Siemens BETA Low-Voltage Circuit Protection

BETA Measuring

Three-Phase Measuring Devices

KT1 39 LAN couplers

11/18

Siemens ET B1 · 10/2008

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More information

Connection of the LAN coupler to a LAN

Each station in a LAN must be assigned its own IP address. On

delivery, or after a reset, the LAN coupler has a standard IP address.

The new IP address must be set in the LAN coupler during

commissioning. To do this, the LAN coupler must be directly

connected to a PC using a so-called "cross-over" cable. This is

a network cable in which the transmit and receive wires are

cross-connected. This creates a small LAN with 2 stations, PC

and LAN coupler can communicate with each other directly. The

supplied LAN coupler configuration tool must be installed on

the PC. This direct connection can then be used to set a new

IP address in the LAN coupler, as well as other network parameters,

such as subnet mask and default gateway. The LAN coupler

must then be connected to the target system as communication

is subsequently only possible with the new settings.

Connection of measuring devices to the LAN coupler

E-counters and multicounters are connected to the

LAN couplers over their communication interface. The network

is an RS 485 network in which devices are connected over a

shielded 2-wire cable. When using Modbus, the device address

and transmission rate must be set in the multicounters. This is

not necessary if using the multicounters and E-counters over the

LAN coupler, as the LAN coupler automatically detects and

identifies any connected E-counters and multicounters. You can

now use the LAN coupler configuration tool (over the LAN network)

to tell the LAN coupler the device from which you want to retrieve

the measurement data.

The LAN coupler carries out a so-called "polling" during runtime.

This cyclically retrieves the most recently gathered measurement

data from the measuring devices and buffers them in the

LAN coupler. This can then be called up at any time over the

LAN.

Data transmission from LAN coupler to PC

This data transmission is PC-controlled. A software tool runs in

the background on the PC and uses the network to cyclically

retrieve any measurement data from all available LAN couplers

and save it to the hard disk.

Software tool

The supplied software tool has the following functions:

•

Background transmission of measurement data from

multicounters and E-counters and a number of LAN couplers

•

Full display of device measurement data through a macro

based on MS Excel

•

Adjustable limit value signals for measured quantities

•

Limit violations are signaled with time stamp.

You will find further information on Modbus operation on the

Internet at:

http://www.siemens.com/beta

Display of measurement data on the PC

A Visual Basic macro for MS Excel is supplied with the LAN coupler

for the display of measurement data on a PC. Among other

things, this software tool lets you display all 35 measurement

data of a 7KT1 34 multicounter on a single panel. You can then

select the various measuring devices you want to display from a

small list box. The software also lets you set alarm limits for up to

measured quantities of a multicounter.

If a measured value exceeds or falls below the specified limits,

the relevant indication is output, complete with time stamp from

the PC clock.

Display of measurement data of a multicounter

Simultaneous display of measurement data on more than

one PC

The software supplied with the LAN coupler supports display of

measurement data on any number of PCs connected to the

network over a client-server architecture.

A PC acts as the server, similar to an Intranet or Internet server.

This PC runs the software components that retrieve the measurement

data from the LAN coupler and save it to hard disk. The MS Excel

macro can be used to visualize the measurement data on both

the server PC and the clients.

Other client PCs can access the data pool of the server PC to

visualize the measurement data.

Open software architecture

The architecture of the software tool is open and can be

customized to suit user requirements. The MS Excel macros are

freely accessible and can also be customized by the user.

Block diagram of a system

TCP/IP

network

PC Clients

Communication software

MS EXCEL visualization

Configuration tool (only

required for configuration of

the LAN coupler)

LAN coupler

Measuring

device 10

I201_13445

RS485

Measuring

device 2

LAN coupler

Measuring

device 1