Xylem Sensus Modbus RTU Manuale utente

User Manual

Modbus RTU

Option module for PolluTherm

M H 6123 INT, page 1

1. Use of the option module

The Modbus RTU option module is used to connect the PolluTherm heat meters

to Modbus RTU network using EIA-485 channel.

Picture 1: Modbus RTU module

The module is based on Modbus RTU Slave protocol which is realized according to newest specifications

published by Modbus. The module EIA-485 network interface is compliant to TIA/EIA-485 standard.

1.1. Power supply

The Modbus RTU module should be powered by AC or DC (polarity insensitive) SELV power supply only.

SELV Power Supply Voltage 12-24 V AC/DC ±10%

Power Supply Terminals 60 and 61 (polarity insensitive)

Power Consumption max. 0.6 W

Typical Supply Current 32 mA @12 V DC

1.2. Communication interface

Connection to Modbus RTU network is realized by using galvanic isolated EIA-485 network interface.

Communication Protocol Modbus RTU

Network Polarity 90 (non-inverting, +) and 91 (inverting, -)

Transmission Speed/Baud Rate (bits per second) 1200, 2400, 4800, 9600, 14400, 19200,

38400, 56000, 57600, 115200

Data Format 8E1 (8 data bits, even parity bit, 1 stop bit),

8O1 (8 data bits, odd parity bit, 1 stop bit),

8N1 (8 data bits, none parity bit, 1 stop bit),

8N2 (8 data bits, none parity bit, 2 stop bits)

Galvanic Isolation between Network and Option Module 299 V

RMS

(0-60 Hz)

Number of Devices per EIA-485 Segment Channel Up to 256 (⅛UL)

EIA-485 Network Topology Bus Topology

EIA-485 Segment Channel Length 1200 m

The default communication parameters are: 9600 bps baud rate, 8N1 data format, Modbus Slave ID – 1.

Use only the dedicated two terminators on both ends of EIA-485 network channel segment. In case of any

question, please contact technical support.

1.3. Environmental requirements

Operating Temperature (ambient) +5 to +50°C

Storage Temperature -10 to +65°C

Operating and Storage Humidity 25 to 90 % RH @50°C, non-condensing

User Manual

Modbus RTU

Option module for PolluTherm

M H 6123 INT, page 2

2. Safety instructions

The installation, electrical connection and commissioning the module should be made

by qualified specialists only.

The Modbus RTU option modules may only be used for the PolluTherm meters

otherwise the modules or the heat meter could be damaged.

The included lithium battery and the meter battery must not be recharged,

short-circuited, put in contact with water or exposed to temperatures of more than 80°C.

Battery and module waste may only be disposed at suitable collection centers

for professional waste disposal.

The communication modules are delivered in the form of circuit board. Is highly

recommended that normal static precautions be taken in handling and assembly of this

module to prevent damage and/or degradation which may be induced by ESD. Failure

to observe proper handling and installation procedures can cause damage. ESD

damage can range from subtle performance degradation to complete device failure.

3. Installation the option module in the Modbus RTU network

3.1. Status LED and Status Button functionality

The placement of the Status LED and Status Button is shown on the picture below.

Picture 2: Status Button and Status LED placement on the Modbus RTU option module

Status LED is signalizing every Modbus RTU communication event. Status LED is blinking on during request

receiving and response sending.

Press the button, then power on the module and hold the button pushed longer than 15 seconds to reset

device to factory settings (set Modbus Slave ID to default value 1, the Update Rate parameter to default

value 10 min and the communication interface to the defaults parameters – 9600 bps baud rate and 8N1

data format).

Status Button Status LED

User Manual

Modbus RTU

Option module for PolluTherm

M H 6123 INT, page 3

4. Modbus data register list

Designation Modbus

Modbus

Address

Data Value

Range

Unit

Read only (RO)

Read/write (R/W)

Firmware

Version

30001 or 40001 Input or Holding 0 Uint16 - RO

Energy 30002 or 40002 Input or Holding 1 Int32

kWh, MWh,

MJ, GJ

Energy

(Unit factor)

30004 or 40004 Input or Holding 3 UInt16 RO

Energy (Unit) 30005 or 40005 Input or Holding 4 4 char ASCII RO

Energy (Float) 30007 or 40007 Input or Holding 6 IEEE754 RO

Volume 30009 or 40009 Input or Holding 8 Int32

l (dm

), m

Volume

(Unit factor)

30011 or 40011 Input or Holding 10 UInt16 RO

Volume (Unit) 30012 or 40012 Input or Holding 11 4 char ASCII RO

Volume (Float) 30014 or 40014 Input or Holding 13 IEEE754 RO

Flow 30016 or 40016 Input or Holding 15 Int32

l/h, m

Flow

(Unit factor)

30018 or 40018 Input or Holding 17 UInt16 RO

Flow (Unit) 30019 or 40019 Input or Holding 18 4 char ASCII RO

Flow (Float) 30021 or 40021 Input or Holding 20 IEEE754 RO

Power 30023 or 40023 Input or Holding 22 Int32

W, kW

Power

(Unit factor)

30025 or 40025 Input or Holding 24 UInt16 RO

Power (Unit) 30026 or 40026 Input or Holding 25 4 char ASCII RO

Power (Float) 30028 or 40028 Input or Holding 27 IEEE754 RO

Inlet

temperature

(Fixed)

30030 or 40030 Input or Holding 29 Int16 0.01°C RO

Inlet

temperature

(Float)

30031 or 40031 Input or Holding 30 IEEE754 °C RO

Outlet

temperature

(Fixed)

30033 or 40033 Input or Holding 32 Int16 0.01°C RO

Outlet

temperature

(Float)

30034 or 40034 Input or Holding 33 IEEE754 °C RO

Temperature

difference

(Fixed)

30036 or 40036 Input or Holding 35 Int32 0.001°C RO

Temperature

difference

(Float)

30038 or 40038 Input or Holding 37 IEEE754 °C RO

Tariff Energy 30040 or 40040 Input or Holding 39 Int32

kWh, MWh,

MJ, GJ

Tariff Energy

(Unit factor)

30042 or 40042 Input or Holding 41 UInt16 RO

Tariff Energy

(Unit)

30043 or 40043 Input or Holding 42 4 char ASCII RO

Tariff Energy

(Float)

30045 or 40045 Input or Holding 44 IEEE754 RO

Cooling Energy 30047 or 40047 Input or Holding 46 Int32

kWh, MWh,

MJ, GJ

Cooling Energy

(Unit factor)

30049 or 40049 Input or Holding 48 UInt16 RO

Cooling Energy

(Unit)

30050 or 40050 Input or Holding 49 4 char ASCII RO

Cooling Energy

(Float)

30052 or 40052 Input or Holding 51 IEEE754 RO

Fabrication

Number

30054 or 40054 Input or Holding 53 Int32 - RO

User Manual

Modbus RTU

Option module for PolluTherm

M H 6123 INT, page 4

Designation Modbus

Modbus

Address

Data Value

Range

Unit

Read only (RO)

Read/write (R/W)

Fabrication

Number

30056 or 40056 Input or Holding 55 8 char ASCII - RO

Customer

Location

30060 or 40060 Input or Holding 59 Int32 - RO

Customer

Location

30062 or 40062 Input or Holding 61 8 char ASCII RO

Modbus

Slave ID

3,4

41001 Holding 1000 UInt16 - R/W

Update Rate

Data from

Meter

41002 Holding 1001 UInt16 100 ms R/W

Baud Rate 41003 Holding 1002 UInt32 - R/W

Data Bits

41005 Holding 1004 UInt16 - R/W

Parity

6,7

41006 Holding 1005 UInt16 - R/W

Stop Bits

41007 Holding 1006 UInt16 - R/W

Units for Energy, Volume, etc. are available in (Unit) registers and apply to (Float) values as well as

integer values multiplied by (Unit factor).

Example on Energy registers - assume Energy = 43, Energy (Unit factor) = 100, Energy (Unit) = “Wh”,

Energy (Float) = 4300, then:

Energy register * Energy (Unit factor) register in Energy (Unit) register = 43 * 100 Wh = 4300 Wh

Energy (Float) register in Energy (Unit) register = 4300 Wh

Higher byte of the register is major number of firmware version (0x##00). Lower byte of the register is

minor number of firmware version (0x00##).

Lower byte of this register is Modbus address of the module in the range 1-247 (01-F7 hex).

If the higher byte is set to 1, the Modbus address will be updated to the heat meter M-Bus address.

If the higher byte is set to 0, the Modbus address is static.

Default Update Rate Data from Meter is 4 seconds. Value in Modbus register is 40 because 40 * 100

ms gives 4 seconds.

The registers should be set only the values represent data format on the EIA-485 serial interface

described in chapter Communication interface above.

This register is set by the ASCII char value – ‘E’ for Even parity (69 dec, 45 hex), ‘O’ for Odd parity

(79 dec, 4F hex) and ‘N’ for None parity (78 dec, 4E hex).

More details about Modbus communication and data decoding you find in Modicon Modbus Protocol

Reference Guide and MODBUS over Serial Line - Specification and Implementation Guide documents.

User Manual

Modbus RTU

Option module for PolluTherm

M H 6123 INT, page 5

5. Installation the option module in the calculators

The option module would be installed in the rear socked in the opened meter.

5.1. Opening of the meter

Remove the user seal from the housing of the meter

Open the housing cover

PolluTherm: Press both closing clips on the lower edges of the housing cover and open cover

upwards

Previous versions: Fold away the black locking latch and open housing cover

5.2. PolluTherm

The module has to be plugged in carefully

in the rear socket with the six contacts.

Please make sure that the four pins

of the module are plugged in the four

right contacts of the socket.

The two left contacts remain unused.

Picture 3: installed option module option module in current version of meter

For connection of cables first take the particular rubber form part from the calculator housing and pierce a

hole with a small screw driver. Then take the relevant cable, put it through the hole and cause a strain relief

with a cable strap (supplied). Connect the wires with the related terminals and put the rubber form part back

in the housing.

Close calculator enclosure afterwards and seal it with the supplied selflock-seal.

5.3. Previous versions of PolluTherm

The module has to be plugged in carefully

in the rear socket with the four contacts.

Picture 4: installed option module in previous version of meter

Each cable has to be put through a free cable gland and connected with the related terminals of the module.

Close the calculator housing afterwards and seal it with the supplied selflock-seal.

Rear socket, usage of the four right contacts

Rear socket

User Manual

Modbus RTU

Option module for PolluTherm

M H 6123 INT, page 6

6. Option module firmware changes list

Firmware version Description

2.1 Fixed readout timeouts when Slave ID based on heat meter M-Bus address option

was turned on.

Fixed lack of communication with the module when Slave ID based on heat meter

M-Bus address option was turned on.

Fixed always setting Slave ID based on heat meter M-Bus address option to on,

after restartin

the power suppl

2.0 Added support to update Baud Rate and Data Format (Data Bits, Parity, Stop Bits).

Added support to read Customer Location and Fabrication Number as numbers.

Added support to set Slave ID based on heat meter M-Bus address.

Changed Temperature Difference (Fixed) precision to 0.001°C.

Changed the default Update Rate from 15s to 4s.

Changed the default EIA-485 interface data format to 8N1 (8 data bits, none parity bit,

1 stop bit).

1.0 Initial version.

All trademarks are the property of their respective owners.

Edition: 002 • 09-2018 (030-0005-01A)

Subject to changes without notice

Sensus GmbH Ludwigshafen

Industriestraße 16

D-67063 Ludwigshafen

Phone: + 49 (0) 621 6904-1000

Certified according to ISO 9001 Fax: + 49 (0) 621 6904-1409

Quality Management System Quality Austria Reg.no. 3496/0 E-Mail: [email protected]

www.sensus.com

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