Specifications

Functional Tasks, Continued
The Analysis Cycle Clock is another clock that provides the time base for
all events associated with the actual chromatograph analysis cycle. The
cycle clock is maintained by the EMSNE software and can be configured
to provide timed event resolutions of 0.1 second, 0.01 second, 0.01
minute, or 0.001 minute. This is the Embedded SNE Event Table Scan
Rate, which is independent of detector scan rates. A unique cycle clock
exists for each method configured in the analyzer database. All cycle
clocks must be of the same second or minute time units.
Cycle Clock
The cycle clock is mirrored by a cycle clock in the CIM control software.
This mirror is used in displaying results status to a user. For example,
the status timer at the top of the CIM display indicates whether the
current application is in Run status as well as the value of the cycle
clock. It is important to note that depending on processor load, this clock
may appear to be slightly out of sync with the EMSNE cycle clock. It may
appear to pause at times and run fast at other times. This does not affect
the actual cycle clock of the EMSNE software or the ongoing analysis.
The EMSNE cycle clock is used to schedule the following events.
• Analysis valve timing
• Detector balances
• Temperature set points start
and stop for PTGC
• Cycle Reset
• Pressure set point timing for
pressure programming
• Analysis result calculations
and reporting
Scheduled solenoid valve events cause Solenoid Valve Control Module
(SVCM) hardware to be activated within 5 milliseconds of stated cycle
time. Any scheduled pressure set point adjustments are transferred to
the actual Electronic Pressure Control (EPC) hardware within 5
milliseconds.
Important
Manually controlled functions can be initiated through the CIM touch
screen display panel. A manual controlled event can occur
asynchronously with any event and control some of the analyzer
operations. Controlled items include:
Manual Operations
• Activation of solenoid valves
• Balancing detectors
• Changing a pressure or temperature set point
• Initiating a calculation
• Report logging event
• Change the cycle time of an event
• Initiate a calibration
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