Setting Terminating Resistors - Hitachi S10mini S Hardware Manual

5 WIRING
5.6.3

Setting terminating resistors

When a specified cable is used, it must be terminated with a built-in 100 Ω or 150 Ω resistor
by connecting terminals, as shown below. When using a non-specified cable and terminating
it with a resistor having a resistance other than 100 Ω or 150 Ω, insert a resistor between signal
input terminals A and B.
CPU module
RI/O
station
module
Signal
150 Ω
100 Ω
COM
A
B
SHD
Ω
Termination with a 100 resistor
Terminal block
On the
RI/O-2 side
100 Ω
On the
(B5)
RI/O-1 side
100 Ω
(A6)
A
(B6)
A
(A7)
A: Tighten the terminal together
with the signal cable.
Terminal block
COM
(A8)
100 Ω
(A9)
Number on the terminal block
CPU module RI/O module
RI/O1 RI/O2 RI/O1
A5 B4 A7
A6 B5 A9
⎯ ⎯
A8
A7 B6 A4
A8 B7 A5
A9 B8 A6
Ω
Termination with a 150 resistor
Terminal block
On the
RI/O-2 side
150 Ω
On the
(B4)
RI/O-1 side
150 Ω
(A5)
A
(B6)
A
(A7)
A: Tighten the terminal together
with the signal cable.
* Terminate those ports to which
the remote I/O cable is not
connected.
Terminal block
150 Ω
(A7)
COM
(A8)
Recommended terminating resistors
Classification by material: Metal oxide
RI/O2
film resistor or metal film resistor
⎯
Resistance: Same as the impedance of the
⎯
⎯
cable
B5
Accuracy: ± 10%
B6
B7
Capacity: 1/2 W
Shape: Axial
- 48 -
Termination with a resistor
having a suitable resistance
Terminal block
On the
RI/O-2 side
A
On the
(B6)
RI/O-1 side
R
A
(A7)
B
(B7)
R
B
(A8)
R: Characteristic impedance of the
remote I/O cable
A, B: Tighten the terminal together
with the signal cable.
Terminal block
On the
RI/O-1 side
A
(A4)
R
B
(A5)
R: Characteristic impedance of the
remote I/O cable
A, B: Tighten the terminal together
with the signal cable.