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1-3
Section
Expansion I/O Units
10-point Expansion I/O Unit
(relay outputs)
24-point Expansion I/O Unit
(transistor outputs)
Unit
Inputs
Outputs
Model
10 I/O points
6 inputs, 4 outputs
I/O terminals
6 inputs (24 VDC)
4 relay outputs
CPM2C-10EDR
24 I/O points
16 inputs 8 outputs
I/O connector
16 inputs (24 VDC)
8 transistor outputs
(sinking)
CPM2C-24EDTC
16 inputs, 8 outputs
8 transistor outputs
(sourcing)
CPM2C-24EDT1C
Note Be sure that the power supply requirements of the CPU Unit and Expansion I/O
Units do not exceed the available capacity. Only three Expansion I/O Units can
be connected when the NT-AL001 Adapter connected to the RS-232C port.
1-3
Structure and Operation
1-3-1 CPU Unit Structure
The following diagram shows the internal structure of the CPU Unit.
External
input
devices
I/O memory
Program
PC Setup
Commu-
nications
ports
Settings
Settings
Settings
External
output
devices
Communications
switches
Input
c
irc
ui
ts
Out
put
c
irc
ui
ts
The program reads and writes data in this memory area during execution. Part of
the I/O memory contains the bits that reflect the status of the PC’s inputs and
outputs. Parts of the I/O memory are cleared when the power is turned ON and
other parts are retained.
Note Refer to
Section 3 Memory Areas
in the
Programming Manual
(W353) for more
details on I/O memory.
I/O Memory
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