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TABLE 37.2<br />

Features of Major Industrial Ethernet Solutions<br />

Type<br />

(cf. Section<br />

37.2.3)<br />

Real-Time<br />

Capability Standards Compliance Determinism QoS Transmission Time Application Domain<br />

EtherCAT 4 Hard real-time 61158 Ethernet cables Deterministic with<br />

short cycle time<br />

EtherNet/IP 1 Soft real-time 61158 IEEE802.3 TCP/<br />

IP (RFC791 and 793)<br />

FF HSE 1 Soft real-time 61158 IEEE802.3 TCP/<br />

IP (RFC791 and 793)<br />

Modbus/TCP 1 Soft real-time 61158 IEEE802.3 TCP/<br />

IP (RFC791 and 793)<br />

EPL 3 Soft real-time or<br />

hard real-time<br />

61158 IEEE802.3 TCP/<br />

IP (RFC791 and 793)<br />

Nondeterministic<br />

Ensured thanks to the<br />

transfer of all data in<br />

a unique frame<br />

Use of 802.1Q and<br />

802.1D standards<br />

Nondeterministic Possible use of 802.1Q<br />

and 802.1D standards<br />

Typically around 100.μs<br />

No guarantee offered by<br />

the protocol if not<br />

using CIPSync<br />

No guarantee offered by<br />

the protocol ∼100.ms<br />

Nondeterministic No QoS No guarantee offered by<br />

the protocol<br />

Deterministic with<br />

short cycle time<br />

QoS ensure by use of<br />

TDMA mechanism<br />

ProfiNet RT 1 Soft real-time 61158 IEEE802.3 Nondeterministic Prioritization of flows,<br />

limitation of broadcast,<br />

and use of VLANs<br />

IRT 2 Hard real-time 61158 IEEE802.3 Deterministic for<br />

IRT flows<br />

SERCOS III 4 Hard real-time 61158 Ethernet links Deterministic with<br />

short cycle time<br />

Flow prioritization<br />

inside the switch<br />

Ensured thanks to the<br />

transfer of all data in a<br />

unique frame<br />

Guaranteed (values<br />

depend on devices: hub<br />

or switch)<br />

No guarantee offered by<br />

the protocol<br />

Guaranteed for IRT flows<br />

thanks to time slot<br />

managed by switches<br />

Typically around 100.μs<br />

Motion control<br />

Process, batch,<br />

manufacturing<br />

Process<br />

Manufacturing<br />

Motion control<br />

Electricity<br />

production (fossil<br />

fuel, hydraulic)<br />

ProfiNet<br />

Motion control<br />

37-8 Industrial Communication Systems<br />

© <strong>2011</strong> by Taylor and Francis Group, LLC

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