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.
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