Siemens M-bus Level Converter/Repeater 250 Bedienungsanleitung

A6V11742346_en

--_a Smart I

nfrastructure

2019-10-01

Meters and Energy Cost Allocation

-bus Level Converter/Repeater 250

WTX631

-GA0090

The level converter/repeater WTX631-GA0090 is the interface between M-bus

device and a read system. It consists of a level converter and

the associated

power supply.

●

The level converter and associated power supply form a unit: No addition

transformer or auxiliary power required

●

Connect up to 250 M-bus devices (max. 250 simply M-bus loads)

●

Can be used with the M-bus web server WTV676.., PXC devices, other M-bus

read / configuration systems

●

Up to 6 level converters connected in parallel on one M-bus network

●

Up to 6 level converters (max. 5 level converters as repeater,

serial) connected on

one M-bus network

●

Local data reading of M-bus devices via RS-232 or RS-485 interface

●

Remote reading of M-bus devices via M-bus web server WTV676.. (Cloud)

Smart Infrastructure

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Use

The level converter is the communications interface to read up to 250 M-bus devices (simple

M-bus loads).

The data is read via a M-bus web server WTV676, a PXC device, or via other M-bus

read/configuration systems.

Multiple level converters can be connected in parallel on one M-bus network. When

connected to a M-bus web server, up to six level converters can be connected in parallel. Up

to six level converters/repeaters can be serially connected (max. five level converters as

repeater).

The power supply can be used to power the M-bus web server (output "Vout 24Vdc").

(6) (6) (6) (6) (7) (7) (7) (7) (8) (9)

M-Bus MASTER Vin

(5) (3) (4) (3) (4)

ABC

RS-485

(5)

(1) (2)

DE F RS-232

Run

TX M-Bus

RX M-Bus

Short Circuit

Overload

Power

WTX631-GA0090

LEVEL CONVERTER

(3) (4) (5) (6)

Vout

24Vdc

(4)

V-

(5)

(1) (2)

Power

230Vac

Vout

WTX631-GA0090

POWER SUPPLY

The level converter/repeater can be connected and used as follows:

●As M-bus slave (repeater) on a M-bus web server WTV676.. .

●As M-bus level converter via interfaces RS-232 or RS-485 to a PXC device or a laptop.

Up to 250 M-bus devices can be connected to the M-bus master (250 simple M-bus loads).

The input for the M-bus slave and the RS-232 interface are galvanically isolated.

Interface RS-485 and the output for the M-bus master are not galvanically isolated.

The output on the M-bus master is protected against short circuits.

You can use the level converter at your own risk as an interface as well to suitable software

and devices by third-party manufacturers.

Smart Infrastructure

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2019-10-01

Functions

Operating modes

The power supply can be employed as follows:

●To power the level converter

(6) (6) (6) (6) (7) (7) (7) (7) (8) (9)

M-Bus MASTER Vin

(5) (3) (4) (3) (4)

A B C

RS-485

(5)

(1) (2)

D E F

RS-232

Run

TX M-Bus

RX M-Bus

Short Circuit

Overload

Power

(3) (4) (5) (6)

out

24Vdc

(4)

V-

(5)

(1) (2)

Power

230Vac

Vout

WTX631-GA0090

LEVEL CONVERTER WTX631-GA0090

POWER SUPPLY

(8) (9)

(3) (4)

1 Level converter/repeater 2 Power supply

●To power the M-bus web server WTV676.. (DC 24 V).

(6) (6) (6) (6) (7) (7) (7) (7) (8) (9)

M-Bus MASTER Vin

(5) (3) (4) (3) (4)

A B C

RS-485

VAVB

(5)

(1) (2)

D E F RS-232

Run

TX M-Bus

RX M-Bus

Short Circuit

Overload

Power

(3) (4) (5) (6)

Vout

24Vdc

(4)

V+V-

(5)

(1) (2)

Power

230Vac

Vout

VAVB

WTX631-GA0090

LEVEL CONVERTER WTX631-GA0090

POWER SUPPLY

A Web server WTV676.. 1 Connection web server WTV676.. with power

supply WTX631

B Level converter/repeater

WTX631 2 Connection level converter/repeater with

power supply

The level converter can be used in various ways.

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Level converter as slave, reading over the M-bus web server

The level converter is connected as a slave to a M-bus web server WTV676.. to extend the

M-bus network. Up to six level converters can be connected in parallel. A max. of six level

converters (max. five repeaters) can be connected serially to overcome large distances. The

data is read via the M-bus web server.

A maximum of 250 M-bus devices can be read via M-bus web server.

A M-bus web server

(M-bus master) 1 M-bus slave, connected in parallel

(max. 6 level converters)

B Level converter 2 RS-232, serially connected (1 level converter and 5

repeaters)

C M-bus wireless devices

D Level converter as repeater

Additional information on web server WTV676.. is available in the user guide

"M-bus web server WTV676-HB6035, M-bus level converter WTX631-GA0090, M-bus level

converter WTV531-GA5060, RF converter WTX660-E05060", document A6V11157985. See

Section "Product documentation [➙12]".

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Level converter as master for reading data over the RS-232 or RS-485 interface

The level converter can be connected as master via the RS-232 or RS-485 interface to a

PXC device or a PC to read device data.

A Level converter (RS232 or RS485 interface)

B PC or M-bus devices

NOTICE

The level converter WTX631-GA0090 does not have a mini USB interface to locally read

the data. The device data cannot be read locally with the ACT531 software.

The TX Open module integrates M-bus devices via a RS-232 or RS-485 interface to the

Desigo CC building management platform.

Additional information on the Desigo CC management platform is available in the

engineering guide 'Desigo TM TX Open, TX M-bus', document CM110572. See Section

"Product documentation [➙12]".

Smart Infrastructure

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Level converter as standalone device with up to 250 connected M-bus devices

The level converter can be used as the master on one M-bus network with up to 250 M-bus

devices.

Smart Infrastructure

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Displays

The level converter has six LEDs on the front side for indicating the operating state.

Run

TX M-Bus

RX M-Bus

Short Circuit

Overload

Power

Run…

The (green) LED indicates the operational state of the device.

●Blinking at 1 Hz (slow) -> Device functions are being set up. No communication.

●Blinking at 0 Hz (fast) -> Device update pending.

●On -> The device is operational.

TX M-bus

The (green) LED indicates the transmission state on the M-bus network (terminals 9 and 10).

●On -> Data is transmitting.

●Off -> No data is transmitting.

RX M-bus

The (orange) LED indicates the receive state of data on the M-bus network (terminals 6 and

7).

●On -> Data is being received.

●Off -> No data is being received.

Short circuit

The (red) LED indicates a short circuit on the bus, very high traffic, or a collision.

Overload

The (orange) LED indicates a bus overload that may prevent correct operation.

●On -> Bus overload that may prevent correct operation.

●Off -> No bus overload recognized.

Power

The (green) LED indicates the state of the level converter power supply.

●On -> The device power supply is correct.

●Off -> Device power is not correct or unavailable.

Smart Infrastructure

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Technical design

Topology

The M-bus permits various network topologies. The devices can be connected to the level

converter in a line, bus, star, or tree topology, or a combination thereof.

Ring topology is not permitted.

Bus cable polarity is not relevant, simplifying installation.

Line topology

Bus topology

Star topology

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Tree topology

Combination of topologies

Ring topology

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M-bus

Address

M-bus uses two types of addresses to recognize devices:

●Primary addressing: Up to 250 primary addresses can be assigned to a M-bus system.

The primary address is normally assigned during device commissioning. Pure primary

addressing is not possible if more than 250 devices are read on the M-bus network.

●Secondary addressing: Secondary addressing consists of 8 bytes and permits the

assignment of any number. In the default setting, the secondary address for a device

normally matches the serial number issued by the device manufacturer. The assignment

prevents address conflicts on the bus.

Bus expansion

Plant type Maximum

distance Total cable

length Cable cross

section Number of

devices (slaves) Max.

transmission

rate

Small residential

buildings 350 m 1000 m 0.8 mm2250 9600 baud

Large residential

buildings 350 m 4000 m 0.8 mm2250 2400 baud

64 9600 baud

Small

developments 1000 m 4000 m 0.8 mm264 2400 baud

Large

developments …3000 m* 5000 m 1.5 mm264 2400 baud

Direct vicinity …5000 m* 7000 m 1.5 mm216 300 baud

Point-to-point

connection …10000 m* 10000 m 1.5 mm21 300 baud

*Shielded cabling required at a distance in excess of 1000 m (see EN13757-2 appendix E).

Signal specification

M-bus Condition Minimum Typical Maximum Measuring unit

Number simple

M-bus loads per

segment

WTX631-

GA0090 0 - 250 -

Transmission

rate CSegment ≤ 382 nF 300 2400 9600 baud

Bus power

(Master) WTX631-

GA0090 30 39 42 R

Bus current

(master) WTX631-

GA0090 0 - 375 mA

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