Siemens ed1052-1md08-0ba0

By Abdullah Zahid
13 min read
Siemens 6ED1052-1MD08-0BA0 LOGO! 12/24RCE logic module with integrated display mounted on DIN rail in industrial control panel

Siemens 6ED1052-1MD08-0BA0 LOGO! 12/24RCE Logic Module with Display — Specifications, Pricing and Buyer's Guide

Controls engineers searching for the Siemens 6ED1052-1MD08-0BA0 are typically at the final stage of a sourcing decision: they have confirmed the LOGO! product line fits their application, and now need to verify whether this specific SKU — the LOGO! 12/24RCE Logic Module with Display — is still available, priced correctly, and genuinely the right choice over its successors. This module delivers 8 digital inputs (4 analog-capable), 4 relay outputs, an integrated 24-character 2-line LCD display, and a 10 Mbps RJ45 Ethernet port — all in a 71.5 mm wide DIN-35 rail footprint that fits constrained control cabinets. One important note before you proceed: this product is discontinued, and successor models 0BA1 and 0BA8 are the recommended paths for new projects.

If you have already confirmed this is the right part and are looking for current stock, check current pricing and availability at LeadTime.ca — we ship worldwide.

Who Should Buy the 6ED1052-1MD08-0BA0 — and Who Shouldn't

The Siemens 6ED1052-1MD08-0BA0 is the right choice if all of the following apply to your application:

  • Your power supply is 12 VDC or 24 VDC — this module does not operate on 110/220 VAC alone
  • Your I/O count fits within 8 digital inputs (with up to 4 channels configurable as 0–10 V or 0–20 mA analog) and 4 relay outputs
  • Your control cabinet DIN rail has 71.5 mm of horizontal space available for the module body
  • Your application requires Ethernet connectivity — this 0BA0 variant includes an RJ45 port with integrated web server
  • Your logic complexity fits within 400 program blocks (equivalent to approximately 500–600 ladder rungs)
  • You need an integrated display for on-site diagnostics without purchasing a separate HMI panel

If you are specifying this for a new project rather than a direct replacement, the active successor 6ED1052-1MD08-0BA1 (0BA1) or the newest 6ED1052-1MD08-0BA8 (0BA8) are the stronger choices — both are in active production with extended firmware support, while the 0BA0 is discontinued with dwindling new-old-stock inventory.

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What the LOGO! 12/24RCE Actually Does in a Control System

The 6ED1052-1MD08-0BA0 is a standalone compact logic module — Siemens' terminology for a small PLC designed to replace hardwired relay logic without requiring the infrastructure of a full programmable controller like the S7-1200. In practice, it takes the place of time-delay relays, selector switches, and hardwired interlocks in a 24 VDC panel, and gives the engineer a programmable, modifiable logic layer with 400 program blocks of memory and an integrated display for on-site diagnostics.

The integrated 24-character 2-line LCD display is the defining hardware difference between this module and lower-cost LOGO! variants. It shows live parameter values, timer states, counter counts, and error codes directly on the module face — eliminating the need for a separate HMI touchscreen on applications where full graphical visualization is not required. The relay outputs carry up to 250 VAC at approximately 5–10 A contact rating, making them suitable for direct switching of motor starters, solenoid valves, and contactor coils within that load range.

The 10 Mbps RJ45 Ethernet port with integrated web server enables remote visibility into live I/O status and parameter values via a standard browser — a meaningful capability for retrofit projects where adding a full SCADA layer is not cost-justified. Data logging to a microSD card (supplied separately) adds timestamped event storage for cycle counts, runtime hours, and fault events.

Typical System Architecture for the 6ED1052-1MD08-0BA0

The 6ED1052-1MD08-0BA0 sits at the logic processing layer between field devices and upstream supervisory or monitoring systems, handling all sequencing and interlock decisions locally.

  • Field sensors and actuators (push buttons, limit switches, analog transducers, solenoid valves, motor starters) connect directly to the module's screw terminal blocks on inputs I1–I8 and relay output pairs
  • The 6ED1052-1MD08-0BA0 processes all program logic locally using its 400-block memory — no external processor or communication dependency during normal operation
  • Optional LOGO! expansion I/O modules attach directly to the right side of the base unit, extending the digital or analog channel count without replacing the base module
  • The RJ45 Ethernet port connects to the plant network or edge gateway, enabling browser-based monitoring via the integrated web server or data logging to microSD card
  • Upstream supervisory systems (HMI panels, SCADA, cloud historian) receive data via the Ethernet link; the display on the module face provides local operator access independent of network status

Applications Where This Module Earns Its Place

Relay panel retrofit projects are the most common deployment scenario for the 6ED1052-1MD08-0BA0. A typical 24 VDC panel with 8 field sensors and 4 motor starters maps directly to the module's 8 DI and 4 DO relay count, allowing the existing field wiring to stay in place while the hardwired logic is replaced with programmable, modifiable control logic. Troubleshooting time drops significantly because program changes no longer require rewiring.

Standalone pump and compressor control is another strong fit. The 4 analog-capable input channels accept 0–10 V or 0–20 mA signals from pressure or temperature transducers, allowing the module to sequence start/stop logic and manage interlocks based on real process feedback — without external signal conditioners for standard analog ranges.

Small conveyor and material handling lines benefit from the module's chain logic capability: sensor-triggered gate sequences, emergency stop integration, and manual override logic all fit comfortably within 400 program blocks for single-zone applications. The integrated display shows the operator the current state without requiring a separate HMI investment.

Building automation applications — including boiler sequencing, HVAC on/off control, and parking lot lighting with time-of-day scheduling via NTP time server over Ethernet — are well within the module's capability. The Ethernet web server makes it straightforward to monitor setpoints and alarm states remotely without commissioning a dedicated SCADA connection.

OEM equipment builders use this module when they need an integrated operator interface (cycle count, runtime hours, fault flags) without the cost or panel space of a touchscreen HMI. The 71.5 mm width keeps the cabinet door profile minimal.

Application Typical Deployment
Relay panel retrofit Replace hardwired interlocks and time-delay relays in 24 VDC panel; reuse existing field wiring on 8 DI / 4 DO
Pump / blower sequence control Start/stop logic with pressure or temperature interlock via analog input channels
Small conveyor / material handling Sensor-triggered gate sequence with emergency stop and manual override logic
Building automation (HVAC, lighting) Boiler on/off sequencing, time-of-day lighting control via NTP-synced Ethernet
OEM equipment control Integrated display shows cycle count, runtime, and fault flags without separate HMI cost
Remote condition monitoring retrofit Ethernet link to edge gateway or cloud historian; web server for supervisor dashboard visibility

Key Specifications Engineers Need Before Ordering

Parameter Specification
Power Supply Voltage 12 VDC / 24 VDC (±10%)
Digital Inputs 8 (4 channels configurable as analog 0–10 V or 0–20 mA, 8-bit resolution)
Relay Outputs 4 (NO/NC relay contacts, approximately 5–10 A at 250 VAC)
Program Memory 400 blocks (approximately 500–600 ladder rungs)
Retentive Data Memory 64 digital flags (M-flags), 64 analog flags
Display 24-character 2-line LCD with backlight control
Ethernet 10 Mbps RJ45, DHCP or static IP, integrated web server
Dimensions (W × H × D) 71.5 mm × 90 mm × 60 mm
Operating Temperature 0–50°C
IP Rating IP20 (enclosure required for washdown environments)

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

6ED1052-1MD08-0BA0 vs. 0BA1 vs. 0BA8 — Which One Do You Actually Need?

Feature 6ED1052-1MD08-0BA0 6ED1052-1MD08-0BA1 6ED1052-1MD08-0BA8
Product Status Discontinued Active — recommended Active — newest
I/O Count 8 DI (4 AI) / 4 DO relay 8 DI (4 AI) / 4 DO relay 8 DI (4 AI) / 4 DO relay
Integrated Display 24-char 2-line LCD 24-char 2-line LCD 24-char 2-line LCD
Ethernet 10 Mbps RJ45 10 Mbps RJ45 10 Mbps RJ45
Width 71.5 mm 71.5 mm 71.5 mm
Firmware Support End of support approaching Extended support through 2028+ Longest support horizon
Dual Color Status LEDs No No Yes
Advanced Diagnostics Menu Standard Standard Enhanced
Recommended For Direct replacement / legacy retrofit New projects requiring identical I/O New projects requiring latest features

For direct replacement of an existing 0BA0 installation, the 6ED1052-1MD08-0BA0 remains a valid choice if new-old-stock is available. For any new project build, the 6ED1052-1MD08-0BA1 or 6ED1052-1MD08-0BA8 are the correct specifications — check current availability at LeadTime.ca and our team can confirm which variant ships fastest from current inventory.

Expert Verdict: Honest Assessment for Purchase Decision

The 6ED1052-1MD08-0BA0 earned its reputation as a practical workhorse in small automation applications precisely because the hardware combination — 8 inputs, 4 relay outputs, integrated display, Ethernet, and 400-block memory — covers the majority of retrofit and standalone machine control scenarios without requiring a full PLC platform investment. The integrated display is a genuine differentiator: seeing live timer values, flag states, and error codes on the module face without pulling out a laptop or navigating to a remote HMI panel saves real diagnostic time in production environments. The modular expansion capability means the base unit does not become obsolete the moment an application adds a few more sensors.

The honest limitation is the discontinuation status. New-old-stock inventory is finite and typically priced between USD 170 and USD 200 per unit depending on condition, while refurbished units offer 30–40% cost savings at the trade-off of a shorter warranty (typically 6–12 months versus 1–2 years for new-old-stock). If your application is a direct swap for an existing 0BA0 unit in a running installation — same wiring, same program, same cabinet — the 0BA0 sourcing path makes sense. If you are designing a new system and the LOGO! platform meets your I/O and memory requirements, start with the 0BA1 or 0BA8 instead. The 400-block memory ceiling is also a real constraint: applications that grow beyond simple sequencing and conditional logic will encounter it, at which point the S7-1200 with its modular I/O and Profinet native communication becomes the appropriate next step.

For procurement teams, the key variable is lead time. New-old-stock of the 0BA0 typically runs 2–6 weeks depending on distributor inventory levels; refurbished units are generally available in 1–2 weeks. The active successor models 0BA1 and 0BA8 carry standard 1–3 week lead times as in-production parts. LeadTime.ca maintains sourcing access to both new-old-stock and successor variants — if you are working against a project schedule, view current stock and pricing at LeadTime.ca to confirm what ships soonest.

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

The following points cover the critical requirements for a correct installation. Engineers needing full wiring diagrams and step-by-step procedures should refer to the Siemens LOGO! 8 System Manual available on the Siemens Industry Support portal.

  • Power supply: Connect 12 VDC or 24 VDC (within ±10% of nominal) to the designated +/− terminals on the base module; an external circuit breaker or fuse is mandatory — the module has no integrated overcurrent protection
  • Digital inputs: Field sensors and switches connect to screw terminals labeled I1–I8; confirm sensor output voltage meets the minimum threshold for reliable detection at the module's 24 VDC nominal input rating
  • Analog inputs: Channels I1–I4 can be configured for 0–10 V or 0–20 mA analog signals at 8-bit resolution; select input type via program configuration, not hardware jumpers
  • Relay outputs: Four NO/NC relay contact pairs connect to screw terminal blocks; relay contacts are rated at approximately 5–10 A at 250 VAC — add flyback diodes and RC snubber networks across inductive loads (motor coils, solenoid valves) to protect contacts and extend relay lifespan beyond the typical 100,000-cycle rating
  • Ethernet: Insert a standard RJ45 patch cable; default network configuration is DHCP — static IP assignment is available via the module's display menu or LOGO! Soft Comfort V8 software; the integrated web server listens on port 80 (HTTP) by default on the 0BA0 variant

Compatible I/O Expansion and System Accessories

The 6ED1052-1MD08-0BA0 supports modular expansion by attaching LOGO! expansion I/O modules directly to the right side of the base unit, increasing input and output count without replacing the base module. Additional accessories support programming, data storage, and communication tasks.

  • LOGO! Digital Input Expansion Modules — add additional 24 VDC digital input channels beyond the base 8 DI
  • LOGO! Digital Output Expansion Modules — add relay or transistor output channels beyond the base 4 DO
  • LOGO! Analog Input Expansion Modules — add 0–10 V or 0–20 mA analog channels with 8-bit resolution beyond the 4 analog-capable base inputs
  • microSD Card — required separately for data logging of timestamped events (cycle counts, runtime hours, fault events) to external storage
  • LOGO! Soft Comfort V8 — free programming software from Siemens supporting Windows, Linux, and macOS; used for program development, upload/download via USB or Ethernet, and simulation

Wrong-Part Prevention Checklist Before You Submit a PO

This checklist covers the five most common ordering errors for the 6ED1052-1MD08-0BA0. Verify each point against your application before placing an order.

  1. Verify power supply voltage: model explicitly supports 12/24 VDC; will not operate on 110/220 VAC alone
  2. Confirm I/O count sufficiency: 8 DI (4 analog-capable), 4 DO relay outputs; expansion modules required if more I/O needed
  3. Check display requirement: this 0BA0 variant includes integrated display; 0BA8 also has display; 0BA6 does not
  4. Validate Ethernet port presence: 0BA0 includes RJ45; do not confuse with earlier models without network capability
  5. Confirm mounting method: DIN-35 rail mounting only; no wall-mount or embedded versions of this SKU

If any of these points do not match your application, contact the LeadTime.ca team to identify the correct variant — we can cross-reference your requirements against available LOGO! 8 series SKUs and confirm stock before you commit to an order.

Frequently Asked Questions

Can the 6ED1052-1MD08-0BA0 be programmed without purchasing additional software?

LOGO! Soft Comfort V8 is available as a free download from the Siemens Industry Support portal and runs on Windows, Linux, and macOS. Programs can also be transferred via microSD card. No paid license is required for the base programming environment, though some advanced features may require a valid software version tied to the module generation.

Is the 6ED1052-1MD08-0BA0 a direct drop-in replacement when upgrading from an older LOGO! module?

Physical footprint (71.5 mm × 90 mm × 60 mm) and DIN-35 rail mounting are consistent across LOGO! 8 series variants, so the mechanical swap is straightforward. Program compatibility between 0BA0 and older LOGO! generations (such as 0BA6) requires verification in LOGO! Soft Comfort before loading — conversion is typically automatic but should be confirmed before deployment in a live system.

What happens to the program and flag values if power is lost?

The 6ED1052-1MD08-0BA0 includes onboard battery-backed retentive memory holding 64 digital flags (M-flags) and 64 analog flags. Typical battery lifespan is 5–10 years. If the battery depletes, retentive flag states and current counter values are lost on power cycle — a condition that can cause unexpected behavior in sequencing applications. Back up the program to microSD card or external file at commissioning and verify annually.

Does the 0BA0's Ethernet web server support HTTPS or only HTTP?

On the 0BA0 variant, the integrated web server listens on port 80 (HTTP) by default. HTTPS/TLS support is firmware-version dependent on this discontinued generation — verify the specific firmware revision loaded on your unit against the Siemens release notes. If HTTPS is a hard requirement for your network security policy, the 0BA8 with its updated firmware baseline is the safer choice.

What is the realistic lead time and pricing for the 6ED1052-1MD08-0BA0 today?

As a discontinued product, this module is sourced from new-old-stock or refurbished inventory. Typical distributor pricing as of early 2026 runs USD 170–200 per unit for new-old-stock, with refurbished units offering 30–40% cost savings. Lead times for new-old-stock are typically 2–6 weeks; refurbished units are generally available in 1–2 weeks. The active successor models (0BA1, 0BA8) carry standard 1–3 week lead times and are the lower-risk sourcing path for volume orders.

When does it make sense to move to the S7-1200 instead of the LOGO! 12/24RCE?

The 400-block program memory in the 6ED1052-1MD08-0BA0 accommodates approximately 500–600 ladder rungs — sufficient for most single-machine or single-zone sequencing applications. When logic complexity grows beyond that ceiling, when the application requires more than 8 digital inputs or 4 relay outputs with a high channel count, or when native Profinet, Modbus TCP, or OPC-UA communication is required, the S7-1200 with its modular I/O architecture and 30 kB program memory becomes the appropriate step-up platform.

Why Order From LeadTime.ca

  • Global shipping via DHL and UPS — no geographic restrictions on orders for the 6ED1052-1MD08-0BA0 or successor variants
  • Sourcing access to hard-to-find discontinued parts including new-old-stock and verified refurbished LOGO! 8 modules
  • Direct response from a technical team familiar with LOGO! 8 series variant differences — not a call center
  • Volume pricing available for multi-unit orders; confirm requirements before submitting a purchase order
  • Successor variant cross-referencing: if 0BA0 stock is unavailable, we confirm whether 0BA1 or 0BA8 ships faster for your timeline

At-a-Glance Summary

  • Model: Siemens 6ED1052-1MD08-0BA0 — LOGO! 12/24RCE Logic Module with Display
  • Product status: Discontinued; new-old-stock available; successors 0BA1 and 0BA8 are active production
  • Power supply: 12 VDC or 24 VDC (±10%); no integrated overcurrent protection — external fuse or breaker required
  • I/O: 8 digital inputs (4 configurable as 0–10 V or 0–20 mA analog, 8-bit resolution) and 4 relay outputs (~5–10 A at 250 VAC)
  • Program memory: 400 blocks (~500–600 ladder rungs); 64 digital and 64 analog retentive flags with battery backup
  • Display: 24-character 2-line LCD with backlight — eliminates need for separate HMI on simple applications
  • Ethernet: 10 Mbps RJ45 with DHCP or static IP; integrated web server on port 80 (HTTP); data logging via separate microSD card
  • Footprint: 71.5 mm × 90 mm × 60 mm; DIN-35 rail mounting only; IP20 rating requires panel enclosure
  • Pricing: USD 170–200 (new-old-stock); 30–40% savings on verified refurbished units
  • Lead time: 2–6 weeks new-old-stock; 1–2 weeks refurbished; 1–3 weeks for active successor models