BERGER-LAHR WDP5-118.05100
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如果采样周期太大,积分计算将会产生很大的误差。以下图为例,误差等于绿色的给定值减去红色的过程变量。图中灰色的面积是各区间误差积分的增量值。注意积分是有正负的。举一个比较***的例子,如果采样周期约等于过程变量衰减振荡的半周期,并且在误差近似为0的点作PID运算,在各采样点计算出的积分增量近似为0,比例部分和微分部分也近似为0,PID的输出值基本上保持不变!
当然实际的PID控制不会这样巧,但是当采样周期过大时,计算出来的积分分量和微分分量会有很大的误差。这样的PID控制当然会失控,怎么调节PID的参数都没有用了。
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ALLEN BRADLEY 140M-I8E-D16 SERIES A CIRCUIT BREAKER (MPCB) 65KA/480V
ALLEN BRADLEY 1485P-P4T5-T5 SERIES A DEVICENET BOX THICK ROUND MEDIA
ALLEN BRADLEY 2090-SCEP5-0 SERIES A CABLE ENCLOSURE ONLY JACKET 5.0M
ALLEN BRADLEY 1492-CB2G100 SERIES C CIRCUIT BREAKER 10 AMP2 POLE
ALLEN BRADLEY 800T-QH10G SERIES T PILOT LIGHT TYPE413 FULL VOLTAGE
ALLEN BRADLEY 836T-T252JX81X1?5 SERIES A PRESSURE CONTROL SWITCH 600V
ALLEN BRADLEY 1792D-8BVT0D SERIES B 8 SINK/SOURCE INPUTS 4 CONNECTORS
ALLEN BRADLEY 1792D-8BVT0D SERIES B 8 SINK/SOURCE INPUTS 4 CONNECTORS
ALLEN BRADLEY 1771-P7B SERIES B POWER SUPPLY MODULE 16AMPS 120/220VAC
ALLEN BRADLEY 1771-IAD/C SERIES C INPUT MODULE AC/DC .25AMP 120V 16
ALLEN BRADLEY 1771-IADB SERIES B INPUT MODULE AC/DC .25AMPS 120V 16
ALLEN BRADLEY 440R-G23110 SERIES GUARD MASTER MONITORING SAFETY RELAY
ALLEN BRADLEY 1734IB4 SERIES C 4 CHANNEL SINK INPUT MODULE 24V/DC
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ALLEN BRADLEY 2727-MRC1 SERIES A DOWNLOAD CABLE 4M(13.1FT)
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ALLEN BRADLEY 20-COMM-C SERIES B POWERFLEX CONTROLNET ADAPTER
ALLEN BRADLEY 800T-Q12A SERIES T PILOT LIGHT 30.5MM TYPE 4/13
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ALLEN BRADLEY 800T-Q12G SERIES T PILOT LIGHT FULL VOLTS 12V GREEN LEN
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ALLEN BRADLEY 855H-BA10ED SERIES A AUDIBLE SIGNALING DEVICE
ALLEN BRADLEY 1771-IQ16 SERIES C PLC5 INPUT MODULE ISOLATED 24 VDC
ALLEN BRADLEY 1394C-AM07 SERIES C AC SERVO CONTROLLER AXIS MODULE 5KW
ALLEN BRADLEY 1494V-DHL611 SERIES B FUSIBLE DISCONNECT SWITCH KIT
ALLEN BRADLEY 2727-MRT20 SERIES A CONNECTION CABLE 20 M (65.6 FT)
ALLEN BRADLEY 1485P-P8T5-T5 SERIES A DEVICEBOX 8 PORT DEVICENET
ALLEN BRADLEY 800T-Q12R SERIES T PILOT LIGHT TYPE 413 FULL VOLTAGE
ALLEN BRADLEY 140U-K3D3-D35 SERIES A CIRCUIT BREAKER (MCCB) ASSEMBLY
ALLEN BRADLEY 140M-18E-C80 SERIES A CIRCUIT BREAKER (MPCB) 65 KA/480V
ALLEN BRADLEY 1494V-DH666-A-D?-E-F SERIES 1 FUSIBLE DISCONNECT SWITCH
ALLEN BRADLEY 592-BOW169 SERIES A MANUAL RESET OPEN TYPE CTRL CIRCUIT
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ALLEN BRADLEY 889N-F5AF-12F SERIES A 5 POLE SINGLE ENEDED MINI FEMALE
ALLEN BRADLEY 802M-AZJ5LF SERIES A LIMIT SWITCH VOLTS AC 5-24
ALLEN BRADLEY 800T-D2JB SERIES T PUSH BUTTON JUMBO MUSHROOM HEAD BLACK
ALLEN BRADLEY 520F-B0J-A1G-A1?G SERIES W MULTI-SPEED STARTER CONSTANT
ALLEN BRADLEY 800T-J91 SERIES T SELECTOR SWITCH 10 AMPS 600VAC 3
ALLEN BRADLEY 42BT-B2LBSL-Y4 SERIES A PHOTOSWITCH 4 POLE MALE 12-24VD
ALLEN BRADLEY 1734-IE2V SERIES C OUTPUT MODULE ANALOG SOURCE 24VDC
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ALLEN BRADLEY 194-L-E16-1753 SERIES A IEC CONTROLAND LOADS SWITCH
ALLEN BRADLEY 800T-KC2AAXX SERIES T NON ILLUMINATED PUSH BUTTON 30.5M
ALLEN BRADLEY 700-PC40 SERIES A 700-P 3RD LEVEL ADDER DECK 4 POLE 10
ALLEN BRADLEY 898N-43PB-N4 SERIES A 4 POLE MALE/FEMALE T-CONNECTOR
ALLEN BRADLEY 871ZT-MB5NP18-D?4 SERIES A PROXIMITY SWITXH INPUT 10-30VD
ALLEN BRADLEY 871ZT-NB20NP30-?D4 SERIES A PROXIMITY SWITCH INPUT 10-30V
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ALLEN BRADLEY 1492-CB2G500 SERIES C MINIATURE BREAKER 2 POLE 50A
ALLEN BRADLEY 1492-CB2G300 SERIES C 2 POLE 30A 10HP AC 480Y/277V 1PH
ALLEN BRADLEY 871TM-DH10NP30-?N4 SERIES A INDUCTIVE PROXMITY SENSOR
ALLEN BRADLEY 871A-TS5-N1 SERIES A QUICK DISCONNECT CHAMBER TERMINAL
ALLEN BRADLEY 871TM-DH2NP12-N?4 SERIES A INDUCTIVE PROXIMITY SENSOR
ALLEN BRADLEY 440G-A27143 SERIES A GUARDMASTER ACTUATORS GD2
ALLEN BRADLEY MPL-B4530K-MJ22?AA SERIES A SERVO MOTOR 3.5 HP 3 PHASE
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ALLEN BRADLEY 1792D-2BV0D SERIES B ARMORBLOCK MAXUM 2 INPUT MODULE
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ALLEN BRADLEY 2727-MREX1 SERIES A JUNCTION BOX CABLE 2M (6.6 FT)
ALLEN BRADLEY 871C-A10N30-N3 SERIES A INDUCTIVE PROXIMITY SENSOR
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ALLEN BRADLEY 800R-1TAM SERIES T STATION ASSEM PUSH BUTTON 600V AC MAX
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ALLEN BRADLEY 1494R-N10 SERIES A DISCONNECT SWITCH ACCESSORY
ALLEN BRADLEY 1492-CB2G150 SERIES C ENERGY LIMITING MINIATURE CIRCUIT