990XCP98000 SQUARE D, 990XCP98000 Datasheet - Page 250

• Manufacturer Part Number: 990XCP98000
• Description: QUANTUM CPU BATTERY FOR S
• Manufacturer: SQUARE D

Specifications of 990XCP98000

• Rohs Compliant: YES
• Battery Capacity: 1800mAh
• Battery Technology: Lithium
• Battery Voltage: 3V
• Battery Terminals: Connector
• Weight: 0.12lb

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Performance
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(continued)
Modicon
automation platform
System approach
Ethernet TCP/IP network performance
To evaluate the bandwidth used by the Global Data service, it is necessary to have a list of
the variables belonging to the same multicast group, and their parameters:
1
2
3
These parameters must be collected at each station publishing at least one variable in the
multicast group.
The Global Data service network load in bps can be evaluated using the following formula:
(Size of variable x 2 + 90) x (1000/(period of Mast task x distribution period))
This calculation must be performed for variables in the multicast groups.
The previous evaluations give indications of traffic when considering:
b
b
The final objective is to obtain an evaluation of the traffic when connecting several stations.
The following information is required for each station:
b
Data services), calculated previously
b
Additional information is required for Global Data traffic:
b
b
The first step in evaluating the system consists of calculating the traffic in each
collision domain. A collision domain is a domain where a hub (concentrator)
is used.
A hub can be used to separate two domains. If only a switched or daisy-chained
network infrastructure is used (it is strongly recommended to limit the network load
as much as possible), go directly to the next step.
If you are using hubs, calculate the total traffic for all the stations connected to the
same collision domain. The table below makes this calculation easier.
Messages sent per
second to
Total number of messages
transmitted per station
The second step consists of evaluating the traffic between the collision domains. If
only a switched or daisy-chained network infrastructure is used (avoid using 2 hubs),
it is only necessary to add the messages transmitted on each link. If hubs are used at
another place in the application, add only the traffic from one hub domain to the other
(for example, via a switch) during this step.
Evaluating the network load
Global Data service
System evaluation
Messages transmitted per bps from
One station when sending I/O Scanning requests or messages
A group of stations belonging to the same Global Data group
Level of traffic the station has to manage (sum of I/O Scanning, messaging and Global
Collision domain to which the station belongs
Level of traffic in each Global Data group, calculated previously
List of stations belonging to the Global Data groups
Distribution period
Period of Mast Task
Size of variable
Station A
Station B
Station N
Not applicable
®
Quantum
Station A Station B Station N
E1
(continued)
E2
in number of scans
in ms
in number of words
™
Ei
Total number of messages
received per station
R1
R2
Ri
Network load
Cru = S [R1…Ri, E1…Ei]