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。
3020-ECM-RM Square D Ethernet Circuit Monitor 90/264V
Reliance 0-55325-81 circuit board NEW 802289-15A NOS
Reliance 0-57409-D PLC Analog Input Module NOS New
Russellstoll 3348 Plug Industrial 200A 250Vac/dc 4pin
OPTOFENCE STI OF4148-2FB2 48" w/ Controller +Manual New
Russellstoll Plug JPS2034H 200amp 250/600Vac Industrial
Akron Electric XJIHG1 Gas Transmitter Junction Box 3@
3RG6014-3AC00 Siemens Bero Sonar Sensor 20 30VDC New
EFSC2524J1 M83 Lock-Out Stop Switch Haz Location 125V
KIllark VPR10457 Receptacle 100A 4W4P 250DC 600AC
8903LO60V02 6 Pole Lighting Contactor Square D 120Vac
Industrial Motor Contact Kit 289-707 s/n 903639 NOS
Moore Circuit Board Link Module 1585318
Siemens Simatic 6ES5525-3UA11 Communication Module New
