MPH-02, MPB-02, MPD-02
Extended Drive Functions
9-21
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
•
internal digital position values
•
internal position command value (P-0-0434)
•
resulting master axis position (P-0-0775)
→
requires the functional package "synchronization"!
•
effective master axis position (P-0-0776)
→
requires the functional package "synchronization"!
The emulation signal is determined by entering the desired IDN from the
list parameter P-0-0900 in parameter
P-0-0901, Encoder emulation
signal selection
.
Note:
The resolution of the emulated signal is determined for both
kinds of emulation (SSI and IGS) in parameter
P-0-0903,
Encoder emulation resolution
.
Incremental Encoder Emulation
The incremental encoder emulation provides a square-wave signal in TTL
level with variable frequency. The position difference of the selected
signal in the last position loop cycle (Basic: TA = 500µs, Advanced:
TA = 250µs) is calculated. The number of lines to be output and therefore
the periodic time of the square-wave signal for the next output interval is
calculated depending on the input in parameter
P-0-0903, Encoder
emulation resolution
.
Incremental Encoder Signals in TTL Format
By outputting two signals offset by 90 degrees (track A and track B) the
resolution is increased by the factor 4 when the two tracks are evaluated
in differential form. One line is then corresponding to 4 increments.
In addition, the incremental encoder outputs a third signal, the zero pulse.
The zero pulse has a fixed reference to the emulated signal (e.g. of the
encoder shaft, if an encoder signal is emulated) and can, in case position
data reference is existing (axis homed), also be emulated with reference
to the machine zero point.
Note:
If bit 7 was set in
P-0-0902, Encoder emulation control
parameter
, it is only when the drive has been homed (cf.
S-0-0403) that the zero pulse is output in the distance of the
lines entered in
P-0-0905, Encoder emulation zero pulse
distance
. The generated zero pulses are then referring to the
actual machine zero point.
Selecting the Emulation Signal
Tracks A and B
Zero Pulse
Courtesy
of
CMA/Flodyne/Hydradyne
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Motion
Control
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426-5480
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