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  • Zen IoT Edge Processing Interface 4x isolated universal inputs, 2x non-isolated 4-20mA inputs – expandable IO

    Store & Forward record buffer, RTC time stamp, RS485 ModBus RTU master/slave interface, TLS 1.2

    Zen IoT Edge Processing Interface 4x isolated universal inputs, 2x non-isolated 4-20mA inputs – expandable IO. Find out everything you need to know about the Define Instruments Zen IoT 6 * in just 30 seconds with our quick video overview.
    Zen IoT 6 *

    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.

    No. of Channels & Comms Configuration (Please Select)
    Power Supply
    Wireless comms
    IO Expansion (additional to base model channels)
    • Bridge Key - $49.00

      Universal USB Communications Kit

        Out of stock. Pre-order available.

    What it does:
    Allows standalone industrial hardware to be connected to the Cloud. Can perform calculations prior to transmitting this data. Requires Bridge Key for programming. Part of the Define Instruments IoT machine monitoring solution

    Connect your standalone hardware to the Cloud with this IoT gateway with analog inputs

    The Zen IoT is a gateway device for connecting standalone equipment (PLCs or other discrete control systems) to the Cloud.

    Use it also for Edge Processing: when you need to collate data, perform calculations and send the results to the Cloud. The Zen IoT allows this with ease. Calculations are performed within the device and resulting data communicated via a choice of Cloud connection options.

    Data visibility for better machine performance

    The Zen IoT collates signals from industrial equipment for processing and publishing to the Cloud. It enables visibility for determining machine health or process efficiency.

    Access Zen IoT from your smartphone

    Convert process signals direct to wireless

    While most devices only convert Modbus to wireless, the Zen IoT converts process signals straight to wireless! No additional devices needed. The unit features industrial grade analog and digital I/O, with 4–20mA, RTD, TC and many more available.


    Zen IoT Datasheet A4 Zen IoT Datasheet A4 v6, 11-Dec-2019 | (812 KB)

    Integrates with all your existing equipment

    It's now simpler than ever to connect your industrial equipment to the Cloud, as the Zen IoT supports a wide range of communication protocols.

    Modbus is supported, as well as new IoT comms like MQTT. Physical connections include WiFi (801.11) or (eMTC) LTE Cat-M1 and RS485. Potential applications include AMR (Automatic Meter Reading), remote monitoring of assets, and data collation and transmission.

    Available in Custom configurations

    Custom PCB

    This product is available in custom configurations for OEMs and high volume orders. If you have a difficult application, please call 1-888-652-4757 so we can assist you.

    Uses extra layer of IoT security

    Privacy and security are big concerns but the Zen IoT gives you peace of mind. It has its own WiFi port and connects with an extra layer of security: Transport Layer Security (TLS). Additionally it has an ethernet port which uses only Modbus TCP so the port cannot be hijacked for any other communication uses.

    Additionally, the Zen IoT offers a flexible logic engine which can be programmed with a powerful scripting language for custom applications.

    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.

    Key Features:

    • Up to 22 analog inputs
    • Up to 40 digital input/outputs
    • 8 isolated process outputs (4-20mA)
    • Up to 7 relay outputs
    • RS484 ModBus RTU master/slave interface
    • Local display (RS232C) interface port
    • AC mains and 24V low power operation
    • Application logic and math functions
    • Define Cloud Services (DCS) connection
    • MQTT with Transport Layer Security (TLS 1.2)
    • Data record store and forward record buffer
    • Easy USB programming via PC  using Define WorkBench software, requires Bridge Key

    Cloud Connection Options:


    WiFi (801.11)

    Enables LOS transmission of up to 1476ft (450m) using the supplied 3dBi wireless antenna.

    External 3G or 4G Modem

    (eMTC) LTE Cat-M1

    4G cellular interface for Internet of Things (IoT) and machine-to-machine (M2M) communications

    The Zen IoT is preconfigured to connect to Define Cloud Services (DCS). Custom connection is available to your own or third party server. Cloud communication is secured using TLS and uses MQTT IoT service transfer protocol.

    Define WorkBench configures the Zen IoT for analog and digital inputs, alarms, totalizers and counters, custom scaling for linearization and scale setup. The cloud onterface module configures data transfer to a cloud server and sends JSON packets containing the industry standard SenML (Sensor markup language) data.

    Input configuration

    ZEN6: 4x Universal inputs (isolated) plus 2x 4-20mA inputs (non-isolated)
    UI4: 8x Universal inputs (isolated) plus 2x 4-20mA inputs (non-isolated)
    UI8: 12x Universal inputs (isolated) plus 2x 4-20mA inputs (non-isolated)
    UI12: 16x Universal inputs (isolated) plus 2x 4-20mA inputs (non-isolated)
    PI16: 4x Universal inputs (isolated) plus 2x 4-20mA inputs (non-isolated) plus 16 partially isolated 4-20mA inputs
    UI6E4: 4x Universal inputs (isolated) plus 2x 4-20mA inputs (non-isolated)
    Input isolation
    2,500V AC 1 minute between all input channels
    Isolation test voltage
    1000V DC for 1min (Analog input to digital output, Analog input to analog input)
    24V DC @200mA maximum. Total on all +24V output pins.
    16 bits
    <±1.0% fso (unless otherwise dd>
    Accurate to
    <±0.1% fso (unless otherwise stated in input dd>
    Power supply
    85-265V AC/DC (HV) 10–30V DC (LV)
    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

    -328–572°F (-200–300°C), 0.02°F (0.01°C) resolution
    -328–1472°F (-200–800°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
    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
    (continuous) ACCS-420/010= 175/300/400A
    ACCS-420-L = 80/120/200A
    (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, differential resistive attenuator
    Max input voltage
    1000V DC
    Attenuation factor
    1000 ±0.1%
    Input impedance
    Output impedance
    Ambient drift
    50ppm/°C max
    Relay Output
    Number of relay outputs
    Relay output type

    1 x Change over Form C Relay (15A 250V AC or 15A 30V DC)
    2 x Form A Relays (3A 250V AC or 3A 30V DC)
    Comm Port(s)
    Modbus RTU, RS485, RS232 or Define ASCII
    Default comm port
    RS485 / RS232 auto-select. Selectable baud rate 2400–230000 baud. Format 8 bit, no parity, 1 stop
    Isolation test voltage
    1000V DC for 1min (Comm to analog input, Comm to digital input/output)
    Optional additional comm
    (front panel) Select WiFi, Ethernet IoT or RS485/232 (auto-detecting)
    Digital Inputs
    Number of digital inputs
    Input types
    NPN, PNP, Clean Contact, Voltage 2–30V DC
    Status, up counter, up/ down counter with direction, debounced counter, frequency, gated frequency
    Counter register output
    32 bit
    Frequency range
    (Reduced to 0–1,000Hz in Sleep Mode)
    1.2V typical
    Debounce counter range
    Not isolated to power supply or analog inputs
    Data Logging
    Real-time clock
    RTC time base UTC. Local time in device with automatic daylight savings adjustment
    Data logging
    31,744 samples with up to 30 parameters plus time stamp per sample. 32MB capacity.
    Datalog retrieval
    Simple data log retrieval and visualization, using Define WorkBench
    USB programmable
    Via 'PC Setup' port using Bridge Key USB programmer (sold separately)
    Define WorkBench
    Simple configuration and datalog retrieval using Define WorkBench
    DIN 35 rail mounting; Material: ABS inflammability V0 (UL94); Phoenix type removable screw terminal connectors
    Dimensions (H x W x D)

    ZEN6, ZEN6-UI4
    = 3.98 x 1.73 x 4.72" (101 x 48 x 120mm)*
    UI8, UI12, PI16, UI64
    = 3.98 x 2.87 x 4.72" (101 x 73 x 120mm)*
    *Excludes antenna and connectors
    Required mounting height With Antenna= 4.65" (118mm), WiFi model only
    Environmental Conditions
    Operating temperature
    –40 to 176°F (–40 to 80°C)
    Storage temperature
    –40 to 176°F (–40 to 80°C)
    Operating humidity
    5–85% RH max, non-condensing
    Certifications & Compliances
    EN 61326-1
    UL listed
    File listing pending
    Emissions EN 61326-1 2006 Class A; Immunity EN 613265-1 2006 Industrial Locations; EN50581: 2012 RoHS; Safety EN 61010, 1:2010

    Zen IoT Manual (Zen6) Zen IoT Manual (Zen6) 19V04, 11-Dec-2019 | (1614 KB)

    Zen IoT Datasheet A4 Zen IoT Datasheet A4 v6, 11-Dec-2019 | (812 KB)

    Zen IoT Datasheet US Letter Zen IoT Datasheet US Letter v6, 11-Dec-2019 | (811 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.

    Base configuration: MQTT cloud service interface - TLS secuirty layer, store and forward record buffer, RTC data time stamp, 4x isolated universal inputs (TC/RTD/V/mA/SCII)
    Power supply
    -HV 85-265V AC
    -LV 10-32V DC 
    Comms Configuration
    - No wireless communication
    -CM1 Cellular modem (eMTC) LTE Cat-M1
    -WIF WiFi (801.11)
    Optional analog IO expansion
    - No additional analog IO
    -UI4 ADD 4x Universal input (isolated)
    -UI8 ADD 8x Universal input (isolated)
    -UI12 ADD 12x Universal input (isolated)
    -PI16 ADD 16x process (4-20mA) input (non-isolated)
    -UI6E4 ADD 6x Universal input (isolated), 4x process (4-20mA) output (isolated)
    -PI8E8 ADD 8x process (4-20mA) input (non-isolated), 8x process (4-20mA) output (isolated)
    Bridge Key USB Bridge Key and communications kit (Sold separately)
    Define WorkBench Simple utility for setting up your Zen IoT

    Zen IoT 6 *

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