STIEBEL ELTRON Modbus TCP/IP Software Extension for Internet Service Gateway User Guide

General information

These instructions are intended for qualified contractors.

Note
Read these instructions carefully before using the appliance and retain them for future reference.
Pass on the instructions to a new user if required.

Other symbols in this documentation

Note
General information is identified by the adjacent symbol.

• Read these texts carefully.

Symbol:  Meaning

Material losses (appliance damage, consequential losses and environmental pollution)

• This symbol indicates that you have to do something. The action you need to take is described step by step.

Relevant appliances

• ISG web, part number 229336
• ISG plus, part number 233493

Brand conformity

Note
This software can only be operated in conjunction with devices and software from the same manufacturer.

• Never use this software in conjunction with third party software or devices.

Relevant documents

Operating and installation instructions Internet Service Gateway ISG web

Operating and installation instructions for the connected integral ventilation unit or the heat pump

Conditions of use for the ISG web

Contract conditions for the purchase of chargeable software extensions with additional functions for the ISG web

Safety

Intended use

Material losses
Incorrect use can result in damage to the connected integral ventilation unit or heat pump.

Observation of these instructions and of instructions for any accessories used is also  part of the correct use of this appliance.

System requirements

• ISG web with the Basic service package
• Compatible device, see “Compatibility overview”
• Building management system with Modbus TCP/IP Master
• IP network connection to the ISG and to the building management system

General safety instructions

We guarantee trouble-free function and operational reliability only
if the original accessories intended for the appliance are used.

Instructions, standards and regulations

Note
Observe all applicable national and regional regulations and instructions.

Product description

This product is a software interface for the ISG for building automation. The ISG is a gateway for controlling integral ventilation units and heat pumps. Components required for operating the connected integral ventilation unit or the connected heat pump (e.g. sensors) cannot be replaced by Modbus components.

The following functions are available with the Modbus software:

• Selecting operating modes
• Selecting set temperatures
• Switching fan levels
• Selecting set DHW temperature
• Calling up current values and system data

Settings

The ISG uses the following 16-bit register:

“Read input register”

• Objects are read-only
• Calling up registers via function code 04 (“Read input registers”)
  Example: To read register 30501, address 501 is brought up with function code 04.

“Read/write holding register”

• Objects are read-writable
• Calling up registers via function code 03 (“Read holding registers”)
• Write via function code 06 (“Write single register”) or function code 16 (“Write multiple registers”)

The substitute value “32768 (0x8000H)” is issued for unavailable objects.

Some status objects are bit-coded (B0 – Bx). The respective corresponding status information is documented under “Coding” (e.g. compressor running yes/no).

A distinction is drawn here between the following types of data:

Data type	Value range	Multiplier for reading	Multiplier for writing	Signed	Step size 1	Step size 5
2	3276.8 to 3276.7	0.1	10	Yes	0.1	0.5
6	0 to 65535	1	1	No	1	1
7	-327.68 to 327.67	0.01	100	Yes	0.01	0.05
8	0 to 255	1	1	5	1	5

• Transferred value x multiplier = data value
• Example – writing: To write a temperature of 20.3 °C, write value 203 (factor 10) to the register.
• Example – reading: The value 203 called up means 20.3 °C (203 x 0.1 = 20.3)

IP configuration

Note
Refer to the ISG operating and installation instructions.

You can perform the IP configuration in the SERVICEWELT via the “Profile” tab:

ISG: 192.168.0.126 (standard IP address)
TCP port: 502
Slave ID: 1 (permanent)

Note
The ISG retains its standard IP address when directly connected to your computer. If connected via a router, the DHCP server automatically assigns a different IP address to the ISG.

Compatibility overview

Note
In parameter configuration, first select the appliance type so that the respective corresponding parameters can be configured.

• Follow the operating and installation instructions for the ISG when connecting the heat pump or the integral ventilation unit to the ISG.

Note
Generally, all listed appliances are supported.

• Not every object type is available with every appliance.
• The substitute value “32768 (0x8000H)” is issued for unavailable objects.

You can find an overview of compatible heat pumps / integral ventilation units on our website.

https://www.stiebel-eltron.de/de/home/service/smart-home/kompatibilitaetslisten.html

Incompatibility

• The ISG must not be operated together with a DCo-active GSM on the same CAN bus. This can result in errors in communication with the WPM.
• The Modbus TCP/IP software interface cannot be combined with other ISG software interfaces (Exception: Read-only access is possible at the same time as using the EMI energy management software extension).

Troubleshooting

Checking the software version

• Check whether the Modbus software is installed on the ISG.
• When a WPM is connected, you will find the corresponding menu in the SERVICEWELT under: DIAGNOSIS → SYSTEM → ISG.
• When an integral ventilation unit is connected, you will find the corresponding menu in the SERVICEWELT under: DIAGNOSIS → BUS SUBSCRIBER → ISG.
• If the “Modbus TCP/IP” interface is not listed, you need to update to the latest ISG firmware.
• Contact STIEBEL ELTRON service department.
• Visit our homepage for more information.

Checking the data transfer:

• Using a standard data object (e.g. outside temperature), check the data transfer via Modbus. Compare the transferred value with the value shown in the controller display

Note
ISG addresses are 1 based.
Allowance must be made for an offset of around 1, depending on the configuration.

Acknowledging faults:

• Faults in the heating system are indicated by the fault status (Modbus addresses: 2504, 2002).
• For safety reasons, faults can only be acknowledged via the SERVICEWELT user interface.

If you encounter problems with the product and cannot remedy the cause, contact an IT contractor.

Modbus system values for heat pumps with WPM

Note
Generally, all listed appliances are supported.

• Not every object type is available with every appliance.
• The substitute value “32768 (0x8000H)” is issued for unavailable objects.
• ISG addresses are 1 based.

Note
Values in the “Min. value” and “Max. value” columns will vary according to the connected heat pump, and may deviate from the indicated values.

Block 1: System values (Read input register)

Modbus address

Object designation

WPMsys- tem

WPM 3

WPM 3i

Comments

Min. value

Max. value

Data type

Unit

Write/ read (w/r)

501

ACTUAL TEMPERATURE FE7

x

x

x

2

°C

r

502

SET TEMPERATURE FE7

x

x

x

2

°C

r

503

ACTUAL TEMPERATURE FEK

x

x

2

°C

r

504

SET TEMPERATURE FEK

x

x

2

°C

r

505

RELATIVE HUMIDITY

x

x

2

%

r

506

DEW POINT TEMPERATURE

x

x

-40

30

2

°C

r

507

OUTSIDE TEMPERATURE

x

x

x

-60

80

2

°C

r

508

ACTUAL TEMPERATURE HK 1

x

x

x

0

40

2

°C

r

509

SET TEMPERATURE HK 1

x

0

65

2

°C

r

510

SET TEMPERATURE HK 1

x

x

0

40

2

°C

r

511

ACTUAL TEMPERATURE HK 2

x

x

x

0

90

2

°C

r

512

SET TEMPERATURE HK 2

x

x

x

0

65

2

°C

r

513

ACTUAL FLOW TEMPERATURE WP

x

x

x

MFG, if available

2

°C

r

514

ACTUAL FLOW TEMPERATURE NHZ

x

x

x

MFG, if available

2

°C

r

515

ACTUAL FLOW TEMPERATURE

x

x

x

2

°C

r

516

ACTUAL RETURN TEMPERATURE

x

x

x

0

90

2

°C

r

517

SET FIXED TEMPERATURE

x

x

x

20

50

2

°C

r

518

ACTUAL BUFFER  TEMPERATURE

x

x

x

0

90

2

°C

r

519

SET BUFFER TEMPERATURE

x

x

x

2

°C

r

520

HEATING PRESSURE

x

x

x

MFG, if available

7

bar

r

521

FLOW RATE

x

x

x

MFG, if available

2

l/min

r

522

ACTUAL TEMPERATURE

x

x

x

DHW

10

65

2

°C

r

523

SET TEMPERATURE

x

x

x

DHW

10

65

2

°C

r

524

ACTUAL TEMPERATURE  FAN

x

x

x

Cooling

2

K

r

525

SET TEMPERATURE FAN

x

x

x

Cooling

7

25

2

K

r

526

ACTUAL TEMPERATURE AREA

x

x

x

Cooling

2

K

r

527

SET TEMPERATURE AREA

x

x

x

Cooling

2

K

r

528

COLLECTOR TEMPERATURE

x

Solar thermal

0

90

2

°C

r

529

CYLINDER TEMPERATURE

x

Solar thermal

0

90

2

°C

r

530

RUNTIME

x

Solar thermal

6

h

r

531

ACTUAL TEMPERATURE

x

x

External heat source

10

90

2

°C

r

532

SET TEMPERATURE

x

x

External heat source

2

K

r

533

APPLICATION LIMIT HZG

x

x

x

Lower heating limit

-40

40

2

°C

r

534

APPLICATION LIMIT WW

x

x

x

Lower DHW limit

-40

40

2

°C

r

535

RUNTIME

x

x

External heat source

6

h

r

536

SOURCE TEMPERATURE

x

x

x

2

°C

r

537

MIN SOURCE TEMPERATURE

x

x

x

-10

10

2

°C

r

538

SOURCE PRESSURE

x

x

x

7

bar

r

539

HOT GAS TEMPERATURE

x

2

°C

r

540

HIGH PRESSURE

x

2

bar

r

541

LOW PRESSURE

x

2

bar

r

542

RETURN TEMPERATURE

x

x

Heat pump 1

2

°C

r

543

FLOW TEMPERATURE

x

x

Heat pump 1

2

°C

r

544

HOT GAS TEMPERATURE

x

x

Heat pump 1

2

°C

r

545

LOW PRESSURE

x

x

Heat pump 1

7

bar

r

546

MEAN PRESSURE

x

x

Heat pump 1

7

bar

r

547

HIGH PRESSURE

x

x

Heat pump 1

7

bar

r

548

WP WATER FLOW RATE

x

x

Heat pump 1

2

l/min

r

549

RETURN TEMPERATURE

x

x

Heat pump 2

2

°C

r

550

FLOW TEMPERATURE

x

x

Heat pump 2

2

°C

r

551

HOT GAS TEMPERATURE

x

x

Heat pump 2

2

°C

r

552

LOW PRESSURE

x

x

Heat pump 2

7

bar

r

553

MEAN PRESSURE

x

x

Heat pump 2

7

bar

r

554

HIGH PRESSURE

x

x

Heat pump 2

7

bar

r

555

WP WATER FLOW RATE

x

x

Heat pump 2

2

l/min

r

556

RETURN TEMPERATURE

x

x

Heat pump 3

2

°C

r

557

FLOW TEMPERATURE

x

x

Heat pump 3

2

°C

r

558

HOT GAS TEMPERATURE

x

x

Heat pump 3

2

°C

r

559

LOW PRESSURE

x

x

Heat pump 3

7

bar

r

560

MEAN PRESSURE

x

x

Heat pump 3

7

bar

r

561

HIGH PRESSURE

x

x

Heat pump 3

7

bar

r

562

WP WATER FLOW RATE

x

x

Heat pump 3

2

l/min

r

563

RETURN TEMPERATURE

x

x

Heat pump 4

2

°C

r

564

FLOW TEMPERATURE

x

x

Heat pump 4

2

°C

r

565

HOT GAS TEMPERATURE

x

x

Heat pump 4

2

°C

r

566

LOW PRESSURE

x

x

Heat pump 4

7

bar

r

567

MEAN PRESSURE

x

x

Heat pump 4

7

bar

r

568

HIGH PRESSURE

x

x

Heat pump 4

7

bar

r

569

WP WATER FLOW RATE

x

x

Heat pump 4

2

l/min

r

570

RETURN TEMPERATURE

x

x

Heat pump 5

2

°C

r

571

FLOW TEMPERATURE

x

x

Heat pump 5

2

°C

r

572

HOT GAS TEMPERATURE

x

x

Heat pump 5

2

°C

r

573

LOW PRESSURE

x

x

Heat pump 5

7

bar

r

574

MEAN PRESSURE

x

x

Heat pump 5

7

bar

r

575

HIGH PRESSURE

x

x

Heat pump 5

7

bar

r

576

WP WATER FLOW RATE

x

x

Heat pump 5

2

l/min

r

577

RETURN TEMPERATURE

x

x

Heat pump 6

2

°C

r

578

FLOW TEMPERATURE

x

x

Heat pump 6

2

°C

r

579

HOT GAS TEMPERATURE

x

x

Heat pump 6

2

°C

r

580

LOW PRESSURE

x

x

Heat pump 6

7

bar

r

581

MEAN PRESSURE

x

x

Heat pump 6

7

bar

r

582

HIGH PRESSURE

x

x

Heat pump 6

7

bar

r

583

WP WATER FLOW RATE

x

x

Heat pump 6

2

l/min

r

584              ACTUAL TEMPERATURE

x

Room temperature, heating circuit 1

2

°C

r

585             SET TEMPERATURE

x

Room temperature, heating circuit 1

2

°C

r

586             RELATIVE HUMIDITY

x

Heating circuit 1

2

%

r

587             DEW POINT TEMPERATURE

x

Heating circuit 1

2

°C

r

588             ACTUAL TEMPERATURE

x

Room temperature, heating circuit 2

2

°C

r

589             SET TEMPERATURE

x

Room temperature, heating circuit 2

2

°C

r

590             RELATIVE HUMIDITY

x

Heating circuit 2

2

%

r

591             DEW POINT TEMPERATURE

x

Heating circuit 2

2

°C

r

592             ACTUAL TEMPERATURE

x

Room temperature, heating circuit 3

2

°C

r

593SET TEMPERATURE

x

Room temperature, heating circuit 3

2

°C

r

594RELATIVE HUMIDITY

x

Heating circuit 3

2

%

r

595DEW POINT TEMPERATURE

x

Heating circuit 3

2

°C

r

596ACTUAL TEMPERATURE

x

Room temperature, heating circuit 4

2

°C

r

597             SET TEMPERATURE

x

Room temperature, heating circuit 4

2

°C

r

598             RELATIVE HUMIDITY

x

Heating circuit 4

2

%

r

599             DEW POINT TEMPERATURE

x

Heating circuit 4

2

°C

r

600             ACTUAL TEMPERATURE

x

Room temperature, heating circuit 5

2

°C

r

601             SET TEMPERATURE

x

Room temperature, heating circuit 5

2

°C

r

602             RELATIVE HUMIDITY

x

Heating circuit 5

2

%

r

603             DEW POINT TEMPERATURE

x

Heating circuit 5

2

°C

r

604             SET TEMPERATURE

x

Room temperature, cooling circuit 1

2

°C

r

605             SET TEMPERATURE

x

Room temperature, cooling circuit 2

2

°C

r

606             SET TEMPERATURE

x

Room temperature, cooling circuit 3

2

°C

r

607             SET TEMPERATURE

x

emperature, cooling circuit4

2

°C

r

608 SET TEMPERATURE

x

oom temperature, cooling circuit 5

2

°C

r

Documents / Resources

STIEBEL ELTRON Modbus TCP/IP Software Extension for Internet Service Gateway [pdf] User Guide Modbus TCP IP Software Extension for Internet Service Gateway, Modbus TCP IP, Software Extension for Internet Service Gateway, Internet Service Gateway

References

• User Manual