Emerson SI-Universal User Manual page 105

2x.031
Minimum
Default
Type
Display Format
Coding
P2 Device type (2x.038) : AB, FD, FR
Each position feedback device produces incremental signals which are counted in hardware. If P2
Marker Mode (2x.031) = 0 the following occurs when a marker event is produced by the Z1 input:
1. P2 Position (2x.029) and P2 Fine Position (2x.030) are reset to zero.
2. The bits in P2 Normalized Position (2x.058) related to P2 Position (2x.029) and P2 Fine
Position (2x.030) are reset to zero
3. P2 Marker Flag (2x.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 P2 Marker
Mode (2x.031) as described in the table below.
Bit
No action is taken unless the marker flag is zero before the marker event occurs. P2
0
Revolution/Pole Pitch Counter (2x.028)
P2 Revolution/Pole Pitch Counter (2x.028) and the whole of P2 Normalized Position
1
(2x.058) are also set to zero on a marker event
P2 Revolution/Pole Pitch Counter (2x.028) , P2 Position (2x.029) , P2 Fine Position
(2x.030) and the related part of P2 Normalized Position (2x.058) are not reset. (This
2
overrides bit 1.) P2 Normalized Position (2x.058) is transferred to P2 Normalized Marker
Position (2x.059) and P2 Marker Flag (2x.032) is set to one.
3 This bit has no effect.
The marker input can be used for a standard type marker function or alternatively it can be used as
an additional freeze input for the P1 position feedback interface.
P2 Device type (2x.038): Any other device type
The marker function cannot be used and P2 Marker Mode (2x.031) has no effect.
SI-Universal Encoder User Guide
Issue: 2
P2 Marker Mode
0
(Display: 0000)
4
(Display: 0100)
8 Bit User Save
Binary
RW
Effect of setting bit to one
15
Maximum
(Display: 1111)
Units
Update Rate Background read
Decimal Places 0
105