Siemens SIMOVERT MASTERDRIVES Manual page 178

Functions
RFG output
limitation
7.2.3 Basic positioning
Principle
7-12
♦ Ramp time : scan time < 500
=> max. 1 % error in ramp time
♦ Ramp time: scan time = 1500
=> max. 10 % error in ramp time
♦ Ramp time: scan time > 10000
=> should not be set
♦ Always B- ≤ B+
♦ The upper limit (U370.1) always has higher priority than the lower
limit (U370.2)
The basic positioner can be used for "basic" positioning tasks. It is
implemented using three free function blocks and provides the
necessary operating modes and functionality to move an axis from A to
B under position control.
As can be seen in the "overview" in function diagram 788a, the basic
positioner consists of the three free function blocks that are completely
pre-wired together in the factory setting for the "Basic positioner with
motor encoder" function (these three blocks can also be used
individually for further applications).
All that therefore has to be done is to modify the desired inputs in
function diagram 788a (shown in more detail in function diagram 789a)
and connect the outputs (see function diagrams 788a and 789c) as
recommended (for motor encoder).
Enabling (ENABLE POS/ REF) is implemented in the factory setting
using the "position controller enabled" checkback signal, i.e. best way
to enable the basic positioner is by means of the user-selectable source
"enable position controller" (P210, [340.4]).
Function diagram 788 also provides a graphical overview of the
embedding.
As practically all the variables of the basic positioner (including those
between the three free function blocks) are binector or connector
inputs/outputs, the function can be controlled both using only one signal
or with the desired sequence/interlocking.
Consequently, the desired function/movement must be ensured by the
user.
6SE7087-6QX70 (Version AG)
Compendium Motion Control
05.2006
Siemens AG
SIMOVERT MASTERDRIVES