Term Definition For Profibus-Dp - Mitsubishi MELESEC-ST User Manual

Term definition for PROFIBUS-DP

Term
Master station
Slave station
Repeater
Bus terminator
FDL address
Extended diagnostic
information
Slave parameter
GSD file
Input data
Output data
I/O data
Br.n bit input
Bw.n bit output
Wr.n word input
Ww.n word output
Information area
Request area
Number of occupied I/O
points
Slice No.
Command
ST bus cycle time
Bus cycle time
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The following explains the meanings and definitions of the terms used in this manual
when using PROFIBUS-DP.
Class 1 master station that communicates I/O data with slave stations.
Device that communicates I/O data with the master station.
Device that connects PROFIBUS-DP segments.
Terminator that is connected to both ends of each PROFIBUS-DP segment
Address assigned to the master station/slave station.
Information that is notified from the slave station to the master station when an error occurs at a
slave station.
The slave station parameter (including user parameter) set by the master station.
The setting items are described in the GSD file.
The electronic file that includes description of the slave station parameter.
The file is used to set slave parameters by the master station.
Data sent from the head module to the master station.
The data consists of the following areas.
Br Bit Input Area
Information Area
Er Error Information Area
Mr Module Status Area
Cr Command Result Area
Wr Word Input Area
Data that the head module receives from the master station.
The data consists of the following areas.
Bw Bit Output Area
Request Area
Ew Error Clear Area
Sw System Area
Cw Command Execution Area
Ww Word Output Area
Data (input data, output data) transferred between the head module and the master station.
Bit input data of each module.
Bit output data of each module
Word (16-bit) output data of an intelligent function module.
In the case of analog input module, the digital output data value is stored.
Word (16-bit) input data of an intelligent function module.
In the case of analog output module, the digital setting data value is stored.
Bit/Word input data for checking each module status and command execution results.
Bit/Word output data for requesting each module to clear errors/to execute commands.
The area, that is equivalent to the occupied I/O points is occupied in Br Bit Input Area/ Bw Bit
Output Area.
No. assigned to every 2 occupied I/O points of each module. This numbering starts by assigning
"0" to the head module and then proceeds in ascending order. (The maximum value No. is 127).
The No. is used for specifying the execution target.
Requesting from the master station in order to read the module status, to set/control the intelligent
function module command parameters.
Processing time for the head module to refresh the input/output status of each slice module.
PROFIBUS-DP processing time for the master station to perform cyclic transfer with
each slave station.
Definition
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