Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 61
6.2.9—CAN Communication Ports
Five CAN ports (M8 male connectors) are available for communication with Woodward Valves and other
CAN devices. A maximum of 15 Woodward valves configured for operation in the 10 ms rate group may
be used. When using redundant CPU modules and a failover occurs, each CAN port automatically
performs a failover from the SYSCON to the STANDBY CPU module.
1
2
3
4
Pin 1 – CAN Shield (AC coupled)
Pin 2 – CAN Low (blue)
Pin 3 – CAN Signal Ground (black)
Pin 4 – CAN High (white)
Figure 6-4. CAN Communication Ports (M8 male)
CAN networks must include 120 Ω terminations at each end of the trunk line. Drop cables connecting a
device to the trunk line should be as short as possible and less than 6 meters. It is recommended to
design the network to be less than 100 meters with a max cumulative drop length of less than 39 meters.
Table 6-2- CAN Network Trunk Line Specifications
Network Speed Max Trunk Length
(Thick cable)
Max Trunk Length
(Thin cable)
Max Drop
Length
Max Cumulative
Drop Length
1 Mbps 30 m 30 m 1 m 6 m
500 Kbps 100 m 100 m 6 m 39 m
250 Kbps 250 m 100 m 6 m 78 m
125 Kbps 500 m 100 m 6 m 156 m
Figure 6-5. Micronet to Valve CAN Interface
Woodward supplies M8 to M12 (5 pin standard) cables.
1
23
4
5
P1 – CAN Shield
P2 – not used
P3 – CAN Signal Ground (black)
P4 - CAN High (White)
P5 – CAN Low (Blue)
Figure 6-6. Example of Woodward supplied 5 Pin Standard Cable
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