描述
梯形图中输入继电器的状态只取决于对应的外部输入电路的通断状态，因此在梯形图中没有输入继电器的线圈。输出线圈只对应输出映像区的相应位，不能用该编程元件直接驱动现场机构，位的状态必须通过I/O模板上对应的输出单元，才能驱动现场执行机构进行最后动作的执行。
DAYTON URT8618 480 Volt 50KW UNIT HEATER 170,500 BTU
JACUZZI EH85969 72″FIBERGLASS WHIRLPOOL CENTER DRAIN
BERK-TEK 10033023 8162’SPOOLED FIBER OPTIC CABLE 140158
DAY AND NIGHT PHX336000L00A1 3T ROOFTOP AIR CONDITIONER
DAY AND NIGHT PHX336000L00A1 3T ROOFTOP AIR CONDITIONER
PORT-A-COOL PAC2K482S EVAPORATIVE FAN 1 HP 146406
JAMESBURY 815W3600TT/GO 10″ BUTTERFLY VALVE 58228
ELKAY ECH81J 115 VOLT REMOTE WATER CHILLER 160849
THERMO SCI 335900AP000 GEN 10 VIS W/OUTPUT PRINTER
BLACK BOX AC1051A CAT5 VIDEO MATRIX SWITCH 159872
SUMITOMO ELECTRIC SE-3NK096A 2862′ 96-STRAND CABLE
CIECOR OPTICAL 060X81-T-31XX24 FIBER OPTIC CABLE 154395
