SIEMENS RDF400BN Room Thermostat BACnet Modbus Instruction Manual

SIEMENS RDF400BN Room Thermostat BACnet Modbus

Specifications

• Product: Room thermostat BACnet/Modbus
• Models: RDF400BN, RDF440BN, RDF460BN
• Operating Modes: Comfort, Economy, Protection
• Communication Protocol: BACnet MS/TP or Modbus RTU Server
• Fan Output Options:
  • RDF400BN, RDF440BN
  • RDF440BN, RDF460BN
  • RDF400BN, RDF460BN
• Input Options: 2 multifunctional inputs for keycard, external sensor, etc.
• Mounting: Recessed square 86 mm conduit box with 60.3 mm fixing centers
• Operating Voltage:
  • RDF400BN, RDF460BN: Operating Voltage A
  • RDF440BN: Operating Voltage B

Product Usage Instructions

Room Temperature Control
The thermostat allows control of room temperature using the built-in sensor, external sensor, or bus temperature.

Operating Modes Selection
You can select between Comfort, Economy, and Protection modes via the operating mode button.

Fan Control
Configure automatic or manual fan speed control and choose fan output options accordingly.

Heating/Cooling Changeover
Switch between heating and cooling modes automatically or manually based on your preference.

Commissioning
Commission the thermostat using the local HMI, bus, or Siemens smartphone app Quick Config for easy setup.

Setpoints and Display
You can set minimum and maximum room temperature limits and configure various display settings.

FAQ

• How can I reset the thermostat to factory settings?
  To reset to factory settings, navigate to the setting menu and select the option to reload factory settings.

• Can I protect my parameters with a password?
  Yes, you can enable password protection for your parameters to enhance security.

Room thermostat BACnet/Modbus
RDF400BN, RDF440BN, RDF460BN

For 2-pipe, 2-pipe with electric heater and 4-pipe fan coil units

• Selectable bus communication protocol: BACnet MS/TP or Modbus RTU Server
• Slim design with touch button and frameless backlit display
• Fan output:
  • 1-speed and 3-speed fan (RDF400BN, RDF440BN)
  • DC 0…10 V fan (RDF440BN, RDF460BN)
• Control output:
  • 2-wire or 3-wire On/Off valve actuator (RDF400BN, RDF460BN)
  • 3-position valve actuator (RDF400BN, RDF460BN)
  • DC valve actuator (RDF440BN)
• 2 multifunctional inputs for keycard, external sensor, etc.
• Operating modes: Comfort, Economy and Protection
• Automatic or manual fan speed control
• Automatic or manual heating/cooling changeover
• Commissioning via local HMI, bus or Siemens smartphone app Quick Config
• Mounting on recessed square 86 mm conduit box with 60.3 mm fixing centers
• Operating voltage:
  • AC 100…230 V (RDF400BN, RDF460BN)
  • AC/DC 24 V (RDF440BN)

Use

The thermostat is designed for use with the following:

• Fan coil units with 1-/3-speed fan controlling (RDF400BN):
  • 2-pipe system, 2-wire On/Off valve actuator
  • 2-pipe system, 3-wire On/Off valve actuator
  • 2-pipe system, 3-position valve actuator
  • 2-pipe system with electric heater, 2-wire On/Off valve actuator
  • 4-pipe system, 2-wire On/Off valve actuator
• Fan coil units with 1-/3-speed or DC 0…10 V fan controlling (RDF440BN):
  • 2-pipe system, DC 0…10 V valve actuator
  • 4-pipe system, DC 0…10 V valve actuator and 1-/3-speed fan only
• Fan coil units with DC 0…10 V fan controlling (RDF460BN):
  • 2-pipe system, 2-wire On/Off valve actuator
  • 2-pipe system, 3-wire On/Off valve actuator
  • 2-pipe system, 3-position valve actuator
  • 2-pipe system with electric heater, 2-wire On/Off valve actuator
  • 4-pipe system, 2-wire On/Off valve actuator

Functions

General functions

• Room temperature control via built-in temperature sensor, external room temperature sensor or temperature from bus
• Selection of operating modes via operating mode button: Comfort or Economy
• Selection of automatic or manual fan mode
• Changeover between heating and cooling mode (automatic via local sensor or bus, or manually)
• Measured value adjustment of built-in or external temperature sensor
• Key lock function
• Configurable operating mode after power-up: Previous mode, Comfort or Protection
• Surge protection at power-up

Setpoints and display

• Min. and max. limitation of room temperature setpoint:
  • Comfort limitation (min. and max. limitation)
• Display of current room temperature or setpoint in ℃, ℉ or both
• Display of time of day from bus

Setting

• Setting of commissioning and control parameters via:
  • Local HMI
  • BACnet/Modbus commissioning tool
  • Siemens smartphone app Quick Config
• Reloading factory settings
• User settings and control parameters are retained in case of power failure
• Parameter protection by password (disabled by default)

Fan

• 1-speed, 3-speed or DC 0…10 V fan control
• Configurable fan kick in Economy
• Configurable fan start kick
• Configurable fan operation in zero energy zone (dead zone)
• Fan operating hours counter

Inputs

• 2 multifunctional inputs, X1 (for sensor/dry contact/DC 0…10 V) and D1 (for dry contact), selectable for:
  • External room temperature sensor
  • Sensor for automatic heating/cooling changeover
  • Switch for remote heating/cooling changeover
  • Window contact to switch operating mode to Protection
  • External alarm source for status reporting via bus
  • Presence detector to switch operating mode to Comfort
  • Hotel presence detector to switch operating mode to Economy and lock the screen when the room is unoccupied
  • DC 0…10 V feedback signal of modulating valve state (RDF440BN)

Communication

• Selectable communication protocol: BACnet MS/TP or Modbus RTU Server
• Central control of setpoints and operating mode from bus
• Monitoring of device status via bus
• Parameter read/write via bus
• Forced operating mode to Protection via bus

Mechanical design
The thermostat consists of two parts:

• Control unit with user interface and I/O module
• Mounting plate to fit onto a square conduit box with 60.3 mm fixing centers.

Operating and setting elements

Type summary

Product no.| Stock no.| Operating voltage| Control outputs| Fan types| Description
---|---|---|---|---|---
On/Off| 3-pos| DC 0…10 V| On/Off (3-wire)| 3-speed| DC 0…10 V
RDF400BN| S55770-T508| AC 100…230 V| ✓| ✓| –| ✓| ✓| –| Room thermostat BACnet/Modbus
RDF440BN| S55770-T509| AC/DC 24 V| –| –| ✓| –| ✓| ✓| Room thermostat BACnet/Modbus
RDF460BN| S55770-T510| AC 100…230 V| ✓| ✓| –| ✓| –| ✓| Room thermostat BACnet/Modbus

Ordering

When ordering, specify both product number / stock number and name: e.g. RDF400BN / S55770-T508 Room thermostat BACnet/Modbus
Order valve actuators and external sensors separately.

Equipment combinations

On/Off actuators (RDF400BN, RDF460BN)

3-positon actuators AC 230 V (RDF400BN, RDF460BN)

DC 0…10 V actuators  (RDF440BN)

*) All documents can be downloaded from http://siemens.com/bt/download.

• RDF400BN
• RDF440BN
• RDF460BN

|

• A6V13989826
• A6V12905642
• A6V14064629

Basic documentation| All| A6V14153583
CE declaration| All| A5W00725824A
RCM declaration| All| A5W00727514A
UKCA declaration| All| A5W00725826A
Environmental product declaration| All| A5W00718438A

Related documents such as environmental declarations, CE declarations, etc., can also be downloaded at the following Internet address:
www.siemens.com/bt/download

Notes

Security

CAUTION
National safety regulations
Failure to comply with national safety regulations may result in personal injury and property damage

• Observe any national provisions and comply with the appropriate safety regulations.

Mounting and installation

Mounting

• The device is suitable for mounting on a recessed square conduit box with 60.3 mm fixing centers.
• Recommended height: 1.5 m above the floor.
• Do not mount the devices in recesses, shelves, behind curtains or doors, or above or near heat sources.
• Avoid direct solar radiation and drafts.
• Avoid unheated (uncooled) building area such as outside walls.
• Seal the conduit box or the installation tube if any, as air currents can affect sensor readings.
• Adhere to allowed ambient conditions.

WARNING
Device damage
Carefully read all wiring diagrams prior to installation to avoid damage to the device caused by incorrect wiring of high or low voltages.

See Mounting Instructions A6V13989826 (RDF400BN), A6V12905642 (RDF440BN) or A6V14064629 (RDF460BN) enclosed with the thermostat.

Wiring

WARNING
Wire, protect and earth in compliance with local regulations. Risk of fire and injury due to short-circuits!

• Adapt the line diameters as per local regulations to the rated value of the installed overcurrent protection device.
• The power supply line (AC 100…230 V or AC 24 V) must have an external circuit breaker with a rated current of no more than 10 A.
• Disconnect from supply before removing the device from its mounting plate.
• Isolate the cables of all SELV terminals for AC 100…230 V, e.g., BACnet/Modbus communication input BN+, BN- and REF for AC 100…230 V.
• Nominal power of electrical heater needs to be lower than 0.8 kW, additional security element must be installed. (RDF400BN, RDF460BN)

Commissioning
After first power-up, all LCD segments light up for about 3 seconds. Afterwards, the device enters parameter setting mode and is ready for commissioning by qualified HVAC staff. When commissioning is finished and user exits parameter setting mode, the device restarts and is ready for normal operation.
The control parameters of device can be adjusted to ensure optimum performance of the entire system (see Control parameters in Basic documentation).

Applications and settings
The room thermostats are delivered with a fixed set of applications and related parameters. Select and activate the relevant application and settings during commissioning using one of the following tools:

• Local HMI
• BACnet/Modbus commissioning tool
• Siemens smartphone app Quick Config

Commissioning via smartphone application Quick Config
The setting via the smartphone application Quick Config is used to set the application and parameters settings of the thermostat.
This tool allows for wireless setting of the thermostat with smartphone and read/write parameters.
The commissioning tool works directly after users scan either the antenna area of the thermostat or the NFC area on the individual package box.

NOTICE! Before scanning, users need make sure smartphone NFC area to ensure communication between smartphone and thermostat.
In addition, users can:

• Scan the antenna area without powering on the thermostat.
• Scan the NFC area without unpacking the thermostat from the individual box.

Notes
The commissioning via smartphone application Quick Config can be disabled via parameters to avoid unexpected changes of the thermostat.

Control sequence
Set the control sequence via parameter P02 depending on the application. Factory setting:

Surge protection at power-up
When the thermostats are powered, the control outputs start at random to protect the electric system against overload. It takes up to 3 seconds for all thermostat outputs to function properly.

• Measured value adjustment
  The device has an internal sensor or external sensor connected via X1 for accurate temperature display. If the temperature reading is affected by the installation location, adjust the sensor via parameter P13 to correct the readings.

• Setpoint and range limitation
  For comfort and to save energy, we suggest to review all setpoint related parameters and adapt them as needed.

• MAC address (BACnet)
  The MAC address is assigned to “4” (factory setting). If necessary, engineer/installer can change the address value using the parameter P93.

• Device address (Modbus)
  The device address is assigned to “1” (factory setting). If necessary, engineer/installer can change the address value using the parameter P93.

• Baud rate
  The Baud rate is selectable. Five options, auto, 9600 bps, 19200 bps, 38400 bps and 76800 bps, are available for the BACnet network (38400 bps is default). Four options, auto, 9600 bps, 19200 bps and 38400 bps, are available for the Modbus network (19200 bps is default).

• Modbus data frame format
  Modbus data frame format can be set to 1 = 1/8/E/1, 2 = 1/8/O/1, 3 = 1/8/N/1 or 4 = 1/8/N/2 (1/8/E/1 is default).

Disposal
This symbol or any other national label indicate that the product, its packaging, and, where applicable, any batteries may not be disposed of as domestic waste. Delete all personal data and dispose of the item(s) at separate collection and recycling facilities in accordance with local and national legislation.
For additional details, refer to Siemens information on disposal.

Cyber security disclaimer
Siemens provides a portfolio of products, solutions, systems and services that includes security functions that support the secure operation of plants, systems, machines and networks. In the field of Building Technologies, this includes building automation and control, fire safety, security management as well as physical security systems. In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art security concept. Siemens’ portfolio only forms one element of such a concept.
You are responsible for preventing unauthorized access to your plants, systems, machines and networks which should only be connected to an enterprise network or the internet if and to the extent such a connection is necessary and only when appropriate security measures (e.g. firewalls and/or network segmentation) are in place. Additionally, Siemens’ guidance on appropriate security measures should be taken into account. For additional information, please contact your Siemens sales representative or visit:
https://www.siemens.com/global/en/products/automation/topic-areas/industrial- cybersecurity.html
Siemens’ portfolio undergoes continuous development to make it more secure. Siemens strongly recommends that updates are applied as soon as they are available and that the latest versions are used. Use of versions that are no longer supported, and failure to apply the latest updates may increase your exposure to cyber threats. Siemens strongly recommends to comply with security advisories on the latest security threats, patches and other related measures, published, among others, here:
https://www.siemens.com/cert/ => ‘Siemens Security Advisories’

Warranty

Technical data on specific applications are valid only together with Siemens products listed under “Equipment combinations”. Siemens rejects any and all warranties in the event that third-party products are used.

Technical data

Power supply (RDF400BN)

Operating voltage| AC 100…230 V
Frequency| 50/60 Hz
Power consumption| Max. 5 VA / 3 W
Standby power consumption| 1 VA / 0.5 W
No internal fuse!

External preliminary protection with max. C 10 A circuit breaker in the supply line required under all circumstances.

Power supply (RDF440BN)

Operating voltage| AC/DC 24 V
Power consumption| Max. 5 VA / 3 W
Standby power consumption| 1.2 VA / 0.5 W
External supply line protection (EU)| Circuit breaker max. 10 A
Characteristic B, C, D according to EN 60898
or
Power source with current limitation of max. 10 A
Power supply (RDF460BN)

Operating voltage| AC 100…230 V
Frequency| 50/60 Hz
Power consumption| Max. 5 VA / 3 W
Standby power consumption| 1 VA / 0.5 W
No internal fuse!
External preliminary protection with max. C 10 A circuit breaker in the supply line required under all circumstances.
BACnet interface

Type| RS485
Transmit mode| MSTP
Connection| Up to 60
Baud rate| Auto, 9600, 19200, 38400 (default), 76800
MAC address| 0…127, 4 (default)
Cable length| Max.1200 meters
Supported BACnet services| Read property-B, Read property multiple-B,
 | Write property-B, Write property multiple-B,
 | Who-is, Who-has, subscribe COV-B,
 | subscribe COVP-B, etc.
Modbus interface

Type| RS485
Transmit mode| RTU
Connection| Up to 32
Baud rate| Auto, 9600, 19200 (default), 38400
Device address| 1…127, 1 (default)
Cable length| Max.1200 meters
Identity| Server
Transmission format (start bit – data – parity| 1 = 1-8-E-1 (default) / 2 = 1-8-O-1 /
– stop)| 3 = 1-8-N-1 / 4 = 1-8-N-2
Near field communication

NFC| 13.56 MHz
Max. magnetic field strength| <42 dBμA/m@10 m (depending on the NFC reader)
Wiring connections (RDF400BN)

Diameter

Power, input, and output (L, N, Q1, Q2, Q3, Y1, Y2)
SELV signal (BN+, BN-, Ref, X1, M, D1)
Wire

| **** 1.0…1.5 mm2

**** 0.5…1.5 mm2

Solid or prepared stranded

Wiring connections (RDF440BN)

Diameter

Power, input, and output (L1, Q1, Q2, Q3) SELV signal (G, G0, M, Y10, Y20, BN+, BN-, Ref, X1, M, D1)

Wire

| ****

1.0…1.5 mm2

0.5…1.5 mm2

**** Solid or prepared stranded

Wiring connections (RDF460BN)

Diameter

Power, input, and output (L, N, Y1, Y2) SELV signal (BN+, BN-, Ref, X1, M, D1, M, Y50)

Wire

| ****

1.0…1.5 mm2

0.5…1.5 mm2

**** Solid or prepared stranded

Output

1-/3-speed fan (RDF400BN) Type

Voltage Maximum current

| Q1…Q3

On/Off

AC 100…230 V Min. 5(2) A

1-/3-speed fan (RDF440BN) Type

Voltage Maximum current

| Q1…Q3

On/Off

AC 24…230 V

Min. 5(2) A

ECM fan (RDF440BN, RDF460BN)

Type Voltage

Maximum current

| RDF440BN: Y20, RDF460BN: Y50 DC

DC 0…10 V

Min. ±5 mA

Valve output (RDF400BN, RDF460BN) Voltage

Maximum current

| Y1 (N.O.), Y2 (N.O.) AC 100…230 V Min. 5(2) A
Valve output (RDF440BN) Voltage

Maximum current

| Y10, Y20 DC 0…10 V

Min. ±1 mA

CAUTION
If fans must be connected in parallel, connect one fan directly, for additional fans, one relay for each speed.

Multifunctional input

X1-M
Temperature sensor input
Type| NTC 3k
Temperature range| -20…70 °C
Temperature sensor input
Type| NTC 10k
Temperature range| -20…70 °C
Multifunctional input

Digital input
Operating action| Selectable (NO/NC)
Contact sensing| DC 0…5 V, max. 5 mA
Insulation against mains| SELV
Operational data

Hysteresis

• Heating mode (P43)
• Cooling mode (P44)

| ****

• 0.5…6 K (factory setting: 2 K)
• 0.5…6 K (factory setting: 1 K)

P-band Xp

• Heating mode (P43)
• Cooling mode (P44)

| ****

• 0.5…6 K (factory setting: 2 K)
• 0.5…6 K (factory setting: 1 K)

Setpoint setting range

• Comfort mode (P20, P21)
• Economy mode (P22, P23)
• Protection mode (P50, P51)

| ****

• 5…40 °C
• Off, 5…40 °C
• Off, 5…40 °C

Built-in room temperature sensor

• Measuring range
• Accuracy at 25 °C
• Temperature calibration range

| ****

• 0…50 °C
• < ±0.5 K
• – 5.0…+5.0 K

Resolution of settings and display

• Temperature setpoints
• Current temperature value displayed

|

• **** 0.5 °C
• 0.5 °C

Ambient conditions and protection classification

Classification as per EN 60730

Function of automatic control devices Degree of pollution

Overvoltage category Action type

Rated impulse voltage Maximum altitude Software class

| ****

• Type 1
• 2
• III
• 1 as per EN 60730-1
• 4 kV as per EN 60730-1
• 3000 m as per EN 60730-1 A as per EN 60730-1

Classification of protection against electric shock| Device suited for use with equipment of protection class II.
Ambient conditions and protection classification

Degree of protection of housing to EN 60529 (after mounting in position)

Room automation station With terminal cover

| ****

IP30 IP30

Climatic ambient conditions|
– Storage as per EN 60721-3-1|
Temperature range| -5…+50 °C
Humidity range| 5…95 % r.h.
– Transport (packaged for transport) as per|
EN 60721-3-2|
Temperature range| -25…+70 °C
Humidity range| 5…95 % r.h.
– Operation as per EN 60721-3-3 1)|
Temperature range| 0…50 °C
Humidity range| 5…95 % r.h.
Mechanical ambient conditions

Storage as per EN 60721-3-1 Transport as per EN 60721-3-2 Operation as per EN 60721-3-3

| ****

Class 1M2 Class 2M2 Class 3M2

1. No condensation permitted.

Standards, directives and approvals

Electromagnetic compatibility| For residential, commercial environments
EU conformity (CE)| A5W00725824A )
RCM| A5W00727514A )
UKCA| A5W00725826A )
REACH| Regulation (EC) No 1907/2006 Registration, Evaluation, Authorization and Restriction of Chemicals (REACH)
RoHS| Directive 2011/65/EU restriction of the use of certain hazardous substances in electronic equipment
Environmental compatibility| The product environmental declaration (A5W00718438A ) contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging, environmental benefit, disposal).
General

Weight without/with package

• RDF400BN
• RDF440BN
• RDF460BN

|

• 162.8 g / 256.4 g
• 155 g / 248.4 g
• 151.9 g / 247.4 g

Materials

• Control unit
• Mounting plate

|

• PC
• PC + 10% GF

Colors

• Frame
• Screen

|

• White RAL 9016
• Black RAL 9005

Housing flammability class according to UL94| V-0

*) The documents can be downloaded from http://siemens.com/bt/download.

Diagrams

Connection terminals

open (AC 100…230 V)
Y2 *| SPST relay output, 2-pipe with electric heater, or 4-pipe cooling, normally open (AC 100…230 V)
Y10| Control outputs “valve” DC 0…10 V, 2-pipe cooling/heating, or 4-pipe heating
Y20| Control outputs “valve” DC 0…10 V, 4-pipe cooling, and 2-pipe DC fan
Y50| Control output “Fan” DC 0…10 V
X1| Multifunctional input, e.g., sensor, switch or DC 0…10 V signal (actuator feedback)
M| Input reference ground for X1, D1
M| DC fan reference
D1| Digital input, e.g., switch
BN+, BN-

| BACnet or Modbus terminals
REF| BACnet or Modbus reference ground

• 3-wire valve and 3-position valve actuators can also be used for 2-pipe application with Y1 and Y2 connected and P04 configured.
  ** For RDF440BN, the relay voltage for Qx is AC 24…230 V.
  *** Isolated for RDF440BN

Connection diagrams

Q1, Q2, Q3

**

| Fan control output (relay output), Q1-low，Q2-middle，Q3 -high (AC 100…230 V)
Y1 | SPST relay output, 2-pipe cooling/heating, or 4-pipe heating, normally open (AC 100…230 V)
Y2 | SPST relay output, 2-pipe with electric heater, or 4-pipe cooling, normally open (AC 100…230 V)
Y10| Control outputs “valve” DC 0…10 V, 2-pipe cooling/heating, or 4-pipe heating
Y20| Control outputs “valve” DC 0…10 V, 4-pipe cooling, and 2-pipe DC fan
Y50| Control output “Fan” DC 0…10 V
X1| Multifunctional input, e.g., sensor, switch or DC 0…10 V signal (actuator feedback)
M| Input reference ground for X1, D1
M| DC fan reference
D1| Digital input, e.g., switch
BN+, BN- ***| BACnet or Modbus terminals
REF| BACnet or Modbus reference ground

• 3-wire valve and 3-position valve actuators can also be used for 2-pipe application with Y1 and Y2 connected and P04 configured.
  ** For RDF440BN, the relay voltage for Qx is AC 24…230 V.
  *** Isolated for RDF440BN

Application examples

(optional)
M1 1-speed or 3-speed fan|

Dimensions (mm)

Issued by
Siemens Switzerland Ltd
Smart Infrastructure
Global Headquarters
Theilerstrasse 1a
CH-6300 Zug
+41 58 724 2424
www.siemens.com/buildingtechnologies

© Siemens 2023
Technical specifications and availability subject to change without notice.

• Document ID A6V14070478_en–_a
• Edition 2023-12-13

References

• Smart Information Delivery
• Smart Information Delivery
• Building technology - Siemens Global
• SIOS
• CERT Services - Siemens Global
• Smart Information Delivery
• Industrial Cybersecurity - Siemens Global

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