Siemens Sinumerik 840D Operating Turning page 126

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Calculation variables R

Value assignment by means of calculation operations:

The use of calculation variables and their linkage in mathematical functions

provides many means in programming.

Since the control evaluates a certain number of blocks in advance, errors

can creep in when mathematical operations are carried out.

For this reason program the code "STOPRE" before the calculation of vari-

ables as shown in block N120. This command stops the advance evalua-

tion until all stored blocks have been completed.

N10 G18 G54 G64 LIMS=3500

N30 R1=20 R2=50

N80 R10=R1+R2

N90 R11=SIN(45)

N100 R12=R1+2

N120 R13=R13/10

The editor extract shown here demonstrates only a small selection of the

possible calculation operations.

Refer to the manual of your control unit regarding the actually available

To preserve the clarity it is sensible to describe a variable only once.

For the use of the calculation functions the usual mathematical rules apply.

Values in parenthesis take priority in calculation.

Without a paranthesis, multiplication/division is always carried out before

the addition/substraction.

; Value assignment

; Advance evaluation stop

; Calculation instruction

; R10 derives from R1+R2 (value 70)

; R11 results in the sin of 45° (value 0.707)

; R12 results in 22

; R13 takes on the value of R1

; The new R13 derives from the old

; R13 divided by 10 (value 2)

840D/828D SINUMERIK Operate

Sinumerik 828d