Helmholz 700-159-3MB01 User manual

Helmholz GmbH & Co. KG | Hannberger Weg 2 | 91091 Großenseebach | Germany 16.03.2021
Phone [phone] | Fax [phone] | [e-mail] | www.helmholz.de
Quick Start Guide
PN/ModbusTCP Coupler
Order number: 700-159-3MB01
For firmware V1.00 and above
Version
en
3

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Content
1Safety instructions ................................................................................................ 3
2Introduction ......................................................................................................... 3
3Function of the PN/ModbusTCP Coupler.............................................................. 4
4Connection........................................................................................................... 4
4.1 Power supply ............................................................................................................................... 4
4.2 Network ....................................................................................................................................... 5
5Install GSDML file ................................................................................................. 5
6Data exchange concept ........................................................................................ 6
6.1 Example of a configuration ........................................................................................................... 7
6.2 Supported ModbusTCP function codes ........................................................................................ 7
7Configuration in the TIA-Portal ............................................................................ 8
7.1Parameters of the PN/ModbusTCP Coupler .................................................................................. 8
7.2 Configure ModbusTCP modules................................................................................................. 10
7.3 Assign a PROFINET device name to the PN/ModbusTCP Coupler ................................................ 11
8Status and control via PLC program ...................................................................12
9Webinterface of PN/ModbusTCP Coupler........................................................... 13
10 MQTT Publisher ...............................................................................................15
10.1 MQTT Publisher Settings ............................................................................................................ 15
10.2 MQTT data format...................................................................................................................... 16
11 Firmware update ............................................................................................. 17
12 Resetting to factory settings ............................................................................ 17
13 Technical data .................................................................................................18
14 LED status information ....................................................................................19

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1Safety instructions
Target audience
This description is only intended for trained personnel qualified in control and automation
engineering who are familiar with the applicable national standards. For installation,
commissioning, and operation of the components, compliance with the instructions and
explanations in this operating manual is essential. The specialist personnel is to ensure that the
application or the use of the products described fulfills all safety requirements, including all applicable laws,
regulations, provisions, and standards.
Intended use
The device has a protection rating of IP 20 (open type) and must be installed in an electrical
operating room or a control box/cabinet in order to protect it against environmental
influences. To prevent unauthorized operation, the doors of control boxes/cabinets must be
closed and possibly locked during operation. The consequences of improper use may include
personal injury to the user or third parties, as well as property damage to the control system, the product,
or the environment. Use the device only as intended!.
Operation
Successful and safe operation of the device requires proper transport, storage, setup,
assembly, installation, commissioning, operation, and maintenance. Operate the device only
in flawless condition. The permissible operating conditions and performance limits (technical
data) must be adhered to. Retrofits, changes, or modifications to the device are strictly
forbidden.
Security
The device is a network infrastructure component and therefore an important element in the
security consideration of a plant. When using the device, therefore, observe the relevant
recommendations to prevent unauthorized access to installations and systems. Further
information on this can be found in the device manual.
2Introduction
This document explains the initial commissioning of the PN/ModbusTCP
Coupler. The latest version of the document and a detailed manual can be
found at www.helmholz.de or scan the QR code directly.

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3Function of the PN/ModbusTCP Coupler
With the PN/ModbusTCP Coupler a simple and uncomplicated connection of a PROFINET network with
a ModbusTCP network is possible. The PN/ModbusTCP Coupler allows the data transfer between a
PROFINET controller and ModbusTCP stations.
Received input data on one of the
network sides is made available as
output data to the other network side.
The IO data transfer takes place live and
as quickly as possible without additional
handling blocks.
The maximum size of the transmitted
data is 1024 bytes of input/output data.
Up to 300 slots for IO modules are
available.
The integration into the PLC
engineering tool is made possible by a
GSDML file; special configuration
software isn’t necessary.
In addition to the PROFINET / ModbusTCP communication, the PN/ModbusTCP Coupler also makes an
MQTT Publisher available on both network sides. In this way, the values exchanged via the gateway can
also be distributed via MQTT to visualization or operating data recording systems.
4Connection
4.1 Power supply
The PN/ModbusTCP coupler must be supplied with DC 24 V at the wide-range input DC 18 ... 30 V via
the supplied connector plug. The power supply is redundant, at least one supply path PS 1 or PS 2 must
be connected.

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The housing of the PN/ModbusTCP Coupler is not grounded. Please connect the functional
earth terminal (FE) of the PN/ModbusTCP Coupler properly to the reference potential.
4.2 Network
The left RJ45 sockets "X1 P1" and "X1 P2" are used to connect the PROFINET network, the right RJ45
sockets "X2 P1" and "X2 P2" are used to connect the ModbusTCP network. The ports X1 P1 and X1 P2, as
well as X2 P1 and X2 P2 are each internally connected to a switch.
The interfaces X1 and X2 are logically separate networks and not physically connected. Thus, there is a
clear separation between the PROFINET network and the ModbusTCP network. A network penetration
with other functions by the PN/MQTT coupler is not possible. The configured values are exchanged in
the PN/ModbusTCP Coupler only as IO data between both network sides.
5Install GSDML file
Please download the GSDML file ("GSDML-V2.34-Helmholz-PN-ModbusTCP-coupler-
____.xml") at www.helmholz.de or scan the QR code. Install the GSDML file in the
"Tools" / "Manage device description file (GSD)" menu in the TIA Portal.
The PN/MQTT Coupler can be found in the hardware catalog
at "Other field devices / PROFINET IO / Gateway / Helmholz
GmbH & Co. KG".

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6Data exchange concept
The PN/ModbusTCP Coupler is a ModbusTCP server. It receives data via ModbusTCP, which is
transferred to the IO image of the PROFINET PLC (inputs in the PLC) and provides data, which it receives
from the PROFINET PLC (outputs in the PLC).
ModbusTCP distinguishes 4 different data types:
Discrete Inputs: Input bits; written by the PROFINET PLC
Coils: Output bits or internal data bits, are read by the PROFINET PLC, but can also be written
Input Register: Input word; written by the PROFINET PLC
Holding Register: Output word or internal data word; are read by the PROFINET PLC but can also be
written
All data types are numbered from 0-65535. All data types have their own memory area in the
PN/ModbusTCP coupler:
From the point of view of ModbusTCP communication, all coils, inputs and registers are always available
in the PN/ModbusTCP coupler. So it is always possible to access all data types from address 0-65535.
Via the PROFINET configuration the ModbusTCP data can be assigned to the PLC I/O image in the slots,
which are required in the PLC program. Up to 300 slots are available in the PN/ModbusTCP coupler for
such assignments.
The following modules are available to access the ModbusTCP memory:
Discrete Inputs (PLC writes only):
•Write Discrete Inputs 1 – 32 Bytes (8 – 256 Bits)
Coils (read/write):
•Write Coils 1 - 16 Bytes (8 – 128 Bits)
•Read Coils 1 – 16 Bytes (8 – 128 Bits)
Input Register (PLC writes only):
•Write Input Register (16 Bit)

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Holding Registers (read/write):
•Write Holding Register (16 Bit)
•Read Holding Register (16 Bit)
All modules have as parameter the register number (Input Register, Holding Register) or the first bit
address (Discrete Inputs, Coils).
6.1 Example of a configuration
6.2 Supported ModbusTCP function codes
The PN/ModbusTCP Coupler supports the following function codes:

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7Configuration in the TIA-Portal
Add the PN/ModbusTCP coupler to the project and connect the coupler to the PROFINET network.
Assign a device name and check the IP address on the PROFINET network (X1) for the device.
7.1 Parameters of the PN/ModbusTCP Coupler
The parameterization of the PN/ModbusTCP Coupler can be done completely via the PROFINET
hardware configurator. However, some parameters for the ModbusTCP network (X2) can optionally also
be set via the web page, e.g. the IP address of the ModbusTCP server or the DHCP host name.

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ModbusTCP IP-address mode: Setting the IP address for the ModbusTCP network. Selectable are
"DHCP", "Static IP", "use IP from the web page setting".
Static IP address: If the address mode is set to "Static IP", the static IP address can be specified here.
Static IP subnet mask: If the address mode is set to "Static IP", the subnet mask can be specified here.
DHCP hostname mode: The host name of the device can be set in the PROFINET configuration or on
the web page.
DHCP hostname: DHCP name of the device
ModbusTCP port: Port on which the ModbusTCP driver listens. Port 502 is always active, even if another
port is set here.
Connection watchdog time (ms): Time in which a ModbusTCP connection is closed when there is no
more communication over that connection. Range: 1 - 65535 ms
Maximum ModbusTCP connections:Maximum number of nodes that can establish simultaneous
connections with the PN/ModbusTCP coupler.
Register for PROFINET-Status: Number of the register from which the status of the PN/ModbusTCP
coupler can be read out via ModbusTCP. Range 0-65535
Status Webpage:On which network interfaces should the web page be displayed.
MQTT Publisher Option: On which network interfaces should the MQTT Publisher be activated (see
Chap. 10).
Diagnostic at PS1/PS2 failure:In case of power supply failure at PS1/PS2 a diagnosis is sent to the PLC.

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7.2 Configure ModbusTCP modules
For the data exchange between the ModbusTCP memory in the coupler and the PLC EA memory up to
300 modules can be plugged in the PROFINET configuration of the coupler. Now insert the desired
modules for Discrete Inputs, Coils, Input Registers or Holding Registers into the slots.
All modules have as parameter the register number (Input Register, Holding Register) or the first bit
address (Discrete Inputs, Coils). For the Input Bits and Coils from 8 bits (1 byte) up to 256 bits (32 bytes)
can be addressed together in one slot.
Addressing of single bits is not possible via the PROFINET PLC, the smallest amount is a byte (8 Bits).
However, the bit address can start at any position in the address space of the coils or discrete inputs, so it
does not have to be divisible by 8.
Access to the same memory area by two modules is not permitted. There must be no gap in
the configuration of the slots.