Omron GRT1-PNT - DATASHEET 2 Operation Manual page 78

I/O communication characteristics
Maximum I/O Response
Time
PROFINET IO
Communication Cycle
Time (T )
RM
Refresh time (T )
RF
66
Note Refer to the GRT1 Series SmartSlice I/O Units Operation Manual for details on Input
Unit's input delay times and Output Unit's output delay times.
The maximum I/O response time (T
T = T + 2∗T
MAX IN
where:
T :The Input Unit's ON (OFF) delay
IN
T :The maximum I/O response time
MAX
T :The Output Unit's ON (OFF) delay
OUT
T :The PLC's cycle time
PLC
T :The PLC's PROFINET IO Unit refresh time
RF
T :The entire PROFINET IO communication cycle
RM
T :The SmartSlice bus communication cycle time
SL
T :The SmartSlice Communication Unit's input data processing time
SL-CI
T :The SmartSlice Communication Unit's output data processing time
SL-CO
PLC
PROFINET
Communications Unit
SmartSlice bus
Input Unit
Output Unit
Note Refer to the GRT1 Series SmartSlice I/O Units Operation Manual for details on Input
Unit's input delay times and Output Unit's output delay times.
The PROFINET IO communication cycle time is the time from the completion
of a IO Device's remote I/O communication processing until remote I/O
communication with the same IO Device are processed again. The
communication cycle time is used to calculate the maximum I/O response
time.
The communication cycle time (T
Update Rate in the configuration of the PROFINET IO Controller Unit. Refer to
the CJ-series PROFINET IO Controller Units Operation Manual (W12E).
The refresh time is the time required to exchange I/O data between the PLC's
CPU Unit and the PROFINET IO Controller Unit. The PLC's cycle time is
increased when an IO Controller Unit is mounted. When an IO Controller Unit
is mounted to the CJ1 PLC, the PLC's cycle time (I/O refreshing) is increased
by the following amount
0.7 + 0.001 x number of words (ms)
The number of words refreshed is the total number of words in the I/O Area
allocated to the IO Devices, including any unused words between the
allocated words.
MAX
+ T + T
SL SL-CI SL-CO
T
T
PLC
RF
T
RM
T
SL-CI
T
SL
T
IN
RM
) is the total of the following terms:
+ 2∗T + 2∗T + T
RM PLC
T T
T T
PLC PLC
RF RF
T
RM
) is defined by the user by means of the
Section 3-6
+ T
RF OUT
T
SL- CO -
T
SL
T
OUT