Reference Manual
00809-X0100-4793, Rev CA
August 2004
4-3
Rosemount 8742C
AI BLOCK
The Analog Input (AI) function block provides the primary interface of the
measurement to the control and/or monitoring systems. To properly configure
the device, three parameters must be set in order to correctly interface
between the AI block and transducer block.
1.
The CHANNEL parameter defines which transducer block
measurement is used by the AI block. In the 8742C Magnetic
Flowmeter Transmitter, only one channel is available: AI1.CHANNEL
= 1 (Flow).
2.
The second parameter is the XD_SCALE.UNITS_INDX. The default
configuration is feet per second (ft/s). Other units are available and
listed in Appendix D: Table D-3.
3.
Finally, since the flow measurement from the transducer block is in
the correct units, L_TYPE is configured as Direct. L_TYPE can be
either Direct or Indirect.
NOTE
Refer to the F
OUNDATION
fieldbus Block product manual, document
00809-0100-4783, for more details on configuring and troubleshooting the AI
Block.
ARITHMETIC BLOCK
The Arithmetic function block provides the ability to configure a range
extension function for a primary input and applies the nine (9) different
arithmetic types as compensation to or augmentation of the range extended
input. All operations are selected by parameter and input connection.
The nine (9) arithmetic functions are Flow Compensation Linear, Flow
Compensation Square Root, Flow Compensation Approximate, Btu Flow,
Traditional Multiply and Divide, Average, Summer, Fourth Order Polynomial,
and Simple HTG Compensate Level.
This Arithmetic function block supports mode control (Auto, Manual, and Out
of service). There is no standard alarm detection in this block.
NOTE
Refer to the F
OUNDATION
fieldbus Block product manual, document
00809-0100-4783, for more details on configuring and troubleshooting the
Arithmetic Block.
INTEGRATOR
The Integrator (INT) function block integrates one or two variables over time.
The block compares the integrated or accumulated value to pre-trip and trip
limits and generates discrete output signals when the limits are reached.
The Integrator function block supports mode control, demand reset, a reset
counter, and signal status calculation. There is no process alarm detection in
the block.
NOTE
Refer to the F
OUNDATION
fieldbus Block product manual, document
00809-0100-4783, for more details on configuring and troubleshooting the
Integrator Block.
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