任何一个连接到串口的设备都需要+5V的DC电源，该直流电源是由系列90-30电源模板提供的，在这里必须考虑计算大功率的消耗(参看第12章中标题为“电源模板容量计算”相关部分)。所有的系列90-30 CPU都安排有串口，352和363型CPU还有附加的串口，在本章下面的章节当中将有相关说明.当心在连接此串口过程中必须注对共电压的规范3要求

HONEYWELL M744T1012 MODUTROL MOTOR, NIB

ALLEN BRADLEY 800P-S1R2A SERIES E 600 VOLTS PALM OPERAT

PARKER K065 N035 PILOT VALVE, NNB

ASHCROFT Q-4814 0-100 PSI DURAGAUGE, NNB

GLOBAL INDUSTRIAL EQUIPMENT WTCX223 1″ WEIR STYLE DIAPH

BRADY PSPT-250-1W PERMASLEEVE LABEL, NIB

ALLEN BRADLEY 1-POLE 2A CIRCUIT BREAKER 1489-A1C020 AB-

WEIDMULLER POWER SUPPLY 991824

SQUARE D H321NRB SAFETY SWITCH, NIB

SIMPLEX 742-509 RED LED MODULE, NNB

TELEMECANIQUE 80A CONTACTOR LP1 D6511 W/ LR2 D35 & LR2

TELEMECANIQUE 480VAC 15HP SOILD STATE STARTER LH4N125RT

TELEMECANIQUE 125A 24V COIL CONTACTOR LP1 D8011 W/LA1 D

NEMIC-LAMBDA 24V 4.2A DC POWER SUPPLY EWS100P-24

EDP SonaSwitch 16XXS ULTRASONIC PROXIMITY SENSOR 16XXS