General
Network cycle time: mono task application
Introduction
Calculation of the network cycle time
The network cycle time for a mono task application is calculated for the following configuration: z z the length of the bus is 1 Km, the values corresponding to the reversal and silence times and the bandwidths are default values (automatic mode).
For an application which has all the devices configured in the same task, the value of the network cycle time of the task, in milliseconds, is obtained, for information purposes only, by the following formula:
TCR_TASK= 1,45 +
Σ(
K x number of equipments of the same family)
Value of coefficient K
Coefficient K will be defined as follows:
1,5
1,5
0,6
1,5
0,4
0,6
1,5
0,6
0,6
0,6
0,6
Coefficient K
0,5
0,9
0,4
Family
TBX
TBX
Momentum
Momentum
ATV-16
ATV-58
CCX 17
CCX 17-32
TSX 37/57
AS-i gateway
Magelis
STD_P
STD_P
STD_P
Device
Discrete
Analog
Discrete
Analog
All
All
All
All
All
TSX SAP 10
All
FRD
FSP
FED
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Example The configuration of the example is as follows: z z
All the elements are configured in the MAST task in the application.
The configuration comprises: z 10 discrete TBXs, z z
11 analog TBXs,
12 discrete Momentums.
The calculation of the cycle time for the Mast task is as follows:
TCR_MAST = 1.45 + ((0.5 x 10) + (0.9 x 11) + (0.4 x 12)) = 21.15 ms
The network cycle time is about 21 ms.
General
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