Siemens S7-300 - Page 138

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
9-26 A5E00203919-01
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As an alternative to the MPI interface, you can program the CPU or execute the
Status and Modify functions of the PG via the PROFIBUS-DP interface.
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The use of the Status and Modify functions via the PROFIBUS-DP interface
extends the DP cycle.
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As of 67(3 V 5.x you can configure equidistant lengths for PROFIBUS subnet
(constant bus cycle time) bus cycles. Details on equidistance are found in the 6WHS
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Customize the start-up monitoring time for
DP slaves in parameter 0RQLWRULQJWLPH
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Customize the start-up monitoring time for
DP slaves in parameters 0RQLWRULQJWLPH
IRUSDUDPHWHUWUDQVIHUWRPRGXOHV and
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That is, the DP slaves must start up within the set time and be configured by the CPU (as
DP master).
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With CPU 31x-2 DP, do not set  as PROFIBUS address.