12
1-2-2 CPU Unit and Expansion Unit
Up to 3 Expansion I/O Units or Expansion Units can be connected to a CPU Unit
with 30 or 40 I/O points.
There are three types of Expansion Units available: Analog I/O Units, Tempera-
ture Sensor Units, the CompoBus/S I/O Link Unit, and the DeviceNet I/O Link
Unit.
Expansion Connector
Expansion I/O Unit: Analog I/O Unit,
Temperature Sensor Unit, Compo-
Bus/S I/O Link Unit, or DeviceNet I/O
Link Unit
Expansion I/O Connecting Cable
A PC with 100 I/O points (the maximum) can be assembled by connecting three
Expansion I/O Units.
CPM1A-40CD-
(24 inputs, 16 outputs)
CPM1A-20EDR1
(12 inputs, 8 outputs)
× 1 Unit + × 3 Units = 60 inputs, 40 outputs
A PC with 6 analog inputs and 3 analog outputs (the maximum) can be as-
sembled by connecting three Analog I/O Units.
A PC with up to 6 temperature inputs for input from thermocouples or platinum
resistance thermometers can be assembled by connecting Temperature Sensor
Units.
CompoBus/S I/O Link Units (Slave Units) can be connected to a CPU Unit. I/O
data (8 inputs and 8 outputs) is transferred between the CPU Unit and the area
allocated to the CompoBus/S Slave. (The I/O data exchanged with the Slave is
internal data; there are no external input or output terminals.)
Up to three DeviceNet I/O Link Units can be connected to a CPU Unit. Each De-
viceNet I/O Link Unit enables using the CPM1A as a DeviceNet slave with 32
input and 32 output points.
Note Different types of Expansion Units can be connected at the same time. For ex-
ample, an Expansion I/O Unit, Analog I/O Unit, and CompoBus/S I/O Link Unit,
or an Expansion I/O Unit, Analog I/O Unit, and Temperature Sensor Unit can be
connected to the CPU Unit.
Expansion I/O Units
8-point Input Unit 8-point Output Unit20-point I/O Unit
System Configuration
Section 1-2
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