CAN-CBX-AI420 - esd electronics, Inc.

8.9.2 Sample Rate Set Point (2310 h)
Index
[Hex]
2310
Subindex
[Dec.]
Description
Manufacturer Specific Profile Area
Value range
[Hex]
Default
[Dec.]
Data type R/W
0 Number of entries 1 1 unsigned 8 ro
1 Sample_Rate_Set_Point 82...14FC
*) 4994 5 ms; divided by 2, because of two channels (Default-PDO-Mapping) = 2.5 ms
4994 =>
2.5 ms *)
unsigned 16 rw
This object transfers the setpoint of the sample rate. The setpoint is evaluated for the setting of the
sample rate of all four A/D-channels. The smaller the sampling rate is chosen, the higher is the
resolution of the measured values reached.
The sample rate a channel reaches depends among the setpoint specification essentially on further
parameters:
Sample_Rate_per_Channel = f (PDO-Mapping, Chop Mode)
If e.g. the A/D-data of two A/D-channels are transferred (default setting) on one TxPDO, so the sample
rate is halved for each of these channels. If a different chopping-mode is chosen for two channels, the
resulting sample rates will be different. The connections between sample rate and chopping-mode can
be taken from the data sheet of the A/D-converter AD7732 (e.g. under www.analog.com).
To check the resulting actual value, it can be read via object 2311 h.
Assignment of the variable Sample_Rate_Set_Point:
The setpoint of the sample rate can be set in 0.5 s steps:
Value of the variable
Sample_Rate_Set_Point _x
[Hex]
Setpoint of the sample rate
(at 2 A/D-channels per TxPDO)
82 65 s
83 65.5 s
: :
1382 2500 s (Default)
: :
14FC 2686 s
Note: The table above shows the technically reasonable limit values.
CAN-CBX-AI420 Manual Rev. 1.3 71