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Reference Manual
IP2030/RM, Rev AA
Section 4: Getting started
June 2014
Section 4: Getting started64
4.5.19 Data logging on the Mobrey MCU90F
The Mobrey MCU90F can record (log) up to 7000 events at regular intervals.
Each event is a parameter value. The parameter to be recorded (logged) is the one
selected for the middle section of the display (see Figure 2-4 on page 7).
This parameter-to-be-logged is typically the control unit Primary/Process Variable (PV).
If the MCU90F has been set-up to totalize, the daily value of the totalizer at midnight is
also logged. Up to 60 midnight totalized values are held in memory. This is in addition
to the memory for 7000 events.
The maximum value of the parameter-to-be-logged in each 24-hour period is also
logged.
The MCU90F gives a visual indication that logging of data is underway by flashing “LOG” in the
bottom, right-hand corner of the Full PV Display.
Note
Logged data may be downloaded at any time using the RS232 data download socket,
supplied with a Mobrey MCU90F (see “RS232 connections” on page 22), and Mobrey
LOG-VIEW software running on a Windows PC.
See “Serial communications” on page 104 for RS232 communication parameters.
Menu: SETUP / [CONTROLLER /] LOGGING
P590 Log Interval (Default is 15 minutes)
The logging interval is the period over which the parameter-to-be-logged is sampled
every five seconds and then averaged at the end. The averaged value is then logged.
An interval value of 15 minutes logs the averaged value at 15-minute intervals, which
equates to 50 days elapsed time.
P591 Fast Log (Fast log mode) (Default is 0)
If the parameter-to-be-logged value is higher than a user-entered value (P591),
the MCU90F automatically moves to a fast log mode.
The parameter-to-be-logged is then logged once every minute until the logged value is
less than P591. Fast logged values are tagged for easy identification when examining
logged data.
P593 Low Mem Alarm (Default is 0%)
An alarm can be raised to indicate when the unused memory falls to below a
user-defined percentage (P593). See “Set-up alarms” on page 91 for selecting if this
alarm is indicated by a relay output, driving the output current to a set level, or both.
When the memory is full, logged data is either overwritten or the data logging stops, as
determined by parameter P592.
Parameter D846 shows the percentage of free memory remaining for data logging.
P592 Data Overwrite (Default is “On”)
After the logging memory is full, there is a choice to continue data logging and
overwrite the oldest data (On) or to stop data logging (Off).