01/2007
8.3 Creating a PROFIBUS configuration
8-187
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
After synchronization to the isochronous DP cycle has been activated for all DP
slaves, the timer requirement of the cyclic portion of DP communication must be
calculated.
Calculation is performed by the DP master on activation of the isochronous bus
cycle.
Tab: General
Group box: Station/Master System
Button: ”PROFIBUS...”
Dialog box: Properties – PROFIBUS interface SINAMICS ...
Tab: Parameter
Button: ”Properties...”
Dialog box: Properties PROFIBUS
Tab card: Network settings
Button: ”Options...”
Dialog box: Options
Radio button: Activate isochronous bus cycle
When calculating the cyclic portion of the PROFIBUS communication, the time
for the isochronous DP cycle is automatically changed to the time required as
the minimum. This change must be undone by reentering the time intended for
the isochronous DP cycle.
Group box: Isochronous time in ms
Isochronous DP cycle: Equidistance time
OK
OK
OK
CablesEquidistance
Activate isochronous bus cycle
Number of PGs/OPs/TDs on the PROFIBUS
00Configured: Total:
Graduation:
2.000
Details ...
Options
Recalculate
ms ms
0.125
Synchronization of the slaves
Times Ti and To same for all slaves
(If not: Set in properties – slaves)
Optimize DP cycle (and, if nec. Ti, To):
Isochronous DP cycle:
(min = 1.000 ms; max = 32.000 ms)
Fig. 8-8 Dialog box: Options (excerpt)
Equid. master cycl.
component
T
DX
Dialog box:
Continuation
Isochronous DP
cycle T
DP
Dialog box:
Continuation
8 PROFIBUS DP Communication
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