7
ATTENTION
Preventing SCU Module Malfunctions
• Be sure to power off the PLC system before installing
or removing an SCU module.
• Ensure that the SCU module is secured onto the
backplane before operating it.
• Be cautious of metal chips when wiring for the SCU
module. Metal chips and debris that fall into the
module can cause damage.
• Do not touch with your hand the connector on the
bottom of the module which is used to connect to the
backplane . Otherwise, it can cause connection fault
and static electrical discharges.
• Do not drop or impose impact to the SCU module. It
can cause damage because the housing is made of
injection-molded plastics.
ATTENTION
Preventing PLC System Malfunctions
• Use an isolation transformer and line filter on the
incoming power to the PLC when there is equipment
using or producing high current, high voltage, or
large magnetic fields in the vicinity.
• Use analog sensor that meets the rated specifications
for module connection. Otherwise,
it may cause operation errors.
• Separate the main PLC power line ground from all
other power grounds. Always use class 3 grounding.
• Do not exceed the current and power rating of the
external 24 VDC provided by the PLC power supply.
• Avoid system faults due to programming errors by
reading and fully understanding this system manual
and the PLC instruction set.
• Perform regular preventive maintenance on installed
systems, checking devices and wiring for potential
breakdowns and failures.
