CJ1W-PNT21 Omron, CJ1W-PNT21 Datasheet - Page 34

• Manufacturer Part Number: CJ1W-PNT21
• Description: CJ Profinet Master
• Manufacturer: Omron

Specifications of CJ1W-PNT21

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Setting up the PROFINET IO network
3-4
3-4-1
3-4-1-1 Line
Setting up the PROFINET IO network
Network structure
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:
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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:
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Disadvantages of the line topology:
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•
Part
Switch (optional)
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.
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.
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 network.
/i
Switch
Recommendation
Industrial Ethernet Switch (either managed or unmanaged).
Figure 3.8: Ethernet line topology
Section 3-4
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