Volatile and non-volatile parameters in the object dictionary
9.4 Volatile and non-volatile parameters in the object dictionary
Parameters in the KEB object dictionary are stored either permanently in the device (non-
volatile) or until the next reset (volatile).
Read-only parameters display only the actual operating state and are therefore only
stored in volatile memory.
Additionally some parameters must always be set to a defined start value at power on
(hardware reset). These parameters are also only stored volatile.
The following parameters must be set to a defined start value after power-on:
Parameter changes, not yet confirmed by dr99
Setpoint settings (target, offset)
co15, co16, co17, co18, co19
external source for output
external source for input
position control parameters
fb10, error displays fb21…fb31
SACB diagnosis parameters (sb group)
All other parameters that are not changed for longer than approx. 80ms are permanently
stored in the device.
The device requires approx. 2.5 seconds to check which parameters must be stored. The
longest time from changing a parameter to saving it in the non-volatile memory takes
about 2.5 seconds.
The F6 / S6 devices store changed parameters automatically non-volatile
when the 24V supply voltage is switched off. The time still available for storing
the parameters depends on the load of the voltages.
This time is not always sufficient to save all parameters. Therefore, the data is
always automatically stored in the background, even during operation. Due to
the slower storage medium, only data such as error and operating hours coun-
ters are stored on the VARAN card.
In order to receive a feedback after a parameter download when the saving of
the parameters is completed, each parameter list should be completed by writ-
ing co07 = 0 and then co07 = 1.
The second write access is only acknowledged positively when saving is com-
plete.
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