OMRON C500-NC103-E PLC
OMRON C500-NC103-E PLC
tional Backplane. First, though, we have to mount an I/O Control Unit to the
leftmost slot of the CPU Rack.
I/O Control Unit
Now we can use a cable to connect the CPU Rack to another Backplane.
This Backplane has a Power Supply and I/O Units mounted to it, but it has no
CPU of its own. The additional Backplane must also have an I/O Interface
Unit mounted to its leftmost position. This configuration of additional Back
plane, Power Supply, I/O Units, and I/O Interface Unit is called an Expansion
I/O Rack.
CPU Rack
Expansion I/O Rack
I/O Interface Unit
The CPU Rack and Expansion I/O Rack shown above are connected by a
cable. Remember that this whole configuration is still referred to as one PC.
It is possible to keep adding Expansion I/O Racks in this way until the maxi
mum number of I/O points for the system is reached. Each Expansion I/O
Rack needs an I/O Interface Unit.
Memory Packs
The CPU has a removable Memory Pack that stores the user program. Two
Memory Packs are available, in either RAM or ROM. You can write your own
program into the RAM Pack or you can copy a program that has already
been written to an EPROM chip and mount it in the ROM Pack. The EPROM
Chip must be mounted to the PROM Writer in order for the program to be
written to it. Then the EPROM Chip must be mounted to the ROM Pack.
Depending on the amount of memory required for your application, use 1. 2.
or 3 chips. Refer to Appendix B Specifications for specifications of the
EPROM chips.
Using the diagram and the table below as a reference, mount the EPROM
chips to the correct IC sockets
Take the following steps to install the Memory Pack in the CPU.
Turn the power to the PC OFF
Using a standard screwdriver, remove the Memory Pack compartment
cover located on the front panel of the CPU. Push in the latch on the
cover and slide the cover upward
Insert the Memory Pack (component side facing left) into the Memory
compartment. When the Unit is almost completely inserted into the CPU,
there may be a slight resistance as the Memory Pack connector mates
with the connector inside the CPU. Continue pushing on the Memory
Pack until it is inserted completely into the CPU.
Follow the steps below to remove the Memory Pack from the CPU.
Turn the power to the PC OFF.
Using a standard screwdriver, remove the Memory Pack compartment
cover located on the front panel of the CPU. Push in the latch on the
cover and slide the cover upward.
Pull the Memory Pack up and out
System Configurations
The following figure shows an assembled C500 CPU Rack and one Expan
sion I/O Rack. When three Expansion I/O Racks are connected to a CPU
Rack, a maximum of 512 I/O points are available. (Include the Remote I/O
Units)
The table below summarizes the Units that can be used in the systems de
scribed in this manual.
Special I/O Units
The number of Special I/O Units that can be used depends
upon the number of points available and the number of
points the Special I/O Unit requires.
Host Link Units
Up to one Host Link Units can be mounted. Only one
Rack-Mounting Host Link Unit can be mounted to the CPU
Rack. A CPU-Mounting Host Link Unit can also be mounted
directly to the CPU. Host Link Units cannot be mounted to
Expansion I/O Racks.
However, these Units cannot be mounted when the
SYSMAC Net Link Unit is mounted.
I/O Units
Standard I/O Units are available with 16. 32. or 64 points.
Refer to Section 2 Description of All Components for details.
Memory Packs
RAM or ROM Packs are available. The ROM Pack requires
a separately available EPROM chip.
Remote I/O Master
Unit
Up to four Remote I/O Master Units can be mounted to both
the I/O Rack and the Expansion I/O Racks. When the
Remote I/O Unit is mounted to a Rack, a Rack number must
be set so that the CPU can identify the Remote I/O Unit.
Mount the Remote I/O Slave Unit to the leftmost position
(the I/O Interface Unit position) on the Slave Rack. For
details, refer to the C500 Operation Manual.