Texas Instruments The Future of Robotics | 29
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DP83826
10/100Mbps PHY
THVD24x0 RS-422/RS-485
Transceivers
Table 1: IO-Link versus industrial Ethernet for manufacturing field communications.
Feature IO Link Profinet EtherCAT Comment
Physical layer
<=230kbit, half duplex,
20m, power in same cable
100Mbit, full duplex,
100m, separate power
100Mbit, shared packet,
100m, power in same cable
defined
Only Profinet supports
concurrent receive
and transmit of
packets
Topology Point to point Line, ring, star Line, ring, star
Ethernet allows for
large scale networks
Min. cycle
time
400µs + 10%
250µs (31.25 ˜µs with
DFP)
31.25µs
IO-Link allows
additional tolerance
of +10%
Time
syncronization
Based on communication
start
PTCP < ± 1 µs, IRT test
<250ns
Distributed clocks
± 100ns
IO-Link has no
application time
Security Not available
Limitations of no Profinet
traffic
Not available
All need additional
security protocol for
IT connection
Functional
Safety
Only sign of live on
redundant channel
Profisafe
Funcational Safety over
EtherCAT
Ethernet transmission
is seen as black
channel
Profiles and
Services
Smart sensor, fieldbus
integration, firmware
update, OPC UA
Profidrive, CiR, system
redundancy, diagnostics
SoE, CoE, EoE, FoE, AoE,
EAP
All support
integration into
automation network,
no drive profile on
IO-Link
The growth of smart
factories depends on
versatile networking that
matches the requirements
of individual equipment
units with the overall
communication needs
of the factory.
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