6.3 Precautions for Communications Line Design
6-11
6
Determining the Best Location of the Power Supply from a Graph
Verify the Items
c
to
e
below for each node located in the same direction viewed from the
power supply. Therefore, if nodes are located on both sides of the power supply, these items
must be verified for all nodes located in each direction.
c
Find A, the total current consumption of all the nodes located for each direction.
d
Using the graph compute B, the maximum current flow in each cable from the power sup-
ply to the end of the trunk line according to the types of cables (thick or thin).
e
Compare the values found in Steps
c
and
d
, above. If the first value (A) is the same as
the second (B) or less, this shows that power supply specifications are met and power can
be supplied to all nodes at any point in the network.
Note
Be sure to refer to the correct graph because the maximum current flow is different for thick and
thin cables.
Countermeasures
If the second value (B) is less than the first (A), use the following procedure to locate the
communications power supply.
• Locate the communications power supply in the center of the network and the nodes to
both sides of it.
• If the nodes are already located at both sides of the power supply, move the power sup-
ply in the direction that requires the larger current capacity.
• If thin cable is being used, replace it with thick cable.
Note
If, after following the above procedure, B is still the same as A or less, go to Step 2 and determine
the actual position of the nodes by the formula calculation method.
Summary of Contents for OMNUC W R88A-NCW152-DRT
Page 1: ...Cat No I538 E3 1 DeviceNet Option Unit OMNUC W Series Model R88A NCW152 DRT...
Page 53: ...4 Connectors 4 5 3 DeviceNet Network Configuration Restrictions 4 22 4...
Page 97: ...5 Parameter Settings 5 3 8 Notch Signal Output Positioning 5 44 5...
Page 211: ...8 Servo Driver Settings 8 5 3 Absolute Encoder Multi turn Limit Setting 8 24 8...
Page 257: ...9 Troubleshooting 9 46 9...