GSE 60 SERIES Technical Reference Manual page 474

12-28 Chapter 12
GSE Scale Systems
change in encoder value may be divided by the change in time to
determine directional speed.
I O
NDEX PERATION
When the index pulse occurs, the value of the encoder, P50, is copied to
the Index value, P51. P52 is calculated by the 660 as P50 - P51. It is
calculated so that it has the same maximum and minimum values as P50,
specifically +32,767 and -32,768. This capability can be used to determine
a home or zero reference position for a positioning device.
See Figure 12-6 included with the 'QdDc2' description for clarification of
the encoder signals.
PDIO S
AMPLED
The frequency debounce function is typically used to eliminate unwanted
high frequency "noise" such as that caused by the contact closure of a
mechanical switch. Since the PDIO port can detect very high frequencies,
this "noise" can result in additional false pulse counts. The frequency
debounce acts as a high frequency filter in which you can set the
maximum expected frequency and ignore any pulses that exceed that
frequency.
•
P852: "Fnam": Allows a name to be assigned to I/O parameter 50
which is used to report the pulse frequency determined by this
function.
•
P853: "Pnam": Allows a name to be assigned to I/O parameter 51
which is used to report the pulse count determined by this function.
•
P854: "AvFN": Allows a name to be assigned to I/O parameter 52
which is used to report the average pulse frequency determined by
this function.
•
P856: "MaxF": Used to specify the maximum expected frequency (48
to 10752 Hz).
•
P859: "Perd": Used to specify the frequency measurement period in
milliseconds.
•
P863: "Sfac": Used to specify a variable to be used as a scaling
(multiplication) factor for reporting received pulses. For example, a
scaling factor of 0.1 would multiply the received pulses by 0.1 and thus
report one count for every 10 pulses received.
•
P864: "# DP": Used to specify the number of decimal places when
reporting the received pulses.
There are three (3) weigh mode parameters used to report frequency
debounce data:
•
P50.X Frequency
F (F
REQUENCY
10)
UNCTION