5.4 Input:
inPut
The Input function contains two sub-functions
inP
.
tYPE
and
dEbounCE
that define the type of input
and the amount of input noise rejection.
5.5 Input type:
inP.
tYPE
inP
.
tYPE
is a sub-menu in the
inPut
function which
defines the type of input sensor or input pulse that
the instrument will count. To check or change the
type of input, select
inPut
in the configuration menu
and press
(
which will reveal the
inP.
tYPE
prompt,
pressing
(
again will show the existing Input
setting
.
If set as required press
)
twice to return to
the configuration menu, or repeatedly press the
&
or
*
button until the required type of input is
displayed and then press
)
twice to return to the
configuration menu.
One of following six types of input may be selected:
Switching
thresholds
Low High
oP
.
CoL
Open collector
2
2
10k
Ω
VoLt5 L
Voltage pulse low
1
1
3V
VoLt5 H
Voltage pulse high
1
3
10V
CoiL
Magnetic pick-off
0
40mV
Pr
.
dEt
Proximity detector
2
1.2
2.1mA
ContACt
Switch contact
2
100
1000
Ω
Notes:
1. Maximum voltage input +30V.
2. For sensors connected to the input that
require energising i.e. proximity detectors,
switch contacts or open collector sensors,
terminals 3 & 4 of the BA567E-SS should be
linked together.
3. To count correctly, the input pulse must fall
below the lower switching threshold and rise
above the higher switching threshold.
4. See section 5.6 for maximum counting
frequency.
5.6 Input debounce:
dEbouncE
dEbouncE
is an adjustable sub-menu in the
inPut
function which prevents the input miscounting when
the input pulse has noisy edges, such as those
resulting from a mechanical contact closing and
bouncing.
Three levels of protection may be selected. The
amount of debounce applied depends upon the type
of Counter input that has been selected in the
inP
.
tYPE
function.
Select
inPut
in the configuration menu and press
(
which will reveal the
inP
.
tYPE
prompt, press the
&
or
*
button to select
dEbouncE
followed by
(
to reveal the existing setting. Pressing the
&
or
*
button will scroll through the three levels. When the
required level has been selected, pressing
)
twice
will enter the selection and return the display to the
configuration menu.
The following table shows the minimum time that the
input pulse must be continuously above the upper
input switching threshold and continuously below the
lower switching threshold to ensure that the Counter
processes the input pulse. Input switching
thresholds are shown in section 5.5.
debounce
level
Min input pulse width
Type of Input
Contact
All others
Default
1600µs
40µs
Heavy
3200µs
350µs
Light
400µs
5µs
The maximum counting frequency of the
BA567E-SS depends upon the debounce level
selected, the shape of the input pulse and its
amplitude. The following table assumes a square
wave input and is included for guidance. The
maximum counting frequency will be lower if the
input pulses have sloping edges and the pulse
amplitude only slightly exceeds the input switching
thresholds.
ONLY FOR GUIDANCE
debounce
level
Max counting frequency
Type of input
Contact
All others
Default
250Hz
12kHz
Heavy
120Hz
2kHz
Light
1000Hz
100kHz
The minimum counting frequency is 0.01Hz. Below
this frequency the rate display is forced to zero.
14
Summary of Contents for BA567E-SS
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