Omron CVM1 Series, Operation Manual

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17
Cable Length and Terminating Resistance Settings Section 2-4
Transmission Line
and Terminating
Resistance Switches
(WIRE and TER)
For details on setting these switches, refer to 3-3-5 Setting the Transmission
Line and Terminating Resistance .
2-4 Cable Length and Terminating Resistance Settings
Cable Length
• The basic structure of the PC Link system has a main line with extending
branch lines. The total length of the cables in the PC Link system (includ-
ing the main line and branch lines) must not exceed 500 m.
L
1
+ L
2
+ L
3
+ ... L
n
+ I
1
+ I
2
+ ... I
n-1
≤
500 m
• The individual branch lines must not exceed 10 m.
I
1
≤
10 m, I
2
≤
10 m, ... and I
n-1
≤
10 m
Name Function Left side Right side
WIRE Transmission line
setting Four-wire method
(Set when using electrical
and optical fiber cable.)
Two-wire method
(Set when using electrical
cable only.)
TER Terminating resis-
tance setting Terminator connected. Terminator disconnected.
WIRE
4
↔
2
TER
ON
↔
OFF
PC LINK
Terminating Resistance Setting Switch
Transmission Line Selector Switch
Node 0
Terminator ON
I1
I2
I (n
−
1)
L1
L2
L3
Ln
Node 1
Terminator OFF
Node 2
Terminator OFF
Node n-1
Terminator OFF
Node n
Terminator ON