User manual

D-12
Appendix D MC-III™ EXP Flow Analyzer
Polling Registers
The MC-III EXP device stores the volume accumulated since the last polling sequence in a set of polling
registers (17023). In addition, the instrument monitors the number of seconds of ow time in each polling
interval (17025). There is also an index to the number of polls requested (17039).
The polling sequence is started by writing to the Control Register. Writing the Control Register 1 (70) with
a value of 20000 decimal transfers the polling total (17023) and polling run time (17025), to the previous
polling total (17035) and previous polling run time (17037) registers, increments the polling index (17039)
register and resets the polling total and polling run time registers.
Pointer/Daily/Event Pointer (registers 17001 through 17006)
These registers provide an index of the last record that was stored in the log data. These values start at 1 and
increment with each newly created log. When the maximum number of records is reached, the pointer resets
at 1 and starts incrementing again.
Real Date (registers 17007, 17008)
This register is a oating-point representation of the date, formatted as MMDDYY. For example, a value of
91005 represents a date of September 10, 2005.
Real Time (registers 17009, 17010)
This register is a oating-point representation of time, formatted as HH:MM:SS. For example, a value of
180205 represents a time of 6:02:05 PM.
Totals
The instrument provides Grand Total (17011), Daily Total (17015), Hourly Total (17019) and a Polling Total
(17023). It also provides Previous Day Total (17027), Previous Hour Total (17031), and Previous Polling
Total (17035). These totals are available in terms of congured units and base units. Refer to Base Units/
Congured Units, page D-11, for details.
Pulse Output Pulses (register 17077)
When the pulse output is enabled (see Pulse Output Source, register 4000), this register indicates the
current number of output pulses to be sent to the output relay, based on the congured duration. In a typical
application, this register will generally indicate a small number, then quickly count down to zero. In a
situation where pulses are being cached, the pulses register will indicate a large value. When the pulse output
is disabled, a user can use this register to write a desired number of pulses to be output, for use in testing end
devices. Users can also perform this output test from the software Pulse Output conguration screen. For
details, see Pulse Output Testing, page 74.
Analog Output Current (register 17079)
When the analog output is enabled (see Analog Output Source, register 4005), this register indicates the
calculated output current based on the low and high values and the instantaneous ow rate. When the analog
output is disabled, a user can use this register to write a desired output current for use in testing end devices.
Users can also perform this output test from the software 4-20 mA Output conguration screen. For details,
see 4-20 mA Output Testing, page 71.
Calculated K-Factor (register 17081)
This register represents the K-factor that was used for the most recent calculation interval. This number
is calculated based on the factor type (register 2008), the instantaneous frequency from the owmeter,
calibration frequencies (registers 2011 through 2033), and calibration factors (registers 2035 through 2057).