22
2.1 DESCRIPTION
When programmed as a counter the BA364D will
accept pulses on one or both inputs and may be
programmed to display:
Input A + Input B
Input A
-
Input B
Input A direction controlled by Input B
Quadrature input
(Input A and Input B electrically 90
o
apart)
The separate six digit display may be activated to
show the input pulse rate in engineering units per
second, minute or per hour.
In addition to simple counting applications, the
quadrature input allows direction of movement
and position to be displayed. This may be
achieved using two individual transducers
positioned to produce the quadrature waveforms
shown in section 2.5.4, or a proprietary
transducer with two outputs may be used.
The total display may be reset from the
instruments internal push-buttons, the optional
external push-buttons, or by closure of a remote
contact. The instrument also maintains a grand
total which can only be reset from within the
programme menu.
An optional 4/20mA output current sink may be
programmed to produce a linear output
proportional to any positive part of the displayed
total or displayed rate. For applications where
the instrument is counting pulses on one or both
inputs (Input A + Input B) an optional
retransmitted pulse output is also available.
Two optional alarm outputs may be programmed
to operate on positive total or rate displays
allowing simple batching applications to be
performed.
2.1.1 Initialisation and loss of power
When power is applied to a BA364D counter,
following initialisation the instrument will start
functioning using the programmed parameters
stored in permanent memory. If during operation
the power supply is interrupted, all programme
parameters, the displayed total and the grand
total will be stored in permanent memory.
2.1.2 Controls
The BA364D counter is controlled and calibrated
via four push-button switches which are located
behind the instrument control cover, or as an
option on the outside of the instrument control
cover – see 1.9.4. In the display mode i.e. when
the instrument is counting the switch functions
are:
Description of Switch Functions
E+Down
While these buttons are pushed the
total display will show the eight digit
grand total and the grand total
annunciator will be activated.
Down+Up
Resets the total display to zero or to
the reset value when these two
push-buttons are operated
simultaneously for more than two
seconds. Selectable function from
programme menu. See section
2.5.14
P+Down
While these buttons are pushed the
instrument will display the firmware
and version numbers plus the
programmed function.
Note
: When optional alarms are fitted, the
BA364D may be programmed to provide direct
access to the alarm setpoints from the display
mode by operating the
P + Up
push-buttons.
See section 2.6.10
2.1.3 Displays
The BA364D counter has two digital displays and
associated annunciators.
Total
Shows total count since last
display
reset on larger display which
has a range of -9999999 to
99999999.
Rate
Shows rate on smaller lower
display
display which has a range of
–99999 to 999999.
May be turned off – see 2.5.7
Reset
Activated while total display is
Annunciator
being reset.
Grand total
Activated while grand total is
Annunciator
being displayed.
Alarm
Activated when optional alarm
Annunciators
is activated.
