Industrial Control Buses

Industrial "Field Buses" are sub-divided into Buses depending on the capabilities they offer.
The most complex are the Control Buses: High Speed Ethernet (HSE) and ControlNet, followed by the
Field Buses: Foundation Fieldbus and Profibus,
the Device Buses: DeviceNet, Profibus DP, SDS and Interbus-S, and then the
Sensor Buses: CAN, ASI, Seriplex and LonWorks.
Control Buses are listed on this page

ARCNET Description

Attached Resource Computer NETwork "ARCNET"
[ANSI/ATA 878.1-1999] uses a token-passing protocol, with packet lengths of from 0 to 507 bytes at a data rate of 2.5 Mbps [10Mbps max].
ARCNET uses CRC-16. Depending on the topology the following cables may be used:
Coax; RG-62/u, RG-59/u[BNC], or #24 or #22 AWG solid copper twisted-pair cable [RJ-11], or fiber optic cable [SMA or ST].
ARCNET is also used with [DC or AC coupled] RS485 [which is an electrical only specification].
ATA 878.2 [1992 draft] defines the frame format

The ARCNET Trade Association (ATA) controls the specification
Note that the last release of the ARCNET standard was in 1999 [first released in 1992], so this transfer speed listed remains the top end.

ControlNet Description

Developed by Allen Bradley. ControlNet uses RG6 Coax cable, around 250 meter length at 5Mbytes rates, over dual redundant BNC connections.
ControlNet is used for Time/Mission Critical applications. Looks to be similar to Ethernet.
Based on the Common Industrial Protocol (CIP).

High Speed Ethernet

High Speed Ethernet or HSE and the "conventional" Ethernet both share the same physical and MAC levels , but use different protocols.
HSE [High Speed Ethernet] runs at 100 Mbps over standard Ethernet physical layers.

FOUNDATION Description

Uses IEC/ISA-S50.02-1992 as the standard, as does Profibus.
The physical layer (PHY) for device control is H1 which runs at 31.25kbps on a single twisted pair wire that can be run up to 1900 Meters, or HSE [High Speed Ethernet] which runs at 100 Mbps over standard Ethernet physical layers.
FOUNDATION Fieldbus provides up to 32 devices on a H1 segment running at 31.25 kps (differential).
H1 is a IEC 61158 standard, and ANSI standard. Reference;

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Industrial Ethernet Description

Industrial Ethernet and the "conventional" Ethernet both share the same physical and MAC levels , but use different protocols.
Also check High Speed Ethernet (HSE) Data / specifications for Ethernet bus on this page.

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SafetyBus Description

SafetyBus is based on the CanBus [with added redundancy] as a multi-master system with a linear bus topology and uses an open protocol.
SafetyBus is event driven, with messages being sent only when an event changes.

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WorldFIP Description

WorldFIP "Flux Information Processbus" [European Standard EN50170].
The Physical Layer: is compliant to IEC 1158-2 for all speeds [up to 2.5Mbit/sec (typically 1Mbit/sec)] on twisted pair and fiber optic.
The Physical Layer, Data Link Layer, and Application Layer are specified.

Note that a few of these industrial fieldbus standards are out-dated, or not being updated any longer.
So when looking at a new implementation choose a fieldbus that is still being up-dated, supported or worked on.
Or a Control Bus that has a number of manufacturers backing the standard.
Selecting an interface standard that is no longer active and supported may make it hard to find both component and support.
Or you could end up working with the last supplier still support the interface with no second source possibilities.

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Modified 6/13/15
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