[Cause]
The target position of the pressure equalizing motion has not yet been calculated.
[Countermeasure]
1. Check whether EQTCHPOS was called before the pressure equalizing motion started. If it has not been called, add a statement that calls EQTCHPOS before the pressure equalizing motion starts.
2. If, at the time of the execution of EQTCHPOS, SRVO-440 and other alerts have already occurred, the reasons for these alerts have first been excluded in order to avoid their occurrence.