Q Parameter Programming - Error Check

Hi

Can anyone help me with the following issue.

I have a number of new trainees that are doing basic setting up and operating milling machine.
We have had a couple instances where a trainee has machined the bed by not setting Z correctly.

I would like to come up with some coding to stop this from happening but not sure where to start.
I assume you can pull data for the tool length from the tool table and then take the actual machine co-ordinates to specify bed location.

Controller - iTNC530

If anyone can help it would be really appreciated.

Thank you


Matt

Data transfer NC > NC program (FN18: SYSREAD)
The FN18: SYSREAD function is particularly useful for OEM cycles if you wish to have access from the NC program to certain NC data, such as active tool compensation. A group number, a system data number, and an index specify the particular item of system data that you read:
FN18: SYSREAD Qxxx = IDxxxx NRxxxx IDXxxxx (xxxx: Q parameter or numerical value)

Examples:
FN18: SYSREAD Q1 = ID50 NR1 IDX4
Q1 = T4 Tool length L

FN18: SYSREAD Q1 = ID50 NR1
Q1 = Current Tool length L