Siemens 6ED1055-1FB00-0BA2 Expansion Module

Full Name: LOGO! DM8 230R Digital I/O Expansion Module (LOGO! 8 Series)

1. Model Code Interpretation

6ED1055-1FB00-0BA2

6ED1055: Prefix for LOGO! 8 series expansion modules

1FB: DM8 230R, 115/230 V AC/DC power supply, 4DI/4DO relay output

00: Hardware version

0BA2: Firmware version (LOGO!8 platform, incompatible with LOGO!6/7 (0BA6/0BA7) main units)

2. Core Electrical Specifications

3. Compatibility Instructions

✅ Supported Main Units: LOGO! 8 / 8.2 / 8.3 (0BA8 and later firmware)

Typical main unit models: 6ED1052-1FB08-0BA0, 6ED1052-1FB08-0BA1 and other 230 V main units

❌ Not Supported: LOGO! 6, LOGO!7 (0BA6/0BA7) main units. Backplane bus protocol differs, communication not available

4. Terminal Definition (Top: Power & Input; Bottom: Output)

Upper Terminals (Power Supply + Input)

L1, N: Module operating power supply

I1, I2, I3, I4: 4 digital inputs

Lower Terminals (Relay Output)

Q1, Q2, Q3, Q4: 4 independent relay normally-open contact groups (2 terminals per channel, no common terminal)

⚠️ Important: Four relays are electrically isolated; different voltage circuits can be connected to each channel independently

5. Typical Application Scenarios

Small HVAC control, water pump & fan control, lighting circuits, door interlock, simple conveyor lines. Ideal for sites equipped with existing 220 V AC sensors and contactor circuits without additional DC power supply.

6. Selection Guidelines & Common Pitfalls
7. Input signal must exceed 79 V to be reliably recognized as logic 1; low voltage signals cannot be used.
8. Relay mechanical contacts not suitable for high-frequency switching. Select transistor output modules for frequent operation.
9. Maximum expansion limit: A single LOGO! main unit can connect up to 4 expansion modules.
10. All input channels are recommended to use the same phase power. Do not connect I1~I4 across different phases to avoid false triggering caused by induced voltage.
11. Install RC snubbers or freewheeling diodes in parallel with inductive loads (contactors, solenoid valves) to extend relay service life.
12. Comparison with Similar Series Models

6ED1055-1FB10-0BA2 (DM16 230R): 8DI+8DO relay version with doubled I/O capacity

6ED1055-1HB00-0BA2 (DM8 24R): 24 V DC powered version

Complete Technical Documentation for Siemens 6ED1055-1FB00-0BA2 (LOGO! DM8 230R)

1. Basic Product Information

Order No.: 6ED1055-1FB00-0BA2

Product Name: LOGO! DM8 230R Digital Expansion Module (LOGO!8 Series)

Function: 4DI / 4DO relay output expansion module

Positioning: Extend I/O capacity for LOGO!8/8.2/8.3 main units, cannot run standalone

2. Full Model Code Interpretation

6ED1055 1FB00 0BA2

1. 6ED1055: LOGO! 8 series expansion module category
2. 1FB: DM8 230R, 115~230 V AC/DC power supply, 4-channel AC input, 4 independent normally-open relay outputs
3. 00: Hardware revision
4. 0BA2: Firmware version (LOGO!8 platform, incompatible with LOGO!6/7 (0BA6/0BA7) controllers)
5. Detailed Electrical Specifications

3.1 Power Supply

3.2 Digital Input DI (I1, I2, I3, I4)

Quantity: 4-channel universal AC/DC input

Logic 0: ＜40 V AC / ＜30 V DC

Logic 1: ＞79 V AC / ＞79 V DC

Input response delay: 0→1: 40 ms; 1→0: 75 ms

Input type: Passive AC voltage input, 24 V DC signals are not allowed

Maximum cable length: 100 m (unshielded cable)

3.3 Relay Output DO (Q1~Q4, isolated normally-open contacts)

⚠️ Four relays are mutually isolated; different voltage circuits can be wired to each channel

|Load Type|Contact Rating|

| —| —|

|Resistive Load (Resistors, Lighting)|5 A / 250 V AC|

|Inductive Load (Contactors, Solenoid Valves)|3 A / 250 V AC|

|Minimum Carry Current|100 mA (Poor contact performance may occur below this value)|

|Max Switching Frequency|Resistive load: 2 Hz; Inductive load: 0.5 Hz; Mechanical no-load limit:10 Hz|

|Prohibited Operation|Parallel connection of multiple output contacts for current boosting is forbidden|

4. Mechanical & Environmental Parameters

Mounting: 35 mm standard DIN rail

Width: 2 TE (35.5 mm)

Overall Dimensions: W35.5 × H90 × D58 mm

Weight: Approx. 170 g

Protection Class: IP20 (indoor cabinet use only)

Operating Temperature: -20 ℃ ~ +55 ℃ (condensation prohibited)

Storage & Transport Temperature: -40 ℃ ~ +70 ℃

Relative Humidity: 5% ~ 95%, no condensation

Vibration Resistance: Complies with IEC 60068-2-6

5. Terminal Definition

Upper Terminals (Power Supply + Input)

L1, N: Module operating power supply 115~230 V AC/DC

I1, I2, I3, I4: 4 digital inputs

Lower Terminals (Relay Output)

Q1 two terminals: 1st relay normally-open contact

Q2 two terminals: 2nd relay normally-open contact

Q3 two terminals: 3rd relay normally-open contact

Q4 two terminals: 4th relay normally-open contact

6. System Compatibility Rules

✅ Supported Main Units (LOGO!8 Platform)

6ED1052-1FB08-0BA0, 6ED1052-1FB08-0BA1, all LOGO!8.2 / 8.3 230 V controllers

Maximum expansion quantity: Up to 4 expansion modules per LOGO! main unit

❌ Incompatible Equipment

LOGO!6 (0BA6), LOGO!7 (0BA7) legacy controllers. Backplane communication protocol mismatch, cannot be recognized.

7. Software Configuration Requirements

Programming Software: LOGO! Soft Comfort V8.0 or higher

1. Select corresponding expansion module model in project hardware catalog;
2. I/O addresses of expansion modules automatically follow main unit addresses, no manual assignment required;
3. Verify hardware list before program download to avoid errors caused by version mismatch.
4. Certifications

CE, UL, CSA, CQC; Complies with EN 61010-1, EN 55011 (EMC Class B, applicable for commercial building environments)

9. Engineering Implementation Guidelines (Official Specifications)
10. RC snubbers must be connected in parallel with inductive loads (solenoid valves, contactor coils) for AC circuits to extend relay lifespan.
11. All input channels are recommended to adopt power supply from the same phase. Do not connect input terminals across different phases to prevent false triggering induced by stray voltage.
12. Mechanical relay contacts have limited service life. Select transistor output modules (DM8 24T) for high-frequency start-stop applications.
13. The module must be installed horizontally; vertical inverted installation is prohibited.
14. Maintain heat dissipation clearance in control cabinets to avoid heat accumulation when multiple modules are mounted side by side.
15. Comparison Table of Similar Models

Engineering Application Cases for Siemens 6ED1055-1FB00-0BA2 (LOGO! DM8 230R)

Core Advantages: Direct acquisition of 115~230 V AC/DC signals; isolated relay contacts directly drive 220 V loads without additional DC power supply. Matched with LOGO! 230RCE main unit (6ED1052-1FB08-0BAx). Suitable for new construction and retrofit projects with fully AC control circuits on site.

I/O Allocation: 4DI (220 V AC input) + 4 independent normally-open relay outputs

Case 1: Dual Sewage Pump Automatic Alternation Control for Basement Sump (Building Water Supply & Drainage)

1. Project Requirements

Two 220 V sewage pumps for underground parking sump; high/low level float switches with 220 V contact signals.

High water level: Start pumps; ultra-high level: Dual pumps run simultaneously + audible & visual alarm;

Low water level: All pumps stop;

Automatic timing alternation between main/standby pumps for uniform wear; Manual/Auto switching and fault feedback function.

2. Hardware Configuration

Main Unit: 6ED1052-1FB08-0BA1 (LOGO! 230RCE, onboard 8DI/4DO)

Expansion Module: 6ED1055-1FB00-0BA2 ×1 (DM8 230R)

3. I/O Assignment

Onboard Channels of Main Unit

I1: Auto/Manual Switch; I2: Manual Start Pump 1; I3: Manual Start Pump 2; I4: Emergency Stop;

Q1: Contactor of Pump 1; Q2: Contactor of Pump 2;

Expansion Channels of DM8 230R

I5 (Module I1): Low Level Float Switch; I6 (Module I2): High Level Float Switch; I7 (Module I3): Ultra-High Level Float Switch; I8 (Module I4): Spare;

Q5 (Module Q1): Ultra-high level alarm buzzer; Q6 (Module Q2): Fault indicator light; Q7, Q8: Spare

4. Solution Highlights

Float switches connect directly to module 220 V inputs without intermediate relays. Four isolated relay contacts can drive alarms and indicator lights separately with independent power circuits. No extra DC24V power supply required inside control cabinet, simplifying wiring.

Case 2: Fresh Air & Exhaust Fan Interlock Control for Office Building (HVAC)

1. Project Requirements

Four 220 V fresh air/exhaust fans with scheduled operation, temperature linkage, fan running feedback and fault alarm. Main unit onboard I/O insufficient, expanded by additional module.

2. Hardware List

LOGO! 230RCE Main Unit + 6ED1055-1FB00-0BA2 ×1

3. Module Utilization

DI Channels: 4-channel contactor running feedback signals (220 V);

DO Channels: Control contactors for extra two exhaust fans, fault audible & visual alarm, system running indicator light.

4. Engineering Features

All control signals are 220 V AC; isolated relay contacts allow different phase power feeding. Compact 2TE width saves DIN rail space for wall-mounted small control cabinets.

Case 3: Timed Group Control of Plant Lighting (Building Lighting System)

1. Requirements

Multiple groups of 220 V lighting circuits for plant road and perimeter lighting; Time-based staged switching via internal real-time clock; Local manual pushbutton override; Fault status feedback.

2. Hardware Configuration

LOGO! 230RCE (Built-in Real-Time Clock) + DM8 230R (6ED1055-1FB00-0BA2)

3. Module I/O Assignment

DI: 4-channel local manual pushbuttons (220 V signal);

DO: Drive AC contactor coils for 4 lighting groups.

4. Selection Reason

Module relay supports maximum 5 A resistive load, capable of directly driving small contactors. Lighting circuits are electrically isolated; single circuit failure will not affect others.

Case 4: Simple Automatic Transfer Switch for Dual Power Supply of Small Pump Station

1. Process Requirements

Two 220 V control power sources (main + standby). Automatically switch to standby power upon main power failure; interlock to prevent parallel operation; status indication and fault alarm available.

2. Hardware Configuration

LOGO! 230RC Main Unit + 6ED1055-1FB00-0BA2

3. I/O Assignment

Expansion DI: Dual power supply voltage detection feedback signals;

Expansion DO: Control closing coils of two circuit breakers and switching completion indicator.

This configuration is widely adopted in power distribution renovation projects and listed as official typical application by Siemens.

Case 5: Greenhouse Evaporative Cooling Fan & Spray Solenoid Valve Interlock Control (Agricultural Automation)

Requirements

Automatically activate cooling fans and spray solenoid valves when temperature & humidity exceed threshold; delay shutdown; local manual buttons and equipment fault feedback.

Hardware

LOGO! 230RCE + DM8 230R

Expansion DI: Manual pushbuttons, thermal relay fault feedback of fans;

Expansion DO: 220 V spray solenoid valve, standby fan contactor.

Notice

Solenoid valves belong to inductive loads. Install AC RC snubbers in parallel with relay outputs to extend relay operating life.

Case 6: Safety Gate, Conveyor and Warning Light Interlock for Light-Duty Conveying Equipment (OEM Machinery)

Control Logic

Conveyor allowed to start only when safety guard gate is closed; conveyor stops immediately once gate opens; warning light stays on and buzzer sounds intermittently during operation; emergency stop has highest priority.

Hardware Configuration

LOGO! main unit I/O capacity insufficient, expanded via 6ED1055-1FB00-0BA2:

DI: Safety door limit switch, emergency stop, reset button;

DO: Conveyor contactor, audible & visual alarm.

General Engineering Mandatory Specifications for All Cases

1. ✅ Input Wiring Rule: All 4 DI channels must be powered by the same phase L + N. Do not wire I1~I4 across different live phases to avoid false triggering caused by induced voltage.
2. ✅ Relay outputs are isolated normally-open contacts; different voltage circuits can be wired to each channel.
3. ✅ Snubber components are mandatory for inductive loads (contactors, solenoid valves).
4. ✅ Maximum 4 expansion modules can be cascaded with one LOGO! main unit.
5. ✅ Only compatible with LOGO!8 / 8.2 / 8.3 main units (0BA8 firmware). LOGO!7 and earlier versions are not supported.
6. ✅ Cannot operate independently; must be stacked on the right side of LOGO! main unit via expansion bus.