6
6.2
Positioning mode (P0700 = 3, from SW 2.1)
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Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
There is only one MDI block.
The reference point must be approached or set, also for incremental
MDI blocks.
The MDI block can be entered via PROFIBUS–DP or the default
block (P0091 to P0094, P0097). A combination is also possible.
This means, for example, the position is entered via PROFIBUS and
the remaining block parameters are taken from the default block.
The interpolator requires 2 IPO clock cycles for a block change.
If the transfer of modified block parameters is initiated using the ”ex-
ternal block change” signal while the MDI block is interrupted with
an intermediate stop – then after the intermediate stop is withdrawn,
the modified block is executed.
For MDI blocks where the programmed position can no longer be
reached in the specified direction of rotation, initially the axis is
braked down to standstill and is then moved to the target position in
the opposite direction.
If relative positioning (incremental dimension) is parameterized for
an MDI block, then for a CONTINUE EXTERNAL block change
enable positioning is re–started from the current actual position with
”external block change”.
The clock cycles (current controller, speed controller, positioning
controller and interpolation clock cycle) are, for ”SIMODRIVE 611
universal” set as standard and must be increased for a double–axis
module for two–axis operation (P1000, P1001, P1009, P1010).
If, for an MDI block, the deceleration override (STW MDIDec or
P0094) is reduced too much, then fault 131 is output. However, for
absolute positioning, this only applies if the braking ramp has still
not started.
If, for an MDI block, a block change is initiated, and the new target
position does not differ from the previous target position, then the
”reference position reached” output signal is not reset.
The following parameters are available for the ”MDI” function:
P0091
MDI position
P0092
MDI velocity
P0093
MDI acceleration override
P0094
MDI deceleration override
P0097
MDI mode
P0110
Configuration, external block change
P0655
Image, input signals, Part 3
P0657
Image, output signals, Part 2
P0915:17
PZD setpoint assignment, PROFIBUS
P0916:17
PZD actual value assignment, PROFIBUS
P0922
Telegram selection PROFIBUS
Limitations/second
ary conditions
Parameter
overview
(refer to Chapter
A.1)
6 Description of the Functions
01.99
07.03