure) to assure reliable I/O data exchange.
•
Severely overloading the CJ1W-PNT21 with data traffic may cause the Unit to temporarily block
the Ethernet port, interrupting all traffic including PROFINET IO communication.
A line topology comprises multiple IO Devices connected in series. Many IO Devices, such as the
Omron GRT1-PNT IO Device Unit have an Ethernet switch integrated in the Unit offering an easy way
to interconnect all Devices.
Advantages of the Line Topology
•
In most control systems, the line topology requires the lowest cabling effort.
•
A line topology resembles a traditional field bus structure (comparable e.g. to PROFIBUS-DP).
•
A basic system can be built without additional Ethernet switches.
Disadvantages of the Line Topology
•
Communication paths through many switches affect transmission times.
•
A malfunction or power disruption of a single device will result in disconnection of part of the net-
work.
Additional Information
The switch shown above (optional) should be of an Industrial Ethernet Switch type (either man-
aged or unmanaged)
Line Network
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Страница 198: ...Index 1 CJ series PROFIBUS Master Unit Operation Manual for NJ series CPU Unit W509 I Index ...