Micromod MOD: 30ML Functions Data Base Reference - Manual (Page 127)

MOD 30ML Functions
CONFIGURATION EXAMPLES
3.3.5 TOTALIZER COMPOUNDS
Many flow applications require simultaneous control and totalization of the process. In the
past a separate device was commonly used for totalization while flow control was left to a
PID controller. If there was to be any interaction or relationship between the two devices it
was often difficult if not impossible to implement. MOD 30ML can provide accurate PID
control and totalization for multiple loops. MOD 30ML’s versatile display permits a variety of
display options whereby the totalizer, totalizer commands and PID can be combined on the
same display tag or may be split to multiple display tags.
These compounds provide a way to implement a totalizer block and various display options
for totalizer commands of reset, stop, hold and run. Refer to Logic Book 2 (IB-23G602
Section 8.10) for functional information on the totalizer block.
3.3.6 Configuration Overview
If your Application Builder is version 5 or newer the Compounds directory will offer two
PID/totalizer display compounds (PIDTOT1.CSM and PIDTOT2.CSM). Both compounds
include a single loop PID and totalizer function and are applicable to MOD 30ML firmware
Version 2.0 and above. If you don’t find these compounds, the instructions in IB-MLAPP-
TOT, Totalization Application Guide, will help you build the PID, totalizer and display(s) from
scratch.
PIDTOT1.CSM uses one display tag for the PID, totalized value and totalizer command
functions. This functionality is probably the most common display used for a PID and totalizer
application. PIDTOT2.CSM places the PID and totalized value on one tag display and the
totalizer command functions on a second display tag.
3.3.7 PIDTOT1.CSM - Totalizer and PID
This compound, Figure 3-4, includes the totalizer display and its command functions on the
same display tag as the PID display. This is handy because the operator does not have to
leave the PID display to see the totalized value or to use the totalizer commands.
To use this compound:
1. Enter your loop tag name in the display (DISP) and DIF blocks.
2. Set the to “User” and enter the Display Tag name in the
field. This causes the instrument to come up after a power loss with your new display.
3. Enter the totalizer block and set the proper rate, threshold, etc. values.
4. Set the input and PID block fields to meet with your particular application.
5. Enter a scan group rate in the IF block.
6. Add the data found in the State Table Description block to the State Table Block by
adding the two state tables found below.
7. Place the proper communications block.
8. Compile and download the strategy.
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