Emerson SI-Universal User Manual page 58

Bit
0 No action is taken unless the marker flag is zero before the marker event occurs.
P1 Revolution/Pole Pitch Counter (1x.028) and the whole of P1 Normalized Position
1
(1x.058) are also set to zero on a marker event.
P1 Revolution/Pole Pitch Counter (1x.028) , P1 Position (1x.029) , P1 Fine Position
2 (1x.030) and the related part of P1 Normalized Position (1x.058) is transferred to P1
Normalized Marker Position (1x.059) and P1 Marker Flag (1x.032) is set to one.
If this bit is 0 the state of the marker is only undefined when the differential input is in
the range from -200 mV to 200 mV. The marker pulse is only guaranteed to be
recognized if it is at least 500 ns wide. This setting is used for most encoders with
standard level marker pulses.
If this bit is set to 1 the undefined state region is reduced to the range from -30 mV to
3
30 mV. The marker pulse is only guaranteed to be recognized if it is at least 10 µs
wide. The smaller undefined region is required for position feedback devices that
produce a small marker pulse, such as the Heidenhain ERN1387 encoder. Note that
the reduced undefined region is only provided for position feedback interface P1 and
that this bit in P2 Marker Mode (2x.031) 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.
P1 Device Type (1x.038) : SC, SC Servo
The marker function operates in the same way as for the digital incremental encoders. The
resolution of the marker actions is only as accurate as the zero crossings of the sine waves.
P1 Device Type (1x.038) : Any other device type
The marker function cannot be used and P1 Marker Mode (1x.031) has no effect.
1x.032
Minimum
Default
Type
Display Format
Coding
P1 Marker Flag (1x.032) is set to one when a marker event occurs. The flag must be cleared by the
user.
58
Effect of setting bit to one
P1 Marker Flag
0
0
1 Bit Volatile
None
RW, NC
Maximum
Units
Update Rate
Decimal Places
SI-Universal Encoder User Guide
1
250 s write
µ
0
Issue: 2