Siemens SINUMERIK 828D Programming Manual page 18

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Flexible NC programming

1.1 Variables

General conditions

Exceptions to the rules of the prefix system

The following system variables deviate from the rules of the prefix system described above:

● $TC_...: Here, the second letter C does not refer to channel-specific system variables but

● $P_ ...: Channel-specific system variables

Use of machine and setting data in synchronized actions

When machine and setting data are used in synchronized actions, the prefix can be used to

define whether the machine or setting data will be read synchronous to the preprocessing

run or the main run.

If the data remains unchanged during machining, it can be read synchronous to the pre-

processing run. For this purpose, the machine or setting data prefix is written with a $ sign:

Program code

ID=1 WHENEVER G710 $AA_IM[z] < $SA_OSCILL_REVERSE_POS2[Z]–6 DO $AA_OVR[X]=0

If the data changes during machining, it must be read/written synchronous to the main run.

For this purpose, the machine or setting data prefix is written with two $ signs:

Program code

ID=1 WHENEVER $AA_IM[z] < $$SA_OSCILL_REVERSE_POS2[Z]–6 DO $AA_OVR[X]=0

Writing machine data

When writing an item of machine or setting data, it is important to ensure that the access

level which is active when the part program/cycle is executed permits write access and that

the data is set to take "IMMEDIATE" effect.

A list of the properties of all system variables appears in:

/PGA1/ Parameter Manual, System Variables

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