Toshiba PA912 - Types of I;O Base Units

Chapter 2 Installation and Wiring
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2.1 Types of I/O Base Units
The PA912 module is installed to the I/O base unit (hereinafter "base unit")
(BU90A).
For the specifications of the I/O base unit, refer to "Appendix A.2 PA912 and
BU90A Specifications."