3-3
Section
Sharing the Communications Power Supply
36
Group 2:
(10 x 0.015 + 1 x 0.005) x 1.1 = 0.1705 V
Total voltage drop for System 1 = 0.2744 + 0.1705 = 0.4449 V
0.65 V
Thus, the best location for the nodes can be determined by using the second
formula.
System 2
Group 3:
(10 x 0.015 + 1 x 0.005) x 0.5 = 0.0775 V
Group 4:
(30 x 0.015 + 2 x 0.005) x 0.85 = 0.391 V
Total voltage drop for System 2= 0.0775 + 0.391 = 0.4685 V
0.65 V
Thus, the best location for the nodes can be determined by using the second
formula.
3-3-6 Step 3: Splitting the System into Multiple Power Supplies
Go to Step 3 if the best location for the nodes cannot be calculated from the for-
mulae. In the third step, there are multiple power supplies and the power supply
system is split.
Splitting the Power Supply System
•
Be sure to use a Power Supply Tap for each power supply when the network is
supplied by two or more power supplies.
•
Remove the fuses in the Power Supply Tap to split the power supply system.
Once the power supply system is split, return to Step 1 or 2, and determine the
best location of the nodes in each system.
Power Supply Tap Configuration
Model
Name
Specifications
Manufacturer
DCN1-1P
Power Supply
Branch Tap
Includes two
connectors
OMRON
1485T-P2T5-T5
Power supply tap
Includes ground
terminal
Allen-Bradley
Connector C
Fuse A
Cable A
Power supply cable
Fuse B
Connector B
Cable B
Connector A
Power Supply Tap
