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Multi-Channel RTU

  • Zen RTU/U 16 Channel Remote Terminal Unit, Isolated Universal Input FREE Configuration Software

    Zen RTU/U 16 Channel Remote Terminal Unit, Isolated Universal Input FREE Configuration Software. Find out everything you need to know about the Define Instruments Zen RTU/U (Universal Input, Med Voltage) * in just 30 seconds with our quick video overview.
    Zen RTU/U (Universal Input, Med Voltage) *

    CUSTOMIZABLE PRODUCT: This product is available in custom configurations for OEMs and high volume orders (over 100 pieces). If you have a difficult application that requires our engineering input, please call 1-888-652-4757 so we can assist you.

    Power Supply & Port 1 Configuration
    (Please Select)
    • Bridge Key - $

      Universal USB Communications Kit

        Out of stock. Pre-order available.

    What it does:
    Enables sophisticated monitoring and control of up to 16 input signals from a variety of sources

    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 flexible and powerful monitoring and control station is the last word in RTU technology.

    Enjoy the flexibility of universal inputs

    The Zen RTU 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.

    Cleans up noise

    Each of the Zen RTU channels is isolated so there’s zero cross-talk.

    Set up in just minutes

    No calibration and simple software set up with WorkBench.

    In addition to this software a Bridge Key is required for the configuration of this product. You must order one unless you already have one from a previous product purchase.

    Files for connecting to Rockwell Automation hardware

    057F000C00C90100 057F000C00C90100 [EDS file], 05-Jul-2016 | (74 KB)

    Zen Mapping EDSAOP Zen Mapping EDSAOP [L5X file], 05-Jul-2016 | (91 KB)

    Zen Mapping Generic Zen Mapping Generic [L5X File], 05-Jul-2016 | (91 KB)

    Watch how to connect the Zen RTU EtherNet/IP™ to a Logix Controller and FactoryTalk View HMI »

    Modbus Member
    Number of input channels
    Input configuration
    Isolated universal inputs: Current, Voltage, RTD, Thermocouple, Potentiometer, Digital Pulse, Current Sensor or Attenuator input
    See below for input specifications for each input type
    Input isolation
    2,500V AC for 1 minute between all input channels
    Isolation test voltage
    1000V DC for 1min between analog inputs
    16 bits
    Accurate to
    <±0.1% fso (unless otherwise stated for specific input dd>
    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
    Isolation test voltage
    Mains isolation test voltage 3000V AC 50Hz for 1min to all inputs and outputs
    General Specifications
    Noise immunity
    (CMRR) 160dB tested at 300V RMS 50Hz
    RF immunity
    <±1% effect fso dd>
    Permanent memory
    (E²ROM) 100,000 writes per input parameter
    Linearity & repeatability
    <±0.1% dd>
    Channel Separation
    125db minimum
    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
    T/C lead resistance
    100Ω max
    Cold junction compensation
    14 to 140°F (–10 to 60°C)
    CJC drift
    <0.02°c °c typical for all dd>
    0.1% of FSO ±1°C typical
    Sensor open
    RTD Input
    RTD input type
    Pt100 3 wire RTD DIN 43760: 1980
    Pt1000 3 wire RTD standard

    -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
    -328–572°F (-200–300°C) = ±0.1°C
    -328–1472°F (-200–800°C) = ±0.3°C
    Ambient drift
    0.003°C/°C typical
    Current Input
    0–20mA, 4–20mA
    Input impedance
    Max over-range
    Protected by PTC to 24V DC
    Linearity & repeatability
    0.1% FSO max
    0.1% FSO max
    Channel separation
    0.001% max
    Ambient drift
    0.003%/°C FSO typical
    RF immunity
    1% effect FSO typical
    Fail safe micro switch
    Prevents external loops from being interrupted in the event of a power loss to the Zen
    Voltage Input
    ±200mV, –200mV to 1V, 0–10V, 0–18V
    Input impedance
    >500KΩ on all ranges
    Maximum over voltage
    24V DC
    Linearity & repeatability
    0.1% FSO max
    0.1% FSO max
    Channel separation
    0.001% max
    Ambient drift
    0.003%/°C FSO typical
    RF immunity
    1% effect FSO typical
    Digital Pulse Input
    Frequency range
    Fast counter range
    Open collector (NPN, PNP), TTL or Clean Contact
    Frequency resolution
    Debounce counter range
    0–50Hz max
    Counter register output
    32 bit
    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
    ACCS-420/010= 175/300/400A respectively
    ACCS-420-L = 80/120/200A respectively
    (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
    1% of full scale
    Response time
    250ms (10–90%)
    Isolation voltage
    Potentiometer Input
    Potentiometer input
    Excitation voltage
    Potentiometer resistance
    <2kω low pot;>2kΩ high pot
    Field programmable zero
    0–90% of span
    Field programmable span
    Linearity & repeatability
    <±0.05% fso dd>
    Response time
    Ambient drift
    <50ppm dd>
    Attenuator Input
    Attenuator type
    Define Instruments HVA-1000
    Max input voltage
    1000V DC
    Attenuation factor
    1000 ±0.1%
    Input impedance
    Output impedance
    Attenuator type
    Differential resistive
    Ambient drift
    50ppm/°C max
    Comm Port(s)
    Modbus RTU, RS232 or RS485
    Port 1
    Select either:
    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
    Digital Inputs
    Number of digital inputs
    4 x Opto isolated inputs
    LED indication
    of each digital input
    Status, up counter, up/down counter with direction, debounced counter, frequency, gated frequency
    Counter register output
    32 bit
    Frequency range
    Input voltage
    5–30V DC
    4.6V typical
    Debounce counter range
    At 5V DC= 1.1mA; At 24V DC= 7mA
    Isolation test voltage
    1000V DC for 1min between digital input and analog input
    USB programmable
    Via USB prog port using Bridge Key USB programmer (sold separately)
    Define WorkBench
    Simple configuration using Define WorkBench
    DIN 35 rail mounting; Material: ABS inflammability V0 (UL94)
    Dimensions (H x W x D)
    2.32 x 10.04 x 5.67" (59 x 255 x 144mm), with plugs in
    25.8oz (730g)
    With EMOD = Add 0.2oz (6g)
    Environmental Conditions
    Operating temperature
    14 to 140°F (–10 to 60°C)
    Storage temperature
    –4 to 176°F (–20 to 80°C)
    Operating humidity
    5–85% RH max, non-condensing
    Certifications & Compliances
    EN 61326-1
    Complies with EN-61326-1:2006
    Emissions EN 558022-A; Immunity EN 50082-1; Safety EN 60950

    Zen Register Supplement Zen Register Supplement 18V01, 04-Oct-2018 | (3660 KB)

    Zen RTU Logix Integration User Manual Zen RTU Logix Integration User Manual 15V03, 16-Jun-2015 | (1371 KB)

    Zen RTU Manual Zen RTU Manual 17V01, 20-Sep-2017 | (3276 KB)

    Zen RTU Datasheet Zen RTU Datasheet 17V01, 19-Sep-2017 | (738 KB)

    Define WorkBench

    Define WorkBench

    Simple software to program your Zen series device

    Use Define WorkBench to simulate, configure and view data for all Zen series control stations, including:

    With a user-friendly, uncluttered design, WorkBench offers a simple interface for setting up and scaling your Zen unit, as well as retrieving and graphing your datalog.

    N.B. Version 3 features Simulation Mode and is only compatible with legacy ZEN-16 firmware 2.0.0 and later.

    Define CodeLab

    Define CodeLab

    Flexible macro programming of your Zen series device

    Define CodeLab is our advanced macro editor. It enables you to write and compile a macro for your Zen series controller using the BASIC programming language, for total programming flexibility. CodeLab is compatible with:

    The basics of CodeLab are easy to pick up for users with beginner to intermediate programming experience. We also provide a Macro Development Tutorial document, offering a simple, step-by-step introduction to CodeLab.

    Input Type
    /U Isolated Universal Input
    /R Non-Isolated RTD Input (View product page)
    Power Supply
    -HV 85-265V AC / 95-370V DC
    -MV 24-48V AC / 17-72V DC
    Port 1
      No Port 1 Comm
    -EMOD Ethernet Modbus
    Sample order codes: ZEN-RTU/U-HV, ZEN-RTU/U-MV-EMOD
      ZEN-16 Zen Datalogger Zen RTU/U Zen RTU/R
    16 Universal Isolated Inputs

    16 Non-Isolated RTD Inputs
    1GB Data Logging

    4 Digital Inputs

    2 Analog Outputs

    2 Relay Outputs



    Ethernet Modbus

    Easy setup with WorkBench

    Zen-RIO expansion option

    HMI Interface

    Universal AC/DC power supply

    Zen RTU/U (Universal Input, Med Voltage) *

All prices are in US Dollars. For pricing in other currencies, please contact us.