Spline points downloaded out-of-order, Ssi transducer overflow, Ssi transducer noise – Delta RMC101 User Manual
Page 644: 59 spline points downloaded out-of-order, 60 ssi transducer overflow, 61 ssi transducer noise
RMC100 and RMCWin User Manual
7-20
7.4.58 Resetting the position would cause a position overflow
This error occurs when either a Set Position (Z) or Offset Position (z) command is issued and the
Target or Command position is shifted below the minimum possible position or above the highest
possible position. For the Offset Position (z) command, the positions are offset by the amount
requested by the user. For the Set Position (Z) command, the positions are offset by the
difference between the current Actual Position and the requested position.
For example, suppose that the Target Position is at 3599 position units, the Actual Position is at
3600 position units, and an Offset Position (z) command is issued with a command value of 3600.
This will attempt to move the Actual Position back to 0 and the Target Position back to 1. An error
may or may not be generated, depending on where the position-unit range is defined. If the Offset
is 0 and the Scale is positive, then the position-unit range is from 0 to 65535. A Target Position of
1 is illegal with this range, so this error is generated and the Offset Position (z) command is
ignored. However, if the Offset is 32768, and the Scale is positive, then the position-unit range is
from 32768 to 32767 and the Target Position can be adjusted back to 1. For this reason, we
recommend setting the position-unit range so that the limits are not reached during normal
operation, as is the case with the second position-unit range.
The exact same behavior would happen if a Set Position (Z) command is issued with a 0
command value.
7.4.59 Spline Points downloaded out-of-order
While the Interval Table Format, Interval Table, and Point Count registers from the Spline
Download Area can be downloaded in any order, the Spline Point table must be downloaded in
order, from the first point to the last.
If you feel that you did do this then you may have received this error because one of your
previous downloads was in error. For example, if you downloaded the first 20 points of a 40-point
spline and it had a parameter error then the RMC will expect you to start over your download. If
you continue the download instead, perhaps not checking for the parameter error after the first
download, then you will get this parameter error.
7.4.60 SSI transducer overflow
This parameter error is generated for an SSI/Stepper module when the RMC detects that the
position on the transducer is outside acceptable limits.
7.4.61 SSI transducer noise
This parameter error is generated when the position of an SSI/Stepper module changes by more
than 1/4 revolution in a single control loop.