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Application Precautions 5
• Be sure that all the terminal screws are tightened to the torque specified
in the relevant manuals. Loose screws may cause fire, malfunction, or
damage the Unit.
• Be sure that all the mounting screws and cable connector screws are
tightened to the torque specified in the relevant manuals.
• Be sure that all the communications connector screws are tightened
securely. (The communications connector screw torque is 0.5 to
0.6 N·m.)
• Use the correct wiring components when wiring.
• Use crimp terminals for wiring. Do not connect bare stranded wires
directly to terminals.
• Double-check all wiring before turning ON the power supply.
• When wiring or performing other tasks, do not allow metal objects such as
wire strands to enter the Unit.
• Always follow the electrical specifications for terminal polarity, communi-
cations path wiring, power supply wiring, and I/O jumpers. Incorrect wiring
can cause failures.
• Always wire the Unit as shown in the manual.
• Be sure to press terminals until they are fully seated.
• Mount Units only after checking terminal blocks completely.
• Before mounting a wired terminal block to the main block, be sure that the
terminal block-main block combination is correct.
• Be sure that the communications cable connectors and other items with
locking devices are properly locked into place.
• Do not drop the Unit or subject the Unit to excessive vibration or shock.
Doing so may cause malfunction or damage to the Unit.
• Use the special packing box when transporting the Unit. Ensure that the
product is handled carefully so that no excessive vibration or impact is
applied to the product during transportation.
• Check the user program for proper execution before actually running it
with the system.
• Do not bend or pull the cables excessively.
• When connecting communications cables, always turn OFF the PLC
power supply, all Slave power supplies, and all communications power
supplies.
• Observe the following precautions when wiring the communications
cables.
• Wire the communications cables separately from the power lines or
high-tension lines.
• Do not bend the communications cables excessively.
• Do not pull on the communications cables excessively.
• Do not place objects on top of the communications cables.
• Route communications cables inside ducts.
• Always enable the scan list before operation.
• Before clearing the scan list of a Unit that has user-allocated remote I/O,
always confirm that no errors occur after the I/O Area setting is changed
to fixed allocation.
• When adding a new node to the network, check that the new node’s baud
rate is the same as the baud rate set on the other nodes.
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