DSP-OHMNI Instruction Manual I-GARD
13
The Display module is the master module and is constantly sending requests for data from each feeder
module from 1 to 50. The Feeder Modules compare the request I/D with their own I/D to decide whether
or not they are being asked for data. If the I/D is the same then that Feeder Module replies with Current,
Priority and Status information to the master Display Module. Therefore it is very important that there
are not modules in the chain with the same I/D. The Feeder Select program checks for duplicate I/D
when ENTER is pressed following an entry of FEEDER SEL xx. If an existing I/D is detected, the screen will
indicate as in Figure 6.5.
I/D IN USE 01
TRIP ON PRIOR 00
Figure 6.5 I/D Check indication
In this case the user must enter a different I/D number before proceeding further. The user is allowed
another chance to enter a valid I/D number before the cursor moves to TRIP ON/OFF selection. This
permits the TRIP and Priority of previously set modules to be changed while retaining the same I/D number.
CAUTION! IT IS ENTIRELY POSSIBLE FOR THE USER TO ENTER A NUMBER OUTSIDE THE RANGE 01 TO 50 AND
THE SYSTEM WILL ACCEPT IT WITHOUT WARNING, DATA WILL NOT BE COLLECTED FROM SUCH MODULES,
ALTHOUGH THEY WILL CONTINUE TO PROVIDE FAULT PROTECTION.
Typically, the numbers will be in the sequence 1,2,3,4…. but they can be in any order physically. The
Display Module does not care. The identification number, however, must be known for each feeder circuit
since the Display does not support the use of Text Labelling to identify circuits. Note: This can be done
with user-provided software from the RS-485 network if required or by use of the DSP.net server package
downloadable from the I-Gard web site. See communications section.
Press ENTER to select the Ident Number. The cursor then drops to TRIP ON setting which is the normal
setting. To disable the TRIP function of the Feeder Module press t arrow in which case no priority is
required to be set and the Screen of Figure 6.6 is presented.
If the TRIP feature is to be retained (normal setting) pressing ENTER will then allow the user to set the priority
of the selected Feeder I/D. To change the number, use the pq arrows to increase/decrease the digit under
the flashing cursor and ut to change digits. The range of priority numbers is from 00 to 15 with 0 being a
lower priority than 15. In the case of Priority numbers it is OK to use the same number more than once unlike
the I/D numbers, so that unimportant circuits can all be set to 00, for example.
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