ZEN-LOG-MAN-16V03 (0930)
Copyright © 2016 Define Instruments
31
Connection Example for
Digital Pulse Inputs
NPN
Open
Collector
Reed Switch
or
Relay
Contact
PNP
Open
Collector
TTL
Input
(0-5V max)
5V
0
Input
Channel
A+
B–
Input
Channel
A+
B–
Input
Channel
A+
B–
Input
Channel
A+
B–
Note 1
All digital inputs are isolated from
each other. Inputs from various sources
can be connected without fear of crat-
ing unwanted and troublesome ground
loops.
Note 2
Software selectable functions
include: frequency to 2kHz, debounced
counter for contact closures to 100Hz
maximum, fast counter to 20KHz.
Note 3
All cables must be screened, with
screen earthed at one end only.
Note 4
Do not run input cables in close
vicinity to noisy power supplies, contac-
tors or motor cables. The best practice is
to run input cables on a separate earthed
cable tray. This will minimise RFI effects,
of which magnitude cannot be easily
predicted.
7.6 - Potentiometer input
Potentiometer input
3-wire
Excitation voltage
Variable
Potentiometer resistance
<2kΩ low pot;
>2kΩ high pot
Field prog zero
0–90% of span
Field prog span
0.1–100%
Linearity and repeatability
<±0.05% FSO typical
Response time
100msec
Temperature drift
<50ppm/°C
A 3 wire potentiometer is typically used to measure position. A low or
high potentiometer range can be programmed to your unit using the
WorkBench software.
These ranges must be calibrated using the two point calibration method.
Potentiometer
