現場某一終端需測控開關輸入信號12路，開關輸出信號14路，模擬量輸入信號9路。因此，我們選用S7-214基本單元，一塊繼電器輸出擴展單元(EM222)，三塊模擬輸入擴展單元(EM231)。這樣系統共有開關輸入14路，開關量輸出18路，模擬量輸入信號9路，滿足現場要求。

廈門岳航計算機工程有限公司

聯系人：李素云

企業QQ：2851195446，2851195466

手機：18965423501

座機：0592-5165501

2、通訊接口

S7-214PLC基本單元提供一個RS-485接口，為了與無線信道的數傳機(電源、Modem、進口電臺三者合一)相連，我們專門設計了RS-485接口的專用Modem，并采用光電隔離技術，使二者在電氣上完全獨立，避免相互干擾，由于數傳機發射時需要RTS信號，而RS-485接口又不提供RTS信號，解決這個問題有兩處方法。其一，由無線Modem根據PLC的發射信息產生RTS信號，這就要求該Modem必須智能化，同時PLC在發送信息之前需先與Modem通信，讓其輸出RTS信號，并回送RTS已產生信息，然后PLC再發送現場信息。其二，采用PLC的某一I/O輸出點，產生RTS信號，由PLC在發送信息前現接通該點，控制數傳機發射，延時一段時間后(電臺建立載波時間)，再發送信息。后一種方法簡單、實用，較好的解決了無線通信的接口問題。

3、抗干擾設計

為提高系統的可靠性，現場終端、數傳機、PLC、直流溫壓電源及部分變送器裝于一個控制柜內，各部分相對獨立，便于維護。PLC開關量輸入、輸出與現場之間家繼電器隔離，模擬信號采用信號隔離器和配電器隔離，電源采用隔離變壓器供電，以減小電源“噪聲”，同時系統設置良好的接地。

New Keithley SSIO-24 I/O Module Accessory Board 24 Channel

New Carlo Gavazzi RM1A23A50 Solid State Relay 50A 230VAC

Crouzet GRD84130103 Solid State Relay 25Amp

Control Concepts 1022-12-70-POT SCR Power Controller 120VAC 70A 1PH

Grayhill 70M-ODC5B Relay 2.5-9VDC 3A REV.H 1124

Lot of 8 Gordos Crouzet M-ODC5 Relay 3.0-8VDC 3A 60VDC

Watlow CZ18-A48V-DC10 Contactor 4.5-32VDC-In 48-530VAC-18A-Out

Aerotech 4020 630D1064 Rev-K Linear Servo Controller 100-125VACIn, 40V

Grayhill 70MRCQ24 I/O Board 16 DC Input 70M-IDC5, 7 DC Output 70M-ODC5

Lot of 2 Phoenix Contact PLC-BSC-5DC/21 2980225 Relay Socket w/2967989 Relay

Lot of 2 Phoenix Contact PLC-BSC-24DC/21 2966016 Relay Socket w/2966618 Relay

Carlo Gavazzi RP1D060D4 Solid State Relay, 4.25VDC - 32VDC

Carlo Gavazzi RPM1P Relay Socket w/Carlo Gavazzi RP1D060D4 Solid State Relay

OPTO 22 G4PB16H Logic Controller Board w/x6 G4-OAC5 Output, G4-ODC5R, G4-IDC5

New Opto 22 AD6T Input Module, 0 to 5V Input

New Opto 22 DA5 Output Module 0 to +10VDC

Carlo Gavazzi RGC1A60A20KGU Solid State Contactor, Ue 42-600VAC 45-65Hz

Lot of 2 Phoenix Contact PLC-BSC-24DC/21-21 Relay Socket w/RTE24024 Relay

Crouzet GMS-IDC 84115503 Input Module 4.5-30VDC Output, 3-32VDC Input

Grayhill 70MRCQ24 I/O Board 16 DC Input 70M-IDC5, 6 DC Output 70M-ODC5

Gordos DR-ODC5 Solid State Relay 3.5-8VDC Input, 3-60VDC 3A Output

Lot of 6 Grayhill 70M-ODC5 Output Modules 2.5-10VDC

Lot of 11 Grayhill 70M-ODC5B Rev-F Output Modules 2.5-10VDC

Lot of 13 Grayhill 70M-ODC5B Rev-H Output Modules 2.5-10VDC

Lot of 5 Gordos M-ODC5 Relay 3.0-8VDC 3A 60VDC

Grayhill 70-IDC5 70-ODC5 Board with 12 DC Input, 12 DC Output

Gordos PB-16 Relay Mounting Board w/x8 Grayhill 70-ODC5 I/O Modules, x1 IDC-5

Lot of 2 Idec RSSDN-10A Solid State Relay 48-660VAC 10A, 4-32VDC

2D78559 2D78559G01

CE03250 CE03250-000000

EL3020

07KT97

07KT97

07KT97 WT97

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07KT97(WT97)

1336F-BRF50-AA-EN

1579A00412LM1BV

1756-IB16I

CVX-1243-MC2

DSDI110A 57160001-AAA

DSDO110

DSQC604 3HAC12928-1

KA55HXKGE-8331

MSD013A1Y

Continental Industries I.O-UMR-24-000 I.O Module Mounting Board w/x22 ODC5 Out

Potter & Brumfield 2I0-24 I/O Mounting Board w/x18 ODC5, See Details

Continental Industries I.O-UMR-24-000 I.O Mounting Board w/x6 IDC5, See Details

Continental Industries I.O-UMR-24-000 I.O Mounting Board w/x18 ODC5, See Details

Continental Industries I.O-UMR-24-000 I.O Module Mounting Board w/x6 IDC5 Input

Continental Industries I.O-UMR-24-000 I.O Module Mounting Board w/x23 IDC5 Input

Continental Industries I.O-UMR-24-000 I.O Mounting Board w/x22 IDC5, See Details

Continental Industries I.O-UMR-24-000 I.O Module Mounting Board w/x24 ODC5 Out