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6ES5420-7LA11

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The Siemens 6ES5420-7LA11 functions as a high-channel-count digital input interface within SIMATIC S5-115U, S5-115H, and S5-115F controller architectures.
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Technical specifications for 6ES5420-7LA11

  • Manufacturer:
    Siemens
  • Part Number:
    6ES5420-7LA11
  • Product Family:
    Siemens Simatic S5
  • Product Type:
    Digital Input Module
  • Stock:
    1
  • Number of inputs:
    32 inputs
  • Galvanic isolation:
    None
  • Rated input voltage:
    24 V DC
  • Signal 0 voltage range:
    -30 V to +5 V
  • Signal 1 voltage range:
    +13 V to +30 V
  • Typical input current at signal 1:
    8.5 mA
  • Signal propagation delay (0 to 1):
    1.4 ms to 4.5 ms
  • Signal propagation delay (1 to 0):
    1.4 ms to 4.5 ms
  • Permissible load factor at 55 °C:
    100%
  • Maximum unshielded cable length:
    600 m (1968 ft)
  • Insulation voltage class:
    1000 m (3280 ft)
  • Internal 5 V backplane current consumption:
    In accordance with VDE 0160
  • Typical power dissipation under rated load:
    Max. 5 mA
  • Front terminal connector requirement:
    46-pin
  • Weight:
    1.5 lbs (0.7 kg)
  • 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 System Compatibility Operating Environment Programming

Features:

  • 32 high-density digital input channels configured for 24 V DC process signal monitoring.
  • Direct non-isolated signal paths enabling high-speed binary input updating to the PLC.
  • Front-panel LED status displays for quick real-time channel activity inspection.
This unit is supplied as an authentic Siemens 6ES5420-7LA11 digital input module in original new-surplus or fully tested refurbished condition, delivered ready for immediate system installation.

The module functions as a primary binary interface, gathering field signal transitions from limit switches and sensors and transferring them straight into the controller memory.

Installation requires one available slot in a SIMATIC S5-115U subrack together with a 46-pin front connector, secured with top and bottom retaining screws.

The Siemens 6ES5420-7LA11 is a legacy product fully supported with genuine quality inspection by the manufacturer (OEM).
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.
  • Monitors binary position switches and sensor states across automated manufacturing lines.
  • Collects field feedback from pressure switches and valve limit contacts in process plants.
  • Interconnects safety interlocks and control pushbuttons within central PLC enclosures.
  • Designed for native plug-and-play operation inside SIMATIC S5-115U, S5-115H, and S5-115F subracks.
  • Supported in S5-135U and S5-155U programmable controller chassis when fitted with adapter casings.
  • Operates reliably within central controllers or connected expansion racks using standard interface modules.
  • Operates continuously at full 100% load factor across ambient cabinet temperatures up to 55 °C.
  • Built to meet VDE 0160 industrial standards for electrical clearance and insulation reliability.
  • Designed with high electromagnetic interference immunity for harsh plant automation environments.
  • Maps 32 input channels to 4 contiguous bytes within the central controller Process Image Input (PII) table.
  • Fully supported by STEP 5 programming tools for standard cyclic address referencing and logic polling.
  • Requires zero software parameterization or jumper setup prior to program execution in the CPU.
Description
Siemens 6ES5420-7LA11 digital input module serves as a high-density binary signal interface engineered to seamlessly integrate field-level switch states into SIMATIC S5 central processing units. Designed for standard 24 V DC control circuits, it enables reliable digital state collection from proximity switches, pushbuttons, relay contacts, and sensors across automated manufacturing racks.

Consolidating 32 discrete digital input channels into a single physical subrack slot, the Siemens 6ES5420-7LA11 optimizes panel space efficiency inside industrial control enclosures. The module features integrated front-panel green status LEDs that deliver real-time visual channel verification, simplifying routine system monitoring and field diagnostic checks.

The Siemens 6ES5420-7LA11 is widely deployed in heavy manufacturing, automotive assembly lines, chemical processing plants, and material handling systems for monitoring valve positions, conveyor interlocks, limit switches, and machine safety guarding. Operating natively within S5-115U, S5-115H, and S5-115F racks, it also adapts to larger S5-135U or S5-155U process control architectures.
Alternative Names
6ES5420-7LA11 6ES54207LA11 6ES5-420-7LA11 6ES5 420-7LA11 6ES5 420 7LA11 6es54207la11 Siemens 6ES5420-7LA11 Siemens Simatic S5
Technical notes
The Siemens 6ES5420-7LA11 must be wired using a designated 46-pin front connector, with custom signal channel identification applied directly to the designated marking strip adjacent to the green status LEDs.
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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.
How many total digital input signals can a single Siemens 6ES5420-7LA11 module process?
A single Siemens 6ES5420-7LA11 module accommodates up to 32 discrete digital input channels, allowing high-density field signal connections within one chassis slot.
What is the rated input voltage required to trigger an active state on the Siemens 6ES5420-7LA11?
The Siemens 6ES5420-7LA11 operates with a rated input voltage of 24 V DC for standard sensor output signals.
What type of front connector is required to wire field sensors to the Siemens 6ES5420-7LA11?
Field wiring for the Siemens 6ES5420-7LA11 connects via a removable 46-pin front terminal connector block.
Can the Siemens 6ES5420-7LA11 be installed in S5-135U or S5-155U expansion racks?
Yes, the Siemens 6ES5420-7LA11 can be operated in S5-135U and S5-155U programmable controller systems when mounted using an appropriate Siemens adapter casing.
How does a maintenance technician visually inspect input channel activity on the Siemens 6ES5420-7LA11?
The front panel of the Siemens 6ES5420-7LA11 includes individual green LED indicators that illuminate when a logic "1" signal is detected on the corresponding input.
Is special hardware required to lock the Siemens 6ES5420-7LA11 module into an S5 subrack?
The Siemens 6ES5420-7LA11 slides directly into standard subrack card guides and secures using the built-in top and bottom retaining screws.

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