1756-OX8I/AB智能制造
同時(shí)還要有模擬量輸入單元(A/D),把這些標(biāo)準(zhǔn)的電信號(hào)變換成數(shù)字信號(hào);模擬量輸出單元(D/A),以把PLC處理后的數(shù)字量變換成模擬量——標(biāo)準(zhǔn)的電信號(hào)。
所以標(biāo)準(zhǔn)電信號(hào)、數(shù)字量之間的轉(zhuǎn)換就要用到各種運(yùn)算。這就需要搞清楚模擬量單元的分辨率以及標(biāo)準(zhǔn)的電信號(hào)。例如:
PLC模擬單元的分辨率是1/32767,對(duì)應(yīng)的標(biāo)準(zhǔn)電量是0—10V,所要檢測(cè)的是溫度值0—100℃。那么0—32767對(duì)應(yīng)0—100℃的溫度值。然后計(jì)算出1℃所對(duì)應(yīng)的數(shù)字量是327.67。如果想把溫度值精確到0.1℃,把327.67/10即可。
模擬量控制包括:反饋控制、前饋控制、比例控制、模糊控制等。這些都是PLC內(nèi)部數(shù)字量的計(jì)算過(guò)程。
3、脈沖量是其取值總是不斷的在0(低電平)和1(高電平)之間交替變化的數(shù)字量。每秒鐘脈沖交替變化的次數(shù)稱為頻率。
PLC脈沖量的控制目的主要是位置控制、運(yùn)動(dòng)控制、軌跡控制等。例如:脈沖數(shù)在角度控制中的應(yīng)用。步進(jìn)電機(jī)驅(qū)動(dòng)器的細(xì)分是每圈10000,要求步進(jìn)電機(jī)旋轉(zhuǎn)90度。那么所要?jiǎng)幼鞯拿}沖數(shù)
1756-OX8I/AB智能制造
1756-OA16 74-265 VAC OUTPUT 16PTS
1756-OA16I 74-265 VAC ISOLATED OUTPUT 16PTS
1756-OA8 74-265 VAC 2 AMP OUTPUT 8PTS
1756-OA8D 74-132 VAC DIAGNOSTIC OUTPUT 8PTS
1756-OA8E 74-132 VAC ELEC FUSED 2A OUTPUT 8PTS
1756-OB16D 19-30 VDC DIAGNOSTIC OUTPUT 16PTS
1756-OB16E VDC ELEC FUSED OUTPUT 16PTS
1756-OB16I VDC ISOLATED OUTPUT 16PTS
1756-OB32 VDC OUTPUT 32PTS
1756-OB8 VDC 2 AMP OUTPUT 8PTS
1756-OB8EI VDC ISOLATED ELEC FUSED OUTPUT 8PTS
1756-OC8 VDC 2 AMP OUTPUT 8PTS
1756-OF4 ANALOG OUTPUT
1756-OF6CI ISOLATED ANALOG INPUT-CURRENT/VOLTAGE 6PTS
1756-OF6VI ISOLATED ANALOG INPUT-CURRENT/VOLTAGE 6PTS
1756-OF8 ISOLATED ANALOG INPUT-CURRENT/VOLTAGE 8PTS
1756-OH8I VDC ISOLATED 2 AMP OUTPUT 8PTS
1756-ON8 VAC 2 AMP OUTPUT 8 PTS
1756-OV16E VDC ELEC FUSED SINKING OUTPUT 16PT
1756-OW16I N.O. ISOLATED RELAY OUTPUT 16PTS
1756-OX8I N.O./N.C. ISOLATED RELAY OUTPUT 6PTS
1756-PA72 VAC POWER SUPPLY
1756-PA75 VAC POWER SUPPLY
1756-PB72 VDC POWER SUPPLY
1756-PB75 VDC POWER SUPPLY
1756-PLS PROGRAMMABLE LIMIT SWITCH MODULE
1756-TBCH 36 PIN SCREW CLAMP BLOCK W/STANDING HOUSING
1756-TBE EXTENDED DEPTH TERMINAL BLOCK HOUSING
1756-TBNH 20 POSITION NEMA SCREW CLAMP BLOCK
1756-TBS6H SPRING CLAMP BLOCK
1756-TBSH SPRING CLAMP BLOCK
1756-TCO2 INTERFACE TRANSCEIVER CABLE
1756-TC15 INTERFACE TRANSCEIVER CABLE