Power supply

Operating voltage

AC/DC 24 V +/- 10 % (SELV)

AC frequency

50 / 60 Hz

Maximum power consumption

14.5 W, 15 VA

Internal fuse

PTC resistance and varistor

Transformer with secondary current limit of max. 10 A or external secondary current fuse

Non-renewable fuse: Slow to a max. 10 A

Circuit breaker: Max. 13 A, type B, C, D per EN 60898

Battery backup of real-time clock:

Lithium type CR2032 (can be replaced on the plant)

Battery operation: A total of 5 years

Unused: 7 years

 

WLAN

Frequency band

2.4 GHz

WLAN standard

802.11 b/g/n

 

Pins (terminal block)

M-bus master (terminals 4 and 5):

Connections for M-bus devices

and

Connection for the following level converters

3 digital inputs:

Contact sensing:

Voltage: DC 2.2 V

Current at closed contact: 0.4 mA

OFF = Resistance between terminal 8 and 9,10,11 > 6 kΩ

ON = Resistance between terminal 8 and 9,10,11 < 3kΩ

2 digital outputs:

Relay with max. contact rating:

  • 5 A @ AC/DC 30 V (resistive load)
  • 2 A @ AC/DC 30 V (inductive load cosφ = 0.4)

Insulating strength between relay and electronics:

  • 1kV AC (SELV-SELV circuits)

External fusing of supply line

  • Non-renewable fuse: Slow to a max. 5 A
  • Circuit breaker: Max. 6 A, type B, C, D per EN 60898

Terminals A, B, C

RS-232 interface for the following level converters

A = RX

B = TX

C = GND

Terminals M1, M2

Connections for M-bus devices (max. 20) and for follow-on level converters

 

Interfaces

Ethernet

Interface type: 10/1000Base-TX, IEEE 802.3 compatible

Bit rate: Max. 100 MBit/s

Recognition: Auto MDI-X

N°1 (1 MAC): ETH: Ethernet port

Field bus

M-bus: Max. 20 devices

Max. number of wireless devices: 2,500

Max. number of wired M-bus devices: 250

M-bus interface

Current draw:
1 M-bus load

Addressing:
Primary or secondary

Baud rate:
300, 2400, or 9600 baud

Max. permissible reading frequency:
Typically twice a day

Protocol:
As per EN 13757-2/-3, EN 1434-3

RF protocol backbone to RF converter (mesh network)

Frequency band: 868.00...870.00 MHz

 

M-bus1

Reference standard

EN13757-4 Physical and Link Layer (Operating modes: C, S, T mode) for wireless M-bus

EN13757-3 (Application layer)

Baud rate

300 bps...9600 bps

Max. number of M-bus IoT gateways connected directly to the web server with a cable

20 (simple M-bus loads)

WT.. network node integration

  • M-Bus load
  • Max. number of network nodes per network
  • Number of networks that can be read out per M-bus IoT gateway

 

1 simple M-Bus load per network node

12

 

5

Max. number of level converters on the M-bus IoT gateway

6

Max. number of wired M-bus devices per level converter

WTV531: 60

WTX631: 250

Max. number of level RVD2.. M-bus IoT gateways

500

Max. number of RF converters on the M-bus IoT gateway

23

Max. number of wireless devices per RF converter

500

Max. number of readable devices

Wired: 380 M-bus loads or 500 logical M-bus devices

Wireless: 2,500 devices

The limitations only apply to logical M-bus devices (500). Up to six level converters WTX631 can be connected to each line (1500 M-bus loads per line).

Bus power

Min. 24 V

Max. 42 V

Bus supply current

Max. 30 mA

Protection against short circuits

Yes

 

Ambient conditions

Operation

Per IEC/EN 60721-3-3

Climatic conditions

Class 3K23

Temperature

-5…+50° C

Air humidity

5...95 % r.h.

Mechanical conditions

Class 3M11

Transportation

Per IEC/EN 60721-3-2

Climatic conditions

Class 2K12

Temperature

-40…+70° C

Air humidity

5...95 %

Mechanical conditions

Class 2M4

Storage

Per IEC/EN 60721-3-1

Climatic conditions

Class 1K22

Temperature

-40…+70° C

Air humidity

5...95 %

Mechanical conditions

Class 2M4

Degree of protection

Degree of protection

IP20 per EN 60529

Protection class

III per EN 62368-1

 

Mounting

Mounting type

On 35mm DIN rails (EN60715)

 

Standards and guidelines

Product standards

EN 62368-1

Information Technology Equipment Safety

Electromagnetic compatibility

For residential, commercial, and industrial environments

EU conformity (CE)

See EU declaration of conformance *)

Environmental compatibility

The product environmental declaration 1) contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging, environmental benefit, disposal).

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

External features

Housing materials and colors

PC + ASA, RAL 9010 (white)

Dimensions (L x W x H)

110 x 71 x 62 mm

Weight, including mounting instructions

0.207 kg