user's manual - Ana-Digi Systems

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CHAPTER 8 INSTALLATION AND STARTUP 8.1.2 Cable installation For Profibus cable, the Shielded Twisted Pair Cable should be used. Table 8.1 and Table 8.2 shows cable specification and max. transmission distance according to speed and cable type. Cable characteristic Type A Type B Impedance 135 – 165 Ω (f= 3 to 20 MHz) 100 – 130 Ω (f > 100 KHz) Capacity < 30 pF/m < 60 pF/m Resistance < 110 Ω/Km - Conductor Area >= 0.34 mm 2 (22 AWG) >= 0.22 mm 2 (24 AWG) Table 8.1 Cable Specifcation Baud rate (kbit/s) 9.6 19.2 93.75 187.5 500 1500 3000 6000 12000 Cable Type A 1200 1200 1200 1000 400 200 100 100 100 Cable Type B 1200 1200 1200 600 200 70 - - - Table 8.2 Transmission distance according to Cable and Speed Note) For Transmission distance, assuming that max. signal attenuation is 6dB. 1) General notices • Termination treatment of vertical section is needed. • In case that the distance is far between stations, it is possible to extend the segment through repeater. (max. 9 repeater, 10 segment), available to connect 32 stations per segment (incl. repeater), max. 126 stations.(Repeater does not have station no.). The extended segment having no station is available. • Generally, connect the red cable to no.3 pin TXD/RXD-positive and the green cable to no.8 pin TXD/RXD-negative. Shield shall be connected to the housing of connector. • Use the cable that shield density is more than 80%. • The ends of cable shield should be grounded. • If the ground potential difference between stations is big, a great amount of current may flow through the shield. In this case, install the cable to make the ground potential difference equal separately. For high speed more than 1.5MBps, special cares should be taken. • Use the special connector having the inductor inside. • Spur Line is not allowed to use. • In case of 12Mbps, keep the distance more than 1m between stations. 8-2
CHAPTER 8 INSTALLATION AND STARTUP 2) Termination treatment • Each segment should do the termination treatment for both ends. If there are several segments, it is required to do the termination treatment for each segment. • 3 resistances are necessary for termination. • If possible, install the master at the end of one side. VP(6) A-Line (3) 390 Ohm 220 Ohm B-Line (8) 390 Ohm GND(5) Figure 8.1 Vertical section treatment 8-3
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USER’S MANUAL LG Programmable Log
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REVISION HISTORY Issue Date Manual
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CHAPTER 2 TERMINOLOGY Broadcast Com
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CHAPTER 3 GENERAL SPECIFICATION 3.2
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