1-7
1 Features and System Configuration
CJ-series PROFIBUS Slave Unit Operation Manual for NJ-series CPU Unit (W510)
1-
1 Overview
of PROF
IBUS
1
1
-1-6
Dat
a T
hroughp
ut
Transmission Time
At 12 Mbps, PROFIBUS-DP requires only about 1 ms for the transmission of 512 bits of input data
and 512 bits of output data distributed over 32 stations. The figure below shows the typical PROFI-
BUS-DP transmission time depending on the number of stations and the transmission speed. The
data throughput will decrease when more than one master is used.
Extensive Diagnostics
The extensive diagnostic functions of PROFIBUS-DP enable fast location of faults. The diagnostic
messages are transmitted over the bus and collected at the master. These messages are divided
into three levels:
1
Device Related Diagnostics
These messages concern the general operational status of the whole device (e.g. over temperature
or low voltage).
2
Module Related Diagnostics
These messages indicate that a fault is present in a specific I/O range (e.g. an 8-bit output module)
of a station.
3
Channel Related Diagnostics
These messages indicate an error at an individual input or output (e.g. short circuit on output 5).
1-1-6
Data Throughput
1-1-7
Diagnostic Functions
