Setup & Operation 12. Option Units
72 RC180 Rev.17
12. Option Units
12.1 What are Option Units?
The option units contain option boards for RC180.
Up to two units can be installed on one Controller. Up to four option boards can be
installed.
The types of the option boards are as follows.
12.2 Expansion I/O Board
12.3 Fieldbus I/O Board
12.4 RS-232C Board
12.2 Expansion I/O Board
12.2.1 About Expansion I/O Board
Install an option unit in the Controller when extra inputs or outputs are desired.
Each additional expansion I/O board provides 32 inputs and 32 outputs.
CN1: 16 inputs / 16 outputs
CN2: 16 inputs / 16 outputs
The number of I/Os that can be expanded is maximum 4 boards and 128 inputs and
outputs.
The input and output bit numbers are assigned as follows. (Bit number is assigned from
CN1.)
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