Siemens SIMATIC NET PROFIBUS manual Configuring

Configuring Networks

Configuring

When configuring an electrical network with RS-485 repeaters, the following conditions must be taken into account:

SThe maximum segment length for the transmission rate must be adhered to (see Table 3-1, Table 3-3, Table 3-6,)

SThe maximum number of bus attachments (nodes, OLMs, RS-485 repeaters,...) in one segment is restricted to 32. There may be further restrictions at a transmission rate of 1.5 Mbps (see Section 3.1.2).

SThe maximum number of nodes in one network is limited to 127.

SA maximum of 9 RS-485 repeaters can be installed between two nodes.

3-10	PROFIBUS Networks SIMATIC NET
	6GK1970-5CA20-0AA1 Release 2 05/2000