ABB IRC5 Compact, Applications Manual

Page: 26 / 88

2.2 Ethernet switches
Prerequisites
It is recommended that switches used in the I/O network support Quality of Service
(QoS).
I/O devices mark their packets with a priority value. The priority value is used in
order to get better I/O data throughput and shorter delays on the network.
Switches and routers are then able to differentiate the device's critical from the
other non-critical traffic. To do this, the switches and routers must support Quality
of Service.
26 Application manual - PROFINET Controller/Device
3HAC050969-001 Revision: G
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2 Hardware overview
2.2 Ethernet switches