57
Remote Communication Characteristics
Section 3-5
2.
If message communication is being performed, add the number of words
used in message communication to the above number of words for when-
ever messages are being processed.
3.
Refer to the PLC's operation manual for more details on the refresh time
and the PLC's cycle time.
Slice Bus Communication
Cycle Time (T
SL
)
The SmartSlice bus communication cycle time is the delay in the SmartSlice
I/O System from the end of communication with one I/O Unit until the start of
communication with the next Unit.
Communication Unit
Processing Time
(T
SL-CI
and T
SL-CO
)
The PROFIBUS Communication Unit processing time is the time required for
software processing in the Communication Unit.
Slice Bus Communication
Time
(T
SL-IN
and T
SL-OUT
)
The Slice bus communication time is the time required to communicate with
an Input Unit (T
SL-IN
) or Output Unit (T
SL-OUT
) in the SmartSlice I/O System.
T
SL
, T
SL-CI
, T
SL-CO
, T
SL-IN
and T
SL-OUT
strongly depend on the number of
SmartSlice I/O Units as well as on the amount of I/O data per SmartSlice I/O
Unit. The examples below present an indicative measure for the time required
to process PROFIBUS output data.
Example
The image below shows the GRT1-PRT DTM with a typical SmartSlice I/O
Unit configuration.
All Unit functions set by DIP switches (see section
3-2 Unit Functions
) on the
GRT1-PRT PROFIBUS Communication Unit are enabled (recommended set-
ting) and the PROFIBUS communication is being operated at 1500 kbit/s. The
approximate minimum and maximum time intervals from PROFIBUS output
data to be received by the GRT1-PRT and the intended output signal to be
present on the output terminal is shown below for various configurations.
SmartSlice Configuration
min [ms]
max [ms]
Minimum (one GRT1-OD4-1 and one GRT1-ID4-1)
0.6
2.2
Typical (See image above)
1.4
4.4
Maximum (64 digital SmartSlice I/O Units)
3.4
11
Содержание GRT1 - 27-11-2006
Страница 1: ...OPERATION MANUAL PROFIBUS Communication Unit SmartSlice GRT1 Series GRT1 PRT Cat No W04E EN 03 ...
Страница 2: ...SmartSlice GRT1 Series GRT1 PRT PROFIBUS Communication Unit Operation Manual Revised November 27 2006 ...
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