2: M
ODULE
S
PECIFICATIONS
FC5A MicroSmart User’s Manual FC9Y-B1268
2-71
Power Supply for Analog I/O Modules
When supplying power to the analog I/O modules, take the following considerations.
•
Power Supply for FC4A-L03A1, FC4A-L03AP1, FC4A-J2A1, FC4A-K1A1, and FC4A-K4A1
Use separate power supplies for the MicroSmart CPU module and FC4A-L03A1, FC4A-L03AP1, FC4A-J2A1, FC4A-K1A1,
and FC4A-K4A1. Power up the analog I/O modules at least 1 second earlier than the CPU module. This is recommended
to ensure correct operation of the analog I/O control.
Note:
When re-powering up the analog I/O modules FC4A-L03A1, -L03AP1, and -J2A1, a time interval is needed before turning on
these modules. If a single power supply is used for the MicroSmart CPU module and the analog I/O modules, turn on the analog I/O
modules at least 5 seconds (at 25°C) after turning off these modules. If separate power supplies are used for the MicroSmart CPU mod-
ule and the analog I/O modules, turn on the analog I/O modules at least 30 seconds (at 25°C) after turning off the analog I/O modules
whether the CPU module is powered up or not.
•
Power Supply for FC4A-J4CN1, FC4A-J8C1, FC4A-J8AT1, and FC4A-K2C1
Use the same power supply for the MicroSmart CPU module and FC4A-J4CN1, FC4A-J8C1, FC4A-J8AT1, and FC4A-K2C1 to
suppress the influence of noises.
After the CPU module has started to run, ladder refresh type analog input modules perform initialization for a maximum
of 5 seconds. During this period, the analog input data have an indefinite value. Design the user program to make sure
that the analog input data are read to the CPU module after the analog input operating status has changed to 0 (normal
operation). For the analog input operating status, see page 9-14.
Wiring Analog I/O Lines
Separate the analog I/O lines, particularly resistance thermometer inputs, from motor lines as much as possible to sup-
press the influence of noises.
Terminal No.
Channel
+
24V DC
–
+
OUT
–
NC
A
IN0
+
B’
–
B
NC
A
IN1
+
B’
–
B
Fuse
+
–
24V DC
Resistance
thermometer
B
+
–
A
B’
Analog voltage/current
input device
+
–
Analog voltage/current
output device
Separate the analog I/O line
from the power line.
Note:
FC5A all-in-one 24-I/O type CPU modules cannot use analog I/O modules in combination with the AS-Interface master module
(FC4A-AS62M) and/or expansion RS232C/RS485 communication module (FC5A-SIF2 or FC5A-SIF4). When using these modules in com-
bination with analog I/O modules, use the slim type CPU module.
Wiring 2-Wire Analog Current Output Devices
To use an analog input module with a 2-wire analog device, wire the analog device in series with a separate 24V DC
power supply.
Terminal No.
Channel
24V
24V DC
0V
NC
—
+
IN0
–
+
IN1
–
+
IN2
–
Fuse
+
–
24V DC
Analog current output
device
–
+
+
–
24V DC
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