8
Reference Manual
00809-0100-4772, Rev FA
Configuration and Operation
March 2016
Configuration and Operation
Permitted modes
It is possible to prevent unauthorized changes to the operating mode of a block. To do this,
configure MODE_BLOCK.PERMITTED to allow only the desired operating modes. It is
recommended to always select OOS as one of the permitted modes.
2.5.2 Block instantiation
The Rosemount 8800D Device Revision 10 supports block instantiation. Previous device
revisions do not support block instantiation. When a device supports block instantiation,
the number of blocks and block types can be defined to match specific application needs.
The number of blocks that can be instantiated is only limited by the amount of memory
within the device and the block types that are supported by the device. Instantiation does
not apply to standard device blocks like the Resource, Sensor Transducer, Analog Input, and
PID Blocks.
By reading the parameter “FREE_SPACE” in the Resource Block you can determine how
many blocks you can instantiate. Each block that you instantiate takes up 4.5573% of the
“FREE_SPACE”.
Block instantiation is done by the host control system or configuration tool, but not all hosts
are required to implement this functionality. Refer to your specific host or configuration
tool manual for more information.
2.6 Resource Block
The Resource Block contains diagnostic, hardware and electronics information. There are
no linkable inputs or outputs to the Resource Block.
2.6.1 FEATURES and FEATURES_SEL
The FEATURES parameter is read only and defines which features are supported by the
flowmeter. Below is a list of the FEATURES the flowmeter supports.
FEATURES_SEL is used to turn on any of the supported features that are found in the
FEATURES parameter. The default setting of the flowmeter does not select any of these
features. Choose one or more of the supported features if any.
UNICODE
All configurable string variables in the flow meter, except tag names, are octet strings.
Either ASCII or Unicode may be used. If the configuration device is generating Unicode octet
strings, you must set the Unicode option bit.
REPORTS
The flow meter supports alert reports. The Reports option bit must be set in the features bit
string to use this feature. If it is not set, the host must poll for alerts. If this bit is set, the
transmitter will actively report alerts.
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