CDA ci860 Specifications Page 265

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Device Management PROFIBUS & HART
3BDS011222-510 B 265
The cycle time of the OPC Server is set to a default value in the following
aspects at the Asset Optimization node in Plant Explorers Control Structure:
DIP HART Asset Monitor Data Source aspect (HART devices)
DIP PROFIBUS Asset Monitor Data Source aspect (PROFIBUS
devices)
By rule of thumb the following timings should be configured in the specific
aspect for the particular fieldbus protocol:
1800000 ms (0.5 h) = <
200 devices
7200000 ms (2.0 h) = 201 - 500 devices
9000000 ms (2.5 h) = 501 - 800 devices
10800000 ms(3.0 h) = 801 - 1000 devices.
If more devices are counted and displayed in the OPC Timing Statistics tab,
refer to the related release nodes, if more device types (incl. timings) are
supported by the OPC Server PROFIBUS/HART.
3. Select the Asset Optimization node in the Control Structure.
4. Select in Aspect Window of this node the DIP HART Asset Monitor Data
Source aspect or DIP PROFIBUS Asset Monitor Data Source aspect,
depending on the fieldbus protocol.
5. Configure OPC Group Update Rate in the displayed table according to the
rule described above.
The default cycle times mentioned below are only indicative numbers. These
cycle times need to be increased further (2 to 5 times) in situations like redundant
AO configuration, larger plant areas, distributed controllers or field devices.
If more devices are used for OPC access as released by the 800xA system, the
OPC Server must be split to sub-level nodes in the Plant Explorers Control
Structure. Follow first the instructions in System 800xA Device Management 5.1
PROFIBUS and HART Configuration (3BDD011934*) before continuing the
steps described below.
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