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有的還有PID指令，可對(duì)偏差制量進(jìn)行比例、微分、積分運(yùn)算，進(jìn)而產(chǎn)生相應(yīng)的輸出。計(jì)算機(jī)能算的它幾乎都能算。
這樣，用PLC實(shí)現(xiàn)模擬量控制是完全可能的?？刂频膯挝恢悼尚〉?/span>212分之一的測量程值，多數(shù)也是足夠的。
PLC進(jìn)行模擬量控制，還有A/D、D/A組合在一起的單元，并可用PID或模糊控制算法實(shí)現(xiàn)控制，可得到很高的控制質(zhì)量。
用PLC進(jìn)行模擬量控制的好處是，在進(jìn)行模擬量控制的同時(shí)，開關(guān)量也可控制。這個(gè)優(yōu)點(diǎn)是別的控制器所不具備的，或控制的實(shí)現(xiàn)不如PLC方便。
當(dāng)然，若純?yōu)槟M量的系統(tǒng)，用PLC可能在性能價(jià)格比上不如用調(diào)節(jié)器。這也是應(yīng)當(dāng)看到的。
【誠信經(jīng)營】【質(zhì)量可靠】【進(jìn)口原裝】【拆包防偽】
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JAMESBURY 6" CF8M VALVE 5152W-31-3600TS?-2 ACTUATOR ST-400 B W/ PMV P-2000
GEMINI VALVE, 1/2" NPT, 1000PSI CWP, PNEUMATIC VALVE & ACTUATOR, B412 / 89 6RTV6
RP&C 1/2" GATE VALVE 800 A105N
PARKER/SHRADER BELLOWS 200PSI, SELECTOR VALVE N1643003 *NEW*
MAC 1/8"NPT, 35-150PSI, PNEUMATIC SIGNAL PRESS VALVE 16001-111-111
WATTS 1-1/4", 200PSI, 10-35RANGE, LOW PRESSURE REGULATOR VALVE U5 B LP, 8214C *N
ASCO RED-HAT 110/120V 6.1/8.1W 50/60HZ 3/8" NPT SOLENOID VALVE, 8316G54 *NEW*
AQUATROL 1/2"NPT, 125PSI, VALVE 132
RP&C 1/2" GATE VALVE 800 A105N
PARKER/SHRADER BELLOWS 200PSI, SELECTOR VALVE N1643003 *NEW*
MAC 1/8"NPT, 35-150PSI, PNEUMATIC SIGNAL PRESS VALVE 16001-111-111
WATTS 1-1/4", 200PSI, 10-35RANGE, LOW PRESSURE REGULATOR VALVE U5 B LP, 8214C *N
ASCO RED-HAT 110/120V 6.1/8.1W 50/60HZ 3/8" NPT SOLENOID VALVE, 8316G54 *NEW*
AQUATROL 1/2"NPT, 125PSI, VALVE 132
NUMATICS 10BAR, 14.5-145PSIG PNEUMATIC VALVE L23JJ4520 *NEW,SEALED*
ASCO RED-HAT 110/120V 50/60HZ SOLENOID VALVE COIL, 238610-032D *NEW*
ROEMHELD CHECK VALVE CLR-2954-429-V / 2954429 *NEW*
SMC 1/4" NPT 15-150 PSI SHUT OFF VALVE, NVHS2000
BETTIS 120PSI ACTUATOR 106581 / RPB1000-SR4(CW)
ASCO SOLENOID VALVE REPAIR KIT, 158-927 *NEW*
VICKERS PRESSURE REDUCING VALVE DGMX2 3PA AWS40
WILDEN PRESSURE RELIEF SEAL KIT 99-9345-99 *NEW*
SMC REGULATOR VALVE VVS8080-22A NEW
SUN HYDRAULICS VALVE GCI 9KE3
SUN HYDRAULICS 30PSI, 2-PORT, NEEDLE VALVE NCCB-LCN *NEW*
WHITE RODGERS * GAS VALVE 120V 1 AMPS 60HZ * 2509A-254
SMC * BLANKING PLATE * VVQ2000-10A-1
JAMESBURY 4" - 5150 CLASS 150 CF8M VALVE ACTUATOR 150PSI ACTUATOR ST-200 B
NEWCO 8IN VALVE 12F-IB7 104099
FESTO GR-1/8B0 CONTROL VALVE 151215
UNKNOWN MFG * FAUCET VALVES 3/4"-20 300LB * -
APOLLO BALL VALVE 1000 PSI 3/8" CS
DYNAQUIP 3/8" BALL VALVE BRASS 600 WOG
WILKERSON 0-125PSIG 0-8,5BAR PNEUMATIC PRESSURE REGULATOR R09-02-FB00
SMC VFS2200-5FZB PILOT SOLENOID VALVE W BASE 0.1-1.0MPA NEW
2-1/2" FLANGE END PLATE F316L
ANDERSON GREENWOOD * M4AVS 6000PSI INSTRUMENT MANIFOLD * 02-2565-581
ASCO RED-HAT 110/120V 50/60HZ COIL, 96-817-1D *NEW*
SMC .05-.85MPA 3/4" PNEUMATIC REGULATOR VALVE AR40-04BG-X2182
VICKERS HYDRAULIC VALVE DG4V 5 521CJ M U H6 20
NUMATICS 24VDC .25A 150 PSIG-AIR SOLENOID VALVE W/ BASE, 082SA43AM000061 *NEW*
CENTERLINE BUTTERFLY VALVE SERIES 200 *NEW*
JAMESBURY ACTUATOR VPVL650 SR4/5 B C W/ QUARTZ POSITION SWITCH QX2VB02SDM
COAX 24VDC 1/2IN. NPT 0-100BAR COAXIAL VALVE 5-VMK-15-NC
FESTO 3-10BAR 45-145PSI SOLENOID VALVE MEBH-5/3E-D-1-Z?SR-C
DEZURIK 316 BODY/GATE/SEAT 150CWP 6" KNIFE GATE VALVE 9264112
ROVALVE 12" KNIFE GATE VALVE SS-2R
PARKER 110-120V 12.6W COMPLETE VALVE 12F23C2148ACFTR?05M *NEW, IN BOX*
FESTO 24V 4.5W 1/4 IN NPT 116 PSI SOLENOID VALVE W/ COIL, MFH-3-1/4-SA SER. E702
FESTO 24V 4.5W 1/4 IN NPT 116 PSI SOLENOID VALVE W/ COIL, MFH-3-1/4-SA SER. EN02
PARKER 3/4 NPT 24VDC COMPLETE VALVE 12F24C2248A3FPH?80
ASCO RED-HAT 1-1/4" NPT SOLENOID VALVE REPAIR KIT, 304691 *NEW*
TOYO-OKI HIROSE VAVLES HS3-1T-08A
CIRCLE SEAL 9259B-2PM 150 PSI 1/4" MALE PIPE VALVE, NNB SEALED
HAM-LET 1500 PSI 1/4" NPT THREE PIECE BALL VALVE, H-500-SS-L-1/4 *NEW*
WATTS THREADED BALL VALVE 1/2" BRASS 0152F
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