7. Wiring
7-18
7.7.4 Setting terminating resistance
When using the designated cables, connect the terminals as shown in Table 7-5. This will terminate the lines
with a built-
in 100Ω or 150Ω resistor (or an externally wired 100Ω resistor on the RI/O-IF module). To
terminate with a resistance other than
100Ω or 150Ω using non-designated cables, connect a resistor across
the signal input terminals (A and B).
Table 7-5 Setting terminating resistance
100Ω termination
150Ω termination
Termination with arbitrary
resistance
RI/O-IF
module
A: Wire together with signal
cable
A: Wire together with signal
cable
Note 1:
Set a 150Ω terminating
resistance at ports to
which no remote I/O
cables are connected.
R: Characteristic impedance of
remote I/O cable
A and B: Wire together with
signal cable
Remote I/O
station module
R: Characteristic impedance of
remote I/O cable
A and B: Wire together with
signal cable
■ Recommended specification of terminating resistor (R):
Type: Metal oxide film resistor
Resistance value: Same as cable impedance
Tolerance: ±10%
Power rating: 0.5 W (1/2 W)
Shape: Axial
Terminal block
Terminal block
Terminal block
150
Ω
(A7)
COM
(A8)
R
B
(A5)
A
(A4)
RI/O-1
side
Terminal block
Terminal block
R
RI/O-1 side
B
(A8)
RI/O-2 side
B
(B7)
A
(A7)
A
(B6)
R
RI/O-1 side
150
Ω
(A5)
A
(A7)
RI/O-2 side
150
Ω
(B4)
A
(B6)
RI/O-1
side
100
Ω
(A6)
A
(A7)
RI/O-2
side
100
Ω
(B5)
A
(B6)
Terminal block
COM
(A8)
100
Ω
(A9)
Note 2: For the actual RI/O-IF module, cables cannot be
attached on the terminal block from the right side.
The preceding figures show cables attached from
the right to make the wiring easier to understand.
Summary of Contents for S10VE
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