Omron GRT1-PNT - DATASHEET 2 Operation Manual page 79

I/O communication characteristics
Slice Bus Communication
Cycle Time (T )
SL
Communication unit
processing time (T
SL-CI
T )
SL-CO
Slice Bus Communication
Time (T and T
SL-IN SL-OUT
Measurement tables
Measured input time for
8 ms update rate
Measured output time for
8 ms update rate
Measured input time for
16 ms update rate
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 PROFINET IO Communication Unit processing time is the time required
and
for software processing in the Communication Unit.
The SmartSlice bus communication time is the time required to communicate
) with an Input Unit (T
System.
T , T , T
SL SL-CI SL-CO
SmartSlice I/O Units as well as on the amount of I/O data per SmartSlice I/O
Unit. The example below presents an indicative measure for the time required
to process PROFINET IO output data.
The measurement tables shown below in this section give an indication of the
PROFINET IO timing. The times are defined as follows:
• The input time is measured as the time between the moment an input is set
at one of the Slice I/O Units and the moment the input data arrives at the
PROFINET IO Controller.
• The output time is measured as the time between the moment the
PROFINET IO Message is sent by the IO Controller and the moment it is
physically set at one of the Slice I/O Units.
For the measurements two Slice I/O Unit configurations are considered:
• A small SmartSlice I/O configuration containing a single GRT1-ID4-1 and a
single GRT1-OD4-1.
• A large SmartSlice I/O configuration containing the maximum of 64
different GRT1 SmartSlice I/O Units.
/i
2 I/O Units
64 I/O Units
/i
2 I/O Units
64 I/O Units
/i
2 I/O Units
64 I/O Units
) or Output Unit (T
SL-IN
, T and T
SL-IN SL-OUT
Minimum (ms Maximum (ms)
4.8 18.2
4.8 20.8
Minimum (ms) Maximum (ms)
5.5 23.3
6.1 23.3
Minimum (ms) Maximum (ms)
5.8 26.4
6.1 28.1
Section 3-6
) in the SmartSlice I/O
SL-OUT
strongly depend on the number of
Typical (ms)
10.7
12.0
Typical (ms)
13.2
13.2
Typicl (ms)
14.6
17.6
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