产品介绍：
4 路差分/8路单端A/D (0 ~ 20mA), 1路D/A (0 ~ 20 mA), 4 路D/O, 4 路D/I
The XW-board series are for uPAC-5000, LP-5000, and WP-5000 series.
One PAC can only plug only one XW-board.
The XW-board series have following common specification:
DI channel is dry contact, sink type.
DO channel is open collector, sink type.
