HMS Anybus Modbus to KNX Gateway Bedienungsanleitung

Modbus to KNX Gateway

USER MANUAL

SCM-1202-050 1.2 en-US ENGLISH

Important User Information

Disclaimer

The information in this document is for informational purposes only. Please inform HMS Industrial Networks of any

inaccuracies or omissions found in this document. HMS Industrial Networks disclaims any responsibility or liability

for any errors that may appear in this document.

HMS Industrial Networks reserves the right to modify its products in line with its policy of continuous product

development. The information in this document shall therefore not be construed as a commitment on the part of

HMS Industrial Networks and is subject to change without notice. HMS Industrial Networks makes no commitment

to update or keep current the information in this document.

The data, examples and illustrations found in this document are included for illustrative purposes and are only

intended to help improve understanding of the functionality and handling of the product. In view of the wide range

of possible applications of the product, and because of the many variables and requirements associated with any

particular implementation, HMS Industrial Networks cannot assume responsibility or liability for actual use based on

the data, examples or illustrations included in this document nor for any damages incurred during installation of the

product. Those responsible for the use of the product must acquire sufficient knowledge in order to ensure that the

product is used correctly in their specific application and that the application meets all performance and safety

requirements including any applicable laws, regulations, codes and standards. Further, HMS Industrial Networks will

under no circumstances assume liability or responsibility for any problems that may arise as a result from the use of

undocumented features or functional side effects found outside the documented scope of the product. The effects

caused by any direct or indirect use of such aspects of the product are undefined and may include e.g. compatibility

issues and stability issues.

Modbus to KNX Gateway User Manual SCM-1202-050 1.2 en-US

Table of Contents Page

1 Preface ................................................................................................................................. 3

1.1 About This Document .......................................................................................................3

1.2 Document Conventions.....................................................................................................3

1.3 Trademarks.....................................................................................................................3

2 Safety ................................................................................................................................... 4

3 Product Description ............................................................................................................ 5

3.1 General..........................................................................................................................5

3.2 Operation.......................................................................................................................5

3.3 KNX Interface ..................................................................................................................6

3.4 Modbus Interface.............................................................................................................7

4 Installation........................................................................................................................... 9

4.1 Overview........................................................................................................................9

4.2 Mechanical Installation ................................................................................................... 12

4.3 Connecting the KNX interface........................................................................................... 13

4.4 Connecting the Modbus interface ..................................................................................... 13

4.5 Connecting the Power Supply........................................................................................... 14

4.6 Configuration Connections............................................................................................... 14

5 Anybus Configuration Manager (MAPS) .......................................................................... 15

5.1 Installation.................................................................................................................... 15

5.2 Connection Tab ............................................................................................................. 16

5.3 Configuration Tab .......................................................................................................... 18

5.4 Signals Tab.................................................................................................................... 25

5.5 Receive/Send Tab .......................................................................................................... 27

5.6 Diagnostic Tab............................................................................................................... 28

A Technical Data ................................................................................................................... 31

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Preface 3 (32)

1 Preface

1.1 About This Document

This document describes how to configure and use the Modbus to KNX Gateway.

The instructions in this document require a basic knowledge of KNX and Modbus technologies

and terminology.

For additional related documentation and file downloads, please visit www.anybus.com/support.

1.2 Document Conventions

Numbered lists indicate tasks that should be carried out in sequence:

1. First do this

2. Then do this

Bulleted lists are used for:

• Tasks that can be carried out in any order

• Itemized information

►An action

→ and a result

User interaction elements (buttons etc.) are indicated with bold text.

Program code and script examples

Cross-reference within this document: Document Conventions, p. 3

External link (URL): www.hms-networks.com

WARNING

Instruction that must be followed to avoid a risk of death or serious injury.

Caution

Instruction that must be followed to avoid a risk of personal injury.

Instruction that must be followed to avoid a risk of reduced functionality and/or damage

to the equipment, or to avoid a network security risk.

Additional information which may facilitate installation and/or operation.

1.3 Trademarks

Anybus®is a registered trademark of HMS Industrial Networks. All other trademarks mentioned

in this document are the property of their respective holders.

Modbus to KNX Gateway User Manual SCM-1202-050 1.2 en-US

Safety 4 (32)

2 Safety

Connecting power with reverse polarity or using the wrong type of power supply may

damage the equipment. Make sure that the power supply is connected correctly and of

the recommended type.

This product contains parts that can be damaged by electrostatic discharge (ESD). Use

ESD prevention measures to avoid damage.

The Modbus to KNX Gateway should only be installed by adequately trained personnel and

according to applicable safety regulations.

The unit should be mounted on a standard DIN rail or screw-mounted onto a flat surface inside a

properly grounded metallic enclosure. The unit should not be mounted outdoors or exposed to

direct sunlight, water, high humidity or dust.

Make sure that you have all the necessary information about the capabilities and restrictions of

your local network environment before installation.

Modbus to KNX Gateway User Manual SCM-1202-050 1.2 en-US

Product Description 5 (32)

3 Product Description

3.1 General

The Anybus Modbus to KNX Gateway is intended for integration of Modbus RTU and Modbus

TCP installations into KNX monitoring and control systems.

On the KNX side the gateway acts as a KNX device, and on the Modbus side it emulates a

Modbus RTU Master device and/or a Modbus TCP Client device. The Modbus slave device(s) are

read by the gateway using automatic continuous polling.

Configuration is carried out using Anybus Configuration Manager (MAPS) which can be

downloaded from www.anybus.com/support..

3.2 Operation

After the startup process has completed, the gateway will continuously read data points from

the connected Modbus TCP Server and/or Modbus RTU Slave devices and update these values in

its memory.

From the KNX system point of view, the whole Modbus system is seen as a single KNX device

with the same configuration and operation characteristics as other KNX devices. Every register in

the Modbus slave devices will be associated with a specific KNX group address. When a new

value is read from Modbus for a given register, a write telegram is sent to the associated KNX

group. When a telegram is received from the KNX bus, a message is sent to the associated

Modbus device to perform the corresponding action.

If a device is not responding during the continuous polling of Modbus devices, a virtual signal

inside the gateway will be activated indicating a communication error with the device. These

virtual signals indicating real-time communication status are accessible from KNX in the same

way as the other data points.

Modbus to KNX Gateway User Manual SCM-1202-050 1.2 en-US

Product Description 6 (32)

3.3 KNX Interface

The gateway connects directly to the KNX TP-1 (EIB) bus and behaves as one more device in the

KNX system, with the same configuration and operational characteristics as other KNX devices.

Internally, the circuit part connected to the KNX bus is opto-isolated from the rest of the

electronics.

The gateway receives, manages and sends all the telegrams related to its configuration to the

KNX bus.

On receiving telegrams of KNX groups associated to internal datapoints, the corresponding

messages are sent to Modbus to maintain both systems synchronised in every moment.

When a change in a signal of the external system is detected, a telegram is sent to the KNX bus

(of the associated KNX group) to maintain both systems synchronised in every moment.

The status of the KNX bus is checked continuously. If a bus drop down is detected (e.g. due to a

failure in the bus power supply), when the KNX bus is restored again, the gateway will retransmit

the status of all the KNX groups marked as “T” Transmit. Also the Updates of the groups marked

as “U” Update will be performed. The behaviour of each individual point into the gateway is

determined by the flags configured for the point.

3.3.1 KNX Points Definition

Every internal datapoint to define has the following KNX properties:

Property Description

Description Descriptive information about the Communication Object or Signal.

Signal Signal's Description. Only for informative purposes, allows identifying the signal

comfortably.

DPT It is the KNX data type used to code the signal's value. It will depend on the type of signal

associated in the external system in every case. In some integrations, it is selectable, in

others it is fixed due to the intrinsic characteristics of the signal.

Group It is the KNX group to which the point is associated. It is also the group to which the read

(R), write (W), transmit (T) and update (U) flags are applied. Is the sending group.

Listening addresses They are the addresses that will actuate on the point, apart of the main Group address.

RRead. If this flag is activated, read telegrams of this group address will be accepted.

Ri Read. It this flag is activated, the object will be read on initialization.

WWrite. If this flag is activated, write telegrams of this group address will be accepted.

TTransmit. If this flag is activated, when the point's value changes, due to a change in the

external system, a write telegram of the group address will be sent to the KNX bus.

UUpdate. If this flag is activated, on gateway start-up or after a KNX bus reset detection,

objects will be updated from KNX.

Active If activated, the point will be active in the gateway, if not, the behaviour will be as if the

point is not defined. This allows deactivating points without the need of delete them for

possible future use.

Modbus to KNX Gateway User Manual SCM-1202-050 1.2 en-US

Product Description 7 (32)

3.4 Modbus Interface

Modbus TCP basically embeds the Modbus RTU protocol in TCP/IP frames. TCP/IP allows faster

communication and a longer distance between the master and slave devices than RTU

communication over serial line. Modbus TCP allows communication over an existing TCP/IP

infrastructure such as a LAN, WAN or the Internet. It also allows multiple Modbus masters to

exist in the same network.

The Modbus to KNX Gateway will act as a master in a Modbus TCP network or as a Modbus RTU

Master, or both. All other Modbus devices connected to the same network must be slave/server

devices.

Each Modbus TCP slave device has an IP address and a predefined register address map. The

address map defines the address, type and characteristics of each internal point (register) of the

device and makes this data accessible through the Modbus TCP protocol.

Each defined point can be configured with a slave address from 0 to 255. This allows for great

flexibility, for example to integrate Modbus RTU slave devices connected in a serial line with an

RTU/TCP converter enabling access to their data points through TCP/IP. The converter,

communicating in TCP, will then identify the destination of the point (slave address in the RTU

network) by the contents of the slave address field.

The Modbus TCP protocol defines different types of function codes to read/write different type

of registers in Modbus devices, and also different data encoding formats. Implementation can

vary between different slave device types and manufacturers. The data encoding and byte order

for 16-bit registers can be configured in the gateway.

The communication parameters (IP address, netmask, default router address and TCP port) of

the Modbus TCP interface are also fully configurable.

See also Modbus Points Definition, p. 8.

Modbus to KNX Gateway User Manual SCM-1202-050 1.2 en-US

Product Description 8 (32)

3.4.1 Modbus Points Definition

Each point defined in the gateway has the following Modbus features associated to it:

Feature Description

Modbus Device Modbus TCP device to which belongs the point, from a list of Modbus TCP slave devices

that can be defined in the gateway (up to 5).

For every Modbus TCP slave device defined, a virtual signal is created automatically in

the gateway to inform about the communication with the device, this signal is available

also from the KNX interface like the rest of the points.

Function code

Read Func

Write Func

One of the following Modbus function codes can be used:

• 1- Read Coils.

• 2- Read Discrete Inputs.

• 3- Read Holding Registers.

• 4- Read Input Registers.

• 5- Write Single Coil.

• 6- Write Single Register.

• 15- Write Multiple Coils.

• 16- Write Multiple Registers.

#Bits Number of bits to be used by this signal.

Data Coding Format One of the following Modbus data coding formats can be used:

• 16/32/48/64 bits unsigned.

• 16/32/48/64 bits signed (one’s complement – C1).

• 16/32/48/64 bits signed (two’s complement – C2).

• 16/32/48/64 bits Float.

• 16/32/48/64 bits Bitfields.

• Error comm

Byte Order • Big Endian

• Little Endian

• Word Inverted Big Endian

• Word Inverted Little Endian

Bit inside the register Bit inside the Modbus register (optional). The gateway allows bit decoding from generic

16 bits input/holding Modbus registers.

Bit coding into 16 bit input/holding Modbus registers is used for some devices to encode

digital values into this type of registers, being these registers normally accessible using

Modbus function codes 3 and 4 (read holding/input registers).

Modbus to KNX Gateway User Manual SCM-1202-050 1.2 en-US

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