Siemens SIMATIC S7-300 Reference Manual page 307

Requirements
• The DP-Master and DP-Slave must support the synchronicity. They require
STEP 7 from Version 5.2.
Module filtering mode: Synchronicity
In synchronous operation the following conditions apply:
Standard Mode
Filter and processing time T
and loading it into the transfer buffer
(the specified value for T
the diagnosis)
including an input delay time of
T
DPmin
Diagnostic interrupt
Fast Mode (only possible with 6ES7331-7HF01-0AB0)
Filter and processing time T
and allocation in the transfer buffer
(diagnosis not selectable)
including an input delay time of
T
DPmin
Note
By using "Fast Mode" the cycle of the DP system can be accelerated. However,
this is at the expense of the diagnosis: The diagnosis is switched off in this
operating mode.
Together with the calculation and transfer times required on the IM 153, the
specified value for T
875 ms for T
The specified value for T
slave/IM 153: If there are a number of different plugged in modules, the slowest
module determines the time T
Note
In "Synchronous" mode, independent of the parameterization made in STEP 7, the
module always sets itself to "Integration time: no /parasitic frequency". The
"hardware interrupt" functionality is not possible in "Synchronous" mode.
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
between reading the current value
WE
applies, independent of the activation of
WE
between reading in the current value
WE
results in the minimum settable value of HW Config of
WE
.
i
is dependent on the extent of extension of the DP
DPmin
DPmin
.
Analog Modules
max. 625 ms
10 ms
3.5 ms
max. 4 x T
DP
max. 625 ms
10 ms
1 ms
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