ProSoft Technology MVI56-AFC - Manual (Page 25)

MVI56-AFC ♦ ControlLogix Platform Quick Start
Liquid and Gas Flow Computer User Manual
ProSoft Technology, Inc. Page 25 of 316
February 25, 2011
2.3.7 Verifying Correct Operation
When all of the configuration steps have been completed, the module should be
ready to perform measurement calculations. To verify that the module is
configured correctly, follow these steps:
1 Enable all meters that will be used, as any meter will only perform
calculations if it is enabled. Any meter can be enabled either with ladder logic
(MVI56-AFC modules), function blocks (PTQ modules) or with AFC Manager.
2 Make sure that the wallclock is running, and that it has valid date and time
information. After power-up, the wallclock will be stopped, therefore the
module will not perform any time-scheduled operations, such as writing
period-end archives, and will not timestamp records written to the event log
until it receives a wallclock command from the ladder logic.
The sample ladder logic programs the wallclock update command upon
detecting "power-up" status from the AFC. The date/time information used is
the same as the processor, therefore you should use the configuration tool for
your processor to verify that the processor has valid date/time data. If the
processor wallclock is not valid (for example if the year = 1900), the module
will not accept the command. You may easily determine if the wallclock is
running by performing two consecutive read operations in the Meter Monitor.
3 Make sure that the meter does not have any alarms. A meter alarm may
affect flow calculation. Look at the Meter Monitor dialog box for alarms.
4 Make sure that the input parameters transferred from the processor are
correct. You can look at these values in the Meter Monitor dialog box.
5 When using a pulse meter, make sure that the pulse input rollover parameter
in Meter Configuration matches the actual input rollover value used in the
high speed counter module.