Siemens SIMOVERT MASTERDRIVES Manual page 719

05.2006
Select MDI block
[823.3]
Numeric
representation of G
functions
Siemens AG 6SE7087-6QX70 (Version AG)
SIMOVERT MASTERDRIVES
The second G function defines the acceleration override", that is a
reducing factor, which can be set in steps of 10 %, for the
acceleration/deceleration of the traversing ramps defined in MD18
and MD19. The second G function can accept the following 10
values:
• 30 →
acceleration = MD18,
deceleration = MD19 (normal setting)
• 31 → acceleration = 10 % of MD18,
deceleration = 10 % of MD19
• 32 →
acceleration = 20 % of MD18,
deceleration = 20 % of MD19
• 33 →
acceleration = 30 % of MD18,
deceleration = 30 % of MD19
...
• 39 →
acceleration = 90 % of MD18,
deceleration = 90 % of MD19
• Position in [LU] units, i.e. length unit defined by the actual value
weighting factor (AVWF)
• Traversing velocity in [10 LU/min] units; e.g. AVWF sets
1 LU = 1 µm, desired velocity = 1000 mm/s ==> input value =
6 000 000
Further below you will find two practical examples of MDI blocks.
11 MDI blocks are available, of which one can be selected with the 4
control bits [MDI_NO] using the large selectors [823.3 and 809.4] at the
top border of [823]. MDI block 0 can have any 3 connectors as a
source. These can be selected with parameters U531, U532 and U533
(the G functions use a "single connector" as the source, the position
and velocity use a double-connector). The remaining 10 MDI blocks,
numbers 1 to 10, are stored in the non-volatile triple-index parameters
U550...U559.
MDI block 0 can be transmitted to the MASTERDRIVES via a field bus
(PROFIBUS-DP, USS etc.). MDI blocks 1...10 can be selected using
the digital inputs of the converter terminal strip.
The G functions are represented in hexadecimal format in the
connector selected by U531 (MDI block "0") and in decimal format in
non-volatile parameters U550.1...U559.1 (MDI blocks 1...10).
Example: Absolute positioning with 100 % acceleration override: value
of connector = 5A1E (hex), value setting of fixed parameter 90 30
(decimal). 9030 is also the factory setting for the permanent G
functions.
The representation of the position and velocity is identical in the double-
connectors and parameters.
Compendium Motion Control
Technology Option F01
9-71