A／D单元是把外电路的模拟量，转换成数字量，然后送入PLC；D／A单元，是把PLC的数字量转换成模拟量，再送给外电路。作为一种特殊的I／O单元，它仍具有I／O电路抗干扰、内外电路隔离、与输入输出继电器（或内部继电器，它也是PLC工作内存的一个区，可读写）交换信息等等特点。
Agilestar - GP-XFP-1S - For Force 10 Networks - NIB
Agilestar - FTLF1519P1BNL-AS - For Finisar - New in Box
Agilestar - 10121 - For Extreme Networks - New in Box
Agilestar - 10G-XFP-SR - For Foundry Networks - NIB
Agilestar - 10GBASE-SR-XFP - Enterasys Networks - NIB
Agilestar - FTLF1621P2BTL-AS - For Finisar - New in Box
Agilestar - SFP-ZX - For Aruba Networks - NIB
Agilestar - 3CXFP94 - For use in 3Com - New in Box
Agilestar - XFP-10GE-SR - For Alcatel-Lucent - NIB
Agilestar - AT-G8ZX70/1470-AS - For Allied Telesyn - Ne
Agilestar - AT-G8ZX70/1490-AS - For Allied Telesyn - Ne
Agilestar - AT-G8ZX70/1510-AS - For Allied Telesyn - Ne
Agilestar - AT-G8ZX70/1530-AS - For Allied Telesyn - Ne
Agilestar - AT-G8ZX70/1550-AS - For Allied Telesyn - Ne
Agilestar - AT-G8ZX70/1570-AS - For Allied Telesyn - Ne
Agilestar - AT-G8ZX70/1590-AS - For Allied Telesyn - Ne
