8. How easyE4 works internally
8.4 NET network
Bus Delay
The bus delay defines the delay that a station on the NET will use when sending its
data to other stations.
This bus delay must be adjusted in line with the number of stations and the values
being transmitted. If it is too short, there will be data collisions and the Ethernet will
be limited to transmitting NET communications exclusively.
The value range for the bus delay is 10 ms to 255 ms.
The following rule of thumb applies:
l
Case A: When using PUT/GET and network markers:
l
Bus delay in ms = (number of NET stations - 1) * 4 * 2 + 6
l
Case B: If only network markers are being used:
l
Bus delay in ms = (number of NET stations - 1) * 2 * 2 + 6
The following table can be used as a convenient guide for configuring the setting:
Number of modules:  Delay with put/get  Delay without put/get
  ms  ms
2

14

10
3

22

14
4

30

18
5

38

22
6

46

26
7

54

30
8

62

34
If you are no longer able to connect to the NET stations via
Ethernet with easySoft 8, set the bus delay as high as possible
for your application. To do this, you will need to disconnect
each device from the Ethernet and use easySoft 8 to change
the bus delay point by point.
656
easyE402/24 MN050009ENEaton.com
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