Manual restart during block search

JogOfPath

Manual restart to the contour (see Phase (4) “Pre-return to contour“) by means of an NC program can also be executed by a JogOfPath channel. Switchover between restart channel (JogOfPath) and block search channel always takes place when the axes are at standstill (see FCT-C15 Jog of path).

Block search may take longer if the program is rather large. Manual restart using a JogOfPath channel has the advantage that it can still be executed after block search has already started. In this case, it must be completed by the PLC before automatic restart to the contour is enabled (see Phase (6)).

Restart using any NC program can be used to start the contour via any strategy. By contrast, automatic restart only takes places by direct linear motion.

Restart to the contour
Restart to the contour

Sequence

  1. Normal program start
  2. Program interrupt and channel reset
  3. Move to any position
  4. Switchover to JogOfPath and start program in block search channel
  5. Start manual start program in JogOfPath channel
  6. Switchover to block search channel and enable restart by PLC
  7. Automatic restart of residual path difference

Remark: As opposed to starting on a JogOfPath channel, manual restart in a block search channel can only take place before the block search starts.

Notice

notice

Channel block search can be started even though the channel axes are still released to the JogOfPath channel (PLC sets HLI.channel.SuspendAxisOutput).

The flow diagram below shows a manual restart to the contour executed by a JogOfPath channel before the PLC enables START. Before the block search channel continues, channel output is switched back to the block search channel
(HLI.BlockSearchChannel.SuspendOutput = FALSE,
HLI.JogOfPathChannel.SuspendOutput=TRUE).

Sequence of block search and completion of manual restart
Sequence of block search and completion of manual restart