Emerson Process Management MSP-ULOG1 Application/Duty Logging, Overview, Data Logging Indicator

Application/Duty: Logging

Overview

The MCULOG will log up to 4,800 events, where an event is the value of the Primary Variable (PV) at regular intervals; the logging interval is user-defined (P590). An interval value of 15 minutes will log the PV at 15-minute intervals, which equates to 50 days elapsed time.

If the MCULOG has been set-up to totalise the PV (see pages 6/7), the daily value of the totaliser at midnight is also logged. Up to 60 midnight totalised values will be held in memory. (This is in addition to the 4,800 sample memory.)

In addition, the maximum instantaneous value of PV recorded in each 24-hour period is logged.

It is recommended that the Mobrey Measurement’s PC software, Mobrey Log-View, is used to download and view data. See data sheet IP122.

Data Logging Indicator

The MCULOG gives a visual indication that logging of data is underway by flashing the “LOG” text in the bottom, right-hand corner of the display.

Fast Log Mode

Should the PV exceed a user-entered value (P591), the MCULOG automatically moves to a fast log mode and then logs the PV once every minute until the PV falls below that user-entered value. Fast log values are flagged so that they are easily identified when examining logged data via Mobrey Log-View.

Memory Nearly Full Alarm

The user may allocate an alarm to indicate when the memory remaining reaches a user-defined percentage (P593). The user must also set the action to be taken when this occurs. A choice of activating a relay, driving the output current to a set level or doing both is available (P542).

If no action is taken, the memory will fill up and then either logged data will be overwritten or the logging will stop, as determined by parameter P592.

Download of Logged Data

Logged data may be downloaded at any time using the RS232 data port socket provided. Users will normally download data using a handheld communicator or a PC loaded with logger software Mobrey Log-View.

Starting, stopping and resetting the logger

To start logging, simply change the logging interval (P590) from 0 to the interval required. Logging is now activated.

To stop logging, simply change the logging interval (P590) back to 0. Note, when the logging interval is re-set, all logged data will be cleared from the logging memory.

The MCULOG can be re-set by changing the log interval from 0 to a logging interval in minutes which will clear all data logged (i.e. clear the 4,800 sample memory plus the 60 midnight totals).

Changing the log interval from a non-zero interval (e.g. 15 minutes) to a new non-zero interval (e.g. 5 minutes) will clear the sample data only (i.e. clear the 4,800 sample memory).

Further information

Refer to manual IP2042/OM for full programming and data download details.

(IP2042/QS) 8 January 2006