Siemens SIMODRIVE 611 universal Function Manual page 427

01.99 02.03
The data available in the block parameters (PZD and/or default block)
at instant in time TA is transferred into the interpolator and processed.
This data (MDI A) remains valid up to instant in time TB when new data
is transferred into the interpolator. In turn, these (MDI B) remain valid
until new data is transferred (TC/MDI C).
Note
The following applies for the MDI mode:
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SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
6.2 Positioning mode (P0700 = 3, from SW 2.1)
MDI is switched–in using the "activate MDI" signal via terminal
(Fct.–No. 83) or PROFIBUS (SatzAnw.15). The "MDI active" signal
is used for the feedback signal which is either transferred via
terminal (Fct. No. 83) or PROFIBUS (AktSatz.15). A traversing
block can be entered using process data (MDIPos, MDIVel,
MDIAcc, MDIDec, MDIMode) via PROFIBUS–DP and started using
the signal "activate traversing task".
If either no MDI block or only individual block parameters are
entered via PROFIBUS–DP, then the missing parameters are taken
from the MDI default block (P0091 to P0094, P0097). However, if
MDI process data are parameterized in P0915:17 and these are
also transferred via PROFIBUS–DP, then the values in parameters
P0091 to P0094 and P0097 are not taken into account.
If CONTINUE EXTERNAL is parameterized as block change
enable, then actual block parameters of the MDI block (entered via
PZDs and/or MDI default block) are immediately transferred into
the interpolator with the signal "external block change".
For an MDI block, the block change enable signals CONTINUE
WITH STOP and CONTINUE FLYING, are not possible. The block
change enable CONTINUE EXTERNAL is only permissible with
P0110=2 or 3 (configuration of an external block change).
If the signal "Activate MDI" is set to 0 while an MDI block is still
running, then fault 144 is initiated. This means that MDI operation
can only be disabled after the target position has been reached.
The signals "operating condition/reject traversing task" and
"operating condition/intermediate stop" are effective just the same
as in the normal "positioning" operating mode.
The monitoring functions, e.g. software and hardware switches are
also active.
6 Description of the Functions
6-427
6