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Zen RTU
Remote Terminal Unit
Get 16 signals into your PLC or
SCADA system
If you need to collate multiple signal
input types and route them to your
PLC or SCADA system, choose the Zen
RTU. This exceptionally exible and
powerful monitoring and control
station is the last word in RTU technology.
Perfect for SCADAs and PLCs, as
well as Logix Controllers and FactoryTalk View
The Zen RTU is ideal for applications which require collation of multiple signals
routed directly to a master console for connecting straight to SCADA systems and PLCs.
It has four digital inputs and an RS485 Modbus/RTU port. Additionally, it has an Ethernet port that can
be selected as Modbus TCP for connection to Logix Controllers, FactoryTalk View etc.
The Zen RTU is available with either isolated or non-isolated inputs, with the nonisolated option oering a low-cost solution for RTD applications:
Zen RTU/U
Universal Isolated Inputs
Enjoy the exibility of universal inputs
The Zen RTU/U accepts TC, RTD, mA, mV, V, Frequency and Counter. This means you can reduce
the number of separate instruments you need for
your application, keeping things simple for maintenance and troubleshooting.
Zen RTU/R
RTD Non-isolated Inputs
Why pay more for channel isolation
you don't need?
The Zen RTU/R is designed specically for applications with temperature signals. It has non-isolated
inputs specically for PT100 / PT1000 RTD signals.
Cleans up noise
Each of the Zen RTU/U channels is isolated so
there’s zero cross-talk.
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No calibration!
Simple setup in just minutes with WorkBench.
With a range of smart features to simplify setup of your input channels, digital inputs and totalizers, as
well as presets for easy scaling (with no calibration required!), WorkBench oers an intuitive and simple
setup experience for your Zen RTU.
Dynamic Help Panel
The dynamic help sidebar tracks your setup progress and unobtrusively presents wiring diagrams, explanations, and examples of use.
Feature Packed
Simulation Mode enables simulated conguration of any Zen product without a physical connection ideal for product demos and o site support. WorkBench also has the ability to Import/Export Congu-
ration Settings, and generate a PDF
Conguration Certicate - perfect
for dispatch with a pre-congured
product.
Ordering Codes for Zen RTU
ZEN-RTU/U
ZEN-RTU/R
Power Supply:
-HV 85–265V AC / 95–370V DC
-MV 24–48V AC / 17–72V DC
Port 1:
-EMOD Ethernet Modbus
16x Universal Isolated Inputs, 4 digital inputs
2 comm ports (Port 1= Selectable, Port 2= RS485 / RS232)
16x RTD Non-isolated Inputs, 4 digital inputs
2 comm ports (Port 1= Selectable, Port 2= RS485 / RS232)
No Port 1
Bridge Key Compatible
The Zen RTU utilizes our universal
Bridge Key for PC connection, so
if you've already purchased a USB
programmable Dene Instruments
product, your USB programmer will
work for both.
Accessories (Sold Separately)
BRIDGE-KEY USB Bridge Key, required for PC programming using our free WorkBench soware.
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General specications
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Power
Power supply
HV= 85–265V AC / 95–370V DC, OR
MV= 24–48V AC / 17–72V DC
Supply frequency 50/60Hz, 10VA
Mains isolation 250V AC
Mains isolation test voltage to all
inputs and outputs 3000V AC 50Hz
for 1min
General specications
Linearity & repeatability <±0.1% FSO
Channel separation 125db minimum
RF immunity <±1% eect FSO typical
Noise immunity (CMRR) 160dB
tested at 300V RMS 50Hz
Permanent memory (EROM)
100,000 writes per input parameter
Threshold 4.6V typical
Debounce counter range 0–100Hz
Load At 5V DC: 1.1mA; At 24V DC:
7mA
Isolation test voltage 1000V DC for
1min (Digital input to analog input)
Comms
Protocols Modbus RTU, RS232 or
RS485
Port 1 Select one of the following:
No Port 1 Comm OR
EMOD= Ethernet Modbus (10/100/
Auto)
Port 2 RS232 / RS485 auto-select
Selectable baud rate 2400–230000
baud. Format 8 bit, no parity, 1 stop
Isolation test voltage 1000V DC for
1min between comms and analog/
digital input
Analog input ZEN-RTU/U
16x Isolated Universal Inputs
See overleaf for input type
specications
Input isolation 2,500V AC 1 minute
between all input channels
Isolation test voltage 1000V DC for
1min (Analog input to analog input)
Input resolution 16 bits
Accurate to <±0.1% FSO (unless other-
wise stated for individual input type)
Analog input ZEN-RTU/R
16x Non-Isolated RTD Inputs
See overleaf for specications
Input isolation Not isolated
Input resolution 16 bits
Digital input
Programming
USB programmable Via USB prog
port using Bridge Key USB programmer (sold separately)
Simple conguration using Dene
WorkBench:
deneinstruments.com/workbench
Construction
Casing DIN 35 rail mounting; Material: ABS inammability V0 (UL94)
Dimensions (H x W x D, with plugs)
2.32 x 10.04 x 5.67"
(59 x 255 x 144mm)
Environmental conditions
Operating temperature 14 to 140°F
(–10 to 60°C)
Storage temperature –4 to 176°F
(–20 to 80°C)
4 x Opto isolated inputs with LED
indication of each input
Functions Status, up counter, up/
down counter with direction,
debounced counter, frequency,
gated frequency
Counter register output 32 bit
Frequency range 0–10,000Hz
Input voltage 5–30V DC
Operating humidity 5–85% RH max,
non-condensing
Compliances
EN-61326-1:2006
EMC Emissions EN 558022-A;
Immunity EN 50082-1; Safety EN
60950
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RTD input - Zen RTU/U & Zen RTU/R
RTD input type
Pt100 3 wire RTD DIN 43760: 1980
Pt1000 3 wire RTD standard
Range -328 to 572°F (-200 to 300°C),
0.02°F (0.01°C) resolution;
-328 to 1472°F (-200 to 800°C), 0.1°F
(0.1°C) resolution
Lead wire resistance 10Ω/lead max
recommended
Sensor current 0.6mA continuous
Sensor fail Upscale
Ambient dri 0.003°C/ typical
Other input types - Zen RTU/U only
Thermocouple Input
Thermocouple types
B= 32 to 3272°F (0 to 1800°C)
E= -328 to 1292°F (-200 to 700°C)
J= -328 to 1832°F (-200 to 1000°C)
K= -328 to 2300°F (-200 to 1260°C)
N= -328 to 2372°F (-200 to 1300°C)
R= 32 to 3092°F (0 to 1700°C)
S= 32 to 3092°F (0 to 1700°C)
T= -328 to 752°F (-200 to 400°C)
Input impedance >500KΩ
T/C lead resistance 100Ω max
Cold junction compensation
14 to 140°F (–10 to 60°C)
CJC dri <0.02°C/°C typical for all
inputs
Accuracy 0.1% of FSO ±1°C typical
Sensor open Upscale
Current Input
Range 0–20mA, 4–20mA
Input impedance 45Ω
Max over-range Protected by PTC to
24V DC
Linearity & repeatability 0.1% FSO
max
Accuracy 0.1% FSO max
Channel separation 0.001% max
Ambient dri 0.003%/°C FSO typical
RF immunity 1% eect FSO typical
Fail safe micro switch Prevents exter-
nal loops from being interrupted in
the event of a power loss to the Zen
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Voltage Input
Ranges ±200mV, –200mV to 1V,
0–10V, 0–18V
Input impedance >500KΩ (all ranges)
Maximum over voltage 24V DC
Linearity & repeatability 0.1% FSO
max
Accuracy 0.1% FSO max
Channel separation 0.001% max
Ambient dri 0.003%/°C FSO typical
RF immunity 1% eect FSO typical
Digital Pulse Input
Frequency range 0–2500.0Hz
Fast counter range 0–2500.0Hz
Sensors Open collector (NPN, PNP),
TTL or Clean Contact
Frequency resolution 0.1Hz
Debounce counter range 0–50Hz max
Counter register output 32 bit
Accuracy ±0.5%
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%
Response time 100msec
Accuracy (RTU/R)
-328–572°F (-200–300°C) = ±0.2°C
-328–1472°F (-200–800°C) = ±0.3°C
Accuracy (RTU/U)
-328–572°F (-200–300°C) = ±0.1°C
-328–1472°F (-200–800°C) = ±0.3°C
Linearity & repeatability <±0.05%
FSO typical
Ambient dri <50ppm/°C
AC Current Sensor Input
Sensor type Current transformer
ACCS-420, ACCS-420-L and ACCS-010
Amperage range Header selectable
ACCS-420/010= 100/150/200A
ACCS-420-L= 10/20/50A
Overload (continuous)
ACCS-420/010= 175/300/400A
ACCS-420-L = 80/120/200A
Output (Representing 0–100% of full
scale input range)
ACCS-420(-L)= 4–20mA DC loop
powered; ACCS-010= 0–10V DC
Power supply ACCS-420(-L)= Loop
powered, 15–36V DC
ACCS-010= Self powered
Accuracy 1% of full scale
Response time 250ms (10–90%)
Isolation voltage 2,000V
Frequency 50–60Hz
Attenuator Input
Attenuator type HVA-1000,
dierential resistive attenuator
Max input voltage 1000V DC
Attenuation factor 1000 ±0.1%
Input impedance 3.8MΩ
Output impedance 3.8kΩ
Ambient dri 50ppm/°C max
Copyright © 2016 Dene Instruments Ltd
ZEN-RTU-DS-17V01 (0919)
Zen RTU/U & Zen RTU/R
New Zealand (Head O ce)
Ph: +64 (9) 835 1550
sales@de neinstruments.co.nz
www.de neinstruments.co.nz
United States (Dallas, TX)
Ph: (214) 926 4950
sales@de neinstruments.com
www.de neinstruments.com
South Africa (Pretoria)
sales@de neinstruments.co.za
www.de neinstruments.co.za
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