4 HANDLING
4-2
4.1 Mounting I/O Modules
In mounting I/O modules in a CPU or I/O unit, take notice of the precautions below to guard
them against noise interference from connections external to them. For information on how to
mount scan-type analog input modules, see Section 4.7, “Handling Scan-type Analog Input
Modules.”
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Do not install an I/O module rated at 100 VAC or 100 VDC or more in the slot adjacent to
the CPU module. Keep such I/O modules as apart from the CPU module as possible. If it
unavoidable to install such a slot in the slot adjacent to the CPU module, keep a cable
extension of at least 100 mm and then use a shielded cable, surge killer or any other
appropriate means to protect against noise.
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In installing option modules and I/O modules in a single CPU mounting base, install the
option modules without an empty slot intervening from the slot adjacent to the CPU module,
leaving one slot space apart from the I/O modules. Further, keep the wirings for option and
I/O modules separated.
z
Install I/O modules rated at 24 VDC or less and those rated at 100 VAC or 100 VDC or more
apart from one another.
z
Install analog input/output and analog counter modules one slot space apart from I/O
modules rated at 100 VAC or 100 VDC or more.
z
Separate wirings for I/O modules according to their operating voltage.
Separate wirings for I/O modules
according to their operating voltage.
PS
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CPU
or
ST
I/O modules
rated at 24 VDC
or less
I/O modules rated
at 100 VAC/VDC
or more
PS
CPU
or
ST
Analog
counter
modules
I/O modules rated
at 100 VAC/VDC
or more
PS
Options
I/O modules rated
at 24 VDC or less
PS
I/O modules rated
at 100 VAC/VDC
or more
CPU CPU
Install analog input/output and analog
counter modules one slot space apart
from I/O modules.
Options
Keep the wirings for option and I/O
modules separated.
Install option modules leaving them one
slot space apart from the I/O modules.
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Figure 4-1 Mounting I/O Modules
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