![background image](http://html.mh-extra.com/html/omron/c200hw-clk21/c200hw-clk21_operation-manual_742483123.webp)
98
C200HX/HG/HE Controller Link Units
Section 4-3
Note
1.
Do not use the same operating level for more than one Unit mounted to the
same PLC. An error will occur is the same operating level is set twice.
2.
Operating levels are used by the CPU Unit to distinguish different Commu-
nications Units. Each node can have a different operating level, i.e., it is not
necessary to use the same operating level for all nodes in the same Net-
work.
4-3-4
Terminating Resistance
Turn ON the terminating resistance using the switch on the bottom of the Unit
for the Units of both ends of the Network. The terminating resistance is
required at both ends of a Network to absorb unnecessary signals and reduce
noise.
The Controller Link Unit has built-in terminating resistance, which can be con-
nected simply by turning ON the slide switch.
Note
1.
Always turn OFF the PLC’s power before setting the terminating resistance
switch.
2.
Turn ON the switch to connect terminating resistance at the nodes at both
ends of the Network and turn OFF the switch at all other nodes. Normal
communication cannot be performed in the Network unless all the nodes
are set properly.
3.
The TER LED indicator will light when the terminating resistance switch is
set to ON.
Pin 4
Operating level
Node
OFF (factory default)
Operating level 1
Set all the nodes on the
Network to either Operat-
ing level.
ON
Operating level 0
Operating level 0
Operating level 1
Operating level 0
Operating level 1
Note
It is not necessary to use the same operating
level for all nodes in the same Network.
Bottom switch
Terminating resistance
OFF (factory default)
Not connected.
ON Connected.
ON
Summary of Contents for C200HW-CLK21
Page 3: ...iv ...
Page 9: ...x ...
Page 12: ...xiii TABLE OF CONTENTS Index 367 Revision History 373 ...
Page 13: ...xiv ...
Page 19: ...xx ...
Page 57: ...32 Application Precautions Section 1 5 Example CX Programmer Response Timeout Setting ...
Page 69: ...44 Message Service Procedure Section 2 2 ...
Page 111: ...86 Constructing Networks with Repeater Units Section 3 4 ...
Page 154: ...129 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 261: ...236 Response Codes Section 6 7 ...
Page 297: ...272 Message Delay Times Section 8 4 ...
Page 353: ...328 Handling Precautions Section 9 6 ...
Page 364: ...339 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 365: ...340 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 369: ...344 Standard Models Appendix A ...
Page 391: ...366 Using the Relay Terminal Block Appendix C ...
Page 397: ...372 Index ...
Page 401: ...376 Revision History ...