Omron 3G8F7-CRM21, User Manual

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177
Wiring for a CompoNet Network
Section E-3
Types and
Characteristics of
Terminating Resistors
There are 2 types of Terminating Resistors: the connector type and the
terminal-block type.
Precautions for Correct Use
If you connect a Terminal Block-type Terminating Resistor to a Round Cable
II, insulate the ends of the BS+ and BS
−
power lines.
Connecting
Terminating Resistors
A Terminating Resistor can be connected using one of three different
methods, as shown below:
Method 1 Connect a Flat Connector Socket to the trunk line of a sub-trunk
line cable.
Mount a Terminating Resistor onto the Connector Socket.
Method 2 Attach a Multidrop Connector on the communications connector
(or an upstream port) provided on a Slave Unit or Repeater Unit.
Connect a Flat Connector Plug to which the trunk lines or sub-
trunk line is connected to the Multidrop Connector. Also, connect
a Terminating Resistor to the Multidrop Connector.
Type Connector type Terminal-block
type
Name Terminating Resistor
Model DCN4-TM4 DCN5-TM4 DRS1-T
Resistance 121
Ω
121
Ω
121
Ω
Power rating 1/4 W 1/4 W 1/4 W
Accuracy 1% max. 1% max.
−
Power-handling
capacity 0.01
µ
F 0.01
µ
F
−
Applicable cable Round cable II, Flat
Cable I Flat Cable II Round cable I
Round Cable II
When the line is Flat Cable I When the line is Flat Cable II
DCN4-TM4
Terminating Resistor
Flat Connector
Socket
DCN5-TM4
Terminating Resistor Flat Connector
Socket