SIMATIC PCS 7 process control system

Fast and safe communication
with PROFIBUS for the field area
Distributed peripherals such as I/O modules, transmitters,
drives, valves or operator terminals communicate with the automation
systems at field level through a powerful real-time
bus system. This communication is characterized by the deterministic
transmission of process data and the exception-based
transmission of alarms, parameters and diagnostics data.
PROFIBUS is predestined for these tasks because it enables
high-speed communication with the intelligent distributed
I/Os by means of a communications protocol (PROFIBUS DP) as
well as communication and simultaneous power supply for
transmitters and actuators (PROFIBUS PA).
PROFIBUS is simple, rugged and reliable, can be expanded online
by further distributed components, and can be used in
both standard environments and hazardous areas. On account
of these characteristics, PROFIBUS is now established in all
sectors of the production, process and hybrid industries and
has become the most successful open fieldbus in the world.
This is confirmed by more than 14 million installed PROFIBUS
nodes.
PROFIBUS supports:
■ HART communication for integration of previously installed
HART devices
■ Redundancy
■ Fail-safety (PROFIsafe up to SIL 3 according to IEC 61508)
■ Isochronous mode
■ Time synchronization
■ Time tagging
Automation system
Long distances
with fiber-optics
OLM
OLM
Ex isolation
+ repeater
PROFIBUS DP (RS 485-iS)
PROFIBUS transmission systems
Industrial Ethernet
DP/PA link
RS 485-iS coupler
PROFIBUS PA (MBP)
PROFIBUS DP (RS 485)
PROFIBUS transmission systems
PROFIBUS DP
■ RS485:
Simple and low-cost electrical transmission system based
on shielded two-wire cable.
■ RS485-iS:
Intrinsically-safe electrical transmission system for hazardous
areas up to Ex zone 1, implemented using a shielded
two-wire cable with a transmission rate of 1.5 Mbit/s.
■ Fiber-optic:
Optical transmission system with glass or plastic fiber-optic
cables, for fast transmission of large quantities of data
in environments with high interferences or for covering
long distances.
PROFIBUS PA
■ MBP (Manchester coded; bus powered):
Intrinsically-safe transmission system which permits simultaneous
transmission of digital data and powering of
the field devices by means of a two-wire cable. It is suitable
for direct interfacing of devices in environments up to
Ex zone 0 or 1.
44 Communication