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Help CenterDSDP140B 57160001-ACX ABB Counter Board Main Process Control System
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DSDP140B 57160001-ACX ABB Counter board main process control system
DSDP140B 57160001-ACX ABB Counter board main process control system
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PROFIBUS DP is an open, high-speed and widely-used field bus.
It provides multi-master and master-slave communication in the field area. This
field bus can accordingly be used for AC500 and AC31 control system series and
for field-bus-neutral FBP devices (decentralized I/Os and intelligent switching
devices) via the PROFIBUS-FBP connector.
Communication
The masters rule data traffic on the bus. When in possession of the bus access
authorization (token), the masters can transmit data without an external request.
The passive devices, known as slaves, do not receive any bus access rights; they
acknowledge messages received, or respond to a query from a master. Baud
rates from 9.6 kBaud to 12 MBaud are supported. A maximum of 126 devices
can be operated on the bus.
Data exchange
This is handled predominantly in cyclical mode be-tween master and slave. The
requisite communication functions have been specified by the PROFIBUS DP
basic functions in accordance with EN 50170. Each master has full write and read
access to its assigned slaves, but only read access to the slaves assigned to
other bus masters. There is no direct data exchange between masters. Acyclical
services (DP-V1) for parameterization and diagnostics between master and slave
are also available. This is performed in parallel to the master’s cyclical user data
traffic.
PROFIBUS DP – the functionality at a glance
• Max. 126 subscribers via amplifier and max. 32 subscribers (master/slaves) per
bus segment
• Data transmission rate from max. 12 MBit/s with a cable length of 100 m, up to
93.75 kBit/s with 1200 m
• Multi-master or master/slave communication. Bus access of the masters using
token
• Connection of the master CPU and the associated communication module via
a 9-pole SUB-D plug connector. Connection of slaves (CPU, I/Os and intelligent
switching devices) via FieldBusPlug
• The system cable is a shielded twisted-pair line or a fiber-optic cable; transmission standard EIA RS485
Diagnostics
Detailed diagnostic messages for rapid trouble-shooting are shown on the CPU
display. In addition, the device status is indicated at the communica-tion module
by four LEDs.
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