BACKGROUND INFORMATION |
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| Technology Developer | Year Introduced | Governing Standard | Openness | |
| PROFIBUS DP/PA | PTO | DP-1994, PA-1995 | DIN 19245 part 3/4 | Products from over 150 vendors |
| INTERBUS-S | Phoenix Contact | 1984 | DIN 19258 | Products from over
400 manufacturers |
| DeviceNet | Allen-Bradley | March 1994 | ISO 11898 &11519 | 6 chip vendors,
100+ products |
| ARCNET | Datapoint/ SMC | 1975 | ANSI 878 | Chips, boards, ANSI docs |
| AS-I | AS-I Consortium | Fall 1993 | Submitted to IEC | AS-II.C. Market item |
| Fieldbus Foundation | Fieldbus Foundation | 1995 | ISA SP50/IEC TC65 | Chips/software from multiple vendors |
| IEC/ISA SP50
Fieldbus |
ISA & Fieldbus F. | 1992 - 1996 | IEC 1158/ANSI 850 | Multiple chip vendors |
| Seriplex | APC, Inc. | 1990 | Seriplex spec | Chips available multiple interfaces |
| WorldFIP | WorldFIP | 1988 | IEC 1158-2 | Multiple chip vendors |
| LonWorks | Echolon Corp. | March 1991 | ASHRAE of BACnet | Public documentation on protocol |
| SDS | Honeywell | Jan., 1994 | Honeywell Specification, Submitted to IEC, ISO11989 | 6 chip vendors,
200+ products |
PHYSICAL CHARACTERISTICS |
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| Network Topology | Physical Media | Max. Devices (nodes) | Max. Distance | |
| PROFIBUS DP/PA | Line, star & ring | Twisted-pair or fiber | 127 nodes | 24 Km (fiber) |
| INTERBUS-S | Segmented with "T" drops | Twisted-pair, fiber, and slip-ring | 256 nodes | 400 m/segment, 12.8 Km total |
| DeviceNet | Trunkline/dropline with branching | Twisted-pair for signal & power | 64 nodes | 500m |
| ARCNET | Bus, multidrop, star | Twisted-pair coax fiber | 255 nodes | 5 miles |
| AS-I | Bus, ring, tree star, of al | Two wire cable | 31 slaves | 100 meters, 300 with repeater |
| Fieldbus Foundation | Multidrop with bus powered devices | Twisted-pair | 240/segment, 65,000 segments | 1900m @ 31.25K
500m @ 2.5M |
| IEC/ISA SP50
Fieldbus |
Star or bus | Twisted-pair fiber, and radio | IS 3-7
non IS 128 |
1700m @ 31.25K
500M @ 5Mbps |
| Seriplex | Tree, loop, ring, multi-drop, star | 4-wire shrolded cable | 500+ devices | 500+ ft |
| WorldFIP | Bus | Twisted-pair, fiber | 256 nodes | up to 40 Km |
| LonWorks
|
Bus, ring, loop, star | Twisted-pair, fiber, power line | 32,000/domain | 2000m @ 78 kbps |
| SDS
|
Trunkline/Dropline | Twisted-pair for signal & power | 64 nodes,
126 addresses |
500m |
TRANSPORT MECHANISM |
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| Communication Methods | Transmission Properties | Data Transfer Size | Arbitration Method | Error Checking | Diagnostics | |
| PROFIBUS DP/PA | Master/slave
peer to peer |
DP up to 12 Mbps
PA 31.25 kbps |
244 bytes | Token passing | HD4 CRC | Station, module & channel diagnostics |
| INTERBUS-S | Master/slave with total frame transfer | 500kBits/s,
full duplex |
512 bytes h.s.,
unlimited block |
None | 16-bit CRC | Segment location of CRC error and cable break |
| DeviceNet | Master/slave, multi-master, others | 500 kbps,
250 kbps, 125 kbps |
8-byte variable message | Carrier-Sonac Multiple Access | CRC check | Bus monitoring |
| ARCNET | Peer to peer | 31.25K to 10M | 508 bytes | Token | 16-bit CRC | Built in |
| AS-I | Master/slave with cyclic polling | Data and power, EMI resistant | 31 slaves with 4 in and 4 out | Master/slave with cyclic polling | Manchester Code, hamming-2, partly | Slave fault, device fault |
| Fieldbus Foundation | Client/server publisher/ subscriber, Event notification | 31.25 kbps 1 Mbps 2.5Mbps | 16.6 M objects/device | Deterministic centralized scheduler, multiple backup | 16-bit CRC | Remote diagnostics, network monitors, parameter status |
| IEC/ISA SP50
Fieldbus |
Client/server Publisher/ subscriber | 31.25 kbps IS+1, 2.6, 5 Mbps | 64 octets high & 256 low priority | Scheduler, tokens, or master | 16-bit CRC | Configurable on network management |
| Seriplex | Master/slave
peer to peer |
200 Mbps | 7680/transfer | Sonal multiplexing | End of frame & echo check | Cabling problems |
| WorldFIP | Peer to peer | 31.25 kbps, 1 & 2.5 Mbps, 6 Mbps fiber | No limit, variables 128 bytes | Central arbitration | 16-bit CRC, data "freshness" indicator | Device message time-out, redundant cabling |
| LonWorks | Master/slave
peer to peer |
1.25 Mbs full duplex | 228 bytes | Carrier Sense, Multiple Access | 16-bit CRC | Database of CRC errors and device errors |
| SDS | Master/slave,
peer to peer, multi-cast, multi-master |
1Mbps,
500 kbps, 250 kbps, 125 kbps |
8-byte variable message | Carrier-Sonac Multiple Access | CRC check | Bus monitoring,
Diagnostic slave |
| PERFORMANCE | |||
| Cycle Time: 256 Discrete
16 nodes with 16 I/Os |
Cycle Time: 128 Analog
16 nodes with 8 I/Os |
Block transfer of 128 bytes
1 node |
|
| PROFIBUS DP/PA | Configuration dependent
typ <2ms |
Configuration dependent
typ <2ms |
not available |
| INTERBUS-S | 1.8 ms | 7.4 ms | 140 ms |
| DeviceNet | 2.0 ms Master-slave polling | 10 ms Master-slave polling | 4.2 ms |
| ARCNET | <2 ms @ 2.5M | <2 ms @ 2.5M | <2 ms @ 2.5M |
| AS-I | 4.7 ms | not possible | not possible |
| Fieldbus Foundation | 100 ms @ 31.25k
<1 ms @ 2.5M |
600 ms @ 31.25k
<8 ms @ 2.5M |
36 ms @ 31.25k
0.45 ms @ 2.5M |
| IEC/ISA SP50 | Configuration dependent | Configuration dependent | 0.2 ms @ 5 Mbps
1.0 ms @ 1 Mbps |
| Seriplex | 1.32 ms @ 200 kbps, m/s | 10.4 ms | 10.4 ms |
| WorldFIP | 2 ms @ 1 Mbps | 5 ms @ 1 Mbps | 5 ms @ 1 Mbps |
| LonWorks | 20 ms | 5 ms @ 1 Mbps | 5 ms @ 1 Mbps |
| SDS | <1 ms, event driven | <1 ms per event | 2 ms @ 1 Mbps |