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1. MADE BY- Trivendra Rana

2. PLC
Installation
1. Panel/Cabinet Installation
Consider PLC operation, maintenance,
and surrounding conditions when
installing the PLC in a panel or cabinet.
The operating temperature range for the
PLC is 0°C to 55°C. Be sure that there
is adequate ventilation for cooling;
• Allow enough space for air circulation.
• Do not install the PLC above equipment
that generates a large amount of heat,
such as heaters, transformers, or large
resistors.
• Install a cooling fan or system when the
ambient temperature exceeds 55°C
See the picture below;
The big PLC in panel
The small PLC in
panel

3. PLC
Installation
Power lines & high-voltage equipment can
cause electrical noise in the PLC ;
• Do not install the PLC in a panel or cabinet
with high-voltage equipment
• Allow at least 200 mm between the PLC and
nearby power lines
See the picture below;
Ensure that the PLC can be accessed
for normal operation and maintenance;
• Provide a clear path to the PLC for
operation and maintenance. High-
voltage equipment or power lines could
be dangerous if they are in the way
during routine operations.
•The PLC will be easiest to access if
the panel or cabinet is installed about 3
to 5 feet above the floor

4. PLC
Installation
2. Installing the CPU Unit & I/O Unit
The small PLC must be installed in the
position shown below to ensure adequate
cooling.
See the picture below;
Do not install the small PLC in either of the following
positions.

5. PLC Installation
The small PLC can be installed on a horizontal
surface or on a DIN track.
See the picture below ;
Lower the small PLC so that the notch on the
back of the PLC catches the top of the DIN Track.
Push the PC forward until the lock snaps into
place.
See the picture below ;

6. PLC
Installation
For the big PLC before installing, the Units
have to compiled one by one. There is no
single Unit that can be said to constitute a
Rack PLC. To build a Rack PLC, we start
with a Backplane. The Backplane for the
Omron PLC is shown below.
The Backplane is a simple device having two
functions. The first is to provide physical support for
the Units to be mounted to it.
The second is to provide the connectors and electrical
pathways necessary for connecting the Units mounted
to it. The core of the PLC is the CPU.
The CPU contains the program consisting of the series
of steps necessary for the control task. The CPU has a
built-in power supply, and fits into the rightmost
position of the Backplane.

7. PLC
Installation
The figure below shows one I/O Unit mounted directly to the left of the CPU.
I/O Units are where the control connections are made from the PLC to all the various input devices
and output devices. As you can see from the figure above, there is still some space available on the
left side of the Backplane. This space is for any additional I/O Units that may be required. The figure
below shows a total of eight I/O Units mounted to the Backplane.

8. PLC
Installation

9. PLC
Installation
Installing I/O devices
I/O devices are attached at the place have been determined
in the work plan and wiring diagram. For switches are usually
attached at the panel while the sensor, selenoid and motor is
usually placed at the machine to be controlled.
Wiring and connections
Duct Work
Hanging Ducts If power cables carrying more than 10 A 400
V, or 20 A 220 V must be run alongside the I/O wiring (that is,
in parallel with it), at least 300 mm must be left between the
power cables and the I/O wiring as shown below.

10. PLC
InstallationFloor Ducts If the I/O wiring and power cables must be placed in the same duct (for example, where
they are connected to the equipment), they must be shielded from each other using grounded metal
plates.
Conduits if Separating the PLC I/O lines, power and control lines, and power cables, as shown in the
following diagram.

11. PLC
Installation
I/O connections
Connect the I/O Devices to the I/O Units. Use 1.25-mm2 cables or larger The terminals have screws
with 3.5-mm diameter heads and self-raising pressure plates. Connect the lead wires to the terminals
as shown below. Tighten the screws with a torque of 0.8 N _ m.
If you wish to attach solderless type terminals to the ends of the lead wires, use terminals having the
dimensions shown below.

12. PLC
Installation
The following diagrams show the input
configurations. This input configuration
depend on specification of the Input Unit will
be used. See the specification before install.
The following diagrams show the output
configurations. This output configuration depend
on specification of the Output Unit will be used.
See the specification before install.

13. PLC
Installation
Power supply wiring
The following example show the proper way to connect the power source to the PLC. Use 1.25-
mm2 cables or larger. The terminal blocks have screws with 3.5-mm diameter heads and self-
raising pressure plates. For connecting to the terminal blocks, use round crimp terminals for 3.5-
mm diameter heads. Directly connecting stranded wires to the terminal blocks may cause a
short-circuit.
Power supply wiring on the Omron PLC

14. PLC
InstallationGrounding
This PLC has sufficient protection against noise, so it can be used without grounding except for
special much noise. However, when grounding it should be done conforming to below items. Ground
the PLC as independently as possible. Class 3 grounding should be used (grounding resistance
100Ω or less). When independent grounding is impossible, use the joint grounding method as shown
in the figure below (B). Use thicker grounding wire. Grounding point should be as near as possible to
the PLC to minimize the distance of grounding cable.
See the picture below;