Testing A String Parameter - HEIDENHAIN TNC 640 User Manual

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Testing a string parameter

The INSTR function checks whether a string parameter is contained

in another string parameter.

Select Q-parameter functions

Press the FORMULA soft key

Enter the number of the Q parameter for the

result and confirm with the ENT key

The control saves the place at which the text

to be searched for begins. It is saved in the

Shift the soft-key row

Select the function for checking a string

Enter the number of the QS parameter in which

the text to be searched for is saved. Confirm

with the ENT key

Enter the number of the QS parameter to be

searched for by the control, and confirm with the

Enter the number of the place at which the

control is to start search the substring, and

confirm with the ENT key.

Close the parenthetical expression with the ENT

key and confirm your entry with the END key

The first character of a text string starts internally at the

If the control cannot find the required substring, it

will save the total length of the string to be searched

(counting starts at 1) in the result parameter.

If the substring to be searched for appears multiple

times, then the control returns the first place at which it

finds the substring.

Example: Search through QS10 for the text saved in parameter

QS13. Begin the search at the third place.

N37 Q50 = INSTR ( SRC_QS10 SEA_QS13 BEG2 )

Programming Q Parameters | String parameters

HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017