Micromod MOD: 30ML and Modcell Maintenance for 2001N, 2002N, and 1800R - Manual (Page 146)

Technical Notice
Below is a sample calculation for an overconfigured instrument. The interval ratio is a factor used to
normalize each scan group to a time slice of a 50mS unit.
Scan Scan Interval
Group Interval MTIME Ratio Time/50mS
1 300 314 x 50/300 = 52.3
2 350 324 x 50/350 = 46.3
3 400 295 x 50/400 = 36.9
4 450 310 x 50/450 = 34.4
5 500 404 x 50/500 = 40.4
6 50 24 x 50/50 = 24.0
7 50 13 x 50/50 = 13.0
8 50 0 x 50/0 = 0.0
9 50 0 x 50/0 = 0.0
Total = 247.3
The calculations above show that the configuration is asking for over 247mS of processing to be done every
50mS. Notice that only group 1 is overconfigured, but even if its MTIME value was zero, the instrument would
still be overconfigured.
To eliminate the overconfigured diagnostic, there are three directions that can be taken.
1. Increase one or more of the group scan interval times
2. Optimize the configuration for more efficient operation
3. Remove some of the functions from the database
The easiest solution would be to increase the scan interval times, assuming that acceptable updates could still
be performed. The best solution may be to implement a combination of all three actions.
Topic: MOD 30ML/Modcell Technote: TNML0302-2
MicroMod Automation, Inc. Rev. 2, Mar-2002
Overconfig.doc Page 2 of 2