87
SECTION 3
Communications Power Supply Methods
This section explains the various considerations involved in providing a communications power supply.
3-1
Basic Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
88
3-2
Flowchart: Determining Power Supply Requirements . . . . . . . . . . . . . . . . . .
89
3-2-1
Communications Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . .
89
3-3
Locating the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
90
3-3-1
Power Supply Layout Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
90
3-3-2
Main Factors for Determining the Power Supply Location . . . . . . .
91
3-3-3
Calculating the Power Supply Location . . . . . . . . . . . . . . . . . . . . . .
91
3-4
Step 1: Evaluating the Configuration with Graphs . . . . . . . . . . . . . . . . . . . . .
92
3-4-1
Simple Evaluation of Power Supply Location from a Graph . . . . . .
93
3-4-2
Modifying the Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
93
3-5
Step 2: Evaluating the Configuration with Calculations . . . . . . . . . . . . . . . . .
96
3-5-1
Formulae for Calculating the Voltage Drop . . . . . . . . . . . . . . . . . . .
97
3-5-2
Modifying the Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
98
3-6
Step 3: Splitting the System into Multiple Power Supplies . . . . . . . . . . . . . .
101
3-6-1
Splitting the Power Supply System . . . . . . . . . . . . . . . . . . . . . . . . .
101
3-6-2
Configuration of the Power Supply Tap . . . . . . . . . . . . . . . . . . . . . .
101
3-6-3
Internal Circuits in the Power Supply Tap . . . . . . . . . . . . . . . . . . . .
101
Summary of Contents for DEVICENET -
Page 1: ...DeviceNet Cat No W267 E1 11 OPERATION MANUAL...
Page 2: ...DeviceNet Operation Manual Revised April 2008...
Page 3: ...iv...
Page 5: ...vi...
Page 7: ...viii...
Page 9: ...x...
Page 13: ...xiv...
Page 41: ...20 Basic Operating Procedures Section 1 4...
Page 107: ...86 Operational Checklist Section 2 6...
Page 123: ...102 Step 3 Splitting the System into Multiple Power Supplies Section 3 6...
Page 161: ...140 Index...