5
Overview of PROFIBUS
Section 1-1
tive to communicate with DPM1 master devices in a master-master
communication relationship.
Multi-peer Communication
In addition to logical peer-to-peer data transmission, PROFIBUS DP provides
multi-peer communication (broadcast and multicast).
Broadcast
Communication
In the case of broadcast communication a master device sends an unac-
knowledged message to all other devices (masters and slaves).
Multicast Communication
In the case of multicast communication a master device sends an un-
acknowledged message to a predetermined group of devices (masters and
slaves).
1-1-5
Diagnostic functions
Extensive Diagnostics
Extensive diagnostic functions defined in PROFIBUS DP enable the fast loca-
tion of error at slave devices. Diagnostic messages are transmitted over the
bus and collected at the master. Three levels of diagnostic messages are
defined:
Device Related
Diagnostics
• Messages concerning the general operational status of the whole device,
e.g. over temperature, low voltage.
Module Related
Diagnostics
• Messages indicating that an error is present in a specific I/O range of a
device, e.g. an 8-bit output module.
Channel Related
Diagnostics
• Messages indicating an error at a given input or output, e.g. short circuit
on Output 5.
1-1-6
Protection mechanisms
Monitoring Time
PROFIBUS DP provides effective protection functions against parameteriza-
tion errors or failure of the transmission equipment. Time monitoring is pro-
vided both at the master and the slave devices. The monitoring interval is
specified when the system is configured.
Monitoring at the Master
The PROFIBUS DP Master monitors data transmission of the slaves with the
Data-Control-Timer. A separate control timer is used for each slave. This
timer expires if response data is not correctly transmitted by the slave within
the monitoring interval. The user is informed when this happens. If the auto-
matic error reaction (Auto-CLEAR) has been enabled, the PROFIBUS DP
Summary of Contents for PROFIBUS DP GATEWAY
Page 1: ...OPERATION MANUAL PROFIBUS DP Gateway to Host Link Compoway F PRT1 SCU11 Cat No W01E EN 02 ...
Page 2: ...PRT1 SCU11 PROFIBUS DP Gateway Operation Manual Revised September 19 2005 ...
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