Siemens 6BK1700-0BA20-0AA0 Communication Module

Series: Communication module for LOGO! 8 / 8.2

Name: CMK2000

Positioning: Connect LOGO! to KNX (EIB) building bus to realize logic linkage between building automation and LOGO!

Core Specifications

Power supply: DC24V (19.2~28.8V), rated current 0.04A, max. power consumption 1.1W

Interfaces:

1 × RJ45 Ethernet (100M) for web configuration, diagnosis and time synchronization

1 × KNX bus terminal (KNX/EIB, 9600 bit/s)

Communication objects: Up to 50 KNX communication objects, KNX clock synchronization supported

Mounting: DIN rail, 4TE (71.5 mm width)

Protection class: IP20

Operating temperature: 0 ~ +55℃

Weight: approx. 0.13~0.14 kg

Origin: Germany, product status: Active

Compatible Controllers

✅ LOGO! 8, LOGO! 8.2 (firmware version FS4 and above)

❌ Not compatible with older LOGO! 6 / 7

Typical Application Scenarios

Building automation, smart lighting, air conditioning fans, roller blind shading, energy consumption acquisition. LOGO! executes local logic, while CMK2000 acts as a gateway for two-way interaction with the KNX system. It can also be configured and commissioned directly via web pages, without writing all logic through dedicated KNX commissioning software.

Configuration Guidelines

1. Add CMK2000 in LOGO!Soft Comfort and define KNX objects (read/write)
2. Access the module IP via browser to set KNX parameters, group addresses and perform diagnostics on the web page
3. The KNX side can read and write LOGO! internal variables, markers, timers and analog values

Replacement & Compatibility Notes

No direct hardware replacement model; CMK2000 (6BK1700-0BA20-0AA0) is the only option for KNX connection of LOGO! 8 series

If KNX is not required and only Ethernet communication is needed, select LOGO! models with built-in Ethernet (PN variants marked 6ED1052)

Common Troubleshooting

KNX bus communication failure: Check KNX polarity, bus power supply and bus wiring; wire cross-section 0.6~1.0 mm²

Web page inaccessible: Confirm the PC is in the same network segment as LOGO! and wait for module startup completion after power-on

Communication objects not refreshed: Verify LOGO! firmware version and mapping direction (input/output) of group addresses

6BK1700-0BA20-0AA0｜LOGO! CMK2000 KNX Communication Module

Positioning: Dedicated KNX/EIB bus gateway for LOGO!8 / 8.2, enabling bidirectional data exchange between LOGO! logic controllers and the KNX building bus

1. Power Supply Parameters

Rated voltage: DC 24V

Permissible voltage range: DC 19.2V ~ 28.8V (SELV safety extra-low voltage)

Maximum current consumption: 0.04 A

Maximum power consumption: 1.1 W

2. Communication Interfaces
3. Ethernet Interface X1

Connector: RJ45

Speed: 100 Mbit/s, TCP/IP

Purpose: Web configuration, diagnosis, time synchronization, communication with LOGO! host

2. KNX/EIB Bus Terminal X2

Baud rate: 9600 bit/s

Recommended wire cross-section: 0.6 ~ 1.0 mm²

Bus: Standard KNX bus, KNX clock synchronization supported

Maximum communication objects: 50 KNX communication objects (bidirectional access to LOGO! digital inputs/outputs, markers, analog values and timers)

Built-in web server: Supports browser-based configuration and online diagnosis; S7 basic communication is not supported

3. Compatible Host Units

Supported: LOGO! 8, LOGO! 8.2 (firmware FS4 and above)

Not supported: LOGO! 6, LOGO! 7

4. Mechanical & Mounting

Mounting: 35 mm standard DIN rail

Dimensions (W × H × D): 71.5 mm × 90 mm × 58.5 mm (4TE)

Net weight: approx. 0.13~0.14 kg

Protection class: IP20 (for cabinet installation only)

5. Environmental Conditions

Operating temperature (horizontal mounting): 0 ℃ ~ +55 ℃

Storage / transport temperature: -40 ℃ ~ +70 ℃

Relative humidity: 10% ~ 95 %, non-condensing

Atmospheric pressure: 795 hPa ~ 1080 hPa

6. EMC & Certifications

Emission standards: EN 55011 Class B (suitable for residential areas), EN 61000-6-3

Certifications: CE, UL, cULus, CSA, RoHS

Product status: PLM PM300, Active, made in Germany

7. Indicators

RUN: Operation status

PT: KNX programming mode

KNX: KNX bus communication status

1. Full Model List of LOGO! CMK2000 (KNX Gateway)

CMK2000 has only one standard order number, no standard variants or SIPLUS extended temperature versions:

1. 6BK1700-0BA20-0AA0 (only available active model, PLM PM300)

Name: LOGO! CMK2000 KNX communication module

Power supply: DC24V; Interfaces: RJ45 Ethernet + KNX bus

Communication objects: up to 50; compatible with LOGO! 8 / 8.2 (firmware FS4 and above)

Important note:

The 6BK1700 prefix also covers another product line of SIPLUS HCS heating control modules (2BA suffix), not belonging to the LOGO! CMK2000 series, do not mix them up.

2. All 6BK1700 Prefix Models (Two Product Lines Separated)

Product Line 1: LOGO! CMK2000 (KNX communication module, 1 model only)

6BK1700-0BA20-0AA0 (LOGO! CMK2000, KNX gateway)

Product Line 2: SIPLUS HCS724I Heating Control System (Non-LOGO!, 2BA suffix)

1. 6BK1700-2BA00-0AA0
2. 6BK1700-2BA20-0AA0 (discontinued)
3. 6BK1700-2BA30-0AA0
4. 6BK1700-2BA70-0AA0
5. 6BK1700-2BA80-0AA0
6. 6BK1700-4BA50-0AA0
7. Other LOGO! Communication Modules for Reference
8. CMK2000 (KNX): 6BK1700-0BA20-0AA0
9. CMR2020 (GPRS): 6GK7142-7BX00-0AX0
10. CMR2040 (LTE/4G): 6GK7142-7EX00-0AX0
11. CSM12/24 (4-port switch): 6GK7177-1MA20-0AA0
12. CIM (Modbus TCP/RTU + cloud): Not covered by 6BK1700, order number series 6BK1701

LOGO! CMK2000 KNX module: only one available model 6BK1700-0BA20-0AA0, no sub-variants

All 6BK1700-2BAxx / 4BAxx are HCS heating system modules and not LOGO! communication modules.

Application Cases for 6BK1700-0BA20-0AA0 (CMK2000)

Core principle: LOGO!8/8.2 executes local logic, timing, threshold comparison and interlocking; CMK2000 works as a bidirectional gateway to connect KNX bus panels, actuators and sensors. Max. 50 KNX communication objects. ETS5/ETS6 is used for KNX side configuration, and LOGO!Soft Comfort for LOGO! programming and object mapping.

Case 1: KNX Astronomical Timer + Central Lighting Control (Siemens official sample ID:109745699)

Scenario: Office, corridor and public area lighting with automatic timing plus manual override via KNX panels

Hardware: LOGO!8 controller + CMK2000 + KNX 3-gang push-button panel + KNX lighting actuator

Functions:

1. LOGO! built-in astronomical timer (sunrise/sunset), weekly/yearly timer automatically sends ON/OFF commands to KNX actuators
2. Button signals from KNX panels are uploaded to LOGO! for forced switching and scene selection; panel LEDs receive status feedback from LOGO!
3. KNX bus provides time synchronization for LOGO!; time and status can be viewed on TDE text display and LOGO! built-in web page

Object allocation: approx. 8~12 KNX objects

Advantages: No KNX timers required. Leverage LOGO!’s flexible annual calendar and holiday disable logic for automatic lighting shutdown during holidays.

Case 2: Zoned Control for Multi-Room Movable Partition (Official sample ID:109748585)

Scenario: Conference room, multi-function hall, automatic lighting and air conditioning zoning when movable partitions are opened or closed

Hardware: LOGO!8 + CMK2000 + KNX panels, KNX dimming actuators, KNX damper actuators, partition position switches (LOGO! local DI)

Functions:

1. Partition position signals are sent to LOGO!; LOGO! judges whether the space is a single large hall or multiple independent rooms
2. Zone status is synchronized to KNX bus; when a scene is triggered on the KNX panel, LOGO! enables lighting and air conditioning according to zoning logic
3. Cross-zone interlock: When partitions are separated, the panel of zone A cannot control loads in zone B

Advantages: KNX only handles panels and actuators, while complex zoning interlocking logic runs in LOGO!, greatly simplifying ETS projects.

Case 3: Illuminance Threshold Dimming Control (Official sample ID:109748587)

Scenario: Daylight harvesting dimming for offices and exhibition halls

Hardware: LOGO!8 + CMK2000 + KNX light sensor, KNX 0-10V dimming actuator

Functions:

1. KNX illuminance value (0~255) is uploaded to LOGO! analog variable
2. Threshold comparison and hysteresis filtering are implemented in LOGO! to avoid frequent flickering
3. LOGO! sends dimming percentage to KNX dimmer; manual dimming via panel retains higher priority

Features: LOGO! performs filtering, limit protection and delay; KNX only transfers measured values and control values.

Case 4: HVAC Temperature / Humidity + CO₂ Ventilation Interlock (Fresh air for buildings or small server rooms)

Scenario: Small server rooms, laboratories, exhibition halls; interlock for fresh air fans, electric heating and dehumidification

Hardware: LOGO!8 + CMK2000 + KNX temperature/humidity/CO₂ sensors, KNX damper actuators, local contactor outputs on LOGO!

Functions:

1. KNX sensors upload temperature, RH and CO₂ concentration to LOGO!
2. LOGO! executes PID or threshold logic: increase fresh air when CO₂ exceeds limit, start heating at low temperature, activate dehumidification at high humidity
3. Operation status, fault signals and setpoints are sent back to KNX for display on central panels or touch screens

Fitment: LOGO! has native analog processing, delay and alarm functions; CMK2000 bridges KNX sensors and LOGO! logic.

Case 5: Gate / Garage Door Safety Interlock (Official sample ID:109748589)

Scenario: Underground garage roller shutter doors, access control and safety light curtain interlock

Hardware: LOGO!8 + CMK2000 + KNX access control panel, local safety light curtain DI, door motor contactor

Functions:

1. KNX access button sends opening authorization signal to LOGO!
2. LOGO! performs safety interlock: door opening permitted only when the light curtain is clear and limit switches are normal; auto-close after timeout
3. Door status, fault and lock status are fed back to KNX panel LED indicators

Value: Safety interlock logic runs locally in LOGO!; protection remains valid even if the KNX bus is offline.

Case 6: Peak Load Limiting (Energy management, proven overseas solution)

Scenario: Shops, apartment heating circuits, charging pile group power limitation

Hardware: LOGO!8.3+ firmware + CMK2000 + KNX energy meter gateway, multiple heating / charging pile contactors

Functions:

1. Real-time active power from KNX meter is uploaded to LOGO!
2. LOGO! implements priority sequencing for 8 loads; high-priority loads are retained and low-priority loads are shed when total power exceeds threshold
3. Shedding status and current power are sent back to KNX supervision system

Critical requirement: Firmware ≥ FS4, otherwise KNX object binding fails.

Case 7: Auxiliary Industrial Skid (HVAC control cabinets, water pumps, dust removal units integrated into building KNX)

Scenario: Factory auxiliary equipment, chiller units, exhaust fan cabinets; upload equipment status to the building KNX automation system

Hardware: LOGO!8 + CMK2000

Functions:

LOGO! collects pump run status, fault, hand-auto mode, temperature and pressure via local DI/AI

Status, alarms and setpoints are uploaded to KNX through CMK2000; start/stop and setpoints can be issued from KNX side

Advantages: LOGO! provides reliable local control for industrial equipment; expensive KNX IO modules are not required for interconnection between industrial control and building bus.

General Implementation Notes (Applicable to all cases)

1. Maximum communication objects: 50, bidirectional (KNX→LOGO / LOGO→KNX), mapped to LOGO! DI/DO, markers M, variables V and timers
2. Workflow for commissioning:

LOGO!Soft Comfort: Write logic, add CMK2000, define KNX objects and direction

CMK2000 web page: IP configuration, KNX parameters, diagnostics and online monitoring

ETS5/ETS6: KNX device database, group address binding and download to KNX bus devices

3. Bus accessories: Standard KNX bus power supply is mandatory; KNX cable J-Y(ST)Y 2×2×0.8, only red/black pair is used
4. Limitations: S7 protocol is not supported, only KNX TP1; communication with LOGO! runs over Ethernet, not backplane bus.

Selection Reference

For simple direct load control by KNX panels: CMK2000 is not needed

Where complex timing, astronomical clock, interlocking, filtering, local IO acquisition and offline protection are required: CMK2000 + LOGO! is a cost-effective solution.