PLC系统的模拟量是一个变动很大的不稳定的值,可能是如下原因:
你可能使用了一个自供电或隔离的传感器电源,两个电源没有彼此连接,即模拟量输入模块的电源地和传感器的信号地没有连接。这将会产生一个很高的上下振动的共模电压,影响模拟量输入值。
另一个原因可能是模拟量输入模块接线太长或绝缘不好。
可以用如下方法解决:
1) 连接传感器输入的负端与模块上的公共M 端以补偿此种波动。(但要注意确保这是两个电源系统之间的**联系。)
背景是:
模拟量输入模块内部是不隔离的;
共模电压不应大于 12V;
对于60Hz干扰信号的共模抑制比为40dB。
2)使用模拟量输入滤波器。
联系人:林工
电话:0591-22983857 ;手机:17705012279
e-mail:zkdzwg@163.com
QQ:879520885
WECO TECHNIEK TRANSFORMER SCHEID 971084,
50/60HZ, 110-575V, 21-24-27V, 4-2A
WECO TECHNIEK TRANSFORMER UL/CSA
WEED INDUSTRIAL ETHERNET RING SWITCH
2104-57
WEG 00158ES3ED56C ENERGY EFFICIENCY MOTOR
FRAME D56C RPM 1730 208-230/460V
WEG 00158OT3E145T-S NEMA PREMIUM EFF.
GENERAL PURPOSE MOTOR, 1.5HP, 3PH, 1760RPM
WEG 00236EP3ER145TC
WEG 00236EP3ER145TC
WEG 5018ES3EB56C 1/2HP 3PH 208-230/460V
60HZ 1750RPM
WEG 5HP 3 PHASE ELECTRIC MOTOR 208-230/460V
60HZ 1755 RPM
WEG AL63-04 HIGH EFFINCIENCY MOTOR 1700RPM,
60HZ, .25HP, 460V, CODE J
WEG MOTOR 00336ES3EF56HC 2.2 HP 3 PHASE
3450 RPM 208-230/460V
WEG MOTOR 3PH 60HZ 575V 2.97A 3460RPM
CT003502NPW221457
WEG MOTOR 3PH 60HZ 575V 2.97A 3460RPM
CT003502NPW221457
WEG MOTOR 3PH 60HZ 575V 2.97A 3460RPM
CT003502NPW221457
WEG MOTOR 3PH 60HZ 575V 2.97A 3460RPM
CT003502NPW221457
WEG MOTOR CC029A 3PH 60HZ 575V 2.80A
3430RPM
WEG MOTOR CC029A 3PH 60HZ 575V 2.80A
3430RPM
WEG NEMA PREMIUM 001560T3H143T, 1.5HP
WEG NEMA PREMIUM 001560T3H143T, 1.5HP
WEG PREMIUM EFFICIENCY E149/5T 1HP
WEG W21 SEVERE DUTY MODEL 00718P3E213T
7.5HP SHAFT 1"
WEIDMULLER CONNECTPOWER PRO-M N1692 POWER
SUPPLY
WEIDMULLER PLOTTER IP-220
WEIDMULLER POWER SUPPLY CSA950 115/230VAC
24VDC
WEISS INSTRUMENTS 554-20 0-160 PSI GAUGE
WEISS INSTRUMENTS 554-29 0-400 PSI GAUGE
WEKSLER INSTRUMENTS VACUUM/PRESSURE GAUGE
WEKSLER INSTRUMENTS VACUUM/PRESSURE GAUGE
WELCH DUO-SEAL VACUUM PUMP 1400, 2STAGE 1PH
WESTERN DIGITAL HARD DRIVE 2060-771665-000
LOT OF 12
WESTERN ENTERPRISES COMPRESSED GAS FITTINGS
T-92
WESTINGHOUSE 1341766-A OVERCURRENT RELAY
WESTINGHOUSE 1461C56G AMPLIFIER
WESTINGHOUSE 149D866G03 M300 AC ISOLSTION
TRANSDUCER
WESTINGHOUSE 6052D22G01 PULSE AMPLIFIER
WESTINGHOUSE 6052D22G01 PULSE AMPLIFIER
WESTINGHOUSE 8 POLE SPRING OPERATED SWITCH
WESTINGHOUSE 9966D32 IQ 1000 STYLE MOTOR
PROTECTION RELAY
WESTINGHOUSE CIRCUIT BREAKER GMCP030H1C,
30AMP 3POLE 277/480VAC
WESTINGHOUSE CIRCUIT BREAKER KA3225F 225A 3
POLE 600VAC
WESTINGHOUSE DAL-042-38 OIL FLOW INDICATOR
WESTINGHOUSE DAL-042-60 FLOW INDICATOR
WESTINGHOUSE DAL-042-60 FLOW INDICATOR
WESTINGHOUSE ELECTRONIC TIMER TRON1B120A
120VAC 10A WITHOUT BASE
WESTINGHOUSE ELECTRONIC TIMER TRON1B120A
120VAC 10A WITHOUT BASE
WESTINGHOUSE ELECTRONIC TIMER TRON1B120A,
120VAC, 10A
WESTINGHOUSE KA-241 PANEL METER
WESTINGHOUSE M300 FORCING ALARM
WESTINGHOUSE MA3800F 3 POLE 800A CIRCUIT
BREAKER
WESTINGHOUSE METAL CLAD SWITCH GEAR
416D200G62
WESTINGHOUSE SERIES C CIRCUIT BREAKER 30A
FDB3030L
WESTINGHOUSE SERIES C CIRCUIT BREAKER 30A
FDB3030L
WHITE RODGERS 3535Z-52 SOLENOID VALVE W/
COIL ASSBLY
WHITE ROGERS 24A05E-1 LEVEL TEMP SILENT
OPERATOR
WHITE-RODGERS F29-0233 THERMOSTAT GUARD
WIELAND SNE 4004K SAFETY RELAY
WIKA 213.53 2.5"dia -30inHg to 60PSI -
1/4"NPT CBM NIB
WIKA GAUGE VA07077
WIKA PSI GAUGE 316 SS 0-400PSI
WIKA SICHERHEITSGLAS 0-1500PSI 316 SS
PRESSURE GAUGE
WILDEN P.025/AMPPP/BNS/TF/ABN DIAPHRAGM
PUMP, 1/4"
WILKERSON PRESSURE REGULATOR R03-02-000 300
PSI MAX
WILKERSON PRESSURE REGULATOR R03-02-000 300
PSI MAX
WILKERSON R03-02-000 PRESSURE REGULATOR 300
PSI MAX
WILKERSON R21-02-000B-M02 REGULATOR, RANGE
0-160 PSI
WILKERSON RRP-95-131 REPAIR KIT ***LOT OF
2***
WILKERSON V08-02-0000 LOCKOUT VALVE
Williamson 115VAC Remote Temperature
Digital Display 8120LT
WINSMITH 926MDTE SPEED REDUCER PART #
926MDTE064XGB7
WINSMITH 926MDTE SPEED REDUCER PART #
926MDTE064XGB7
WINSMITH 926MWU D90-SE
WINSMITH D-90 917MDSF 10:1 RATIO
WINSMITH SPEED REDUCER- 935CDVE44000A8
***NIB***
WINSYSTEMS PCM-UIO48A-8 UNIVERSAL
WINSYSTEMS PCM-UIO48A-8 UNIVERSAL
WITTENSTEIN ALPHA 140S-MC1-4 LOW BACKLASH
PLANETARY GEARHEAD
WOHNER BUSBAR ADAPTER 6032 690V
WOODHEAD CONNECTIVITY/BRAD HARRISON P/N
CC4030A48M090, 800V, 25A
WOODS AIR MOVEMENT JW130022
WOOD'S E-TRAC AC INVERTER XFC4001-0B,
380-460V, 50/60HZ, 3PH, 2.3AMPS
WORCESTER CONTROLS, ACCESS, MODEL 201,
PNEUMATIC ACTUATOR
WORLDWIDE ELECTRIC WSS1-36-56CB, 1HP,
208-230/460V, 3470RPM, 56C/TEFC ENCLOSURE
WORLDWIDE HdRF-175-50/1-R-56C SPEED REDUCER
WORM GEAR ACTUATOR M1801-11