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Remote Communication Characteristics
Slice Bus Communication
Cycle Time (T
)
SL
Communication Unit
Processing Time
(T
and T
)
SL-CI
SL-CO
Slice Bus Communication
Time
(T
and T
)
SL-IN
SL-OUT
Example
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.
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.
The PROFIBUS Communication Unit processing time is the time required for
software processing in the Communication Unit.
The Slice bus communication time is the time required to communicate with
an Input Unit (T
) or Output Unit (T
SL-IN
T
, T
, T
, T
SL
SL-CI
SL-CO
SL-IN
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.
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
Minimum (one GRT1-OD4-1 and one GRT1-ID4-1)
Typical (See image above)
Maximum (64 digital SmartSlice I/O Units)
) in the SmartSlice I/O System.
SL-OUT
and T
strongly depend on the number of
SL-OUT
Section 3-5
min [ms]
max [ms]
0.6
2.2
1.4
4.4
3.4
11
57
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