Part 2

Plug-In Assembly Configuration 523Design Suggestions for the Analog SectionThe following paragraphs provide some suggestions and precautions for designingcustom circuits using the analog section. See Chapter 6 for commands to controlthe analog section.lnguard Low Referenced Power SuppliesThere are two power supply references associated with the analog section (thereference is that point from which the power supply voltage(s) is measured). Onereference is lnguard "LOW" and the other is "GUARD". There are four power sup-plies which are referenced to lnguard LOW: + 5V Relay, +5V Logic, + 15V L and-8V TC. Total circuit dissipation allowed is 2 watts per assembly even if both theanalog and digital sections are used.The + 5V Relay, +5V Logic and + 15V and -8V TC supplies are referenced to InguardLOW. The + 5V Relay and + 5V Logic supplies have the same origin, but theground returns keep any noise generated by switching relays from entering the logiccircuitry.Maximum total current which can be drawn from these supplies is 50 mA. The rangeof both supplies is 4.85V to 5.25V and will typically be about 5.1V. The suppliesappear on the backplane connector as follows: +5V Relay at pin L; Relay Gnd atpin M: +5V Logic at pin 10 and Logic Gnd at pin 11.Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com