Digital Pulse - Define Instruments G3 IoT Manual

Note 6 Do not run input cables in close vicinity to noisy power supplies, contactors or motor cables.
The best practice is to run input cables on a separate earthed cable tray. This will minimize RFI ef-
fects, of which magnitude cannot be easily predicted.

8.5 - Digital Pulse

(Alternate operating mode of analog universal inputs)
Frequency range 0–2500.0Hz
Fast counter range 0–2500.0Hz
Sensors Open collector (NPN, PNP), TTL
or Clean Contact
This unit's universal input terminals accept
digital inputs from NPN, PNP or TTL sensors
as well as Clean Contacts. Pulses up to 2.5kHz
can be counted (except for the debounced
counter, which has a range of 0–50Hz).
A variety of operating modes are software
programmable to suit your application.
NPN Open
Collector
Output
© 2024 Define Instruments
PNP Open
Collector
Output
G3 IoT Manual | Doc No: 2303-00000-0-1 | Rev: 24V05 | 19 Mar, 2024
Frequency resolution 0.1Hz
Debounce counter range 0–50Hz max
Counter register output 32 bit
Accuracy ±0.5%
Software programmable modes include:
• General counter
• General debounced counter (ideal for
mechanical relay contacts which are
subject to bouncing)
• General frequency
• Flow count (uses K-factor)
• Flow rate (uses K-factor)
• RPM (uses pulses per revolution)
Reed Switch or
TTL Input
Relay Contact
49