Delta RMC101 User Manual download pdf (Page 644)

100

101

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.

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