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PHYSICAL CHARACTERISTICS
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
Modbus Plus Multidrop Network segment with bridge capibilitites RS485, Transformer isolated 32, 64 max. pcr segment with bridge capibilitites 1500 feet (450 meters) repeater CAN extend to 6000 ft (1800m)
Industrial Ethernet STAR, BUS LOBASE-T, 10-Base-FL (FIBER) 100 Base TX 48 bit address
TRANSPORT MECHANISM
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
Modbus Plus Token Passing 1 MBPS 256 bytes data + header peer to peer, token passing 16-bit CRC Local Chip and Software
Industrial Ethernet CSMA/CD 10MBPs, 100 MBPs 1500 Bytes Data. Collision Detection 32 bit CRC. CD, Network Management
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
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
Modbus Plus Multidrop Network segment with bridge capibilitites RS485, Transformer isolated 32, 64 max. pcr segment with bridge capibilitites 1500 feet (450 meters) repeater CAN extend to 6000 ft (1800m)
Industrial Ethernet STAR, BUS LOBASE-T, 10-Base-FL (FIBER) 100 Base TX 48 bit address
TRANSPORT MECHANISM
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
Modbus Plus Token Passing 1 MBPS 256 bytes data + header peer to peer, token passing 16-bit CRC Local Chip and Software
Industrial Ethernet CSMA/CD 10MBPs, 100 MBPs 1500 Bytes Data. Collision Detection 32 bit CRC. CD, Network Management
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