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
ENCORP GPC 003-51 REV A BOARD
BENTLY NEVADA 3300/05 SYSTEM POWER SUPPLY RACK
ECONO LIFT TR20 PORTABLE BOX TILTER
HAYWARD STI02094 VALVE
EM Electronic Measurements TCR20T250-1 Power Supply
15 GOULD ITE UNIVERSAL LIGHTING DUCT TPG312-3S
LIFT-RITE L50 PALLET JACK 5000LBS 42'' WIDE
350 ASYST TECHNOLOGIES 6002TD000200 DUAL GEAR ADJUSTER
Solomat MPM 2000 Modumeter
AUTONETICS T/E CHAMBER HEAT FURNACE
PULIZZI PC726-D-2482 POWER DISTRIBUTION UNIT
BRANSON 222-100-016 REV122 LASER MODULE INTERFACE
SIEMENS FXD63B250 ITE CIRCUIT BREAKER
HONEYWELL R7248A1004 INFARED AMPLIFIER
REX EC4434 P80226 STEEL WELDED CHAIN
5000 CONCORD ELECTRONICS 10-916-3-03 P.C. GOLD PIN .04
Syntron EB-192-A Magnetic Parts Feeder Bowl 21''
BENTLY NEVADA 3300/20 DUAL THRUST MONITOR
Com-ten 922 MT-20 Force System
6 HEAVY DUTY INDUSTRIAL HUB BEARINGS
是PLC工作内存的一个区，可读写）交换信息等等特点。
