3.2.1
IONet Specifications
IONets are IEEE 802.3 100 Megabits full duplex Ethernet networks. All traffic on each IONet is deterministic UDP/IP based
packets. Each network (red, blue, black) is an independent IP subnet. The IEEE 1588 standard for precision clock
synchronization protocol is used to synchronize frame and time between the controllers, and the I/O modules on the IONet.
This synchronization provides a high level of traffic flow control on the networks.
The following figure display maximum IONet cable lengths.
100 FX Fiber
Multi mode (MMF): 2000 m (6600 ft)
Single mode (SMF): 15 km (9.32 miles)
Controller
Cat 5 e (copper)
100 m (328 ft)
Cat 5e (copper )
100 m (328 ft)
Copper or Fiber depending
on distance required
field wiring
Field device
Cat 5 e (copper)
100 m (328 ft)
IONet Maximum Distances
Item
IONet Specification
IEEE specification
802.3u
Wire speed
100 Mbps
Cable types
100Base-TX: UTP Cat 5e
100Base-FX: MMF or SMF
Maximum taps per segment
2
Maximum packets per network
199
Maximum number of switches
5
Topology
Star
For the control system IONet topologies, the following rules apply for deploying SMF systems:
•
No more than five switches can be placed in series between controller and remote I/O module.
•
The topology should be kept as flat and balanced as possible (star topology).
•
Use the GE ESWA or ESWB switch with additional IR
single-mode transceiver for SFP1 and SFP2.
−
GE part # 65G2100-009 for single-mode fiber distances up to 2 km
−
GE part # 65G2100-008 for single-mode fiber distances up to 15 km
Caution
Use of any other switch in this application may cause miss operation and/or damage to
the associated equipment.
Ethernet Networks
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