Siemens SINUMERIK 840D sl Programming Manual page 391

Nc programming

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$ + 1. Letter

Whether machine and setting data is treated as preprocessing or main run variables depends on

whether they are written with one or two $ characters. The notation is freely selectable for the specific

application.

When an R-parameter is used in the part program/cycle as a preprocessing variable, the prefix is

omitted, e.g. R10. When it is used in a synchronized action as a main run variable, a $ sign is written as

a prefix, e.g. $R10.

Supplementary conditions

Exceptions in the prefix system

The following system of variables deviate from the prefix system specified above:

● $TC_...: Here, the 2nd letter C does not refer to channel-specific system variables but to

toolholder-specific system variables (TC= tool carrier).

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

Use of machine and setting data in synchronized actions

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

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

preprocessing run or the main run.

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

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

ID=1 WHENEVER $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:

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

Writing machine and setting 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.

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Sinumerik 840de sl