1760-CBLPM02/AB智能制造
在中斷方式下,計(jì)算機(jī)能得到充分利用,緊急的任務(wù)也能得到及時(shí)處理。但是,如果同時(shí)來了幾個(gè)都要處理的任務(wù)該怎么辦呢?優(yōu)先級(jí)高的還好辦,低的呢?可能會(huì)出現(xiàn)照顧不到之處。所以,中斷方式不大適合于工作現(xiàn)場(chǎng)的日常使用。
但是,PLC在用掃描方式為主的情況下,也不排斥中斷方式。即,大量控制都用掃描方式,個(gè)別急需的處理,允許中斷這個(gè)掃描運(yùn)行的程序,轉(zhuǎn)而去處理它。這樣,可做到所有的控制都能照顧到,個(gè)別應(yīng)急的也能進(jìn)行處理。
PLC的實(shí)際工作過程比這里講的還要復(fù)雜一些,分析其基本原理,也還有一些理論問題。有關(guān)人員如果能把上面介紹的入出變換、物理實(shí)現(xiàn)--信息處理、I/O電路--空間、時(shí)間關(guān)系--掃描方式并輔以中斷方式,作為一種思路加以研究,弄清了它,也就好理解PLC是怎樣去實(shí)現(xiàn)控制的,也就好把握住PLC基本原理的要點(diǎn)了。
1760-CBLPM02/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