Emerson SI-Universal User Manual page 57

1x.029
Minimum
Default
Type
Display Format
Coding
See P1 Revolution/Pole Pitch Counter (1x.028).
1x.030
Minimum
Default
Type
Display Format
Coding
See P1 Revolution/Pole Pitch Counter (1x.028).
1x.031
Minimum
Default
Type
Display Format
Coding
P1 Device Type (1x.038) : AB, FD, FR, AB Servo, FD Servo, FR Servo
Each position feedback device produces incremental signals which are counted in hardware. If P1
Marker Mode (1x.031) = 0 the following occurs when a marker event is produced by the Z1 input:
1. P1 Position (1x.029) and P1 Fine Position (1x.030) are reset to zero.
2. The bits in P1 Normalized Position (1x.058) related to P1 Position (1x.029) and P1 Fine
Position (1x.030) are reset to zero
3. P1 Marker Flag (1x.032) is set to one.
The marker is a hardware function, and so the position appears as though it is reset at the marker
event time even if this is between control system sample points. It should be noted that the marker
event occurs on the rising edge of the marker pulse if the position change over the last sample was
positive or on the falling edge if the position change over the last sample was negative. This
ensures that the marker event occurs at the same physical location for either direction of rotation.
The action taken when a marker event occurs can be modified by setting the bits of P1 Marker
Mode (1x.031) as described in the table below.
SI-Universal Encoder User Guide
Issue: 2
P1 Position
0
16 Bit Volatile
None
RO, ND, NC, PT, BU
P1 Fine Position
0
16 Bit Volatile
None
RO, ND, NC, PT, BU
P1 Marker Mode
0
(Display: 0000)
4
(Display: 0100)
8 Bit User Save
Binary
RW
Maximum 65535
Units
Update Rate 4 ms write
Decimal Places 0
Maximum 65535
Units
Update Rate 4 ms write
Decimal Places 0
15
Maximum
(Display: 1111)
Units
Update Rate Background read
Decimal Places 0
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