266
Remote I/O Modules
Section 5-3
Precautions on Bending Conductor Pattern
When it is necessary for the conductors of the pattern connecting the BD L
and BD H terminals of the terminal block to those of either SRT
@
-ID16P or
SRT
@
-OD16P to change direction, make sure the direction does not veer at a
right angle. Keep the direction change within 45
°
.
Noise Protection Circuit
Add the following protection circuit if noise is generated from the power sup-
ply, input section, or output section.
Note
1.
Mounting and PCB Cleaning:
• If a soldering iron is used to solder the circuit, make sure that the circuit
is soldered within 3 s at 280 to 300
°
C.
• If a soldering tub is used to solder the circuit, make sure that the circuit
is soldered within 5 s at 260
°
C maximum.
• Do not pass through a reflow furnace. If it is necessary to pass through
a reflow furnace, after reflow processing manually apply soldering only
to the main parts.
• Do not apply strong acid or alkali solvent to clean the flux. Also, do not
apply ultrasonic cleaning.
SRT
(
-ID16P/
OD16P
BD L
BD H
BD L
BD H
Terminal
block
Within 45
°
Power supply noise protection
circuit
Input section noise protection circuit
Output section noise protection
circuit
L: Coil for the common mode
(100
µ
H min.)
Install the coil near the SRT
@
.
V: 24 V DC
(Even if a separate power supply is
used, the same kind of protection is
recommended.)
R1: Resistor for limiting photocoupler
input current
D: Photocoupler protection diode
C: Noise absorption condenser
R2: Resistor for limiting operating level
PHC: Photocoupler
V: DC power supply
Recommended circuit example:
R1: 2.7 k
Ω
; 1/2 W
R2: 390
Ω
; 1/4 W
C: 50 V; 0.1
µ
F min.
(However, these are only examples and
are not guaranteed values. Construct
the circuit in accordance with the char-
acteristics of the input device to be con-
nected.)
C: 0.1
µ
F min.
R: Limiting resistor
SA: Varistor
D: Back-electromotive force protection
diode
PHS: Photo coupler
V: DC power supply
100
µ
F
0.1
µ
F
50 V
50 V
BS +
BS –
SRT
@
L
V
+
Input
device
0 to 15
SRT
@
G
PHC
R2
C
D
R1
V
PLC: Photocoupler
Load
BS +
R
0 to
15
SRT
@
G
PHC
R
C
R
D
SA
V