Cyclic And Acyclic Data - Siemens SITOP PSU8600 Manual

Engineering and remote access

7.6 Cyclic and acyclic data

7.6 Cyclic and acyclic data
The data communicated between the power supply system and the PROFINET IO-Controller
can be viewed in the STEP 7 or STEP 7 in the TIA Portal. Here, a distinction is made
between cyclic data (input/output data) and acyclic data (reading/writing data sets).
Cyclic data (input/output data)
The SITOP PSU8600, the expansion modules and the buffer modules send data - in cyclic
intervals (5 ms to 128 ms) - about the actual operating states to the PROFINET IO-
Controller. Further, value changes from the PROFINET IO-Controller can be transferred to
the SITOP PSU8600 in cyclic intervals (5 ms to 128 ms) . Additional information on this topic
is available under Input data (Page 193) and Output data (Page 195).
Secondary conditions relating to actual values:
Actual values from the device are updated via the cyclic input data of the control within
10 ms, if one of the following conditions are satisfied:
● for an output voltage change at the basic device> 0.5 V
● for an output voltage change at the expansion modules > 1 V
● for an output current change at the basic device > 0.5 A
● for an output current change at the expansion modules > 1 A
The actual values are updated every 200 ms, if none of the conditions listed above are
satisfied.
Secondary conditions relating to setpoint values:
Setpoints, which are transferred via the cyclic output data of the control to the device, are
active within 10 ms.
Exception: output voltage setpoint changes < 150 mV only become active after 100 ms aktiv.
Acyclic data (reading/writing data sets)
Reading and writing data sets (maximum size: 4 kB) are sent in acyclic intervals from the
SITOP PSU8600, the expansion modules and the buffer modules to the PROFINET IO-
Controller or from the PROFINET IO-Controller to the power supply system. You can find
additional information at Reading and writing data sets (Page 201).
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PSU8600power supply systems
Manual, 04.2016, A5E35883207-7-76