Siemens ed1055-1nb10-0ba2

By Abdullah Zahid
14 min read
Siemens 6ED1055-1NB10-0BA2 LOGO! DM16 24R expansion module with 8 relay outputs for LOGO! 8 PLC DIN rail installation

Siemens 6ED1055-1NB10-0BA2 LOGO! DM16 24R Expansion Module: Specifications, Compatibility and Selection Guide

If you are an automation engineer or panel builder with a LOGO! 8 base unit already in the panel and you need more I/O points, the Siemens 6ED1055-1NB10-0BA2 is likely the part on your BOM. This compact DIN-rail mounted expansion module adds 8 digital inputs and 8 floating relay outputs to any LOGO! 8 host, operating on 24 V DC, and fits in a 71.5 mm wide footprint — four spacing units on a 35 mm rail. The relay contacts are floating, which means they switch AC or DC loads without modification, making this module a practical fit for multi-voltage control panels where galvanic isolation between the control circuit and the load circuit is a requirement.

If you have already confirmed this is the right part, check current pricing and availability for the Siemens 6ED1055-1NB10-0BA2 at LeadTime.ca — ships worldwide.

Who Should Buy the Siemens 6ED1055-1NB10-0BA2 — and Who Shouldn't

This module is the right choice when all of the following are true for your application:

  • A LOGO! 8 base unit is already installed or specified — this module is not compatible with LOGO! 5 or LOGO! 7
  • Your control circuit runs on 24 V DC and your power supply delivers a stable 20.4–28.8 V DC range
  • You need floating relay outputs capable of switching up to 5 A ohmic or 3 A inductive loads per contact
  • Switching frequency does not exceed 2 Hz for ohmic loads or 0.5 Hz for inductive loads
  • You have a minimum 72 mm (4 spacing units) of contiguous DIN rail space adjacent to the LOGO! 8 unit
  • All output loads draw at least 100 mA — relay contacts may not switch reliably below this threshold

If your application requires analog inputs or outputs, consider the LOGO! AM2 analog module. If switching frequency must exceed 2 Hz, a transistor-output expansion module is the correct choice. If output current per circuit exceeds 5 A, an external contactor or a higher-capacity controller is required.

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What the Siemens 6ED1055-1NB10-0BA2 Actually Does in a Live System

The Siemens 6ED1055-1NB10-0BA2 LOGO! DM16 24R is a slave I/O expansion module — it has no independent processing capability and functions only when connected to a LOGO! 8 base unit. Its job is straightforward: it extends the physical I/O capacity of the base controller by adding 8 digital inputs and 8 relay outputs to the same program environment without requiring a separate controller, additional communication wiring, or a larger cabinet footprint.

The 8 digital inputs accept 24 V DC signals with a signal-high threshold above 12 V DC and a response delay of no more than 1.5 ms on both rising and falling edges. This is fast enough for limit switches, proximity sensors, pushbuttons, and float switches in standard automation sequences. The 8 relay outputs are floating contacts — meaning neither terminal of the relay output is hard-tied to the module's own power supply common. This gives the installer freedom to use the same relay output to switch a 24 V DC solenoid coil on one terminal pair and a 230 V AC motor contactor coil on another terminal pair, provided the loads stay within the 5 A ohmic and 3 A inductive per-contact ratings.

The module carries CE, UL, CSA, and FM certifications alongside compliance with IEC 61131 and VDE 0631. That multi-certification profile matters for OEM machine builders who ship equipment to North America, Europe, and markets requiring FM approval — specifying one module that clears all four approval bodies removes a documentation burden from the project.

Typical System Architecture for LOGO! 8 with DM16 24R Expansion

The Siemens 6ED1055-1NB10-0BA2 sits immediately to the right of the LOGO! 8 base unit on the DIN rail, extending the I/O address space the base unit program can reference. Here is the typical component chain in a deployed system:

  • 24 V DC power supply — feeds both the LOGO! 8 base unit and the 6ED1055-1NB10-0BA2 expansion module from a common or split supply
  • LOGO! 8 base unit — runs the user program, manages I/O addressing for both onboard and expansion module channels
  • Siemens 6ED1055-1NB10-0BA2 — mounted directly adjacent on the same 35 mm DIN rail, adding 8 input addresses and 8 relay output addresses to the program
  • Field sensors and switches — wired to the 8 digital input terminals on the expansion module (limit switches, proximity sensors, float switches, pushbuttons)
  • Load devices — wired to the 8 relay output terminals (solenoid valves, motor starter coils, indicator lights, alarm annunciators) with external overcurrent protection in series

Where Engineers Deploy the LOGO! DM16 24R: Industries and Use Cases

In packaging and assembly machinery, the 6ED1055-1NB10-0BA2 is a common choice for adding sensor inputs for part detection, feed monitoring, and safety gate status alongside relay outputs for air cylinder solenoid valves and belt conveyor motor starters — all within the footprint of the existing LOGO! 8 panel without requiring a larger enclosure.

In water and wastewater treatment, the module's floating relay contacts allow the same module to switch both low-voltage control signals and line-voltage pump motor starters. Pump motor status, float switch inputs, and pressure transducer signals land on the 8 digital inputs while relay outputs drive proportional dosing valve actuators and automated gate controls.

HVAC and building automation retrofit projects frequently specify this module when an existing LOGO! 8 installation needs additional damper actuator controls, fan relay switching, or thermostat zone inputs added without replacing the controller. The compact 71.5 x 90 x 58 mm body and IP20 protection class suit panel-mounted installations where space is already constrained.

OEM machine builders deploying LOGO! 8 as a standard platform across multiple machine variants use the 6ED1055-1NB10-0BA2 to add conditional logic for alarms, interlocks, and safety functions to higher-I/O-count variants without maintaining a separate BOM entry for a different base controller. The module's CE, UL, and CSA certification stack means one part number clears most markets without re-engineering the panel.

Application Typical Deployment
Packaging machinery Sensor inputs for part detection; relay outputs for solenoid valves and motor starters
Water and wastewater treatment Float switch and pressure sensor inputs; relay outputs for dosing valve actuators and pump starters
HVAC and building automation retrofit Thermostat zone inputs; relay outputs for damper actuators and fan switching
OEM machine control Expanding I/O on standard LOGO! 8 platform for alarm, interlock, and safety relay logic
Automation training labs Hands-on LOGO! 8 programming with multiple input and relay output channels for student exercises

Siemens 6ED1055-1NB10-0BA2 Specifications That Drive the Purchase Decision

Specification Value
Power Supply Voltage 24 V DC (operating range: 20.4–28.8 V DC)
Digital Inputs 8 x 24 V DC (signal 1: >12 V DC; signal 0: <5 V DC)
Digital Outputs 8 x floating relay contacts
Relay Output Rating — Ohmic 5 A max per contact
Relay Output Rating — Inductive 3 A max per contact
Switching Frequency 2 Hz ohmic / 0.5 Hz inductive / 10 Hz mechanical (no load)
Minimum Load Current 100 mA per relay output
Dimensions (W x H x D) 71.5 x 90 x 58 mm (4 spacing units on 35 mm DIN rail)
Operating Temperature 0–55°C standard; -20–55°C (ES03 version and later)
Certifications CE, UL, CSA, FM, IEC 61131, VDE 0631

Full technical specifications are available on the product page at LeadTime.ca.

LOGO! DM16 24R vs. Transistor Output vs. Analog Module: Which One Do You Need?

Module Output Type Best Fit Limitation
6ED1055-1NB10-0BA2 LOGO! DM16 24R (this product) Floating relay contacts AC/DC load isolation, mixed-voltage panels, motor starter coils, solenoid valves 2 Hz max switching; no analog capability; 5 A per contact ceiling
LOGO! DM16 R (transistor output variant) Transistor (DC only) High-frequency switching, DC-only loads, applications requiring kHz-range output toggling DC loads only; requires separate output power supply; no galvanic isolation
LOGO! AM2 analog module Analog I/O Voltage and current signal measurement, proportional valve control, analog setpoint input No digital relay outputs; different module type entirely
Larger LOGO! 8 base unit Integrated I/O (mixed) Higher onboard I/O count without module stacking Higher upfront cost; requires panel space replanning

If your architecture requires AC and DC load switching from the same output module without external isolation components, the Siemens 6ED1055-1NB10-0BA2 is the correct choice — check current availability and pricing at LeadTime.ca.

Expert Verdict: Honest Assessment for Controls Engineers

The Siemens 6ED1055-1NB10-0BA2 LOGO! DM16 24R does exactly what it is rated to do, reliably and within a compact footprint. The floating relay contacts are the module's defining advantage: they give a panel builder genuine flexibility to switch mixed-voltage load circuits — 24 V DC control coils and line-voltage contactor coils — from the same module without adding external isolation relays. The 5 A ohmic rating per contact is appropriate for the majority of small-machine automation tasks: starter coils, solenoid valves, indicator lights, and alarm annunciators. The CE, UL, CSA, and FM certification stack is a genuine procurement advantage for OEM builders supplying equipment to multiple geographic markets. LOGO! 8 installations with this module have accumulated extensive field hours across packaging, HVAC, and water treatment applications globally — this is a proven architecture, not a first-generation product.

Where this module has real limits: it is not the right choice if switching frequency above 2 Hz is required, if any output load draws below 100 mA, or if any output needs to exceed 5 A without an external contactor. The complete absence of integrated short-circuit protection is a specification the datasheet states explicitly — external overcurrent devices must be added to every relay output circuit, which adds BOM items and installation steps that buyers sometimes miss on the first pass. If your application is entirely digital and relay-speed control is adequate, this module belongs on the BOM. If you are specifying analog control loops, the LOGO! AM2 is the correct expansion module.

From a procurement standpoint, the 6ED1055-1NB10-0BA2 is an active product in the Siemens LOGO! family with distribution through major industrial channels worldwide. Lead times from stock range from same-day to two to four weeks depending on regional inventory. Volume pricing is available, and bundling with other LOGO! 8 accessories in a single order typically improves lead time and unit cost. If you are vetting availability for a build, view current stock and pricing for the Siemens 6ED1055-1NB10-0BA2 at LeadTime.ca.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

  • Mount the module on a 35 mm DIN rail with a minimum 72 mm contiguous space immediately adjacent to the LOGO! 8 base unit — module width is 71.5 mm and must align with the base unit's expansion connector
  • Connect a stable 24 V DC supply (20.4–28.8 V operating range) to the module power terminals — verify with a multimeter before energizing; AC input will damage the module
  • Wire the 8 digital input terminals to 24 V DC sensor signals (limit switches, proximity sensors, pushbuttons) with a common ground return to the module GND terminal
  • Wire relay output terminals to the corresponding load circuits; install an external fuse rated at or below 5 A in series with each relay output — the module has no built-in short-circuit protection
  • After physical installation, configure the LOGO! 8 program to recognize the expansion module I/O address space and test each input and output channel individually before commissioning the full machine

Switching Frequency and Load Limits: What the 2 Hz Rating Really Means

The 2 Hz ohmic and 0.5 Hz inductive switching frequency limits of the Siemens 6ED1055-1NB10-0BA2 are mechanical constraints of the relay contact, not software parameters. At 2 Hz ohmic, the relay completes one full on/off cycle every 500 ms — sufficient for motor starter coil activation, solenoid valve control, alarm annunciator switching, and conveyor motor on/off sequencing. At 0.5 Hz inductive, the relay requires two seconds per cycle because inductive loads generate back-EMF that delays contact release. The mechanical switching rate of 10 Hz applies only when no electrical load is connected — the contact can click at that rate with zero current, but the moment a load is connected, the rated electrical switching frequency governs.

What this means in practice: pulse-width modulation speed control, high-frequency output toggling, and any application requiring switching above 2 Hz requires a transistor-output expansion module. The 100 mA minimum load current specification is equally consequential — small indicator LEDs, logic-level signal inputs, or low-wattage devices drawing below 100 mA per output may not activate reliably. If any output load falls below this threshold, an external shunt or pull-up resistor must be added to that circuit during the design phase, not as a field fix after commissioning.

Short-Circuit Protection Gap and How to Close It

The Siemens 6ED1055-1NB10-0BA2 datasheet is explicit: short-circuit protection is not included. Every relay output circuit requires an external overcurrent protection device — a fuse or thermal circuit breaker rated at or below 5 A, installed in series with the load. For inductive loads, use a Type C industrial fuse to handle inrush current without nuisance tripping. For resistive loads, a Type B general-purpose fuse at the 5 A rating is appropriate. The 24 V DC supply feeding the module should also be protected with an appropriately sized device sized for the combined current draw of the module and any other devices on the same supply rail. Routing relay output wiring in separate conduit from input signal wiring reduces the risk of capacitive coupling from high-current switched circuits back into the input channel wiring.

Wrong-Part Prevention Checklist Before You Order

Before submitting a purchase order for the Siemens 6ED1055-1NB10-0BA2, confirm every item on this checklist against your application requirements:

  1. Verify LOGO! 8 base unit is installed first — module requires LOGO! 8 host (not compatible with LOGO! 5 or 7)
  2. Confirm power supply provides stable 24V DC — no AC input support on this variant
  3. Check available DIN rail space (module width = 71.5mm, requires 4 spacing units = 72mm minimum clearance)
  4. Confirm relay output load type matches nameplate rating (5A max ohmic, 3A max inductive per relay contact)
  5. Verify external circuit protection — module has no integrated short-circuit protection; external overcurrent device required
  6. Check control voltage loop isolation — floating contacts assume proper grounding scheme in end circuit
  7. Confirm operating temperature range (-20 to 55°C depending on version; older units 0-55°C) matches environment
  8. Validate lead contact requirement (8DI, 8DO) against application; ensure all I/O points will be used to avoid cost overspend

If any item on this checklist raises a compatibility question, contact the LeadTime.ca team before ordering — we can confirm compatibility and source the correct variant for your application.

Frequently Asked Questions

Can the Siemens 6ED1055-1NB10-0BA2 be used with a LOGO! 7 or LOGO! 5 base unit?

No. The 6ED1055-1NB10-0BA2 is designed exclusively for the LOGO! 8 base unit. It will not physically connect or functionally operate with LOGO! 5 or LOGO! 7 base units. Always confirm the installed base unit version before ordering this expansion module.

What happens if a relay output load draws less than 100 mA?

The relay contact may not switch reliably below the 100 mA minimum load current threshold. The relay will click mechanically, but the output current may be insufficient to activate the connected device. Adding an external shunt resistor or pull-up resistor to bring the total load current above 100 mA resolves this — size and verify the resistor on the bench before field installation.

Does the module need its own dedicated 24 V DC power supply, or can it share with the LOGO! 8 base unit?

The module can share a 24 V DC supply with the LOGO! 8 base unit if the supply is sized for the combined current draw of both units plus all connected loads. Verify the total current budget against your power supply rating before sharing. If the combined load approaches or exceeds the supply capacity, a dedicated supply for the expansion module is the correct approach.

Is external fusing required on every relay output circuit, or only on the supply?

The 6ED1055-1NB10-0BA2 has no built-in short-circuit protection on any relay output channel. External overcurrent protection rated at or below 5 A must be installed in series with each relay output load circuit. Supply-level protection alone is not sufficient — a fault on one output circuit could damage the module before a supply-level fuse responds.

What is the difference between the standard operating temperature rating and the ES03 version rating?

The standard version of this module is rated for 0 to 55°C operation. The ES03 version and later production batches carry an extended lower limit of -20 to 55°C, which is relevant for outdoor enclosures, unheated buildings, or cold-storage facility installations. Confirm the version designation on the product label or order documentation if your application operates below 0°C.

How many expansion modules can be connected to a single LOGO! 8 base unit?

The brief specifies that the 6ED1055-1NB10-0BA2 provides 4 MW (module widths) of expansion capacity for LOGO! 8. The maximum number of expansion modules supported by a given LOGO! 8 base unit depends on the specific base unit model and its total expansion capacity — consult the LOGO! 8 base unit documentation to confirm the maximum number of modules supported in your configuration.

Why Order the Siemens 6ED1055-1NB10-0BA2 from LeadTime.ca

  • Global shipping — LeadTime.ca sources and ships the Siemens 6ED1055-1NB10-0BA2 to customers worldwide, not limited to any single region
  • Real-time availability — contact the team directly for current stock status and confirmed lead times before committing to a build schedule
  • Volume pricing — orders for multiple units or bundled LOGO! 8 accessories are eligible for volume pricing; contact for a quote
  • Hard-to-source parts — LeadTime.ca specializes in locating automation parts that are difficult to find through standard distribution channels

At-a-Glance Summary

  • Model: Siemens 6ED1055-1NB10-0BA2 — LOGO! DM16 24R expansion module for LOGO! 8 only
  • I/O count: 8 digital inputs (24 V DC) and 8 floating relay outputs (5 A ohmic / 3 A inductive per contact)
  • Power supply: 24 V DC, operating range 20.4–28.8 V DC — no AC input support
  • Switching frequency limits: 2 Hz ohmic, 0.5 Hz inductive, 10 Hz mechanical (no load)
  • Minimum relay output load current: 100 mA — loads below this may not activate reliably
  • Dimensions: 71.5 x 90 x 58 mm, 4 spacing units on 35 mm DIN rail
  • Operating temperature: 0–55°C standard; -20–55°C for ES03 version and later
  • Protection class: IP20 — panel-mounted indoor installation
  • Short-circuit protection: none built in — external overcurrent device required on every relay output circuit
  • Certifications: CE, UL, CSA, FM, IEC 61131, VDE 0631 — suitable for North American, European, and international OEM applications
  • Compatible base unit: LOGO! 8 exclusively — not compatible with LOGO! 5 or LOGO! 7