Siemens QBM3700 Series Bedienungsanleitung

Modbus Air Pressure Sensor with I/O extension

QBM3700..

User Guide

A6V11841988_en--_b Smart Infrastructure

2021-02-24

2 | 20 A6V11841988_en--_b

Contents

Legal note ............................................................................................................3

Safety notes in the data sheet................................................................................3

1Installation .................................................................................................4

1.1 Mounting .....................................................................................................4

1.2 Quick release fasteners and detached cover................................................5

1.3 Connecting tubes.........................................................................................6

1.4 Wiring..........................................................................................................6

1.4.1 Electrical grounding ......................................................................6

1.4.2 Power supply ................................................................................7

1.4.3 Connection terminals ....................................................................7

1.4.4 Signal wiring .................................................................................8

2Commissioning........................................................................................10

2.1 Address.....................................................................................................10

2.1.1 DIP switches (Climatix and other controllers)...............................10

2.1.2 On-event addressing (Climatix controllers)..................................10

2.1.3 Baud rate....................................................................................11

2.2 Fault detection, correction or reset.............................................................11

3Engineering..............................................................................................13

3.1 Implementing volume flow measurement ...................................................13

3.2 Modbus registers.......................................................................................13

4Maintenance.............................................................................................18

4.1 Fused mode analog outputs.......................................................................18

4.2 Zero reset..................................................................................................18

5Supplemental information.......................................................................19

Legal note

Safety notes in the data sheet

A6V11841988_en--_b 3 | 20

Legal note

This guide includes notes that must be followed for your own personal safety as

well as to prevent damage to property.

Notes dealing only with damage to property do not have the warning triangle and

use the signal word NOTICE and an exclamation point.

The notes are depicted as follows:

NOTICE

Type and source of hazard

Consequences in the event the hazard occurs

●Measures/prohibitions to prevent the hazard

Only qualified personnel may commission the device/system. In this regard,

qualified personnel have the training and experience necessary to recognize and

avoid risks when working with this device/system.

The device/system described here may only be used on building technical plants

and for the described applications only.

The trouble-free and safe operation of the device/system described here requires

proper transportation, correct warehousing, mounting, installation, commissioning,

operation, and maintenance.

You must comply with permissible ambient conditions. You must comply with the

information provided in the Section "Technical data" and any notes in the

associated documentation.

Fuses, switches, wiring and grounding must comply with local safety regulations for

electrical installations. Comply with all local and currently applicable laws and

regulations.

The content of this document was reviewed to ensure it matches the hardware and

firmware described herein. Deviations cannot be precluded, however, so that we

cannot guarantee that the document matches in full the actual device/system. The

information provided in this document is reviewed and updated on a regular basis.

Safety notes in the data sheet

NOTICE

Comply with all safety notes in data sheet "A6V11684000" in the sections

"Technical data" and "Notes".

Legal note concept

Qualified personnel

Intended use

Exemption from liability

Installation

Mounting

4 | 20 A6V11841988_en--_b

1 Installation

1.1 Mounting

NOTICE

Hint

Mount the sensor in a location that is easy to open the cover and access the

terminals, DIP switches and view the LEDs.

Proceed as follows to mount the sensor to a surface:

●Screw the sensor at the 2 brackets (on the device sides) to the mounting

surface.

●Keep the following guidelines

Fig. 1: All dimensions in mm

134

5.5

min. 75

Installation

Quick release fasteners and detached cover 1

A6V11841988_en--_b 5 | 20

1.2 Quick release fasteners and detached cover

●Open the housing with the quick release fasteners

●The cover is easy to remove

90°

Installation

Connecting tubes

6 | 20 A6V11841988_en--_b

1.3 Connecting tubes

Connect the tubes Avoid loops

1.4 Wiring

1.4.1 Electrical grounding

Note the following grounding situation of the QBM3700...

Transformer

Power-

supply

24V 0V

REF B- A+

Earth

Sensor module

Not isolated RS485

Starting point

Installation

Wiring 1

A6V11841988_en--_b 7 | 20

●QBM3700.. uses a non-isolated RS485-Interface.

●The reference of RS485 transceiver is connected to GND.

●All GND pins are on the same potential.

●If the Climatix controller and QBM3700.. are connected to the same power

source, take care to avoid incorrect wiring between 24 V input and GND.

The document "Modbus communication" (J3960) provides profound information

on Modbus grounding.

1.4.2 Power supply

Terminal 24V

≂

→, ,24V

≂

←

Diagram

Note Ground is optional.

1.4.3 Connection terminals

Power supply AC / DC 24 V

GND

Power supply for external devices AC/DC 24 V

Modbus® communication +

Common

Modbus® communication -

Analog output 1

GND

Analog output 2

Analog input 1

GND

Analog input 2

Consequence

Installation

Wiring

8 | 20 A6V11841988_en--_b

1.4.4 Signal wiring

The following graphics illustrate all signal types of a QBM3700...

1.4.4.1 Analog inputs

Analog inputs for passive sensors

Application Connecting passive temperature sensors.

Signal types: Pt1000, LG-Ni1000, NTC10k, and Ni1000

Terminal AI1, AI2

Diagram

Analog inputs for voltage signal

Application Connecting devices that supply a 0…10 V signal

Terminal AI1, AI2

Diagram

AI1

AI2

AI1

AI2

Installation

Wiring 1

A6V11841988_en--_b 9 | 20

1.4.4.2 Analog outputs

Analog outputs with voltage signal

Application Connecting devices that are controlled with a 0...10 V signal

Terminal AO1, AO2

Diagram

Commissioning

Address

10 | 20 A6V11841988_en--_b

2 Commissioning

2.1 Address

2.1.1 DIP switches (Climatix and other controllers)

Use DIP switches to adjust the Modbus address and for termination.

●The DIP-switches have priority over register 4x0764 (Modbus address).

●The Modbus address (register 4x0764) is valid as soon as all DIP switches are

on '0'.

●Changes to DIP switches are effective after 5 seconds.

Modbus addressing

The DIP switches allow addresses between 1…247 (Modbus specification).

The following example shows Modbus address '3':

Modbus termination

●The termination is done with 120 Ω+ 1nF.

●The termination must be done manually, even if the addressing is done with

"On-event addressing (Climatix controllers) [➙10]".

2.1.2 On-event addressing (Climatix controllers)

On-event addressing works together with Climatix controllers.

On-event addressing performs several functions that otherwise would have to be

done 'manually':

Workflow

The QBM3700.. sensor is wired and connected to the controller via Modbus.

The DIPs 1…8 (addressing DIPs) are set to '0'.

The on-event addressing functionality is configured in the application.

The necessary functional block is therefore available in the CAS library. The

CAS library online help contains further engineering documentation.

1 2 3 4 5 6 7 8 9

1: On

0: Off

128 64 32 16 8 4 2 1

1 2 3 4 5 6 7 8 9

1: On

0: Off

128 64 32 16 8 4 2 1

1 2 3 4 5 6 7 8 92

1: On

0: Off

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