2: M
ODULE
S
PECIFICATIONS
2-13
Power Supply for Analog I/O Modules
When supplying power to the analog I/O modules, take the following considerations.
•
Power Supply for END Refresh Type Analog I/O Modules
Use separate power supplies for the
MicroSmart
CPU module and END refresh type analog I/O modules. 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.
•
Power Supply for Ladder Refresh Type Analog I/O Modules
Use the same power supply for the
MicroSmart
CPU module and ladder refresh type analog I/O modules 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 opera-
tion). For the analog input operating status, see page 4-13.
Wiring Analog I/O Lines
Separate the analog I/O lines, particularly resistance thermometer inputs, from motor lines as much as possible to suppress
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.
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