Siemens SINUMERIK 840D

10
08.97 Motion-Synchronous Action
10.4 Actions within s
y
nchronized actions
10
840D
NCU 572
NCU 573
840Di

Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
10-367
10.4.9 Evaluation function SYNFCT
Programming
SYNFCT(Polynomial_No., real-time variable output, real-time variable
input)
Explanation
Polynomial_No.
With polynomial defined with FCTDEF
(see Subsection "Polynomial definition").
Real-time variable output
Write real-time variable
Real-time variable input
Read real-time variable
Function
SYNFCT reads real-time variables in synchronism
with execution (e.g. analog input, actual value, ...)
and uses them to calculate function values up to the
3rd degree (e.g. override, velocity, axis position, ...)
using an evaluation polynomial (FCTDEF). The
result is output to real-time variables and subjected
to upper and lower limits with FCTDEF (see Section
10.4.7).
As real-time variables, variables can be selected and
directly included in the processing operation
•
with additive influencing
•
with multiplicative influencing
•
as position offset.
Application
The evaluation function is used
•
in AC control (Adaptive Control)
•
in laser output control
•
with position feedforward