Emerson NGA2000 Reference Manual page 129

NGA2000 Reference
ALVAR
Direction
Binding
Type
Value range
Units
Description
Usage
See also
AM_ALARM
Direction
Binding
Type
Value range
Units
Description
Usage
See also
AMFAIL
Direction
Binding
Type
Value range
Units
Description
Usage
See also
Rosemount Analytical Inc. A Division of Emerson Process Management
output
None
3-element enumerated array
VALIDITY; AM Warning; AM Failure; Sys. Failure; Control Status; Concentration;
Analyzer alarm 1; Analyzer alarm 2; Analyzer alarm 3; Analyzer alarm 4; Analyzer
alarm 5; Analyzer alarm 6; Analyzer alarm 7; Analyzer alarm 8; Analyzer alarm 9;
Analyzer alarm 10.
None
AIO only; determines the functionality of each relay.
VALIDITY makes the relay respond to the VALIDITY variable, it will alarm if
VALIDITY becomes anything greater than 0; AM Warning makes the relay respond
to the GENERALSTATE variable, it will alarm if GENTERALSTATE is equal to
"WARNING" (1); AM Failure makes the relay respond to the GENERALSTATE
variable, it will alarm if GENERALSTATE is equal to "FAILURE" or "SAFETY
FAELLTRE" (2 or 3); Sys. Failure makes the relay respond to SYSTEMSTATE, it
will alarm if SYSTEMSTATE becomes greater than 0; Control Status makes the
relay respond to the CONTROL variable, it will change state if CONTROL changes
between the values of 0 or 2, and I - i.e. it responds to remote versus local or
automatic control; Concentration makes the relay respond to the value of PVA, the
gas concentration, as determined by the concentration variables such as ALLVL,
ALTYPE etc.; Analyzer alarm I etc. Are not used in version 2.2.
ALLVL
ALTYPE
Input
None
10-element enumerated array
OFF; ON
None
An array of alarm reporting elements.
Analyzers supporting this feature can generate specific alarms that are assigned to
various elements of this array. If enabled through ALVAR, the 1/0 will cause its
appropriate relay to respond to any of these. No 2.2 analyzer supports this feature.
ALVAR
output
None
Enumerated
ZERO; FULLSCALE; LAST VALUE
None
AIO, ACAL only; describes what the analog output will do if the PVA is not updated
for more than 10 seconds.
If the analyzer dies, or for some reason the PVA variable is not updated, the
analog output may be forced to zero (or 4 mA), to full scale (5V or 20mA), or to
hold at its last value. This should be chosen based on the results of such a failure.
Reference Manual
748384-C
September 2003
I/O Modules Variables 3-3