Supplements to ET 200SP documentation
2.3 Interface module manuals
Product information on the documentation of the ET 200SP distributed I/O system
Product Information, 09/2019, A5E03799595-BD
33
IM 155-6 PN ST Manual, Edition 04/2017
Response times
The response time of the IM 155-6 PN ST is made up of:
● Backplane bus cycle time
● Operating system processing
Note
Validity of the formula
The following formula applies to the ET 200SP backplane bus.
The formula does not apply to the ET-Connection bus.
Backplane bus cycle time
The backplane bus cycle time is the time the interface module requires to output new output
data, read new input data and then copy the data to the PROFINET send buffer.
The backplane bus cycle time is the result of the update time configured for the interface
module as IO device and amounts to at least 1 ms.
● If the configured update time ≥ 1 ms, the backplane bus cycle time is equal to the
configured update time.
● If the configured update time < 1 ms, the backplane bus cycle time is the product of an
integer multiple of the configured update time.
Table 2- 2 Example calculation
Backplane bus cycle time (integer multiple, minimum 1 ms)
Operating system processing time
The operating system processing time is calculated based on the following formula:
Operating system processing time output
Operating system processing time_output[μs] = 147 + 3.775 number_m + 0.275 bytes_out
Operating system processing time input
Operating system processing time_input[μs] = 158.3 + 2.325 number_m + 0.325 bytes_in
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