Emerson SI-Universal User Manual page 113

2x.043
Minimum
Default
Type
Display Format
Coding
The speed feedback from the P2 position feedback interface can be used as a source to control a
parameter.
The speed feedback is scaled to give a value as a percentage of P2 Maximum Reference (2x.043)
in 0.1% units which is displayed in P2 Reference (2x.043).
The value is then scaled by P2 Reference Scaling (2x.044), and then routed to the destination
defined by P2 Reference Destination (2x.046).
Normally the destination is updated every 4 ms, but if the destination is the Hard Speed Reference
(03.022) on the drive, P2 Maximum Reference (2x.043) = VM_SPEED_FREQ_REF[MAX] and P2
Reference Scaling (2x.044) = 1.000 it is updated every 250 μs. Although the hard speed reference
is updated every 250 μs internally, a value in rpm or mm/s is written to the Hard Speed Reference
(03.022) every 4 ms for indication only.
The value transferred to the hard speed reference is written in internal speed units as a change of
32
position in 1/2 revolution units over a time period of 250 μs giving a speed resolution of 55.9 x 10
6
rpm.
2x.044
Minimum
Default
Type
Display Format
Coding
See P2 Maximum Reference (2x.043).
2x.045
Minimum
Default
Type
Display Format
Coding
See P2 Maximum Reference (2x.043).
2x.046
Minimum
Default
Type
Display Format
Coding
See P2 Maximum Reference (2x.043).
SI-Universal Encoder User Guide
Issue: 2
P2 Maximum Reference
0
3000
16 Bit User Save
None
RW, BU
P2 Reference Scaling
0.000
1.000
16 Bit User Save
None
RW
P2 Reference
-100.0
16 Bit Volatile
None
RO, FI, ND, NC, PT
P2 Reference Destination
0.000
0.000
16 Bit User Save
None
RW, DE, PT, BU
Maximum 50000
Units
Update Rate Background read
Decimal Places 0
Maximum 4.000
Units
Update Rate Background read
Decimal Places 3
Maximum 100.0
Units %
Update Rate 4 ms write
Decimal Places 1
Maximum 59.999
Units
Update Rate Drive Reset Read
Decimal Places 3
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