但是在检查输出信号时就要格外小心了。如果是电驱动产品,必须在安全情况下,尤其是保证设备不会发生撞击前提下,让执行机构的驱动器得电,检查执行机构是否能够运动。如果是液压或气动执行机构,同样在安全情况下手动使换向阀得电,从而控制执行机构。在检查输出信号时,不论执行机构的驱动方式是什么,一定要根据元件说明书,首先要保证设备和人身安全,要注意并不是所有设备的执行机构都可以通电测试的,所以有时个别的输出信号可能无法手动测试。
无论是输入还是输出装置,当传感器有信号或执行机构的驱动装置得电后,必须同时检查PLC上的I/O模块指示灯是否也点亮。很多设备中,输入输出信号是通过接线端子与PLC连接,有时接线端子的指示灯有信号 ,但不能保证由于连接导线内部断路,而PLC上相应的地址没有信号接通。这一点要特别注意。
在测量输入输出信号后,要同时将测量的地址记录下来,保证信号地址和说明书中一致。如有不同,再次测量设备地址,多次测量仍然不一致,先联系设备厂家,因为此时不能保证厂家提供的地址没有错误。
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MAGNETEK ELECTRIC MOTOR P/N 9-391322-64 HP 3 RPM 1760 230/460V NEW
ASCO SOLENOID VALVE EF8340G002 NEW IN BOX
ConSTRUCTION SPECIALTIES ELECTRIC MOTOR DRIVE EX-110 NEW
ABB AV1123000 PNEUMATIC VALVE POSITIonER NEW
GENERAL ELECTRIC CIRCUIT BOARD 125D458BAG2-H2 REPAIRED
HonEYWELL HVAC PLUS 2 CHAN ANAL REPLACEMENT KIT 51198066-501 NEW
HOLOPHANE 1000 WATTS BALLAST ASSY HMSC10HPMT NEW IN BOX
METTLER TOLEDO KOP PROFIBUS KIT 14866600A NEW IN BOX
KENCO LEVEL GAUGE MLC-C-13.781 NEW
BENTLY NEVADA KEYPHASOR 126648-01 I/O MODULE NEW
BOWMAR ANALOG PANEL METER 500VV0105H NEW
FIREYE SOLID BURNER MANAGEMENT SERIES D TYPE 70D30 NEW
BESTOBELL INVERTED STEAM TRAP 1'' NPT MODEL 1B41V NEW
ITT SKOTCH DOUBLE BLOCK + VENT VALVE SYSTEM T4106C NEW
SQUARE D FLOAT SWITCH CLASS 9037 TYPE HW-33 SER. A NEW
FOSSIL AQUARIAN 3000 P/N 7900-1007-03 NEW
CUTLER HAMMER SOLID STATE RELAY 506C084G09 NEW IN BOX
TEMPCO CAST ALUM HEATER ELEMENT CBH04658 1000W NEW
FISHER GAS REGULATOR HSR-BBBBMYN NEW
ABB BACKPLANE CIRCUIT BOARD 32628 REV 03 NEW
DURCO 12CX103 8649 SNAP SWITCH NEW
REXROTH 3-WAY POPPET SOLENOID OPERATED VALVE R900570174 NEW
SIEMENS I-P TRANSDUCER 77-16 NEW
FISHER VALVE POSITIonER DVC5010 NEW IN BOX
NEWPORT ELECTRonICS PROCESS METER P6030 NEW IN BOX
FISHER SIM.SM,DEV/AN.OUT 12P0268X012 CL6885X1-A1 NEW IN BOX
THERMON SSR15C TEMPERATURE ConTROLLER NEW
ALLEN BRADLEY 1305-AA08A DRIVE 2H.P. USED
ROSEMOUNT MODEL 81 TWO WIRE MODEL # 0081 PH/ORP-01 NEW
EATON ConNECT UPS WEG/SNMP CARD P/N 116750222-001 NEW IN BOX
CUTLER HAMMER LIMIT SWITCH 10316H1049C NEW
IFM EFECTOR INC. TYPE IG-2005-ABOA INDUCTIVE PROXIMITY SWITCH NEW
ASHCROFT TRANSDUCER w/ SST DIAPHRAGM MODEL # K1 NEW
AMETEK CIRCUIT BOARD # TP100 200.0474-A NEW
AMETEK TFL30 LEVEL TRANSMITTER NEW
CUTLER HAMMER MCC BUCKET w/ SIZE 4 STARTER & 150 AMP BREAKER USED
COOPER BUSS FUSE FRS-R-200 NEW IN BOX
CUTLER HAMMER FREEDOM 2100 MOTOR ConTROL CENTER 3 SECTIONS NEW
LABPETTE PRECISION VARIBLE VOLUME SINGLE PIPETTE P3940-100 NEW IN BOX
MACRO SENSORS MODEL # SQ1250-2000 TRANSDUCER NEW
FISHER VALVE CAGE 39A9059X032 NEW