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14
DPF20 Frequency, rate, total or period counter
Instruction Manual
• ‘
Pulls on channel A’ (‘PuL.A’) - activates pull resistors at chan
-
nel A. Select ‘P.uP’ to activate pull-up resistors (needed for NPN
sensors). Select ‘P.dn’ to activate pull-down resistors (needed PNP
sensors). Pull-up and pull-down selection configure the trigger level
to 2,5 Vdc.
• ‘
Pulls on channel B’ (‘
PuL.b
’) - see previous menu entry ‘Pulls on
channel A’.
• ‘
Pulls on reset’ (‘PuL.r’) - see previous menu entry ‘Pulls on channel
A’. Trigger level for reset channel is fixed to 2,5 Vdc.
• ‘
trigger level’ (‘
trIG
’) - input signal value in Vdc at which the in
-
strument detects impulse. Selectable between 0,0 and 3,9 Vdc. Trig
-
ger level is the same for channels A and B. Trigger level for reset
channel is fixed at 2,5 Vdc. The two leds at the left of the trigger
level are part of the ‘Trigger Sense’ utility for easy location of the
proper trigger level
(see section 1.13)
.
• ‘
Activation for channel A
’ (‘Act.A’) - configures the activation of
channel A by rising edge (‘on_h’) or by falling edge (‘on_0’)
• ‘
Activation for reset channel
’ (‘Act.r’) - configures the activa
-
tion of the reset channel by rising edge (‘on_h’) or by falling edge
(‘on_0’)
• ‘
Excitation voltage
’ (‘
V.EXc
’) - configures the value of the excita
-
tion voltage at 5 Vdc, 9 Vdc, 15 Vdc and 18 Vdc. Select ‘no’ to disable
the excitation voltage.
• ‘
Antirrebound filter
’ (‘
rbnd
’) - the antirrebound filter blocks ad
-
ditional rebounds (typically from a mechanical contact sensor) from
the same single impulse, preventing that a single impulse counts
for more than 1. Value between 0 mSeconds and 1000 mSeconds.
When an impulse is received, impulse detection is disabled for the
duration of the time configured in this parameter. After time has
passed, impulse detection is enabled again. Recommended value
for a mechanical contact : 100 mSeconds.
1.19 Configuration menu (cont.)
Antirrebound
by rising edge
by falling edge
Activation for
channel A
by rising edge
by falling edge
Activation for
reset
Excitation voltage
Trigger level
Trigger level (from
0.0 Vdc a 3.9 Vdc).
See section 1.15
for ‘Trigger Sense’
utility
Antirrebound filter
(0 to 1000 mSec.)
Pull-down
No pull resistor
Pull-up
Pulls on reset
Pulls on channel B
Pull-down
No pull resistor
Pull-up
Pull-down
No pull resistor
Pull-up
Pulls on channel A