Submit Programs - HEIDENHAIN TNC 426 PB/M Technical Manual

Table of Contents

7.10 Submit Programs

December 2001

Submit programs are subroutines that the PLC submits to the NC for

processing. This allows you to solve problems that are very processor-

intensive, require program loops, or must wait for external results. It is a

prerequisite that these programs are not restricted to a definite time frame.

Depending on processor utilization, the TNC provides for a submit program a

certain percentage of its computing power—at least 5%. You start submit

programs from the PLC program. They can access all data memory areas (M/

B/W/D) as the main program can. To prevent problems, ensure that data

processed by the PLC program are clearly separated from data processed by

the submit program. You can place up to eight submit programs in a queue.

Each submit program receives an "identifier" (a number between 1 and 255,

assigned by the NC), which the TNC enters in the word accumulator. With this

identifier and the REPLY function you can then interrogate whether the

program is in the queue, is being processed, or has already been processed.

The TNC processes the submit programs in the sequence in which they were

entered in the queue. If errors occur during execution of the submit program,

the NC sets the following markers:

Overflow during multiplication

Division by 0

Incorrectly executed modulo

Error status for PLC module

Reserved for errors that the PLC

programmer would like to catch

The TNC lists these markers separately in the submit job. This means that you

can edit the same markers as those in the PLC sequential program without

interfering in its execution. No exact times can be stated for the commands

for managing the submit queue. The processing times given in Chapter 7.7.2

are maximum values.

Submit Programs