Hitachi S10mini D, Hardware Manual

Page: 66 / 132

5 WIRING
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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.
Termination with a 100
Ω
resistor Termination with a 150
Ω
resistor
Termination with a resistor
having a suitable resistance
CPU module
RI/O
station
module
A
( A7 )
A
( A7 )
A
( B6 )
A
( B6 )
100
Ω
( A6 )
100
Ω
( A9 )
COM
( A8 )
COM
( A8 )
150
Ω
( A7 )
100
Ω
( B5 )
Terminal block
150
Ω
( A5 )
150
Ω
( B4 )
Terminal block
Terminal block
R
R
R
A
( A7 )
B
( A8 )
A
( A4 )
B
( A5 )
A
( B6 )
B
( B7 )
On the
RI/O-1 side
On the
RI/O-1 side
On the
RI/O-1 side
R: Characteristic impedance of the
remote I/O cable
A, B: Tighten the terminal together
with the signal cable.
A: Tighten the terminal together
with the signal cable. A: Tighten the terminal together
with the signal cable.
* Terminate those ports to which
the remote I/O cable is not
connected.
R: Characteristic impedance of the
remote I/O cable
A, B: Tighten the terminal together
with the signal cable.
On the
RI/O-2 side
On the
RI/O-2 side
On the
RI/O-1 side
On the
RI/O-2 side
Terminal block
Terminal block
Terminal block
Recommended terminating resistors
Classification by material: Metal oxide
film resistor or metal film resistor
Resistance: Same as the impedance of the
cable
Accuracy: ± 10%
Capacity: 1/2 W
Shape: Axial
Number on the terminal block
Signal CPU module RI/O module
RI/O1 RI/O2 RI/O1 RI/O2
150
Ω
A5 B4 A7
⎯
100
Ω
A6 B5 A9
⎯
COM
⎯ ⎯
A8
⎯
A A7 B6 A4 B5
B A8 B7 A5 B6
SHD A9 B8 A6 B7