Siemens SINUMERIK 840D sl Commissioning Manual page 260

Tips
13.11 PROFIBUS machine control panel on the HMI
Figure 13-33 Properties of the PROFIBUS interface
5. Click on "Options" and then on the "Equidistance" tab (see figure below).
Figure 13-34 Equidistance
6. To enable reproducible access to peripherals (for hand wheel mode), the PROFIBUS DP
must have constant bus cycle time. The following entries are necessary under
Equidistance:
7. Click on "OK" three times.
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– Click on the "Activate equidistance bus cycle" field
– Enter the cycle, e.g., "2 ms" for the "Equidistance DP cycle" (for integrated
PROFIBUS) (see MD10050 Syscock_Cycle_Time).
– Click on the "Times Ti and To equal for all slaves" field
– The fields "Time Ti" and "Time To" must contain a value "< 2ms".
Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
IBN CNC: NCK, PLC, drive