Omron PROFINET IO CJ1W-PRM21 Operation Manual page 125

Performance
Note
7-5-2 Input / Output data processing time
140
Minimum
120
Typical
Maximum
100
80
60
40
20
0
8
• The maximum of 55 devices in maximum configuration is caused by
the reaching the limit of 7168 Words that the IO Controller can
exchange with the PLC CPU.
• The maximum number of IO Devices that the IO Controller supports
is 126.
The IO Controller is packing and unpacking the I/O data transferred between
PLC memory and the network. The time it needs for this is called the data
processing time.
There are two directions through the IO Controller, for input data and output
data respectively.
• The input data processing time (TCI) is the time between the moment the
input data is received by the IO Controller from the PROFINET network
and the moment the IO Controller has the input data ready for the PLC.
• The output data processing time (TCO) is the time between the moment
the output data is supplied by the PLC and the moment the IO Controller
has the output data ready to send onto the PROFINET network.
Measurements were made with minimum, typical and maximum IO Device
configurations to determine these times.
/i
Network
Configuration
Lower limit
Minimum 3.9
Typical 4.8
Maximum 24.5
Minimum network configuration: One SmartSlice IO Device connected, with
the minimum configuration (see above)
CJ1W-PNT21
16 32 64
Update rate (m s)
Figure 7.19: Performance
T (ms)
ci
Upper limit
5.2
6.4
45.0
Section 7-5
128 256 512
T (ms)
co
Lower limit Upper limit
1.1 2.1
2.0 4.0
15.0 40.6
109