Siemens SIMOTION C 230-2 Operating Instructions Manual page 120

Connecting
6.2 Networking
Recommendation for PROFIBUS addresses
Reserve PROFIBUS address "0" for a service programming device and "1" for a service SIMATIC
HMI device, which will be connected to the subnet if required.
Recommendation for the PROFIBUS address of the SIMOTION C in case of replacement or
service:
Reserve address "2" for a SIMOTION C. This prevents duplicate addresses when installing a
SIMOTION C with factory setting on the subnet (e.g. when a SIMOTION C is replaced). You should
therefore assign addresses greater than "2" to additional nodes in the subnet.
Segment
A segment is a bus cable between two terminating resistors. A segment with SIMOTION C as the
master can contain up to 64 slaves. In addition, a segment is limited by the permitted cable
length according to the baud rate (see chapter Onboard measuring system interface (C230-2,
C240) (Page 57)).
Rules for connecting nodes in a subnet
• Connect all nodes in a subnet "in series". In addition, integrate the programming devices and
SIMATIC HMI devices for commissioning or servicing in the subnet in series.
• If you are operating more than 32 nodes in one subnet, you must use RS 485 repeaters to
connect the bus segments (see also the description of the RS 485 repeater in the S7-300
Automation Systems, M7-300, Module Data Manual).
In a PROFIBUS subnet, all bus segments combined must have at least one DP master and one
DP slave.
• Use RS 485 repeaters to connect ungrounded bus segments and grounded bus segments.
• The maximum number of nodes per bus segment decreases with each RS 485 repeater. That
is, if a bus segment contains one RS 485 repeater, the bus segment can contain no more than
31 additional nodes. However, the number of RS 485 repeaters does not affect the maximum
number of nodes on the bus.
Up to ten segments can be connected in series.
• Switch on the terminating resistor at the first and last node of a segment.
Components
Connect the individual nodes using bus connectors and the PROFIBUS cable, also refer to
chapter Network components for a PROFIBUS subnet (Page 122). Remember to provide a bus
connector with a programming device socket at the ends of the subnet. This will give you the
option of expanding the subnet if required (for example, for a programming device or SIMATIC
HMI device).
Use RS 485 repeaters for the connection between segments and for extending the cable.
120
Operating Instructions, 11/2022, A5E33441428B
SIMOTION C