Siemens 6ES5420-4UA14
Siemens 6ES5420-4UA14
Siemens 6ES5420-4UA14
Siemens 6ES5420-4UA14
Siemens 6ES5420-4UA14
Siemens 6ES5420-4UA14
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6ES5420-4UA14

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Siemens 6ES5420-4UA14 is a thirty-two-point SIMATIC S5 digital input module for non-isolated 24 V DC signals. The UA14 version draws only about 30 mA from the 5 V system bus.
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Technical specifications for 6ES5420-4UA14

  • Manufacturer:
    Siemens
  • Part Number:
    6ES5420-4UA14
  • Product Family:
    Siemens Simatic S5
  • Product Type:
    Digital Input Module
  • Stock:
    1
  • Module designation:
    420
  • I/O function:
    digital input
  • Channel capacity:
    32 inputs
  • Field electrical class:
    24 V DC
  • Isolation:
    Non-isolated
  • System bus current:
    5 V, 30 mA typical
  • Power dissipation:
    7.0 W
  • Permissible unshielded line:
    As documented in the Siemens system manual
  • Enable circuit:
    Front enable input/jumper arrangement
  • Host systems:
    SIMATIC S5-135U / S5-155U
  • Rated input current:
    8.5 mA
  • Typical input delay:
    3 ms
  • Input resistance:
    2.8 kohm typical
  • Weight:
    1.049 lbs (0.476 kg)
  • Estimated shipping dimensions:
    26.3 x 21.0 x 3.5 cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Applications Connectivity Operating Environment Diagnostics

Features:

  • Accepts thirty-two non-isolated 24 V DC input signals.
  • Uses defined logic thresholds with a typical 3 ms transition delay.
  • Requires approximately 30 mA from the 5 V S5 backplane.
The UA14 suffix identifies the lower bus-current version of the S5 420 module. Its electrical data must remain separate from the otherwise similar UA13 execution.

The board provides dense acquisition for sensors and contacts whose states are read cyclically by the legacy controller program.

Maintain the common reference and route long cables according to shielding guidance. Confirm that residual sensor voltage remains below the off-state boundary before commissioning.

6ES5420-4UA14 is sourced by exact suffix to preserve its 30 mA backplane characteristic.
Verified resources for Siemens 6ES5420-4UA14:Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Collect thirty-two standard 24 V field states where S5 rack space is limited.
  • Read remote contacts over documented shielded cable distances.
  • Maintain the UA14 process-image assignment during legacy line support.
  • The 42-pin front interface carries all thirty-two signals and their shared reference.
  • Shielded field conductors may extend to the documented 1000 m maximum.
  • Unshielded lines are limited to the stated 600 m installation distance.
  • Route input cables away from contactor coils and drive output conductors that can induce voltage.
  • Keep the common reference stable across the field devices connected to the non-isolated network.
  • Include the module's 7 W dissipation when assessing cabinet temperature and airflow.
  • Logic 0 is specified up to 5 V while logic 1 begins at 13 V.
  • Measure suspect points at the terminal under load to expose leakage or excessive voltage drop.
  • Compare the live bit table with the terminal measurement before replacing the module.
Description
6ES5420-4UA14 is the UA14 execution of the high-density S5 420 input family, placing thirty-two 24 V DC channels in a 20 mm housing. The field points share the specified non-isolated reference and are transferred to the S5-135U or S5-155U process image through one compact rack position.

The board recognizes the documented off and on regions, with logic 0 up to 5 V and logic 1 beginning at 13 V. Typical delay is 3 ms, input current is about 8.5 mA and the 5 V backplane draw is approximately 30 mA—substantially different from the UA13 suffix.

Long field runs are possible only when the official routing conditions are respected: the manual states up to 600 m unshielded and 1000 m shielded. Leakage, induced voltage or a shifted common reference can make a disconnected sensor appear active, so borderline points should be measured under load rather than judged from an open-circuit meter reading.
Alternative Names
6ES5420-4UA14 6ES5420 4UA14 6ES54204UA14 Siemens 6ES5420-4UA14 6ES5420-4UA14 SIMATIC S5-135U/155U Digital I/O Siemens Digital Input Module 6ES5420-4UA14 Digital Input Module
Technical notes
6ES5420-4UA14 can interpret leakage or induced voltage as a valid input once the terminal reaches the 13 V logic-1 region; diagnose marginal channels under their real connected load.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Which voltage boundaries define Siemens 6ES5420-4UA14 logic states?
The documentation places logic 0 at up to 5 V and logic 1 from 13 V for the rated 24 V DC input system.
How long can an unshielded line be for Siemens 6ES5420-4UA14?
The stated maximum is 600 m when the official installation and interference conditions are satisfied.
What advantage does shielding give Siemens 6ES5420-4UA14 field wiring?
It permits a documented maximum line length of 1000 m and helps reduce coupled interference when installed correctly.
Why can a leaking sensor confuse Siemens 6ES5420-4UA14?
Residual voltage may rise above the off boundary and into the valid on region of the non-isolated input.
What is the 5 V bus demand of Siemens 6ES5420-4UA14?
The UA14 technical data states approximately 30 mA, which is lower than the related UA13 version.
Which measurement resolves an uncertain Siemens 6ES5420-4UA14 bit?
Read terminal voltage with the sensor and common reference connected, then compare it with the specified logic thresholds.

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