Upgraded to 2.9 and stuck on 4.6. Add PlasmaC To Base Machine

All of the Cut Parameters except Cut Amps and Kerf Width are read at the beginning of each cut. Changing these values during a cut will have no effect until the next cut.

Cut Amps at this stage is only an indicator for the operator. This will change in the next update as Cut Amps will be available to be used by a Powermax unit using RS485 communications.

Kerf Width is only used if the GCode specifies cutter compensation as shown in here the PlasmaC User Guide

If you have plenty of Z travel then just make the MINIMUM_LIMIT in [AXIS_Z] and the corresponding [JOINT_n] a bit higher for safety but you need to keep it just below the slats.

If you have a restriced Z travel then you may need to change the mechanics of the Z axis to give you more travel.

Is this possible to have touch and go and ohmnic touch or can I just do ohmnic?

If you mean Float Switch plus Ohmic then having both is best then Float will be used as backup if Ohmic doesn't sense.

linuxcnc.org/docs/devel/html/plasma/plas...r.html#ohmic-sensing

Some guys use the circuit I linked to. In that case you edit your <machine>_connections.hal which would have these lines:So ***YOUR OHMIC PROBE*** would be the pin you connect DIGITAL INPUT to and ***YOUR OHMIC PROBE ENABLING CIRCUIT*** would be the pin you connect DIGITAL OUTPUT to.

Some guys are using the next circuit down which requires a THCAD card plus you would need to connect it to a software encoder.
linuxcnc.org/docs/devel/html/man/man9/encoder.9.html

You also need to set the Offset and Retries in the Config Panel plus enable Ohmic in the Run Panel

You should be able to run the THCAD into your parallel port and use a software encoder.
I think Tom has been successful with this.