APPENDIX A - DATA LOGGER
A-1
CDS7324 (FORMERLY LSF-0819)
Rev. A
INSTALLATION & USER’S MANUAL
A.1 Data Logger
The data logger is an internal storage oscilloscope with up to four input channels, trigger function and time base.
It can be used to store fast events or to store information that caused fault conditions. The sampled data can be
downloaded from the embedded controller onto a computer and analyzed.
Normally the data logger functions should be used from within the Moog graphical user interface. The following
description is intended for users that want to implement their own data logger front-end.
A.1.1 Input channels
Up to four input channels can be used to sample any internal 8-, 16-, 24- or 32-bit wide integer or 32-bit and 64-bit
floating point parameter. The channel is enabled by writing the field number to be sampled into
data_logger_channel
(field number 1754) and setting the
data_logger_enable
(field number 1753) parameter to
0x01, where the index into the array is the channel number (0-3). The number of samples to be taken is the
parameter
data_logger_memory_size
(field number 1752). The maximum number of samples that can be taken is
limited by the available memory and depends on the parameters sampled.
The samples are written into an internal memory array in sequential order, e.g. 1
st
sample of first enabled
channel, 1
st
sample of second enabled channel, until all channels are processed and then 2
nd
sample of first
enabled channel 2
nd
sample of second enabled channel and so on. The data cannot be read directly from the
internal memory. There are various parameters available to extract the data from the memory.
internal data logger memory
samples taken
continously
trigger
event
data_logger_memory_size
data_logger_data
DLGDIS (500)
data_logger
sample_number
FigureA.1: data logger memory and sampling
