Computation Cycles, Time Delay - Siemens 6RA7086-6KS22 Operating Instructions Manual

Function descriptions
Data sets
See also Section "Switch over parameter sets"
Switch over function parameters (function data sets):
4 different sets of some parameters (function parameters) are available and can be selected by
means of the "Switch over function parameters" function. The switchover operation is controlled by
control word 2 (bits 16 and 17, see Section 8, Sheets G181 and G175). Index .01, .02, .03 or .04 of
these parameters is operative depending on the status of the control bit.
The parameters of this parameter set are identified by an ".F" next to the parameter number in the
function diagrams and by "FDS" under the parameter number in the tabulated parameter list.
The parameters belonging to the function parameter set must not be confused with other parameters
which, by chance, also have 4 indices. The latter parameters are not affected by the "Switch over
function parameters" function.
Switch over binector and connector parameters (Bico data sets):
2 different sets of some selection switches are available and can be selected by means of the "Switch
over binector and connector parameters" function. The switchover function is controlled by control
word 2 (bit 30, see Section 8, Sheets G181 and G175). The status of the control bit determines
whether index.01 or index .02 of the parameter is operative.
The parameters of the Bico data set are identified by a ".B" next to the parameter number in the
function diagrams and by "BDS" under the parameter number in the tabulated parameter list.
The parameters belonging to the Bico data set must not be confused with other parameters which, by
chance, also have 2 indices. The latter parameters are not affected by the "Switch over binector and
connector parameters" function.
Display parameters
The values of certain signals can be output using display parameters (r parameters, n parameters).
Connector displays (Section 8, Sheet G121) can be used to link all connectors with display
parameters so that they can be displayed.
Representation in function diagrams:
Apart from the parameter number, the function diagrams may also include a function description for
the parameter as supplementary information.
RFG status
r316
9.2

Computation cycles, time delay

Functions associated with analog inputs, analog outputs, binary inputs, binary outputs and interfaces,
as well as function blocks associated with the motorized potentiometer, setpoint generation, ramp-
function generator and closed-loop speed and armature current controls, are called up and calculated
in synchronism with the armature firing pulses (i.e. every 3.333 ms at a line frequency of 50 Hz).
Function blocks associated with the closed-loop EMF and field current controls (shown in Section 8,
Sheets G165 and G166) are called and calculated in synchronism with the field firing pulses (i.e. every
10 ms at a line frequency of 50 Hz).
The parameter settings are processed in a further computation cycle with a cycle time of 20 ms. The
execution of optimization runs is also controlled from this cycle.
With regard to the transfer of parameter values via interfaces, it is important to remember that some
transferred parameters must be converted to this 20 ms cycle before they can be applied, for
example, in the armature firing pulse cycle.
9-6
Display parameter
Parameter number = r316
Display of RFG (ramp-function generator) status
SIEMENS AG
SIMOREG DC Master Operating Instructions
05.05
6RX1700-0AD76