Motion Control

[AJZ]

A four axis 1769-L43 with SERCOS based has been working fine for almost a year. All motors are MPL with multi-turn absolute encoders Then one morning all axisname.AbsoluteReferenceStatus bits were off. The encoders were still reading the correct value. Just moved the axis to the absolute home position using motion direct command and performed a MAH using motion direct commands.

WHat can cause the system to loose all  axisname.AbsoluteReferenceStatus bits at the same time?

[fuzzy_logic]

Just trying to help, as I'm not an expert on this

Aid 47351 reports the cases where the bit is either set or reset.

After that, you may consider three cases where a problem could be in the code:

1. MAH (Motion Axis Home) repeated more than once in code, thus resetting the absolute position reference.
2. MRP (Motion Redefine Position) repeated more than once in code, thus resetting the absolute position reference.
3. Changing from Linear to Rotary mode within the code.

Double check if you're in one of these cases, then take the appropriate actions to solve.

If you are not in those cases, please post again so that other folks here will have the possibility to help you more....

- fuzzy logic

[AJZ]

The drives are Kinetix6000.

There are no MAH or MRP instructions in the code. I use 'motion direct commands' to set the absolute position reference.

[sdfs]

In the event of an E73 or E76 fault when control power is removed from the system, the absolute reference bit will be cleared on AM modules. Note that these faults are rare and are typically caused by hardware failures or bent pins on the power rail.