Despatch Protocol Manager with Protocol Plus - Manual (Page 36)

Protocol Manager Software E-100
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Log File Record Data
Check the following boxes to select the types of data to be written into the log file itself:
Elapsed Time
Entry Date and Time
Temperature Setpoint
Temperature Value
Alarms and Events Status
Recipe Name
Log File Folder
This field displays the folder used to store datalog files.
Log At Intervals/Log at Profile Change
These buttons determine whether data will be logged at a certain time interval (see Log
Entry Interval, below), or if data will be logged at every change point programmed into
the recipe (start point, beginning of ramp, beginning of soak, etc.). Select one of these
logging options depending on the detail level required, and the amount of disk space
available for log records. Typically, a short run with few steps might use the time interval
option, and a long run with many steps might use the profile change option.
Log Entry Interval: This value controls how often data is logged into a local disk file
when selected for a running controller. For example, if two minutes is selected, data will
be logged from each running controller approximately every two minutes; it does not
mean that all controllers will be polled for data within a two minute period.
The minimum usable interval depends on the number of controllers in the network.
Typically, the minimum interval, in seconds, can be approximated by Tmin = 4 + N,
where N = number of Controllers on the network.
Datalog files take up storage space. Typically, a log file's header contains from 10 to up
to about 250 bytes, plus Lot Information (Lot Information contains from 0 to 576
bytes), depending on which header information is selected. Each logged data entry
contains up to 50 bytes, depending on which data is selected. One running controller,
logging data every 15 seconds, would produce a datalog growing at a rate of about 11
Kbytes per hour. 11 Controllers running at this rate would consume about 1 Mbyte of
storage every 8 hours.
The datalog is enabled by the Enable Datalog checkbox in the Run Time Window
(described later in this manual).