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Definitions for Lambda 21B and Lambda 21A ports are basically the same; therefore, the
following content introduces port definitions for the Lambda 21B controller as an example.
Multiple EX31A extension terminal boards can be connected to the Lambda 21B controller
to meet your needs.
The port definitions are shown below:
2.1.3 EX31A
Select extension terminal boards based on your needs.
EX31A: Supports 10-channel input and 10-channel output