Siemens QBM97 Series User manual

Modbus air pressure sensor with I/O extension
QBM97..
User Guide
A6V11478123_en_a
Building Technologies
2019
-02-01

Siemens
A6V11478123_en_a
Building Technologies
2019-02-01
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Contents
Legal note .............................................................................................................3
Safety notes in the data sheet ...................................................................................3
1 Installation ...................................................................................................4
1.1 Mounting..........................................................................................................4
1.1.1 Dimensions ......................................................................................5
1.2 Quick release fasteners and detached cover..................................................6
1.3 Connecting tubes ............................................................................................7
1.4 Wiring ..............................................................................................................8
1.4.1 Electrical grounding .........................................................................8
1.4.2 Power supply ...................................................................................9
1.4.3 Signal wiring...................................................................................10
2 Commissioning..........................................................................................12
2.1 Addressing ....................................................................................................12
2.1.1 DIP switches (Climatix and other controllers)................................12
2.1.2 On-event addressing (Climatix controllers)....................................13
2.1.3 Baud rate .......................................................................................13
2.2 Fault detection, correction or reset................................................................14
3 Engineering ...............................................................................................15
3.1 Implementing volume flow measurement......................................................15
3.2 Modbus registers...........................................................................................16
4 Maintenance..............................................................................................20
4.1 Zero reset ......................................................................................................20
5 Additional information ................................................................................21

Legal note
Safety notes in the data sheet
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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 in 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. Observe all local and currently valid 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 on a regular basis and any
required corrections are added to the next edition.
Safety notes in the data sheet
NOTICE
Comply with all safety notes in data sheet A6V11478118 in the sections
"Technical data" and "Notes".
Legal note concept
Qualified personnel
Proper use
Exemption from liability

Installation
Mounting
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1Installation
1.1 Mounting
NOTICE
Tip
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
All measurements in millimeters
134
5.5
min. 75
q

Installation
Mounting
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1.1.1 Dimensions
QBM97.. (all dimensions in mm)
Front view QBM97.. (here: without M12) Side view QBM97.. (here: without M12)
Bottom view QBM97.. (opened cover) AQB9120/101A and AQB9220/101A
81.9
45
35.5
5.5
146
134
60
42
33
11.3
910
151.4
175
56
70
28
4
6
3.4
16
6.5
60
78.5
16
100
40
6
1 - 4

Installation
Quick release fasteners and detached cover
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1.2 Quick release fasteners and detached cover
●Open the housing with the quick release fasteners
●The cover can easily be detached completely
1
1
2
90°
2
2
1

Installation
Connecting tubes
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1.3 Connecting tubes
Connect the tubes Avoid loops

Installation
Wiring
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1.4 Wiring
1.4.1 Electrical grounding
Note the following grounding situation of the QBM97.
●QBM97 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 QBM97 are connected to the same power source,
take care to avoid miswiring between 24 V input and GND
The document "Modbus communication" (J3960) provides profound information
on Modbus grounding.
Transformer
Power-
supply
24V
≂
0V
REF B-A+
Earth
Sensor module
Not isolated RS485
M
Situation
Consequences

Installation
Wiring
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1.4.2 Power supply
Terminal 24V≂ →, ,24V≂ ←
Diagram
Note Earth is optional.
24V 24V

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Wiring
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1.4.3 Signal wiring
The following graphics illustrate all signal types of a QBM97.
1.4.3.1 Analog inputs
Analog inputs for passive sensors
Use Connecting passive temperature sensors.
Signal types: Pt1000, LG-Ni1000, NTC10k and Ni1000
Terminal AI1, AI2
Diagram
Analog inputs for voltage signal
Use Connecting devices that supply a 0…10 V signal
Terminal AI1, AI2
Diagram
AI1
AI2
AI1
AI2
==

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Wiring
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1.4.3.2 Analog outputs
Analog outputs with voltage signal
Use Connecting devices that are controlled with a 0...10 V signal
Terminal AO1, AO2
Diagram
M
+
-
M
AO1
AO2
+
-

Commissioning
Addressing
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2Commissioning
2.1 Addressing
2.1.1 DIP switches (Climatix and other controllers)
Use DIP switches for adjustment of 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 of 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.
●Even if the addressing is done with "On-event addressing (Climatix controllers)
[➙ 13]", the termination has to be done manually.
1 2 3 4 5 6 7 8 9
1
2
1: On
0: Off
128 64 32 16 8 4 2 1
1 2 3 4 5 6 7 8 9
1
2
1: On
0: Off
128 64 32 16 8 4 2 1
1 2 3 456 7 8 92
1: On
0: Off

Commissioning
Addressing
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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 QBM97.. 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 therefore necessary functional block is available in the CAS library V2.22
and higher, and AHU application V4.0 and higher. The CAS library online help
contains further engineering documentation.
1. Press and hold the push button for 5...10 seconds.
2. As soon the button is released the status LED lights up orange.
The QBM97.. receives temporarily address 246, so that a communication
can be established.
Automatic baud rate recognition is done.
Format changes to 1-8-E-1.
Master writes the Modbus parameters.
Master writes '1' into register 4x0768 ("Bus config command").
3. QBM97.. gets its final Modbus address by the application/HMI. Further settings
are made automatically (see engineering background below).
After a successful pairing the status LED blinks green (normal mode).
NOTICE
●On-event addressing is active for a maximum of 10 minutes.
●Modbus line termination has to be set with the DIP switches. See "DIP
switches (Climatix and other controllers) [➙ 12]".
2.1.3 Baud rate
The default value of the QBM97.. Modbus baudrate is "Auto". That means the
QBM97.. takes over the baud rate of the calling device.
The first connection to the QBM97.. can last up to 30 seconds (to process the
auto baud function).

Commissioning
Fault detection, correction or reset
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2.2 Fault detection, correction or reset
Detect and correct faults
●The status LED blinking red indicates a failure or wrong configuration
●Read out Error Code (register 4x0002) value 0…11 (see table below)
●Further information contain
–Status register of pressure sensor
–Status register of universal inputs
Value
Error code (register
4x0002)
Reliability pressure
sensor (register 4x0004
+ 4x0006)
Reliability analog
inputs (register
4x0008 + 4x0010)
0 no error no error no error
1 no sensor disruption in operation sensor not
connected
2 overload overload temperature >
150ºC
3 underload negative pressure temperature < -
50ºC
4 open loop
5 short time overload short time overload
6 no output signal
7 other error zero point reset required
8 calculation error
9 extended error
10 EEPROM
protection active
11 configuration error configuration error configuration error
Reset to factory setting
Use the push button to do a reset to factory setting. The Sensor is reset to
delivered setting. Factory settings are listed in the register list "Modbus registers
[➙ 16]" – default values.
Hold the push button for 20…30 seconds.

Engineering
Implementing volume flow measurement
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3Engineering
3.1 Implementing volume flow measurement
In addition to normal (differential) pressure measurement, the QBM97.. provides
volume flow measurement (f.e. used with 3rd party controllers).
Flow is a volume per time. It is related to differential pressure according to the
following formula:
Flow measurement with QBM97.. is set up in an application as follows:
1. Write vendor specific k factor of the measured device into register 4x0083
(sensor 1) and/or 4x0093 (sensor 2). Permitted range 0…1500.
2. Select requested unit in register 4x0084 (sensor 1) and/or 4x0094 (sensor 2).
Selectable are m3/h, m3/s or l/s.
QBM97.. calculates the flow value.
3. Read out the flow value from registers 4x0081/4x0082 (flow low/flow high of
sensor 1) resp. registers 4x0091/4x0092 (flow low/flow high of sensor 2).
The two registers exist because of mathematical reasons: The QBM97.. works with
a high 16 bit and a low 16 bit register.
●Value in register "flow high" = 12
●Value in register "flow low" = 35012
Calculation:
12*65536 = 786432
786432 + 35012 = 821444
With scaling (0.01) the end value = 8214.44m3/h.
Value in registers
Example

Engineering
Modbus registers
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3.2 Modbus registers
Supported function codes
03 (0x03) Read holding register
04 (0x04) Read input registers
06 (0x06) Write single register
16 (0x10) Write multiple registers
Any changes of settings are completed with setting 4x0768 (Bus config
command) to "1" (toggle bit).
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0001 Type 1 R 9710 = 1 x 1250Pa
9720 = 1 x 2500Pa
9750 = 1 x 5500Pa
9770 = 1 x 7000Pa
9711 = 2 x 1250Pa
9712 = 1 x 1250Pa + 1 x 2500Pa
9717 = 1 x 1250Pa + 1 x 7000Pa
9722 = 2 x 2500Pa
9777 = 2 x 7000Pa
uint16_t
4x0002 Error Code 1 R uint16_t
4x0003 Analog output coupling 1 R/W 0 = analog output coupled with differential
pressure sensors = default
1 = analog output coupled as defined in
4x0028/4x0058 (setpoint)
uint16_t
4x0004 Differential pressure 1- Reliability 1 R uint16_t
4x0005 Differential pressure 1 - Value see config. R uint16_t
4x0006 Differential pressure 2 - Reliability 1 R uint16_t
4x0007 Differential pressure 2 - Value see config. R uint16_t
4x0008 Analog input 1 - Reliability 1 R uint16_t
4x0009 Analog input 1 - Value °C / mV 0.1 / 1 R int16_t
4x0010 Analog input 2 - Reliability 1 R uint16_t
4x0011 Analog input 2 - Value °C / mV 0.1 / 1 R int16_t

Engineering
Modbus registers
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Analog Input 1
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0020 Reliability 1 R uint16_t
4x0021 Value °C / mV 0.1 / 1 R int16_t
4x0022 Sensortype AI1 1 R/W 0 = no Sensor (default)
1 = PT1000
2 = LG-Ni 1000
3 = NTC 10k
4 = NI 1000
5 = 0…10V
uint16_t
Analog Output 1
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0027 Value mV 1 R/W 0 ≤ VAL ≤ 10500 uint16_t
4x0028 Dependence 1 R/W 0 = value @ 4x0027 = default if 4x0003=1
1 = with Analog input 1
2 = with Analog input 2
3 = with pressure sensor 1 = default if
4x0003=0
4 = with pressure sensor 2
uint16_t
4x0029 Scaling low - (0.0V) mV 1 R/W 0 ≤ VAL < Scaling high (0 = default) uint16_t
4x0030 Scaling high - (10.0V) mV 1 R/W Scaling low < VAL (10000 = default) uint16_t
Differential pressure 1
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0035 Reliability 1 R uint16_t
4x0036 Value 1 R uint16_t
4x0037 Unit 1 R/W 0 = Pa = (default)
1 = PSI
2 = mmHG
3 = mmH2O
uint16_t
4x0038 Value [Pa] Pa 1 R uint16_t
4x0039 Value [PSI] PSI 0.0001 R uint16_t
4x0040 Zero point calibration 1 R/W 0 = no action (toggle bit)
1 = zero point calibration P1+P2
2 = zero point calibration P1
3 = zero point reset to factory setting
P1+P2
4 = zero point reset to factory setting P1
uint16_t
4x0041 Sensor 1 full scale value Pa 1 R uint16_t
4x0042 Average 500 ms see config #4x0037 R uint16_t
4x0043 Average 1000 ms see config #4x0037 R uint16_t
4x0044 Average 4000 ms see config #4x0037 R uint16_t
4x0045 Average 16000 ms see config #4x0037 R uint16_t

Engineering
Modbus registers
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Analog Input 2
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0050 Reliability 1 R uint16_t
4x0051 Value °C/mV 0.1/1 R int16_t
4x0052 Sensortype AI2 1 R/W 0 = no Sensor (default)
1 = PT1000
2 = LG-Ni 1000
3 = NTC 10k
4 = NI 1000
5 = 0…10V
uint16_t
Analog Output 2
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0057 Value mV 1 R/W 0 ≤ VAL ≤ 10000 uint16_t
4x0058 Dependence 1 R/W 0 = value @ 4x0057 = default if 4x0003=1
1 = with Analog input 1
2 = with Analog input 2
3 = with pressure sensor 1
4 = with pressure sensor 2 = default if
4x0003=0
uint16_t
4x0059 Scaling low - (0V) mV 1 R/W 0 ≤ VAL < Scaling high (0 = default) uint16_t
4x0060 Scaling high - (10V) mV 1 R/W Scaling low < VAL (10000 = default) uint16_t
Differential pressure 2
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0065 Reliability 1 R uint16_t
4x0066 Value 1 R uint16_t
4x0067 Unit 1 R/W 0 = Pa = default
1 = PSI
2 = mmHG
3 = mmH2O
uint16_t
4x0068 Value [Pa] Pa 1 R uint16_t
4x0069 Value [PSI] PSI 0.0001 R uint16_t
4x0070 Zero point calibration 1 R/W 0 = no action (toggle bit)
1 = zero point calibration P1+P2
2 = zero point calibration P2
3 = zero point reset to factory setting
P1+P2
4 = zero point reset to factory setting P2
uint16_t
4x0071 Sensor 2 full scale value Pa 1 R uint16_t
4x0072 Average 500 ms see config #4x0067 R uint16_t
4x0073 Average 1000 ms see config #4x0067 R uint16_t
4x0074 Average 4000 ms see config #4x0067 R uint16_t
4x0075 Average 16000 ms see config #4x0067 R uint16_t

Engineering
Modbus registers
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Flow (Diff-pressure Sensor 1)
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0081 Flow low 0.01 R uint16_t
4x0082 Flow high 0.01 R uint16_t
4x0083 k factor 1 R/W 0 ≤ VAL ≤ 1500 uint16_t
4x0084 Unit 1 R/W 0 = m3/h (default)
1 = m3/s
2 = l/s
uint16_t
Flow (Diff-pressure Sensor 2)
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0091 Flow low 0.01 R uint16_t
4x0092 Flow high 0.01 R uint16_t
4x0093 k factor 1 R/W 0 ≤ VAL ≤ 1500 uint16_t
4x0094 Unit 1 R/W 0 = m3/h (default)
1 = m3/s
2 = l/s
uint16_t
Modbus Settings
(according to Climatix)
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x0764 Modbus address 1 R/W 1 ≤ VAL ≤ 247
255 = default
uint16_t
4x0765 Baudrate 1 R/W 0 = auto (default)
1 = 9600
2 = 19200
3 = 38400
4 = 57600
uint16_t
4x0766 Format 1 R/W 0 = 1-8-E-1 (default)
1 = 1-8-O-1
2 = 1-8-N-1
3 = 1-8-N-2
uint16_t
4x0768 Bus config command 1 R/W 0 = ready (default)
1 = load
2 = discard
uint16_t
Addr
Description
Unit
Scaling
R/W
Range
Data type
4x9014 Software version 1 R uint16_t

Maintenance
Zero reset
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4Maintenance
4.1 Zero reset
Perform the zero reset without tubes Afterwards connect the tubes again
NOTICE
Use cases of the zero reset
●As the allowed mounting position is vertical only (see "Mounting [➙ 4]") the
sensor does not have to be recalibrated during commissioning in the case of
normal pressure measurement.
●Only in case of relative pressure measurement (pressure nipple "-" connected
to ambient atmosphere) a zero point calibration is recommended during
commissioning.
10...20 s
Blue