Thank you for purchasing Marathaon Drive MD100P Modbus/TCP Option board. Safety Instruction To prevent injury and danger in advance for safe and correct use of the product, be sure to follow the Safety Instructions. The instructions are divided as WARNING and CAUTION which mean as follow. WARNING CAUTION This symbol indicates the possibility of death or serious injury. This symbol indicates the possibility of injury or damage to property. The meaning of each symbol in this manual and on your equipment is as follows. This is the safety alert symbol. This is the dangerous voltage alert symbol. After reading the manual, keep it in the place that the user always can Contact easily. Read carefully this manual to use the communication option function of MDLV-100P Series Inverter safely and correctly. WARNING Be cautious about dealing with CMOS elements of option board. It can cause malfunction by static electricity. Connection changing like communication wire change must be Done with power off. It can cause communication faulty or malfunction. Be sure to connect exactly between Inverter and option board. It can cause communication faulty or malfunction. Check parameter unit when setting parameter. It can cause communication faulty 1
1. Introduction Modbus/TCP communication board make MDLV-100P inverter be connected to Ethernet network. Controlling and monitoring inverter can be done by PLC sequence program or any Master Module. Since Ethernet which constitutes Internet has been used and IPV4 has been supported, wherever Internet can be done, controlling and monitoring is possible. But, Ethernet network of the factory has to be connected to Internet through Gateway. With simple wiring, installation time can be reduced and maintenance becomes easier. 2. Modbus/TCP Technical features Transmission Speed Transmission method Max. extended distance between nodes. Max. node number Auto Negotiation Max. Frame size Communication zone access method Frame error checking method Recommended connecting channel 10Mbps, 100Mbps Baseband 100m (Node-Hub) Hub connection Supported 1500 byte CSMA/CD CRC32 3 channel 3. Product Constituents -. Modbus TCP communication board : 1 ea -. Supporting pole : 3 ea -. The manual : 1 ea 2
4. Modbus/TCP Appearance and Installation Installing communication card to 100P inverter 5. Network Connection 3
Communication cable connecting terminal Pin No. Signal Description Cable color 1 TX+ Transmitting data Plus White / Yellow 2 TX- Transmitting data Minus Yellow 3 RX+ Receiving data Plus White / Green 4 NONE Not used Blue 5 NONE Not used White / Blue 6 RX- Receiving data Minus Green 7 NONE Not used White / Brown 8 NONE Not used Brown 8 1 Make sure that cables connected to Pin1 and 2 are twisted together. Make sure that cables connected to Pin3 and 6 are twisted together. 6. Network Cable Standard 4
(1) Used Frequency band Category 5 is used. Transmitting speed of category 5 is 100MHz and possible up to 100Mbps. (2) Twisted Pair cable type Classification Detail Used UTP (U.UTP) Maximum 200MHz High speed signal cable Voice + Information(Data)+ with no cover Low-grade Video signal FTP (S.UTP) Cable core covered only Maximum 100MHz Electromagnetic interruption (EMI) or electric stability considered Voice+ Information (Data) + Low-grade Video signal Double-covered, Maximum 500MHz STP (S.STP) separately covered Pair Voice +Information(Data)+ with cable core Video signal covered 75Ω coaxial cable replacement 5
7. Modbus/TCP related Keypad parameter Inverter parameters below display Modbus/TCP related information. Code number Parameter name 100P Modbus/TCP related Keypad parameter Initial value Setting value COM-01 Opt B/D - - COM-02 Opt mode None None Command Freq Cmd +Freq COM-03 Opt Version - - COM-61 IP Addr Hi C0:A8 HEX COM-62 IP Addr Lo 64:0A HEX COM-63 Subnet Hi FF:FF HEX COM-64 Subnet Lo FF:00 HEX COM-65 Gateway Hi C0:A8 HEX COM-66 Gateway Lo 64:01 HEX COM-67 Comm Update 00:00 HEX ~ FF:FF HEX 00:00 HEX ~ FF:FF HEX 00:00 HEX ~ FF:FF HEX 00:00 HEX ~ FF:FF HEX 00:00 HEX ~ FF:FF HEX 00:00 HEX ~ FF:FF HEX Description Communication card installed in inverter is displayed. (If Modbus/TCP comm. Card is installed, Modbus/TCP is displayed) set method for drive and freq. command of communication card The version of Communication card installed in inverter is displayed. Set IP Address. Set Subnet Mask. Set Gateway Address. Communication related Keypad parameter is Updated. 6
(1) Opt B/D (Option card information, COM-01) The type of communication card installed in inverter is displayed automatically. If 100P Modbus/TCP communication card is installed, Modbus/TCP message is displayed automatically. (2) Opt mode (drive and freq. command setting mode, COM-02) Set the method for drive and freq. setting command of communication card. (3) Opt Version (Option version information, COM-03) Version of communication card installed in inverter is displayed automatically. (4) Modbus/TCP IP, Subnet Mask, Gateway Address (COM-61~66) IP version that Modbus/TCP option supports is v4. All the addresses and masks are expressed as decimal number. decimal number. decimal number. decimal number and a number between 0 and 255 is input for each decimal number. In Modbus/TCP option, all decimal number is supposed to changed into hexadecimal number. Also input dividing 2 higher hexadecimal numbers and 2 lower numbers EX) For setting IP Address 196.168.10.131 Change 196.168.10.131 into hexadecimal numbers. C0.A8.0A.83 For COM-61 IP Addr Hi, input C0:A8 HEX. ForCOM-62 IP Addr Lo, input 0A:83 HEX. (5) Comm UpDate (COM-67) For COM-61 ~ 66 parameters, when power inputs for the first time, the values set in Option are expressed. But if you set, the setting is not reflected at once. If Comm Update is set as Yes, the value is reflected to Modbus/TCP communication card and only Modbus/TCP communication card operates again. In the case of Parameter initialization, the values of COM-61 ~ 66 are changed into initial values even though they aren t reflected to actual option board. So also in this case, Comm. UpDate has to be done. 8. Inverter communication address 7
Refer to 100P manual appendix C - built-in comm. Parameter list 9. Modbus/TCP Frame (1) Modbus/TCP Frame structure MBAP Header( 7 bytes) PDU (5 bytes ~) Generally, Ethernet uses Ethernet II Frame. MODBUS Application Protocol Header (MBAP Header) MBAP Header structure is as below. Region Length Description Transaction Identifier 2 Bytes As an identified transmitting number, is increased by 1 each time Data Frame is send to Server from Client. Protocol Identifier 2 Bytes Fixed as 0. Length 2 Bytes Modbus Data Frame length. From MBAP Header to Unit Identifier, Byte-unit length can be expressed. Unit Identifier 1 Bytes When Modbus TCP and Modbus RTU are connected with Gate, Slave number is written. When Modbus TCP is only used, it is fixed as 0xFF. Protocol Data Unit (PDU) AS an actual Data of Modbus TCP, consists of Function Code and Data. Detail information will be given at (2) Function Code Description. 8
(2) Function Code Description Modbus TCP can be divided into Client and Server. Client gives the command and Server responds to the command. Generally, as Client, there are PLC, HMI, PC so on, and Server means inverter. 1 Read Multiple Registers It is a function for reading Data from Inverter (Server). Frame Constitution that Client requires Server Required Frame Length Value Function Code 1 Bytes 0x03 Comm. Address 2 Bytes 0x0000 ~ 0xFFFF Required Data number 2 Bytes 1~16 (by MD Inverter standard) Frame Constitution that Server responds to Master Responded Frame Length Value Function Code 1 Bytes 0x03 Comm. Address 1 Bytes 2 x Data required number Required Data number Data required Required number of Data number x 2 Bytes from comm. address 2 Write Single Register The function is used when modifying 1 Data of Inverter (Server). Frame Constitution that Client requires Server Required Frame Length Value Function Code 1 Bytes 0x06 Comm. Address 2 Bytes 0x0000 ~ 0xFFFF Data Value 2 Bytes 0x0000 ~ 0xFFFF 9
Frame Constitution that Server responds to Master Responded Frame Length Value Function Code 1 Bytes 0x06 Comm. Address 2 Bytes 0x0000 ~ 0xFFFF Data Value 2 Bytes 0x0000 ~ 0xFFFF 3 Write Multiple Register The function is used when modifying consecutive Data from 1 up to 16 inverter (Server). of Frame Constitution that Client requires Server Required Frame Length Value Function Code 1bytes 0x10 Comm. Address 2bytes 0x0000 ~ 0xFFFF Modifying Data number 2byte 1~16 (by MD inverter standard ) Byte Count 1byte 2 X Data number Data value to be modified Data number x 2 bytes Data for modifying Frame Constitution that Server responds to Master Responded Frame Length Value Function Code 1 Bytes 0x10 Comm. Address 2 Bytes 0x0000 ~ 0xFFFF Modifying Data 1~16 (by MD inverter 2 Bytes number standard) (3) Except Frame 10
Except Frame is for responding from Server if Error happens performing the required Frame when Client sends required Frame to Server. Exception Frame Structure Error Frame Length Value Error Code 1bytes 0x80 + Function Code that Client requires Exception Code 1bytes 0x0000 ~ 0xFFFF Exception Code Type Type Code Description ILLEGAL FUNCTION 0x01 If non-supported Function is Required, this massage is displayed. If Data of not used address is ILLEGAL DATA ADDRESS 0x02 required or to be modified, this massage is displayed. If you try to modify Data with the ILLEGAL DATA VALUE 0x03 Value that is against the permitted Data range, this massage is displayed. If there is error in Server (CAN Comm. ERROR with inverter, SLAVE DEVICE FAILURE 0x04 Option initialization ERROR, failure of DATA comm. with inverter), this massage is displayed. If Server can t respond due to other SLAVE DEVICE BUSY 0x06 process (such as Inverter parameter initialization or option initialization setting), this massage is displayed. If you try to save address that is READ ONLY ADDRESS 0X14 only for reading value, this massage is displayed. WRITE PERMITION ERROR 0x20 This Code only exists at LS inverter. If you try to modify modifying 11
prohibited parameter value this massage is displayed. 12
10. LED Information In Modbus/TCP communication card, 4 LEDs which indicate the Modbus/TCP state to the user are installed. In 100P Modbus/TCP communication card, LEDs are displayed as below. Green Green Red Green Speed Link Error CPU LED name Color Function CPU Green BLINK It means Modbus/TCP communication card CPU is operating normally when the power is well supplied to 100P Modbus/TCP. ERROR Red OFF It means Modbus/TCP communication card is normal without Error. CPU, ERROR Flashing by turns If IP Address is set as 0x00.0x00.0x00.0x00 or 0xFF.0xFF.0xFF.0xFF. Using special IP like 0.0.0.0 or 255.255.255.255 is not recommended Twice of CPU Blinking period time Flashing It means IP Address Setting is being tried. If you set Com update as Yes, LED is off as IP Address set in keypad is reflected to option board. CPU, ERROR Flashing at the same time It means Comm. Option board can not recognize inverter. Replace the board. ON It means Modbus/TCP option EEPRom is faulty. Replace the board. Speed Green ON means Comm. Speed is 100Mbps. OFF means Comm. Speed is 10Mbps. Link Green ON means it is ready to do communication. OFF If communication cable wiring is incorrect, Link LED becomes OFF. Check communication Cable. 13
LS 산전 Modbus/TCP 옵션보드를구입하여주셔서감사합니다. 안전상의주의사항 안전상의주의사항은사고나위험을사전에예방하여제품을안전하고올바르게사용하기 위한것이므로반드시지켜주십시오. 주의사항은 경고 와 주의 의두가지로구분되어있으며 경고 와 주의 의의미는다음과 같습니다. 경고 주의 지시사항을위반할때심각한상해나사망이발생할가능성이있는경우지시사항을위반할때경미한상해나제품손상이발생할가능성이있는경우 제품과사용설명서에표시된그림기호의의미는다음과같습니다. 는위험이발생할우려가있으므로주의하라는기호입니다. 는감전의가능성이있으므로주의하라는기호입니다. 사용설명서를읽고난후사용하는사람이언제라도볼수있는장소에보관하십시오. MDLV-100P 시리즈인버터의기능을충분하고안전하게사용하기위하여이사용설명서 를 잘읽어보십시오. 주의 옵션보드의 CMOS 소자들의취급에주의하십시오. 정전기에의한고장의원인이됩니다. 통신신호선등의변경접속은인버터전원을내린상태에서하십시오. 통신불량및고장의원인이됩니다. 인버터본체와옵션보드커넥터가정확히일치하게접속되도록하십시오. 통신불량및고장의원인이됩니다. 파라미터를설정할때는파라미터 unit 을확인하시기바랍니다. 통신불량의원인이됩니다. 14
11. 소개 Modbus/TCP 통신카드는 MDLV-100P 인버터를 Ethernet 네트워크에연결되도록합니다. 인버터의제어및모니터링이 PLC의시퀀스프로그램또는임의의 Master Module에의해제어가가능해집니다. 인터넷을구성하고있는 Ethernet을이용하고있으며 IPV4를지원하므로인터넷이되는곳에서는어디서든제어및모니터가가능합니다. 단공장의 Ethernet 망이 Gateway를통해인터넷이연결되어있어야합니다. 배선이간단하여설치시간을절감할수있고유지보수가쉬워집니다. 12. Modbus/TCP Technical features 전송속도 10Mbps, 100Mbps 전송방식 베이스밴드 노드간최대연장거리 100m ( 노드-허브 ) 최대노드수 허브접속 Auto Negotiation 지원 최대프레임크기 1500바이트 통신권액세스방식 CSMA/CD 프레임에러체크방식 CRC32 권장연결채널 3 채널 13. 제품구성물 Modbus/TCP 통신카드 1 개, 지지봉 3 개, 본매뉴얼로구성되어있습니다. 15
14. Modbus/TCP 외관및설치 100P 인버터에통신카드체결 15. Network 연결 16
통신선연결단자 Pin No. 신호 설명 선색 1 TX+ 송신데이터 Plus 흰 / 황색 2 TX- 송신데이터 Minus 황색 3 RX+ 수신데이터 Plus 흰 / 녹색 4 NONE 사용안함 청색 5 NONE 사용안함 흰 / 청색 6 RX- 수신데이터 Minus 녹색 7 NONE 사용안함 흰 / 갈색 8 NONE 사용안함 갈색 8 1 1 번과 2 번핀에연결된선은반드시서로꼬여있어야합니다. 3 번과 6 번핀에연결된선도반드시서로꼬여있어야합니다. 17
16. 네트워크케이블규격 (3) 사용주파수대역 카테고리 5 를사용합니다. 카테고리 5 는전송속도가 100MHz 이며전송속도는 100Mbps 까지가능합니다. (4) Twist Pair선의종류분류 상세 용도 UTP 최대 200MHz 비차폐고속신호용케이블 (U.UTP) 음성 + 정보 (Data)+ 저급영상신호 최대100MHz FTP 전자장애 (EMI) 및전기적안정화고려케이블코어만차폐된케이블 (S.UTP) 음성 + 정보 (Data) + 저급영상 (Video) 신호 최대 500MHz STP (S.STP) 2 중차폐로, Pair 개개차폐및케이블코어차폐된케이블 음성 + 정보 (Data)+ 영상 (Video) 신호 75Ω 동축케이블대체용 18
17. Modbus/TCP 관련 Keypad 파라미터 아래기능은 Modbus/TCP 관련정보를표시해주는인버터파라미터입니다. 100P Modbus/TCP 관련 Keypad 파라미터 Code Number 파라미터이름 초기값 설정값 설명 COM-01 Opt B/D - - 인버터에장착된통신카드이름을표시합니다. (Modbus/TCP 통신카드장착시 Modbus/TCP 라고표시됩니다 ) None COM-02 Opt mode None Cmd +Freq Command 통신카드의운전및주파수지 Freq 령장소를설정합니다. COM-03 Opt Version - - 인버터에장착된통신카드의버전을표시합니다. COM-61 IP Addr Hi C0:A8 HEX 00:00 HEX ~ FF:FF HEX 00:00 HEX IP Address를설정합니다. COM-62 IP Addr Lo 64:0A HEX ~ FF:FF HEX COM-63 Subnet Hi FF:FF HEX 00:00 HEX ~ FF:FF HEX 00:00 HEX Subnet Mask를설정합니다. COM-64 Subnet Lo FF:00 HEX ~ FF:FF HEX COM-65 Gateway Hi C0:A8 HEX 00:00 HEX ~ FF:FF HEX Gateway Address를설정합니 00:00 HEX 다. COM-66 Gateway Lo 64:01 HEX ~ FF:FF HEX COM-67 Comm Update 통신관련 Keypad 파라미터를 Update합니다. 19
(6) Opt B/D ( 옵션카드정보, COM-01) 현재인버터에장착된통신카드종류가무엇인지자동으로나타냅니다. 100P Modbus/TCP 통신카드장착시자동으로 Modbus/TCP 라고표시됩니다. (7) Opt mode ( 옵션버전정보, COM-02) 통신카드의운전및주파수지령장소를설정합니다. (8) Opt Version ( 옵션버전정보, COM-03) 현재인버터에장착된통신카드의버전이무엇인지자동으로나타냅니다. (9) Modbus/TCP IP, Subnet Mask, Gateway Address (COM-61~66) Ethernet 옵션이지원하는 IP의버전은 v4를선택하고있습니다. 즉, 모든주소나마스크들은 10진수.10진수.10진수.10진수로표현이되어있으며각각의 10진수는 0~255사이의숫자를입력하게됩니다. Ethernet 옵션에서는 10진수를모두 16진수로고쳐서입력하게되어있습니다. 또한상위 2개의 16진수와하위 2개를나누어입력하게됩니다. 예 ) IP Address 192.168.10.131를설정하려면 (192.168.10.131를 16진수로표현하면 C0.A8.0A.83 임 ) COM-61 IP Addr Hi 에 C0:A8 HEX 을입력하고 COM-62 IP Addr Lo 에 0A:83 HEX 을입력하면됩니다. (10) Comm UpDate (COM-67) COM-61 ~ 66의파라미터들은처음전원이들어올때는옵션에설정되어있는값들이표현합니다. 그러나설정을했을경우에는바로반영은되지않습니다. Comm Update를 Yes로했을경우에 Modbus/TCP 통신카드에이값이반영되고 Modbus/TCP 통신카드만재기동을합니다. 파라미터초기화의경우키패드상으로는 COM-61 ~ 66의값이초기값으로바뀌어있으나실제통신옵션보드에는반영이안되어있으므로이경우에도 Comm UpDate를수행해야합니다. 20
18. 인버터통신주소 인버터 100P 매뉴얼부록 C 내장형통신파라미터리스트를참조하시기바랍니다. 19. Modbus/TCP Frame (4) Modbus/TCP Frame 구성 MBAP Header( 7 bytes) PDU (5 bytes ~) 일반적으로 Ethernet 은 Ethernet II Frame 을사용합니다. MODBUS Application Protocol Header (MBAP Header) MBAP Header의구성입니다. 구역 길이 설명 Transaction Identifier 2 Bytes 고유의전송번호로 Client에서 Server로 Data Frame을보낼때마다 1씩증가합니다. Protocol Identifier 2 Bytes 0으로고정입니다. Modbus의 Data Frame길이로 MBAP Header에서 Length 2 Bytes Unit Identifier부터의 Byte단위의길이를나타냅니 다. Modbus TCP와 Modbus RTU가게이트를통해연결 Unit Identifier 1 Bytes 되어있을경우 Slave번호가적혀있게됩니다. Modbus TCP만사용할경우에는 0xFF로고정입니 다. Protocol Data Unit (PDU) 실질적인 Modbus TCP 의 Data 로 Function Code 와 Data 로이루어져있습니다. 자세한설명은아래 (2) Function Code 에대한설명 에서하겠습니다. 21
(5) Function Code에대한설명 Modbus TCP는 Client와 Server로나누어집니다. Client는명령을내리는입장이며 Server는명령에대한응답을하는입자입니다. 일반적으로 Client는 PLC, HMI, PC 등이있으며 Server는인버터를말합니다. 1 Read Multiple Registers 인버터 (Server) 에있는 Data 를읽을때사용하는함수입니다. Client에서 Server로요구하는 Frame 구성 요구 Frame 길이 값 Function Code 1 Bytes 0x03 통신주소 2 Bytes 0x0000 ~ 0xFFFF Data 요구개수 2 Bytes 1~16 (LS산전인버터기준 ) Server에서 Master로응답하는프레임구성 응답 Frame 길이 값 Function Code 1 Bytes 0x03 통신주소 1 Bytes 2 x Data 요구개수 Data 요구개수 Data 요구개 통신 주소로부터 개수 만큼의 수 x 2 Bytes Data 값 2 Write Single Register 인버터 (Server) 에 Data 를 1 개수정할때사용하는함수입니다. Client에서 Server로요구하는프레임구성 요구 Frame 길이 값 Function Code 1 Bytes 0x06 통신주소 2 Bytes 0x0000 ~ 0xFFFF Data 값 2 Bytes 0x0000 ~ 0xFFFF 22
Server에서 Master로응답하는프레임구성 응답 Frame 길이 값 Function Code 1 Bytes 0x06 통신주소 2 Bytes 0x0000 ~ 0xFFFF Data 값 2 Bytes 0x0000 ~ 0xFFFF 3 Write Multiple Register 인버터 (Server) 에 Data 를 1 개에서 16 개까지연속적인 Data 에한하여수정할때사 용하는함수입니다. Client에서 Server로요구하는프레임구성 요구 Frame 길이 값 Function Code 1bytes 0x10 통신주소 2bytes 0x0000 ~ 0xFFFF 수정하는 Data 개 2byte 1~8 (LS산전인버터기준 ) 수 Byte Count 1byte 2 X Data 개수 수정할 Data 값 Data 개수 수정할 Data들 x 2 bytes Server에서 Master로응답하는프레임구성 응답 Frame 길이 값 Function Code 1 Bytes 0x10 통신주소 2 Bytes 0x0000 ~ 0xFFFF 수정하는 Data 개 2 Bytes 1~16 (LS산전인버터기준 ) 수 23
(6) Except Frame Except Frame 은 Client 에서 Server 로요구하는 Frame 을보냈을때요구 Frame 을 수행하면서 Error 가발생하였을경우 Server 에서응답하는프레임입니다. Exception Frame 구성 Error Frame 길이 값 Error Code 1bytes 0x80 + Client가 요구한 Function Code Exception Code 1bytes 0x0000 ~ 0xFFFF Exception Code 종류 종류 Code 설명 ILLEGAL FUNCTION 0x01 지원하지않는 Function에대해서요구가있을경우 ILLEGAL DATA ADDRESS 0x02 사용하지않는어드레스의 Data를요구하거나수정하려는경우 ILLEGAL DATA VALUE 0x03 Data 수정을할때 Data 허용범위를밖에값으로수정하려는경우 Server에오류가있을경우 SLAVE DEVICE FAILURE 0x04 ( 인버터와 CAN 통신 ERROR, 옵션초기화 ERROR 경우, 인버터와의 DATA통신을실패한경우 ) Server가다른처리중이라응답을 SLAVE DEVICE BUSY 0x06 할수없을때 ( 인버터파라미터초기화, 옵션의초 기설정중일경우 ) READ ONLY ADDRESS 0x14 Read Only PARAMETER에값을저장하려고하는경우 LS 인버터에만존재하는 Code로 WRITE PERMITION ERROR 0x20 수정금지파라미터에값을수정하려 고할때 24
20. LED 정보 Modbus/TCP 통신카드에 4개의 LED가장착되어있고이 LED가현재의 Modbus/TCP 의상태를사용자에게알려줍니다. Modbus/TCP 통신카드에아래의순서로 LED가정렬되어있습니다. Green Green Red Green Speed Link Error CPU LED 이름 색 기능 CPU Green BLINK Modbus/TCP 통신카드에전원이잘공급되면 Modbus/TCP 통신카드 CPU가정상동작함을나타냅니다. ERROR Red OFF Modbus/TCP 통신카드가 Error 없이정상적임을표시합니다. CPU, ERROR이교번으로 Flashing IP Address를 0x00.0x00.0x00.0x00 혹은 0xFF.0xFF.0xFF.0xFF 로설정되어있을경우입니다. 0.0.0.0이나 255.255.255.255는특수한 IP이므로사용하지않는것이좋습니다. CPU Blink주기의 2배시간으로 Flashing IP Address설정을시도하는경우입니다. Com update를 Yes로하면키패드에설정된 IP Address가통신옵션보드에반영되면서 LED가꺼집니다. CPU, ERROR이동시에 Flashing 통신옵션보드가인버터를인식못하는경우입니다. 보드를교체하십시오 ON Modbus/TCP 옵션의 EEPRom의불량일경우입니다. 보드를교체하십시오. Speed Green ON 통신속도가 100Mbps 임을나타냅니다. OFF 통신속도가 10Mbps 임을나타냅니다. Link Green ON 통신할준비가되어있음을의미합니다. OFF 통신케이블배선불량인경우 Link LED가 OFF됩니다. 통신케이블을점검하십시오. 25
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