Emerson SI-Universal User Manual page 94

2: Rising All
Freeze events are produced on the rising edge of the freeze trigger source. If the F1 Freeze Flag
(1x.104) is 0 then the first suitable edge produced by the trigger source causes the freeze position
to be stored and the F1 Freeze Flag (1x.104) to be set to 1. If further suitable edges are produced
by the trigger source the freeze position is updated with the current position.
3: Falling All
As for Rising All but the falling edge is used to trigger freeze events.
Please refer to Figure 7-3 P1 Freeze System on page 52 for further information.
1x.102
Minimum
Default
Type
Display Format
Coding
Value
0
1
F1 Freeze Position Source (1x.102) define the source position for the F1 freeze system. When a
freeze event occurs, the position from the relevant position feedback interface including the effect
of the marker (see P1 Marker Mode (1x.031) is stored and can be accessed as a 32 bit normalized
value in F1 Normalized Freeze Position (1x.103).
The freeze position is calculated as follows:
Digital incremental source: the position is captured in hardware and the normalized freeze position
and freeze flag are updated by the drive within 250 µs (the flag is always updated after the position
is updated).
All other devices: The freeze position is the position at the 250 µs sample point modified with time
based interpolation based on the position change over the previous 250 µs period.
1x.103
Minimum
Default
Type
Display Format
Coding
See F1 Freeze Position Source (1x.102)
94
F1 Freeze Position Source
0
0
8 Bit User Save
None
RW, Txt
Text
P1
P2
F1 Normalized Freeze Position
-2147483648
32 Bit Volatile
None
RO, ND, NC, PT
Maximum
Units
Update Rate
Decimal Places
Maximum
Units
Update Rate
Decimal Places
SI-Universal Encoder User Guide
1
Background read
0
2147483647
250 µs write
0
Issue: 2