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6 Description of the Functions
6.2
Positioning mode (P0700 = 3, from SW 2.1)
MDI positioning
block
MDI and external
block change
MDI block
influence
6-428
The MDI block is a positioning block which can contain the following
data:
Position
Velocity
Acceleration override
Deceleration override
Mode
The block parameters entered using PZDs via PROFIBUS–DP, are cy-
clically transferred. The block parameters which do not exist here, are
supplemented by the data from the default block (P0091 to P0094,
P0097). The parameters, valid up to when the traversing task is acti-
vated or the external block change, are then transferred into the inter-
polator and executed. This means, for example, that it may be suffi-
cient to just enter the position reference value using PZD and to use
the remaining data (velocity, acceleration override, etc.) from the de-
fault block.
If CONTINUE EXTERNAL block change enable is parameterized in the
MDI block then the transfer of the "possibly modified" block parameter
into the running or "waiting" MDI block is triggered using the "external
block change" signal. P0110 defines when the values become effective
i.e. when they are transferred into the interpolator:
S
P0110 = 2
The system only waits for the signal at the end of the block; when
the signal is detected, a block change is executed.
S
P0110 = 3
If the signal is not present up to the end of the block, then the axis
waits for the signal and when this is detected, a block change is
made. (from SW 5.1).
For the MDI function, only the configuration P0110 = 2 or 3 is per-
mitted.
Note
If the deceleration was changed during the braking ramp with absolute
positioning, then this is not accepted. Positioning is realized with the
previously set braking ramp (P0084 or P0094).
The input signal "reject traversing task" deletes the programmed MDI
block.
The input signal "intermediate stop" holds the MDI block.
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
input MSR
input c S MSR/min
percentage of P0103
percentage of P0104
ID
x0x = ABSOLUTE
x1x = RELATIVE
x2x = ABS_POS
x3x = ABS_NEG
0xx = END
3xx = CONTINUE EXTERNAL
E Siemens AG 2005 All Rights Reserved
07.03
01.99
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