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Response times
Response times
The time that elapses between an IO controller writing to the process image outputs and
when this data can be read in the process image of the second IO controller depends on the
following:
• CPU cycle time of the two IO controllers
• Bus cycle time of the associated IO controller
• Duration for copying within the PN/MF Coupler (T
• Total data length in bytes (input/output)
The copying duration of the PN/MF Coupler is independent of the data transmission rate
used. It consists of the copy routine for the inputs and for the outputs. The following
maximum values apply:
T
COPY
• nIN: Number of bytes of inputs
• nOUT: Number of bytes of outputs
• nSUB: Number of submodules used
Influencing factors for the response times
The following applies to time-critical applications:
• Divide the data among as few modules and submodules as possible.
• Exchange as little data as possible via the PN/MF Coupler.
• Do not request diagnostic data from the IO controller.
• Do not activate the data validity display DIA.
• Do not activate the data validity diagnostics.
PN/MF Coupler
Hardware Installation and Operating Manual, 07/2020, A5E50018670-AA
= 25 µs + nIN x 0.06 µs + nOUT x 0.03 µs + (nSUB-1) x 3.5 µs
)
COPY
C
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