Tài liệu mạng truyền thông Profibus

FCM 300 / FCD 300 / VLT® 2800 / DP V1 PROFIBUS ■ Physical connection The PROFIBUS is connected to the bus line via X100, terminals 1 and 2. It is recommended to use a master with a galvanic isolated bus driver and with over voltage protection (e.g. zenerdiode). EMC precautions The following EMC precautions are recommended to obtain interference free operation of the PROFIBUS network. Additional information on EMC can be found in the design guide on the FCM 300 (MG.03.BX.02). Please also consult the manual of the PROFIBUS master for further installation guidelines. earth potential. The earth connection must have a low HF (high frequency) impedance. This can be achieved by connecting a large surface area of the cabinet to earth, for example by mounting the FC motor on a conductive rear plate. Especially when having long distances between the stations in a PROFIBUS network it can be necessary to use additional potential equalizing cables, connecting the individual stations to the same earth potential. ■ Connection of the cable screen The screen of the PROFIBUS cable must always be connected to ground at both ends, that means the screen must be connected to ground in all stations connected to the PROFIBUS network. It is very important to have a low impedance ground connection of the screen, also at high frequencies.This can be obtained by connecting the surface of the screen to ground, for example by means of a cable clamp or a conductive cable gland. The FCM 300 Series is provided with different clamps and brackets to enable a proper ground connection of the PROFIBUS cable screen. The screen connection is shown in the following drawing. The Profibus Interface NB!: Relevant national and local regulations, for example regarding protective earth connection, must be observed. ■ Cable connection FCM 300 The PROFIBUS communication cable must be kept away from motor and brake resistor cables to avoid coupling of high frequency noise from one cable to the other. Normally a distance of 200 mm is sufficient, but it is generally recommended to keep the greatest possible distance between the cables, especially where cables are running in parallel over long distances. If the PROFIBUS cable has to cross a motor and braking resistance cable, it should occur at a 90° angle. ■ Earth connection It is important that all stations connected to the PROFIBUS network are connected to the same MG.90.A5.02 - VLT is a registered Danfoss trademark 11 FCM 300 / FCD 300 / VLT® 2800 / DP V1 PROFIBUS The bus termination - FCM 300 1 = RxD/TxD-P∼ (red cable) 2 = RxD/TxD-N∼ (green cable) It is essential that the bus line is terminated properly. A mismatch of impedance may result in reflections on the line that will corrupt data transmission. - The PROFIBUS is provided with a suitable termination which may be activated by the switches of the RS485 switch block located just to the left of the terminal block X100 (see drawing below). The switches should be on to terminate the bus. NB!: The switches should never be left in opposite positions. They should either both be ON or both be OFF! - 12 Most masters and repeaters are equipped with their own termination. If an external termination circuit consisting of three resistors is connected to the bus line a 5 V d.c. power supply must be used, please note that this must be galvanically isolated from the a.c. line. MG.90.A5.02 - VLT is a registered Danfoss trademark FCM 300 / FCD 300 / VLT® 2800 / DP V1 PROFIBUS ■ FCM 300 LEDs There are 2 LEDs on the PROFIBUS: LED303: LED304: Lights up when the card is initialized and ready to communicate. It will flash while auto baudrate detection is attempting to detect the actual baudrate. Lights up when the card is communicating, depending on baudrate. The Profibus Interface NB!: A high baudrate results in dim light in LED304. MG.90.A5.02 - VLT is a registered Danfoss trademark 13 FCM 300 / FCD 300 / VLT® 2800 / DP V1 PROFIBUS ■ Physical connection FCD 300 The PROFIBUS is connected to the bus line via, terminals 68 and 69. It is recommended to use a master with a galvanic isolated bus driver and with over voltage protection (e.g. zenerdiode). Especially when having long distances between the stations in a PROFIBUS network it can be necessary to use additional potential equalizing cables, connecting the individual stations to the same earth potential. Connecting the bus line EMC precautions The following EMC precautions are recommended to obtain interference free operation of the PROFIBUS network. Additional information on EMC can be found in the design guide on the FCD 300 (MG.04.AX.02). Please also consult the manual of the PROFIBUS master for further installation guidelines. ■ Connection of the cable screen The screen of the PROFIBUS cable must always be connected to ground at both ends, that means the screen must be connected to ground in all stations connected to the PROFIBUS network. It is very important to have a low impedance ground connection of the screen, also at high frequencies.This can be obtained by connecting the surface of the screen to ground, for example by means of a cable clamp. The FCD 300 Series is provided with a spring loaded clamp to enable a proper ground connection of the PROFIBUS cable screen. The screen connection is shown in the following drawing. NB!: Relevant national and local regulations, for example regarding protective earth connection, must be observed. ■ Cable connection FCD 300 The PROFIBUS communication cable must be kept away from motor and brake resistor cables to avoid coupling of high frequency noise from one cable to the other. Normally a distance of 200 mm is sufficient, but it is generally recommended to keep the greatest possible distance between the cables, especially where cables are running in parallel over long distances. If the PROFIBUS cable has to cross a motor and braking resistance cable, it should occur at a 90° angle. ■ Earth connection FCD 300 It is important that all stations connected to the PROFIBUS network are connected to the same earth potential. The earth connection must have a low HF (high frequency) impedance. 14 MG.90.A5.02 - VLT is a registered Danfoss trademark FCM 300 / FCD 300 / VLT® 2800 / DP V1 PROFIBUS The bus termination 69 = RxD/TxD-N∼ (green cable) It is essential that the bus line be terminated properly. A mismatch of impedance may result in reflections on the line that will corrupt data transmission. - - - If an external termination circuit consisting of three resistors is connected to the bus line a 5 V d.c. power supply must be used, please note that this must be galvanically isolated from the a.c. line. The PROFIBUS is provided with a suitable termination which may be activated by the switches of the RS485 switch block located on the bottom of the electronics part (see drawing below). The switches should be on to terminate the bus. Most masters and repeaters are equipped with their own termination. NB!: The switches should never be left in opposite positions. They should either both be ON or both be OFF! NB!: Is 126 or 127 selected the address is setting via P918, refer to chapter station address. MG.90.A5.02 - VLT is a registered Danfoss trademark 15 The Profibus Interface 68 = RxD/TxD-P∼ (red cable) FCM 300 / FCD 300 / VLT® 2800 / DP V1 PROFIBUS Switch Address 0 1 2 ....125 126 127 (default) 1 OFF ON OFF ON ON ON 2 OFF OFF ON ON ON ON 3 4 OFF OFF OFF ON ON ON Switch OFF OFF OFF ON ON ON 5 setting OFF OFF OFF ON ON ON 6 7 8 OFF OFF OFF OFF ON ON OFF OFF OFF ON OFF ON X X X X X X ■ FCD 300 LEDs The bus LED on the front: Baud rate search Baud rate found and drive is ready to get and set cyclical data Baud rate found and drive is not set to state receive/send cyclical data Only acyclical communication (no cyclical data) LCP stop mode or Operation site = local LED is flashing Flashing 1.5 sec. Remote and bus control Flashing 1.5 sec. Flashing: 2 sec. off, 320 ms on Flashing 1.5 sec. Flashing: 2 sec. off, 320 ms on LED is flashing On In case that a cyclical communication is established, the LED is on. If only a acyclical communication with a master 2 is active the LED is flashing. 16 MG.90.A5.02 - VLT is a registered Danfoss trademark