在開機(jī)前,如果不強(qiáng)制使保持繼電器復(fù)位,將會(huì)產(chǎn)生機(jī)械設(shè)備的誤動(dòng)作,系統(tǒng)設(shè)計(jì)時(shí),通常采用的方法是設(shè)置硬件復(fù)位按鈕,需要的時(shí)候,能夠使保持繼電器,定時(shí)器、計(jì)數(shù)器、高速計(jì)數(shù)器強(qiáng)制復(fù)位,在控制系統(tǒng)的調(diào)試中發(fā)現(xiàn),如果使用保持繼電器,定時(shí)器,計(jì)數(shù)器、高速計(jì)數(shù)器次數(shù)過多,硬件復(fù)位的功能很多時(shí)候會(huì)不起作用,也就是說,硬件復(fù)位的方法有時(shí)不能準(zhǔn)確,及時(shí)地使PLC的內(nèi)部繼電器、定時(shí)器、計(jì)數(shù)器復(fù)位,從而導(dǎo)致控制系統(tǒng)不能正常運(yùn)轉(zhuǎn),在調(diào)試過程中,人為地設(shè)置軟件復(fù)位信號(hào)作為內(nèi)部信號(hào),可確保保持繼電器有效復(fù)位,使系統(tǒng)在任何情況下均正常運(yùn)轉(zhuǎn)。

廈門岳航計(jì)算機(jī)工程有限公司

聯(lián)系人：李素云

企業(yè)QQ：2851195446，2851195466

手機(jī)：18965423501

座機(jī)：0592-5165501

3 硬件電路

PLC的組成的控制系統(tǒng)硬件電路。當(dāng)一個(gè)兩線式傳感器,例如光電開關(guān),接近開關(guān)或限位開關(guān)等,作為輸入信號(hào)裝置被置被接到PLC的輸入端時(shí),漏電流可能會(huì)導(dǎo)致輸入信號(hào)為ON,在系統(tǒng)調(diào)試中,如果偶爾產(chǎn)生誤動(dòng)作,有可能是漏電流產(chǎn)生的錯(cuò)誤信號(hào)引起的。為了防止這種情況發(fā)生,在設(shè)計(jì)硬件電路時(shí),在輸入端接一個(gè)并聯(lián)是阻,并聯(lián)電阻的計(jì)算公式。

其中,不同型號(hào)的PLC漏電流值可查閱廠商提供的產(chǎn)品手冊(cè),在硬件電路上做這樣的處理,可有效地避免由于漏電流產(chǎn)生的誤動(dòng)作。

Allen-Bradley 700-HA33Z12 Relay Series D with P&B 27E892 Relay Socket

Allen-Bradley 700-HA32Z12 Relay 250V 10ASeries D with P & B 27E891 Relay Socket

Allen-Bradley 700-HF33Z24 Relay 10A Series D with 700-HN126 Series A

Allen-Bradley 700-HF33Z24 Relay Series B with 700-HN138 Relay Socket Series A

Allen-Bradley 700-HC24A1 Relay 120VAC Series B with 700-HN128 Relay Socket

Curtis RS12 Relay Socket 10A 250V 11Pin

Allen-Bradley 700-HC24A1 Relay 120VAC Series B

Allen-Bradley 700-HA32A24 Relay 24VAC Series C

Allen-Bradley 700-HN100 Relay Socket Series B 300VAC 10A

Allen-Bradley 700-HF32A1 Relay 10A Series B

Allen-Bradley 700-HK36Z24 Relay 24 VDC Series A

Allen-Bradley 700-HB32A24 Relay 10A 24VAC 50/60 Hz Series C

Allen-Bradley 700-HB32Z24 Relay 24 VDC 15A 8 Pin Series D

Allen-Bradley 700-HA32Z24 Relay 24 VDC Series A with Curtis RS8 Relay Socket

Gould J20B40 Control Relay

Allen Bradley 700-HC14A1-4 Relay with Potter & Brumfield 27E894 Relay Socket

Allen Bradley 700-HC24A1 Relay with Allen Bradley 700-HN103 Relay Socket (Used)

Magnecraft W78CSX-5 Relay 120V 3A 14 Pin

Amphenol 146 Relay Socket 8 Pin

Allen-Bradley 700-HN154 Relay Socket Series A 300VAC 15A 11 Pin

1746-OW4

1746-OW16

1746-OVP16

1746-OV8

1746-OV32

1746-OV16

1746-OG16

1746-OBP8

1746-OBP16

1746-OB8

1746-OB6EI

1746-OB32E

1746-OB32

1746-OB16E

1746-OB16

1746-OAP12

1746-OA8

1746-OA16

1746-NT8

1746-NT4

1746-NR8

1746-NR4

Allen Bradley 700-HK32A1 Relay 240V 5A 8 Pin with 700-HN122 Relay Socket (Used)

Ward Leonard Electric Co. 130-6539 Relay (Used)

Potter & Brumfield KRPA11AN Relay 250V 10A 8 Pin with Curtis RS8 Relay Socket

Syracuse Electronics TFR-200322 Timing Relay 115V 10A

Potter & Brumfield CHB-38-70002 Time Delay Relay 120V 10A

Syracuse DDR00303 Timimg Relay 115V 10A with Relay Base