Siemens alarm 4110: IPO cycle changed to %1 ms
SINUMERIK NCK general alarm · Siemens 840D/810D powerline
What it means
The interpolation (IPO) cycle divisor was set to a value that is not an integral multiple of the position-control cycle divisor, so the NCK automatically increased the IPO ratio via MD10070 $MN_IPO_SYSCLOCK_TIME_RATIO. The message reports the new IPO cycle time now in effect. It is a configuration notice rather than a hardware fault, but program velocity/acceleration behaviour changes accordingly.
Likely causes
- Servo/IPO cycle machine data changed to incompatible values
- Commissioning archive from another machine variant imported
- Kernel version change altering default cycle ratios
Triage note: Verify MD10050 $MN_IPO_SCALING_VALUE_INVERSE and related cycle MDs if the new IPO time is unacceptable.
Need the part urgently?
Send us alarm 4110 with your machine details — typical RFQ turnaround is 24–48h.