Emerson Process Management ControlWave EFM 3808 - Manual (Page 235)

CI-ControlWave EFM Appendix F / F- 35
F.7.1 Communication Settings
Mode – Enabled/Disabled - When this signal is ENABLED, a chromatograph is present,
and gas component data is provided by the chromatograph interface. When this signal is
DISABLED, the fixed values for the gas component data are used.
Common Fixed Data - When COMMON is selected fixed chromatograph values for all runs
will come from the Stream 1 fixed values. When INDIVIDUAL is selected, fixed
chromatograph values will come from the individual stream assigned to each run.
Port Number - When a chromatograph is present, this is the port number on the Control-
Wave EFM that the chromatograph is connected to. The Default Port in the load is Port 4.
Note: This functionality requires that an Expansion Communications Module is
installed.
MODBUS Address - When a chromatograph is present, this is the MODBUS Address (1-
246) of the chromatograph.
F.7.2 Stream Assignment and Setup
The Daniel 2251 can provide gas properties for up to 4 individual streams. The standard
application program allows the user to assign any stream to any meter run (up to four
streams and four runs). Each meter run may be assigned to the same stream, or each may
be assigned to a different stream.
In the event of a chromatograph failure, the user may assign either fixed values to use for
each gas component, or the last good values retrieved from the chromatograph. This mode
is selectable on a per stream basis.
F.7.3 Analysis Data
The Raw values of BTU and Specific Gravity from the Chromatograph will be displayed for
each stream. Fixed values for BTU and Specific Gravity may be entered for each stream.
F.7.4 Gas Components
The Raw value of each gas component from the chromatograph will be displayed for each
stream. Fixed values for each gas component may be entered for each stream
F.7.5 Chromatograph Component Range Setup
Values of BTU, Specific Gravity and each gas component of each stream are compared to
user configured (high and low) allowable limits. These limits are set from the
Chromatograph Component Range Setup Web Page, accessible from the Chromatograph
Setup Web Page. If a component is found to be outside the user defined limits, the value
will be clamped at the closest configured limit.
It also checks the sum of the components; if the sum is outside the configurable limits, a
Boolean signal is set indicating so. If any component or the total is out of range, either fixed
or last values will be used.