Setting Up A Network - Siemens SIMATIC C7-626 Installation, Assembly, Wiring

Configuring MPI Networks and PROFIBUS-DP Networks
3.1

Setting Up a Network

Definition:
Multipoint
Interface (MPI)
MPI Transmission
Rate
3
Definition:
PROFIBUS DP
DP Transmission
Rate
Connectable
Nodes
Device / Node
Segment
3-2
The interface of the C7 for connecting, for example, programming devices, is
called a multipoint interface since several devices can communicate with the
C7 via this interface (that is, communication can take place from several
points).
The MPI transmission rate of the C7-626 and C7-626 DP is fixed at
187.5 Kbps.
Digital, analog and intelligent modules, as well as a wide range of field
devices according to DIN E 19245 Part 3 such as drives or valve islands, are
stored locally from the automation system to the process – up to a distance of
23 km.
The modules and field devices are thus connected to the automation system
via the field bus PROFIBUS DP and addressed as local I/Os.
The DP transmission rate of the C7-626 DP can be set up to 12 Mbps.
The following table shows which nodes you can use to set up a network.
MPI
Programming devices (PG/PC)
Operator interface devices (OP)
S7-300/M7-300
S7-400/M7-400
Additional C7 devices
FMs, CPs
Convention: all devices that you connect in an MPI network are called nodes.
Note that the C7 occupies two MPI addresses and therefore already consists
internally of two nodes.
A segment is a bus line between two terminating resistances. A segment can
contain up to 32 nodes.
PROFIBUS DP
(only with C7-626 DP)
Programming device (PG/PC)
Operator interface devices (OP)
DP masters (C7-CPU DP)
Additional DP masters
DP slaves
C7-626 / C7-626 DP Control Systems
C79000-G7076-C626-01