Power Supplies - OPTO 22 PCI-AC5 User Manual

Power Supplies

We recommend that you follow these guidelines on power supplies used with your I/O system:
•
•
•
•
•
•
Pin Function
41 Point 3
39 Point 4
37 Point 5
35 Point 6
33 Point 7
31 Point 8
29 Point 9
27 Point 10
25 Point 11
Use only isolated switching or linear power supplies.
Do not connect the negative terminal of any power supply to the computer chassis or to earth
ground. Doing so can cause ground loops that may interfere with the operation of the rack,
the adapter card, or the computer.
Use a single power supply per rack, if possible. If you have to use a single power supply for
more than one rack, use conservatively gauged conductors in a star configuration to distribute
power.
Do not share a rack power supply among multiple computers. Doing so connects the common
and ground of all the computers together.
On racks that have two header connectors, do not share the rack between two computers.
Again, doing so connects the common and ground of both computers together.
Always use a separate power supply for the field side of the I/O. Using the rack power supply
for field actuation and monitoring defeats the isolation the I/O module provides. A sudden
change of current on the field side may interfere with the operation of the rack, the adapter
card, or the computer.
Pin Function
15 Point 16
13 Point 17
11 Point 18
9 Point 19
7 Point 20
5 Point 21
3 Point 22
1 Point 23
All even pins Common
PCI-AC5, PCIe-AC5, AC5, and G4AC5 User's Guide
CHAPTER
21
21