Table Of Contents

NI 9350 Specifications

    Last Modified: June 15, 2020

    The following specifications are typical for the range -40 °C to 70 °C unless otherwise noted.


    Do not operate the NI 9350 in a manner not specified in this document. Product misuse can result in a hazard. You can compromise the safety protection built into the product if the product is damaged in any way. If the product is damaged, return it to NI for repair.

    Input/Output Characteristics

    Number of channels

    8 digital input, 8 digital output

    Digital Input

    Input type


    Input voltage range

    0 V to 30 V

    Digital logic levels

    Input voltage

    ≤6.0 V


    Input voltage

    ≥11.0 V

    Input current at 24 V

    1.1 mA


    3.0 V

    Figure 1. Digital Input Sinking Current vs Digital Input Voltage

    Input voltage protection

    ±30 V DC

    Input Signal Response Time


    For more information on how to calculate input signal response times, refer to the C Series Functional Safety Manual on

    Input signal response time (1 to 0)

    Single or dual input

    57 µs

    Single or dual input with test pulses

    165 µs


    Input signal response time (1 to 0) assumes a 3 kΩ external pull-down, 50 m cable length with capacitance <180 pF/m, and the debounce filter and test pulse width set to the minimum values for the given configuration.

    Input signal response time (0 to 1)

    Single input

    20 µs

    Dual input

    122 µs

    Single input with test pulses

    346 µs

    Dual input with test pulses

    649 µs


    Input signal response time (0 to 1) assumes the debounce filter, test pulse width, and discrepancy time are set to minimum values for the given configuration.

    Digital Output

    Output type


    Minimum ON time

    190 μs


    You must enforce minimum ON time or the channel may fail to de-energize in an overcurrent or short-circuit condition. Failure to de-energize in an overcurrent or short-circuit condition may damage the module.

    Minimum OFF time

    170 μs


    You must enforce minimum OFF time except when the channel is configured with test pulses. Test pulse width may be smaller than the minimum OFF time.

    Continuous output current (per channel)

    250 mA, maximum

    ON state voltage drop (Vsup pin to DO pin)

    45 mV + (channel output current) × 0.3 Ω, maximum

    OFF state leakage current

    0.2 mA, maximum

    Required external load

    50 kΩ, maximum


    The required external load must be present on DO configurations with internal readback or internal test pulse. A readback fault or test pulse fault may occur if the required external load is not present.

    Load capacitance

    0.5 μF, maximum

    Cable length

    200 m, maximum

    Output signal response time[1]

    5 μs, maximum

    Open circuit detection

    11 mA

    2 mA, minimum

    20 mA, maximum



    0 V to Vsup, maximum

    Reverse Voltage


    Overcurrent channel disable

    >250 mA, minimum

    340 mA, maximum


    Transient loads exceeding overcurrent protection will trigger an overcurrent fault. This does not apply to inrush currents required to drive the specified load capacitance and cable length.

    Power Requirements

    Power consumption from chassis

    Active mode

    60 mW, maximum

    Sleep mode

    200 μW, maximum

    Thermal dissipation (at 70 °C)

    Active mode

    1.6 W, maximum

    Sleep mode

    1.6 W, maximum

    External Power Supply Requirements


    You must use an appropriate power source to limit output power in case of a fault. For a list of required power supply categories, refer to the C Series Functional Safety Manual on

    Voltage input range

    19 V DC to 30 V DC


    The NI 9350 includes input power protection circuitry. If the voltage at Vsup falls outside the voltage input range, the module will power down and all channels will de-energize. You must cycle external power to the module to resume operation.

    Power consumption, active or sleep mode

    No DO load

    1.05 W, maximum

    Full DO load, 30 V input

    61.6 W, maximum

    Physical Characteristics

    If you need to clean the module, wipe it with a dry towel.


    For two-dimensional drawings and three-dimensional models of the C Series module and connectors, visit and search by module number.

    Spring terminal wiring

    Wire length

    61 cm (24 in.), minimum

    COM jumper length

    61 cm (24 in.), minimum


    0.50 mm2 to 1.5 mm2 (20 AWG to 16 AWG) copper conductor wire, if using single wire per spring terminal; 0.34 mm2 (22 AWG) copper conductor wire, if using two wires per spring terminal

    Wire strip length

    10 mm (0.39 in.) of insulation stripped from the end

    Insulation temperature rating

    90 °C, minimum

    Wires per spring terminal

    One solid or stranded wire per spring terminal; two stranded wires per spring terminal using a two-wire ferrule


    Single ferrule, uninsulated

    0.50 mm2 to 1.5 mm2 (20 AWG to 16 AWG), 10 mm barrel length

    Single ferrule, insulated

    0.50 mm2 to 1.0 mm2 (20 AWG to 18 AWG), 12 mm barrel length

    Two-wire ferrule, insulated

    2x 0.34 mm2 (2x 22 AWG), 12 mm barrel length

    Connector securement

    Securement type

    Screw flanges provided

    Torque for screw flanges

    0.25 N · m (2.2 lb · in.)


    210 g (7.4 oz)

    Safety Voltages

    Connect only voltages that are within the following limits:


    Do not connect hazardous voltages to the NI 9350. A hazardous voltage is a voltage greater than 42.4 V peak voltage or 60 V DC to earth ground.

    Maximum voltages


    30 V DC


    30 V DC


    0 V DC to Vsup


    DO channels are not protected for negative voltages or voltages greater than Vsup.

    Isolation voltages
    Channel-to-earth[3] (up to 5,000 m)


    60 V DC, Measurement Category I


    1,000 V RMS, verified by a 5 s dielectric withstand test

    Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage. MAINS is a hazardous live electrical supply system that powers equipment. This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics.


    Do not connect the NI 9350 to signals or use for measurements within Measurement Categories II, III, or IV.


    Measurement Categories CAT I and CAT O are equivalent. These test and measurement circuits are for other circuits not intended for direct connection to the MAINS building installations of Measurement Categories CAT II, CAT III, or CAT IV.

    Hazardous Locations

    U.S. (UL)

    Class I, Division 2, Groups A, B, C, D, T4; Class I, Zone 2, AEx nA IIC T4 Gc

    Canada (C-UL)

    Class I, Division 2, Groups A, B, C, D, T4; Ex nA IIC T4 Gc

    Europe (ATEX) and International (IECEx)

    Ex nA IIC T4 Gc

    Functional Safety Standards

    This product is designed for Functional Safety applications and meets the following standards:

    • IEC/EN 61508:2010; Functional Safety of Electrical Systems, Second Edition
    • IEC/EN 62061; Safety of Machinery
    • IEC/EN 61511; Safety Instrumented Systems for the Process Industry Sector

    Functional Safety Certification

    Safety Integrity Level

    SIL3 (IEC 61508)

    Hardware fault tolerance


    Useful lifetime

    At 55 °C

    20 years

    At 70 °C

    10 years

    Table 1. IEC 61508 Failure Rates in FIT[4]
    Failure Categories λSD λSU λDD λDU
    Common, sea level 419 10 282 10
    Common, 2,000 m 858 11 720 10
    Common, 5,000 m 4,100 14 3,970 13
    DI common 7.0 0.1 19 0.2
    DI per channel 14 2.2 15 0.5
    DO per channel 39 0.7 0.2 0.2

    Safety and Hazardous Locations Standards

    This product is designed to meet the requirements of the following electrical equipment safety standards for measurement, control, and laboratory use:

    • IEC 61010-1, EN 61010-1
    • UL 61010-1, CSA C22.2 No. 61010-1
    • EN 60079-0:2012, EN 60079-15:2010
    • IEC 60079-0: Ed 6, IEC 60079-15; Ed 4
    • UL 60079-0; Ed 6, UL 60079-15; Ed 4
    • CSA C22.2 No. 60079-0, CSA C22.2 No. 60079-15

    For UL and other safety certifications, refer to the product label or the Online Product Certification section.

    Electromagnetic Compatibility

    This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use:

    • EN 61326-1 (IEC 61326-1): Class B emissions; Basic immunity
    • EN 61326-3-1 (IEC 61326-3-1): Functional Safety Industrial Locations; Class B emissions; Industrial immunity
    • EN 55011 (CISPR 11): Group 1, Class A emissions
    • EN 55022 (CISPR 22): Class A emissions
    • EN 55024 (CISPR 24): Immunity
    • AS/NZS CISPR 11: Group 1, Class A emissions
    • AS/NZS CISPR 22: Class A emissions
    • FCC 47 CFR Part 15B: Class A emissions
    • ICES-001: Class A emissions

    In the United States (per FCC 47 CFR), Class A equipment is intended for use in commercial, light-industrial, and heavy-industrial locations. In Europe, Canada, Australia and New Zealand (per CISPR 11) Class A equipment is intended for use only in heavy-industrial locations.


    Group 1 equipment (per CISPR 11) is any industrial, scientific, or medical equipment that does not intentionally generate radio frequency energy for the treatment of material or inspection/analysis purposes.


    For EMC declarations and certifications, and additional information, refer to the Online Product Certification section.

    CE Compliance

    This product meets the essential requirements of applicable European Directives, as follows:

    • 2014/35/EU; Low-Voltage Directive (safety)
    • 2014/30/EU; Electromagnetic Compatibility Directive (EMC)
    • 2014/34/EU; Potentially Explosive Atmospheres (ATEX)

    Online Product Certification

    Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, visit, search by model number or product line, and click the appropriate link in the Certification column.

    Shock and Vibration

    To meet these specifications, you must panel mount the system.

    Operating vibration

    Random (IEC 60068-2-64)

    5 grms, 10 Hz to 500 Hz

    Sinusoidal (IEC 60068-2-6)

    5 g, 10 Hz to 500 Hz

    Operating shock (IEC 60068-2-27)

    30 g, 11 ms half sine; 50 g, 3 ms half sine; 18 shocks at 6 orientations


    Refer to the manual for the chassis you are using for more information about meeting these specifications.

    Operating temperature (IEC 60068-2-1, IEC 60068-2-2)

    -40 °C to 70 °C

    Storage temperature (IEC 60068-2-1, IEC 60068-2-2)

    -40 °C to 85 °C

    Ingress protection


    Operating humidity (IEC 60068-2-78)

    10% RH to 90% RH, noncondensing

    Storage humidity (IEC 60068-2-78)

    5% RH to 95% RH, noncondensing

    Pollution Degree


    Maximum altitude

    5,000 m

    Indoor use only.

    Environmental Management

    NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers.

    For additional environmental information, refer to the Minimize Our Environmental Impact web page at This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document.

    Waste Electrical and Electronic Equipment (WEEE)

    EU Customers  

    At the end of the product life cycle, all NI products must be disposed of according to local laws and regulations. For more information about how to recycle NI products in your region, visit



    National Instruments符合中国电子信息产品中限制使用某些有害物质指令(RoHS)。关于National Instruments中国RoHS合规性信息,请登录。(For information about China RoHS compliance, go to

    • 1 Includes delay time from a change in safety processing logic output to the digital output turning off. This does not include the discharge time for the output load. For more information on response times, refer to the C Series Functional Safety Manual on
    • 2 Includes 26-pin spring terminal and connector backshell.
    • 3 Channels include Vsup and COM.
    • 4 1 FIT = 1 failure/109 hours

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