ElmoMC SimplIQ Digital Servo Drives-Bell Command Reference - Manual (Page 308)

10.1.5 Trigger Events and Timing
The recorder is started by a trigger event, which is one of the following:
Immediate: The recorder starts immediately after the recording request has been
issued.
Begin motion: The recorder is triggered by the execution of a software BG
command, by a timed BG command, or by a hardware command.
Analog signal: The recorder starts upon one of the following:
Positive slope: The signal crosses a prescribed level with a positive slope.
Negative slope: The signal crosses a prescribed level with a negative slope.
Window: The signal exits a window of two prescribed signal levels.
The following graph depicts the analog signal trigger types:
1 2 3 4 5 6 7
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
Trigger signal (not necessarily recorded)
Level 1
The trigger
occurs here if set
for negative slope
The trigger
occurs here if set
for positive slope
Level 2
The trigger
occurs here if set
for window
Figure 10-1: Slope and Window Trigger Types
Digital signal: The SimplIQ drives will support this trigger option in the future.
The trigger defines when the recorder is to start. The recorder can be programmed to
start before the trigger event, so that the trigger event can occur “in the middle of the
action.” This is possible because the recorder begins to record at the instant it is
launched by the RR command, so that when the trigger event occurs, the pre-trigger
information is already recorded.
Example:
The signal to be recorded is speed, and the trigger is set on BG. After launching the
recorder with
RR=3
, the following command sequence is given:
JV=5000;BG
.
The following graph depicts the pre-trigger delay:
SimplIQ for Steppers Application Note Development Aids
MAN-STECR (Ver. 1.1)
109