BL20 – ECO GATEWAY FOR PROFIBUS-DP - TURCK USA
BL20 – ECO GATEWAY FOR PROFIBUS-DP - TURCK USA
BL20 – ECO GATEWAY FOR PROFIBUS-DP - TURCK USA
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System overview<br />
Table 1:<br />
Maximum<br />
System expansion<br />
<strong>PROFIBUS</strong>-<strong>DP</strong><br />
Single-Master systems<br />
With mono-master systems merely a single master on the bus is active during bus operation.<br />
The PLC is the central control component. The slaves are coupled decentrally to the PLC via<br />
the transmission medium. With this type of system configuration the shortest bus cycle times<br />
are achieved.<br />
Multi-Master systems<br />
In multi-master operation there are several masters on the bus. These form independent subsystems,<br />
consisting of one <strong>DP</strong>M1 each and the associated slaves, or additional configuration<br />
and diagnostic devices. The slave input and output data can be read by all <strong>DP</strong> masters.<br />
Writing of outputs is reserved to a single <strong>DP</strong> master (the assigned <strong>DP</strong>M1 during configuration).<br />
Multi-Master systems achieve an average bus cycle time. In time-critical applications you<br />
should monitor the bus cycle time via a connected diagnostic tool.<br />
Topology<br />
<strong>PROFIBUS</strong>-<strong>DP</strong> communicates via a shielded 2-wire cable according to the RS485 standard.<br />
The network topology accords to a line structure with active bus terminators on both ends.<br />
Maximum system extension<br />
<strong>PROFIBUS</strong>-<strong>DP</strong> is suited for connection of a large number of I/O points. Up to 126 addressable<br />
bus nodes enable connection of thousands of analogue and digital I/O points within a<br />
network.<br />
<strong>PROFIBUS</strong>-<strong>DP</strong> allows a maximum of 32 nodes per segment; please note that masters and<br />
repeaters always count as nodes. One segment is defined as the bus section between two<br />
repeaters. If no repeaters are used, the entire network corresponds to one segment.<br />
Segments must comply with the specified maximum length and the specified transmission<br />
rates. Up to nine repeaters, type "REP-<strong>DP</strong>0002" may be connected within a network. The<br />
maximum length of a bus line within a segment and the number of repeaters are listed in the<br />
following table.<br />
Communication rate Length of bus line Max. no. of<br />
repeaters<br />
9.6 kbps 1200 m 2 126<br />
19,2 kbps 1200 m 2 126<br />
93,75 kbps 1200 m 2 126<br />
187,5 kbps 1000 m 2 126<br />
500 kbps 400 m 4 126<br />
1.5 Mbps 200 m 6 126<br />
12 Mbps 100 m 9 126<br />
Max. no. of nodes<br />
Attention<br />
The maximum number of 32 bus nodes may not be exceeded without a repeater.<br />
D301106 - <strong>BL20</strong>-<strong>ECO</strong> <strong>PROFIBUS</strong>-<strong>DP</strong> 1007 2-3<br />
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