Interface module IM 157-1 PN (6ES7157-1AB00-0AB0)
Manual, 12/2016, A5E32347036-AD
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The figure below shows the cycle times at ET-Connection based on the number of I/O
modules with a Profinet send clock of 0.5ms.
Figure B-1 Cycle times
The cycle time at ET-Connection is synchronized with the PROFINET send clock. This
means that the input data of the I/O modules are transmitted via ET-Connection without
further delay (wait time in the interface module) via PROFINET. The output data from
PROFINET is also transmitted without further delay via ET-Connection to the I/O modules.
Thus, the cycle time of the ET-Connection, based on then number of I/O modules, is always
a multiple of the configured PROFINET send clock.
The chart shown above shows the trend for a send clock of 0.5 ms. With larger send clocks,
the gradation of the trend changes according to the send clock.
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