Siemens WTV531-GA5060 User manual

A6V10844290_en
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Smart Infrastructure
2019-10-21
Meters and Energy Cost Allocation
M
-bus Level converter 60
WTV531
-GA5060
The level converter WTV531-GA5060 is an interface between M-bus meters and
reader systems. PC software ACT531 reads the data locally or via the Int
ernet
using an optional web server.
●
Connect up to 60 M-bus devices (max. 60 simply M-bus loads)
●
Use up to six level converters on one M-bus network with a max. of 360 simple
M-bus loads
●
Local data read out with the ACT531 PC software via USB or the
RS-232 interface
●
Remote read out via M-bus web server
●
Local data read out via a PXC device via the RS-232 interface
●
Reads a max. 1,000 logical devices on a level converter network
●
Supply voltage AC/DC 24 V

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Use
The level converter is the communications interface to read up to
60 M-bus devices (simple M-bus loads).
The data is read out:
●Locally with the ACT531 PC software via USB
●Locally with the ACT531 PC software via the RS-232 interface
●Via the M-bus web server WTV534.., WTV676..
●Via Desigo CC
Up to six level converters can be connected in parallel to a M-bus web server WTV676..
(Master) on a M-bus network.
Up to 60 M-bus devices can be connected to each level converter WTV531... The level
converter can be used:
●As individual components on a M-bus network.
●To extend a M-bus network by up to six level converters connected in parallel.
You can also use the level converter at your own risk as an interface to suitable software and
devices by third-party manufacturers.
The level converter is protected against short circuits.
NOTICE
We recommend using a DC 24 V power supply to ensure a stable signal.

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Functions
Operating modes
The data can be read in different ways.
Local data read out with the ACT531 software via the USB connection
The level converter is used as the communication interface between M-bus devices and a
laptop using the ACT531 software. The ACT531 software can read a max. of 1,000 logical
devices.
The level converter is operated as the master. The data is read locally via the USB
connection.
A Level converter as master
B Laptop with ACT531 software
Local data read out using the ACT531 PC software via the RS-232 interface
The level converter can also be connected to a laptop via a RS-232 interface.
(6) (6) (6) (6) (7) (7) (7) (7) (8) (9)
M-Bus MASTER Vin
LC
(3) (4)
A B C
V A V B
(5)(1) (2)
USBActivity
TXD
RXD
M-Bus Error
M-Bus Ready
Power
M-Bus
SLAVE
WEV531-GA5060
A
B
A Level converter as master
B Laptop with ACT531 software

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Remote read out via M-bus web server
The level converter is used as the communication interface between M-bus devices and a
M-bus web server.
The master level converter WTV531(A) is connected to a M-bus web server WTV676.. via
the RS-232 interface (terminals A, B, C).
The following slave level converters (B) can be connected via the M-bus slave connection.
The data can be read via the web server from anywhere on the Internet.
A maximum of 250 devices can be read via M-bus web server WTV676...
A
Level converter as master
B
Level converter as slave
NOTICE
The level converter is connected as a slave (B) to the web server (A) (terminals M1M2 of
the web server) if the firmware version of the web server WTV676.. is less than
SIE.WTV676_WI-2.29_FW-3.0-17-2.6.

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Local data read out with Desigo CC via the RS-232 interface
The TX Open module integrates M-bus devices via a RS-232 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]".
TXI2.OPEN
Desigo CC
(6) (6) (6) (6) (7) (7) (7) (7) (8) (9)
M-Bus MASTER Vin
LC
(3) (4)
ABC
V A V B
(5)
(1) (2)
USBActivity
TXD
RXD
M-Bus Error
M-Bus Ready
Power
M-Bus
SLAVE
WEV531-GA5060
The level converter can be used in various ways.
Up to 60 M-bus devices can be connected to each level converter WTV531...

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Level converter as individual component
The level converter can be used as an individual component on one M-bus network with up
to 60 devices.
Level converter to extend a M-bus network
The level converter extends a M-bus network with up to six level converters connected in
parallel.
It is connected with a serial connection to the master level converter and in parallel to other
level converters.
A maximum of six level converters can be integrated in parallel and connected to a M-bus
web server WTV676... A maximum of five level converters can be connected in parallel to a
master level converter WTV531.
A maximum of 360 M-bus loads or 1,000 logical devices can be read via the master level
converter.
A Level converter as master
B Level converter as slave

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Indicators
The level converter has six LEDs on the front side for indicating the
operating state.
USB activity
The LED indicates the USB interface connection state.
●Flashes 2 x -> The device is ready to connect to a PC using a mini USB-B cable.
●Flashes 5 x -> The device is connected to a PC and correctly recognized by it.
TXD
The LED indicates the transmission state on the M-bus master (terminals 6 and 7).
●On -> Data transmitting.
●Off -> No data transmission.
RXD
The LED indicates the receive state on the M-bus master (terminals 6 and 7).
●On -> Data is being received.
●Off -> No data is being received.
M-bus error
The LED indicates the state of the M-bus power supply.
●On -> Bus overload. (short circuit or too many devices on the bus).
●Off -> No faults recognized.
M-bus ready
The LED indicates that bus power is correct and there are no anomalies.
●On -> Bus power is properly polled and sufficient for trouble-free operation.
●Off -> Bus power is insufficient for trouble-free operation.
Power
The 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.

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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 Tree topology

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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.
●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 1,000 m (see EN13757-2 appendix E).
Signal specification
M-bus Condition Minimum Typical Maximum Measuring unit
Number simple
M-bus loads per
segment
WTV531-GA5060 0 60
Transfer rate CSegment ≤ 382 nF 300 2400 9600 baud
Bus power (Master) WTV531-GA5060 30 39 40 R
Bus current (master) WTV531-GA5060 0 90 mA