Commander SK Advanced User Guide
9
Issue Number: 9 www.controltechniques.com
3.4 Sources and destinations
3.4.1 Sources
Some functions have source parameters, i.e. drive outputs, PID controller etc. The source parameter range is Pr
0.00
to Pr
21.51
.
1. If the source parameter does not exist the input is taken as zero.
2. The input is given by (source value x 100%) / source parameter maximum.
3.4.2 Destinations
Some functions have destination parameters, i.e. drive inputs, etc. The destination parameter range is Pr
0.00
to Pr
21.51
.
1. If the destination parameter does not exist then the output value has no effect.
2. If the destination parameter is protected then the output value has no effect.
3. If the function output is a bit value (i.e. a digital input) the destination value is either 0 or 1 depending on the state of the function output. If the
function output is not a bit value (i.e. analog input) the destination value is given by (function output x destination parameter maximum) / 100%
rounded down. Pr
1.36
and Pr
1.37
are a special case. The scaling shown in the description of Pr
1.10
is used when any non-bit type quantity is
routed to these parameters.
4. If more than one destination selector is routed to the same destination, the value of the destination parameter is undefined. The drive checks for
this condition where the destinations are defined in any menu except menu 15. If a conflict occurs a dESt trip occurs that cannot be reset until the
conflict is resolved.
Setting a source or destination parameter to Pr
0.00
will disable the parameter.
3.4.3 Sources and destinations
1. Bit and non-bit parameters may be connected to each other as sources or destinations. The maximum for bit parameters is taken as one.
2. All new source and destination routing only changes to new set-up locations when the drive is reset.
3. When a destination is changed, the old destination is written to zero, unless the destination change is the result of loading defaults or transferring
parameters from a SmartStick. When defaults are loaded the old destination is set to its default value.
4. Cannot select any of the 32 bit parameters.
3.4.4 Parameters actioned on exit of edit mode and on drive reset
Some parameters (Pr
6.04
, Pr
11.27
, Pr
11.42
, Pr
11.43
and Pr
12.41
) are updated on exit from mode or on a drive reset. Serial access to these
parameters must be followed by a reset. Pr
6.04
, Pr
11.27
and Pr
12.41
are only actioned on a reset when the value has changed.
3.5 Sample/update times
The sample/update times shown in the control terminal specification within the
Commander SK Technical Guide
are the default sample/update times
for the default terminal set-up. The sample/update time depends on the destination/source parameter of the digital or analog inputs/outputs.
These sample/update times are the sample or update times for the control microprocessor. The actual sample/update time maybe slightly longer due
to the design of the Commander SK.
3.5.1 Task routine times
At the beginning of each menu, there is a single line parameter description and this contains the update rate for each parameter. This time signifies
the task routine time in the software that the parameter is updated on. For a background task, the time depends on processor loading i.e. what
functions the drive is carrying out and what advanced menus are being used.
From practical tests carried out:
Update rate
Microprocessor update time
Comments
2ms
2ms
Updated every 2ms
5ms
5ms
Updated every 5ms
21ms
21ms
Updated every 21ms
128ms
128ms
Updated every 128ms
Reset
N/A
Destination/source parameter changed on a Reset
B
Background
Updated as a background task. Update rate
depends on processor loading.
BR
Background read
BW
Background write
Edit mode exit
N/A
Parameter change actioned on exit of edit mode.
Parameter change automation saved.
Condition
Minimum
Maximum
Average
Time for drive to respond to a run command
4.1ms
5.62ms
5.02ms
Time for the drive to respond to a stop command
2.82ms
3.94ms
3.31ms
Time for the drive to respond to a step change in analog input
voltage
7.93ms
NOTE
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