Grundfos BACnet for MIXIT User manual

BACnet for MIXIT
Functional profile and user manual
GRUNDFOS INSTRUCTIONS

BACnet for MIXIT
English (GB)
Functional profile and user manual ............................................................4
3
Table of contents

English (GB) Functional profile and user manual
Original functional profile and user manual
Table of contents
1. General information ......................................................................5
1.1 Notes ................................................................................5
1.2 Target group............................................................................5
1.3 Further information........................................................................5
2. Introduction ...........................................................................6
2.1 About MIXIT functional profile .................................................................6
2.2 Definitions and abbreviations .................................................................6
2.3 Specifications for BACnet MS/TP ...............................................................6
2.4 Specifications for BACnet IP ..................................................................7
2.5 Supported services .......................................................................7
2.6 Terminal connections overview ................................................................8
2.7 BACnet device Instance Number ...............................................................9
2.8 Best Practices ..........................................................................9
3. BACnet MS/TP Setup ....................................................................10
3.1 BACnet bus topology .....................................................................10
3.2 Cables for BACnet MS/TP .................................................................. 11
3.3 Configuring BACnet MS/TP ................................................................. 11
4. BACnet IP Setup ....................................................................... 12
4.1 Cables for BACnet IP .....................................................................12
4.2 DATA and Link LED's .....................................................................12
4.3 Configuring BACnet IP ....................................................................12
5. Setting up MIXIT and communicating using BACnet ................................................ 13
5.1 Hello world - starting communication with MIXIT .....................................................13
5.2 Maintaining communication with the MIXIT unit .....................................................13
6. Object overview ........................................................................ 14
6.1 BACnet device object .....................................................................14
6.2 Binary inputs ..........................................................................15
6.3 Binary outputs .........................................................................16
6.4 Binary values ..........................................................................16
6.5 Multistate inputs ........................................................................17
6.6 Multistate outputs .......................................................................17
6.7 Multistate value .........................................................................18
6.8 Analog inputs ..........................................................................18
6.9 Analog Output .........................................................................19
6.10 Analog Valve ..........................................................................19
7. MIXIT overview ........................................................................ 21
7.1 Setpoint chain..........................................................................21
7.2 Thermal mode and application setup............................................................21
7.3 Outdoor temperature compensation (heating) ......................................................23
7.4 Default settings .........................................................................23
7.5 Configuring the pump .....................................................................23
7.6 Limiters..............................................................................24
7.7 Application specific functionality...............................................................24
7.8 Sequence of operation and state machines........................................................25
7.9 Energy Monitor .........................................................................27
7.10 Functionality not available on fieldbus ...........................................................27
8. Fault finding the product ..................................................................28
8.1 The external control icon is not switched on .......................................................28
8.2 Data is read from the MIXIT unit but it is not reacting on a setpoint change ....................................28
8.3 The controlled temperature is much different than the requested temperature for more than 10-20 minutes................. 28
8.4 The MIXIT unit was put into bus control, but it is now in local control again..................................... 28
8.5 The MIXIT unit was stopped from BACnet command, but it has started again ...................................28
8.6 The MIXIT unit does not start the pump when a start signal is given in BO,1.................................... 28
8.7 The MIXIT unit does not stop the pump when a stop signal is given in BO,1 ....................................29
8.8 Reading and resetting warnings and alarms .......................................................29
9. BACnet telegrams ......................................................................30
9.1 BACnet MS/TP telegram overview .............................................................30
9.2 Telegram types .........................................................................30
10. Appendix: overview of pump control mode settings ................................................31
10.1 Setting the duty point for constant-speed control mode.................................................31
10.2 Setting the duty point for constant-pressure control mode ...............................................31
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10.3 Setting the duty point for proportional-pressure control mode .............................................32
10.4 Setting the duty point for constant-flow control mode ..................................................33
1. General information
This functional profile describes Grundfos BACnet MIXIT.
Read this document before you install the product. Installation and operation must comply with local regulations and accepted codes
of good practice.
1.1 Notes
The symbols and notes below may appear in Grundfos installation and operating instructions, safety instructions and service instructions.
Observe these instructions for explosion-proof products.
A blue or grey circle with a white graphical symbol indicates that an action must be taken.
A red or grey circle with a diagonal bar, possibly with a black graphical symbol, indicates that an action must not be taken or must be
stopped.
If these instructions are not observed, it may result in malfunction or damage to the equipment.
Tips and advice that make the work easier.
1.2 Target group
This functional profile assumes that the reader is familiar with the startup and programming of BACnet devices. The reader is required to
have basic knowledge of BACnet protocol and technical specifications. It is also assumed that an existing BACnet MS/TP or BACnet IP
network is present.
1.3 Further information
In the following guide: MIXIT integration guide more detailed information about the application specific functionality can be found. Especially
how use MIXIT in connection with air handling units See MIXIT quick guide, Mini quick guide & I&O
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English (GB)

2. Introduction
2.1 About MIXIT functional profile
The functional profile describes the following modules and units.
• MIXIT BACnet MS/TP
• MIXIT Ethernet for BACnet IP
Grundfos cannot be held responsible for any problems caused directly or indirectly by using information in the functional profile.
2.2 Definitions and abbreviations
APDU Application Protocol Data Unit
ARP Address Resolution Protocol. translate IP addresses into MAC addresses.
CRC Cyclic Redundancy Check. A data error detection method.
Device A BACnet device is typically a controller, gateway, or user interface. Every BACnet device contains a
device object that defines certain device information
DHCP Dynamic Host Configuration Protocol. Used to configure network devices so that they can
communicate on an IP network.
Grundfos GO Remote Grundfos GO Remote is an app for setting up, controlling and monitoring Grundfos products. The
app can be downloaded for free in your preferred app store for both Android and iOS.
MAC Unique network address for a piece of hardware.
MS/TP Master-Slave / Token-Passing. A data protocol used for BACnet RS-485.
Transmission speed Bits transferred per second, bits/s.
Parity
An error checking method. When a message is transmitted, the parity bit is calculated and applied to
the 8 bit data frame of each character transmitted. The receiving device checks the validity of each 8
bit characters frame if an error occurs the complete telegram is discarded.
Line termination resistors Line termination must be connected at each of the two ends of the wire. The MIXIT unit is fitted with
a built-in optional line termination resistor. RS485 network only (MS/TP).
AI (Analog input) Analog inputs, Analog objects with measured values and status information from the product.
AO (Analog output) Analog output, Analog object for setting a new setpoint in the product.
AV (Analog Value) Analog value, Analog objects for configuration of the product.
BI (Binary Input) Binary input, Binary objects that provide information from product.
BO (Binary output) Binary output, Binary objects for control of the product.
BV (Binary Value) Binary value, Binary objects for configuration of the product
MI (Multistate Input) Multistate inputs, Multistate objects that represent the result from an algorithmic process within a
BACnet device as an enumeration (Enum)
MO (Multistate Output) Multistate outputs, Multistate objects that set an enumeration (Enum) value in the product.
MV (Multistate Value) Multistate values, multistate objects for configuration of the product.
2.3 Specifications for BACnet MS/TP
BACnet MS/TP Description Comments
BACnet connector Screw-type terminal 3 pins. AYB
BACnet connection type RS-485
BACnet wire configuration Two wire + Ground Conductors: Plus, Minus and Ground.
Maximum cable length 1200 m Equals 4000 ft.
Recommended cross-section of BACnet cable 0.20 - 0.25 mm2AWG24 or AWG23.
MAC address 0-127 Set via Grundfos GO ("Fieldbus address").
Line termination On or Off Set via DIP switch in the product.
Supported transmission speeds [bits/s] 9600, 19200, 38400, 76800 Set via Grundfos GO.
Data bits 8 Fixed value.
Stop bits 1 Fixed value.
Parity None Fixed value.
Maximum number of BACnet devices 32 This number can be increased using
repeaters.
Grundfos BACnet vendor ID 227
BACnet segmentation support No
Character set support ANSI X3.4 Base definition for the widely used character
code known as ASCII.
BACnet device profile B-ASC BACnet Application-Specific controller.
BACnet MS/TP master Yes The MIXIT unit is a BACnet MS/TP master
device.
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BACnet MS/TP Description Comments
Manual slave address binding No
BACnet protocol revision 15
Max. master range 1-127
2.4 Specifications for BACnet IP
BACnet IP Description comments
Application layer HTTP, BACnet IP
Transport layer UDP
Internet layer Internet protocol V4 (IPv4)
Link layer ARP, media access control
Ethernet cable CAT5, CAT 5e, CAT6
Max. cable length 100 metres at 10/100 Mbit/s
Transmission speed detected 10/100 Mbit/s auto-detected
BACnet protocol revision 15
Max. APDU length 1496 (fixed)
Default UDP port 47808
2.5 Supported services
BACnet Interoperability Building Blocks (BIBBs) are collections of one or more BACnet services. These are described in terms of an "A" and a
"B" device. Both devices are nodes on a BACnet inter-network. In most cases, the "A" device will act as the user of data (client), and the "B"
device will be the provider of this data (server).
The MIXIT unit is a BACnet Application-Specific Controller (BASC) with a few additional services
2.5.1 Data sharing services
Name BACnet BIBB code Description Initiate Execute
ReadProperty DS-RP-B The MIXIT unit can be the provider of data. ‐●
ReadPropertyMultiple DS-RPM-B The MIXIT unit can be the provider of data and return
multiple values at one time. ‐●
WriteProperty DS-WP-B The MIXIT unit allows a value to be changed over the
network. ‐●
WritePropertyMultiple DS-WPM-B The MIXIT unit allows multiple values to be changed
over the network ‐●
SubscribeCOV
DS-COV-B
The MIXIT unit can be the provider of "Change Of Value"
data. The unit supports up to 10 simultaneous COV
subscriptions. Subscription lifetime can be limited or
unlimited.
‐●
ConfirmedCOVNotification ● ‐
UnconfirmedCOVNotification ● ‐
2.5.2 Data management services
Name BACnet BIBB code Description Initiate Execute
Who-Is DM-DDB-A The MIXIT unit can seek information about device attributes of
other devices and interpret device announcements
●‐
I-Am ‐●
Who-Is DM-DDB-B The MIXIT unit can provide information about its device
attributes and respond to requests to identify itself.
●
I-Am ● ‐
Who-Has DM-DOB-B The MIXIT unit can provide address information about their
objects upon request.
●
I-Have ● ‐
DeviceCommunicationControl DM-DCC-B
The MIXIT unit can respond to communication control requests.
It supports both limited and unlimited duration. Password (where
required) is Grundfos.
‐●
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2.6 Terminal connections overview
2
3
51 6 7
4
L
N
NC1 NO1 C1 NC2 NO2 C2 A Y B
531
1197
L
N
NC1 NO1 C1 NC2 NO2 C2 A Y B
531
1197
L
N
NC1 NO1 C1
NC2 NO2 C2
A Y B
531
1197
L
N
NC1 NO1 C1
NC2 NO2 C2 A Y B
531
1197
L
N
NC1 NO1 C1 NC2 NO2 C2
A Y B
531
1197
L
N
NC1 NO1 C1 NC2 NO2 C2 A Y B
531
1197
L
N
NC1 NO1 C1 NC2 NO2 C2 A Y B
531
1197
TM071470
Pos. Description
1 Ethernet RJ45 (BACnet IP, Modbus TCP)
2 Configurable I/O
3 Configurable I/O
4 RS485 transceiver (BACnet MS/TP, Modbus RTU)
5 Relay 1
6 Relay 2
7 Mains supply. Carry out the electrical connection and protection according to local regulations.
The terminals are coded in such a way that the relay terminal plugs cannot be used in the RS485 input and the configurable inputs
and outputs cannot be switched around.
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2.7 BACnet device Instance Number
The term "Device ID" is short for Device Identifier, and is shorthand for the Instance Number portion of the BACnet Device object
Object_Identifier property. The Device ID is a non-volatile value that is chosen and configured by someone at the site where the BACnet
product is installed. The Device ID is used for resolution of network layer addresses into application layer addresses, commonly referred to as
"binding".
Each BACnet device object at a site must have a unique instance number and name. The BACnet device object instance number and name
are assigned in the field as part of the installation configuration. When assigning instance numbers and names to device objects at a site, we
recommend maintaining a list of devices and their assigned BACnet device object unique instance numbers and names. A useful naming
convention can be made like this:
Building # (2 digits) – Floor # (2 digits) – Device Marker (1 digit) – Device Index (2 digits)
Keep in mind that the maximum instance number is 4,194,302.
The Device Object Identifier value consists of two components:
• a 10-bit Object Type (bits 22 to 31)
• a 22-bit Instance Number (bits 0 to 21)
31 22
10 bits 22 bits
21 0
Object type Instance Number
...
TM045977
The Object Type is fixed and determines that it is a Device Object. The Instance Number is a numeric code used to identify the device. It must
be unique inter-network-wide, that is on all interconnected networks.
The MIXIT unit offers two different approaches to setting the BACnet Device Object Instance Number: default and custom, both described in
the following subsections.
2.7.1 Default Device Object Instance Number
The Default Device Object Instance Number for the MIXIT unit is 227005. You can change the number via Grundfos GO Remote.
2.7.2 Custom Device Object Instance Number
The custom device instance number can be activated using Grundfos GO Remote and change it via AV,0.
ID Object name Access
AV,0 Config Custom Device Object Instance Number R/W
2.8 Best Practices
Make initial configuration of MIXIT with Grundfos GO before trying to connect from fieldbus
Before connecting and communicating with MIXIT, MIXIT shall be configured for the correct application and the communication protocol shall
be set up.
Ensure safe default values
Ensure to set the local setpoint AV,6 [°C] to a safe value, so heat/cooling is not lost if communication error. If in Combined (H/C), Setting of
fallback temperature must be made individually for Heating and Cooling mode respectively. AV,6 [°C] is always setting/displaying the default
setpoint. Use MO,4 to change between Heating and Cooling in case both defaults should be set.
Perform a continuous poll of a MIXIT BACnet register to maintain connectivity by reading :
Read from, for example, status register BI,1 (Status Control Source, 0: Local control 1: Bus control) every 30 sec to maintain communication
between Building Management System and MIXIT. If communication is lost, MIXIT will reverse back to local setpoint.
Only write to persistence data when needed
Ensure NOT to write in persistence area when making the iterative read of MIXIT to keep MIXIT in bus control. Instead read from the unit and
don’t write every 30 sec.
Ensure correct handling of power failures
If power failure occurs, MIXIT will start up in local when the power is re-established. To get MIXIT in remote, sent the complete set of initial
commands again.
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3. BACnet MS/TP Setup
3.1 BACnet bus topology
BACnet MS/TP is a multi-master system, meaning that there can be more than one master on the network. It uses a token to control access to
the bus network. A master node may initiate the transmission of a data telegram when it holds the token. Both master and slave nodes may
transmit data telegrams in response to requests from master nodes, but slaves never hold the token. Master nodes pass the token between
them. A BACnet MS/TP segment is a single contiguous medium to which BACnet nodes are attached. Segments can be connected by use of
repeaters or bridges, thus forming networks. Multiple networks may be interconnected by BACnet routers to form a BACnet inter-network.
MS
S
S
M
M
BR
LT
S
LT
TM044274
Pos. Description
M Master
S Slave
BR Bias resistor
LT Line termination
3.1.1 Line termination resistors
Line termination must be connected at each of the two ends of the segment medium. The MIXIT unit is fitted with built-in optional line
termination resistor.
Enable the termination resistor for line termination if the unit is set as the last station on the network. Set the DIP switch to "ON" to activate.
The termination resistor is fitted inside the MIXIT unit and has a value of 120 Ω.
TM075759
Related information
3.3 Configuring BACnet MS/TP
3.1.2 Bias resistors
The BACnet system integrator must specify if and where a bias resistor is needed. A bias resistor ensures that an undriven communications
line will be held in a guaranteed logical one state. The bias provides a reliable way for stations to detect the presence or absence of signals on
the line. An unbiased line will take an indeterminate state in the absence of any driving node. The MIXIT unit has no bias resistors.
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3.2 Cables for BACnet MS/TP
We recommend that the maximum cable length within a BACnet MS/TP segment is 1200 meters (4000 ft) with a 0.82 mm2 (AWG 18) cable.
Connection between the BACnet modules must be made by using a screened, twisted-pair cable with a characteristic impedance between 100
and 130 Ω.
Use a screened, twisted-pair cable and connect the 3 wires according to below table:
Terminal Recommended color Data signal
A Red Positive
B Green Negative
Y Grey Ground
The wiring must follow the ANSI/ASHRAE BACnet standard. The standard states that the cable screen must only be earthed at one end of the
segment to prevent earth fault currents.
3.3 Configuring BACnet MS/TP
The configuration of the BACnet interface is done with Grundfos GO Remote. Please follow the below steps
1. Turn on MIXIT and connect it to the pump. See separate installation and operating instructions for MIXIT.
• If it is the first time MIXIT is connected to Grundfos GO Remote, please run the initial setup wizard
2. Make sure the CONNECT upgrade is installed and select the communication protocol
• When the Dashboard is displayed on the screen, press Upgrades and control the green check mark in the CONNECT upgrade
• Upgrade MIXIT with the CONNECT upgrade, if unavailable
3. Select the communication protocol - if it is not selected in the initial setup use one of the following entries.
•Settings menu: other Settings > Connectivity settings > Fieldbus connection settings > BACnet MS/TP,
•Settings menu: Settings > Setpoint > Reconfigure setpoint input > Setpoint from fieldbus connection. Press Next, select
BACnet MS/TP and press Next again.
•Upgrades menu: Upgrades > CONNECT upgrade > Reconfigure > Fieldbus connectivity > BACnet MS/TP.
4. Set up protocol settings
a. Baud rate (transmission speed)
The transmission speed must be set correctly before the MIXIT unit is ready to communicate on the BACnet MS/TP network. Use
Grundfos GO Remote to set the transmission speed. All devices on the BACnet MS/TP network must communicate at the same
transmission speed.
b. Range (MAC address)
The MAC address must be within the range of 0 to 127 and must be unique on the BACnet MS/ TP segment. By default, the MAC
address on our controllers is set to 5. An illegal value will result in a MAC address of 0. Max. master must be within the range of 1 and
127.
c. Range (Max master)
Max. master must be within the range of 1 and 127.
To increase network efficiency, we recommend configuring the Max Master of the highest MAC device when there are less than 127
devices on the network. The Max Master prevents the Poll From Master (PFM) from exceeding the current value set. For example, 32
devices with MAC addresses ranging from 1 to 32 and a Max Master of 33 ensures that the PFM are not done for addresses higher than
33. If a new device is entered outside the set value of the MAX Master, the network will not see the device until the MAX Master has
been changed to include the new device
d. Device Object Instance Number
The MIXIT unit offers two different approaches to setting the BACnet Device Object Instance Number: default and custom. The default
BACnet Device Object Instance Number is 227005. The use of custom can be enabled in Grundfos GO Remote and customised via
AV,0
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4. BACnet IP Setup
4.1 Cables for BACnet IP
Use RJ45 plug and Ethernet cable. If available, connect the cable shield to protective earth at both ends.
The standard cable length is max. 100 meters.
4.2 DATA and Link LED's
Check the data and link LED’s to ensure communication is established:
Status Description
Green on Ethernet Link on the RJ45 connector is OK
Green off No Ethernet Link on the RJ45 connector
Yellow on Link OK, no traffic
Yellow flashing Data communication ongoing on the RJ45 connector
4.3 Configuring BACnet IP
The configuration of the BACnet interface is done with Grundfos GO Remote. Please follow the below steps:
1. Turn on MIXIT and connect it to the pump. See separate installation and operating instructions for MIXIT.
• If it is the first time MIXIT is connected to Grundfos GO Remote, please run the initial setup wizard
2. Make sure the CONNECT upgrade is installed and select the communication protocol
• When the Dashboard is displayed on the screen, press Upgrades and control the green check mark in the CONNECT upgrade
• Upgrade MIXIT with the CONNECT upgrade, if unavailable
3. Select the communication protocol - if it is not selected in the initial setup use one of the following entries.
•Settings menu: other Settings > Connectivity settings > Fieldbus connection settings > BACnet IP,
•Settings menu: Settings > Setpoint > Reconfigure setpoint input > Setpoint from fieldbus connection. Press Next, select
BACnet IP and press Next again.
•Upgrades menu: Upgrades > CONNECT upgrade > Reconfigure > Fieldbus connectivity > BACnet IP.
4. Setup IP settings
• IP addresses can either be static or assigned via DHCP. If you want to use DHCP, then DHCP should be enabled. If DHCP is selected,
wait for 1 minute before checking the IP address given to MIXIT.
• For static settings please follow the flow in the Grundfos GO Remote.
5. Setup other protocol settings
• UDP port number, Device Name, Device Location.
• Custom Device object instance number: The MIXIT unit offers two different approaches to setting the BACnet Device Object Instance
Number: default and custom. The use of custom can be enabled in Grundfos GO Remote and customised via AV,0
• Foreign Device setting – if the MIXIT unit should be configured as a foreign device: IP address, UDP port, reregister time
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5. Setting up MIXIT and communicating using BACnet
Having successfully completed the setup in the previous sections, it is now possible to start communicating with the MIXIT unit.
5.1 Hello world - starting communication with MIXIT
Perform the operations stated in the below table to establish the first initial communication with MIXIT.
ID Object Name Description Value
BO,0 Set Control Source 0: Local control (power-on default)
1: Bus control 1
MV,0 Config Temperature Setpoint Source [Enum]
1: default_setpoint
2: ana_temp_setpoint
3: temp_setpoint_remote
4: outdoor_temp
5: outdoor_temp_remote
3
AO,0 Set Temperature Setpoint Remote [°C*] Temperature setpoint set via fieldbus 45 = 45 °C
BO,1 Set Start Stop 0: Stop system (OFF) (default)
1: Start system (ON) 1
*Remember all temperature in BACnet is written in 1°C
5.1.1 Ensure safe default values
• Ensure to set the local setpoint AV,6 [°C] to a safe value, so heat/cooling not is lost if communication error. If in Combined (H/C), Setting of
fallback temperature must be made individually for Heating and Cooling mode respectively. AV,6 [°C] is always setting/displaying the
default setpoint. Use MO,4 to change between Heating and Cooling if both defaults should be set. Please refer Best Practices .
5.2 Maintaining communication with the MIXIT unit
Perform a continuous poll of a MIXIT BACnet register to maintain connectivity:
Read from, for example, status register BI,0 (Status Control Source, 0: Local control 1: Bus control) every 30 sec to maintain communication
between Building Management System and MIXIT. If communication is lost, MIXIT will reverse back to local setpoint.
Only write to persistence data when needed
Ensure NOT to write in persistence area when making the iterative read of MIXIT to keep MIXIT in bus control. Instead read from the unit and
don’t write every 30 sec.
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6. Object overview
6.1 BACnet device object
The following properties are supported in the device object.
Property identifier Data type Description Access
Object_identifier BACnetObjectIdentifier Device Object Instance Number R
Object_name Character string Device Object Name R/W
Object_Type BACnetObjectType Device R
System_Status BACnetDeviceStatus Operational R
Vendor_Name Character string Grundfos R
Vendor_Identifier Unsigned16 227 R
Model_Name_Family Character string
Grundfos product family. This will show
the Grundfos pump model to which the
MIXIT unit is connected to.
R
Model_Name_type GrundfosUnitType Grundfos product type number. R
Model_Name_version GrundfosUnitVersion Grundfos product version number. R
Firmware_Revision Character string Revision number of the BACnet
firmware in the MIXIT unit. R
Application_Software_Version Character string Software build date, DD-MM-YYYY. R
Location Character string The user can enter a location here
(maximum 200 characters). R/W
Description Character string The user can enter a description here
(maximum 200 characters). R/W
Protocol_Version Unsigned Actual revision of the BACnet protocol. R
Protocol_Revision Unsigned Actual revision of the BACnet protocol. R
Protocol_Services_Supported BACnetServicesSupported This indicates which standardised
protocol services are supported. R
Protocol_Object_Types_Supported ProtocolObjectTypesSupported This indicates which standardised
protocol object types are supported. R
Object_List BACnetARRAY[N]ofBACnetObjectIden
tifier An array of objects available. R
Max_APDU_length_Accepted Unsigned The maximum number of bytes that
may be contained in a single APDU. R
Segmentation_Supported BACnetSegmentation
This indicates if segmentation of
messages is possible. It will always
read NO_SEGMENTATION to indicate
that segmentation is not possible.
R
APDU_Timeout Unsigned This indicates the amount of time in ms
before timeout. R
Number_Of_APDU_Retries Unsigned This indicates the maximum number of
times an APDU is to be retransmitted. R
Max_Master Unsigned
This specifies the highest possible
address for master nodes and must be
between 1 and 127. The default value
is 127, but this value can be lowered
by the user to reduce transmission
overhead.
R/W
Max_Info_Frames Unsigned
This specifies the maximum number of
information frames that are sent before
the token is passed on.
R
Device_Address_Binding List of BACnetAdressBindings This holds address bindings to other
devices, if any. R
Database_Revision Unsigned Logical revision number for the device
database. R
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6.2 Binary inputs
ID Object name Access Description
BI,0 Set Control Source R
0: Local control (default)
1: Bus control
Is 1 if the bus control is activated. Activation of bus control is done via BO, 0.
BI,1 Status Fan and Dampers R
0: Disabled
1: Enabled
When the coil has been preheated the air temperature after the coil is controlled
according to the setpoint. MIXIT signals this at the fieldbus by setting BI,1=1. Only for
Heating Coil application.
BI,2 Status Actual Run State Pump R
0: Stopped
1: Started
This status shows the actual pump run status.
BI,3 Status Ready R
0: Not ready
1: Ready
Indicates if the system is ready for operation or not
BI,4 Status Fault R
0: No fault
1: Fault
If 1, the system is stopped due to an alarm
BI,5 Status Alarm Simulation R
0: Inactive
1: Active
Status of alarm/warning simulation.
BI,6 Notification Flow Temp High R
0: Not detected
1: Detected.
If detected:
• the mixing temperature is above the configured value,
• external overheat signal is set, or
• overheat protection is forced by setting BO,3 to 1.
The notification is not resettable.
The internal detection function is configured with Grundfos GO Remote.
The function is associated with the underfloor heating application.
BI,7 Notification Frost Risk Detected R
0: Not detected
1: Detected.
If 1, frost risk is detected. The notification is not resettable.
The internal detection function is configured with Grundfos GO Remote.
BI,8* Notification Supply Flow High R
0: Not above
1: Above.
If 1, the supply flow is above the limit in AV,10 for an extended time (3600 s). The
notification is not resettable, but it will reset itself.
The supply flow limit function is enabled and disabled with Grundfos GO Remote or
BV,0(Heating) or BV,4 (Cooling).
BI,9* Notification Thermal Power High R
0: Not above
1: Above.
If 1, the thermal power is above the limit in AV,11 for an extended time (3600s).
The notification is not resettable, but it will reset itself.
The supply flow limiter function is enabled and disabled with Grundfos GO Remote
or BV,1(Heating) or BV,5 (Cooling).
BI,10* Notification Return Temperature
Threshold R
0: Not above (heating), not below (cooling)
1: Above (heating), below (cooling).
If 1, the return temperature exceeds the limit in AV,12 for an extended time (3600 s). The
notification is not resettable, but it will reset itself.
The supply flow limit function is enabled and disabled with Grundfos GO Remote
or BV,2(Heating) or BV,6 (Cooling).
BI,11* Notification Differential
Temperature High R
0: Not above (heating), not below (cooling)
1: Above (heating), below (cooling).
If 1, the primary differential temperature exceeds the limit in AV,13 for an extended time
(3600 s). The notification is not resettable, but it will reset itself.
The supply flow limiter function is enabled and disabled with Grundfos GO Remote
or BV,3(Heating) or BV,7 (Cooling).
BI,13 Heat Curve Slope Factor Enabled R
0: False
1: True
Used to indicate whether base curve is linear or non-linear.
BI,14 Heat Curve Offset Range
Exceeded R
0: Exceeded
1: Not exceeded
Used to indicate that heat curve offset value is out of range [-15 ; 15].
BI,15 Heat Curve Slope Factor Range
Exceeded R
0: Exceeded
1: Not exceeded
Used to indicate that heat curve slope factor value is out of range [0.4 ; 2.0].
Note: Objects marked with * are only available for DYNAMIC variants
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6.3 Binary outputs
ID Object name Access Description
BO,0 Set Control Source W
0: Local control (default)
1: Bus control
Set to 1 to enable control via BACnet. See BI,0 for actual state.
BO,1 Set Start Stop W
0: Stop (Off).
1: Start (ON)
If set to 0:
• The pump stops
• The valve closes
The value of MI,2 will be 3 if there is no system fault.
BO,2 Reset fault W Resets pending alarms and warnings. The data point is rising edge triggered.
BO,3 Enable Overheat Protection W
0: Disable overheat indication (default)
1: Set overheat indication
When set, the valve is closed, and the pump is stopped when the limit is exceeded. Can
be used to simulate the overheat protection function during test.
This function is only active for underfloor heating application.
Actual status is read via BI,6.
BO,4 Enable Frost Protection, heating W
0: Disable frost protection (default)
1: Enable frost protection
When enabled, the valve opens fully when the limit is exceeded. The function is only
active for heating coil application.
Actual status is read via BI,7.
BO,5 Set Fault Simulation W Activate (rising edge) or deactivate (falling edge) the alarm/warning simulation.
BO,8 Enable Frost Protection Cooling
Mode W0: Disable frost protection (default)
1: Enable frost protection.
6.4 Binary values
ID Object name Access Description
BV,0* Config Supply Flow Limiting,
Heating R/W
0: Disabled (default)
1: Enabled.
Enabling of supply flow limit. When enabled, the consumed primary flow is limited below
the configuration in AV,10.
BV,1* Config Thermal Power Limiting,
Heating R/W
0: Disabled (default)
1: Enabled.
Enabling of thermal power limiter. When enabled, the delivered thermal power is limited
below the configuration in AV,11.
BV,2* Config Return Temp Limiting,
Heating R/W
0: Disabled (default)
1: Enabled.
Enabling of return temperature limiter. When enabled, the return temperature is limited
below (above for cooling applications) the configuration in AV,12.
BV,3* Config Primary DeltaT Limiting,
Heating R/W
0: Disabled (default)
1: Enabled.
Enabling of primary differential temperature limiter. When enabled, the differential
temperature on the primary side is limited below the configuration in AV,13.
BV,4* Config Supply Flow Limiting
Cooling R/W
0: disabled
1: Enabled.
Enabling of supply flow limit. When enabled, the consumed primary flow is limited below
the configuration in AV,17
BV,5* Config Thermal Power Limiting
Cooling R/W
0: disabled
1: Enabled.
Enabling of thermal power limiter. When enabled, the delivered thermal power is limited
below the configuration in AV,18.
BV,6* Config Return Temp Limiting
Cooling R/W
0: disabled
1: Enabled.
Enabling of return temperature limiter. When enabled, the return temperature is limited
below (above for cooling applications) the configuration in AV,10).
BV,7* Config Primary Delta T Limiting
Cooling R/W
0: disabled
1: Enabled.
Enabling of primary differential temperature limiter. When enabled, the differential
temperature on the primary side is limited below the configuration in AV,20.
Note: Objects marked with * are only available for DYNAMIC variants
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6.5 Multistate inputs
ID Object name Access Description
MI,0 Status Pump Control Mode,
Heating and Cooling R
1: Constant speed
2: Constant pressure
3: Proportional pressure
4: AUTOADAPT
5: Constant flow
Shows the current pump control mode.
MI,1 Data Application Type Heating R
1: Radiator heating
2: Underfloor heating
3: Heating coil
The registered application type via MO,2.
MI,2 Status System State R
1: Powering up (~30 s)
2: Fault (fault relay activated)
3: Ready
4: Preheating heating coil
5: Temperature control state (ready relay activated)
6: Frost protection
7: Underfloor overheat protection
8: Shut down due to removal of start signal
10: Valve 100 % open (for backup)
11: Return temperature control.
MI,3 Status Thermal selection R 1: Heating
2: Cooling
MI,4 Data Application type Cooling 1: General Cooling
The registered application type via MO,5
6.6 Multistate outputs
ID Object name Access Description
MO,0 Config Pump Control Mode,
Heating W
1: Constant speed
2: Constant pressure
3: Proportional pressure
4: AUTOADAPT
5: Constant flow
Sets the pump control mode for heating mode
MO,1 Set Manual Valve Function W
1: Off (default)
2: 100% open
3: 50% open
4: 25% open
5: 0% (closed)
Function for manual setting of the valve opening, e.g. for degassing use or other service
purposes.
MO,2 Set Application Type Heating W
1: Radiator heating
2: Underfloor heating
3: Heating coil
This sets the application type for Heating.
MO,3 Config Pump Control Mode
Cooling W
1: Constant speed
2: Constant pressure
3: Proportional pressure
4: AUTOADAPT
5: Constant flow
Sets the pump control mode for cooling mode
MO,4 Config Thermal selection W
1: Heating
2: Cooling
Used for change-over between Heating and Cooling in Combined Heating/Cooling
applications.Configuration of Thermal Application Mode must happen via Grundfos
GO Remote.
MO,5 Set Application Type Cooling W 1: General Cooling
This sets the application type for Cooling
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6.7 Multistate value
ID Object name Access Description
MV,0 Config Temp Setpoint Source R/W
This selects the source of the temperature setpoint.
1: default_setpoint
2: ana_temp_setpoint
3: temp_setpoint_remote
4: outdoor_temp
5: outdoor_temp_remote
• 1: Default
• 2: Relates to setpoint from analog input terminals.
• 3: Relates to AO,0.
• 4: Utilizing heat curve in MIXIT with input from outdoor temperature sensor
connected to MIXIT. Associated with the following objects:
- AV,4
- AV,5
- BI,13
- BI,14
- BI,15
• 5: Utilizing heat curve in MIXIT with outdoor temperature input from fieldbus AO,1.
Associated with objects:
- AV,4
- AV,5
- BI,13
- BI14
- BI,15
For all options, the actual temperature setpoint used by the algorithm can be read at
AI,2.
Configuration of analogue input must happen via Grundfos GO Remote.
6.8 Analog inputs
ID Object name Access Description
AI,0 Data Temp Setpoint Remote [°C] R Actual value of remote temperature setpoint.
AI,1 Data Outdoor Temp Remote [°C] R Actual value of remote outdoor temperature.
AI,2 Data Act Temp Setpoint [°C] R
Actual temperature setpoint used in temperature controller. If the limiter function is set to
off, it is the same as the actual reference temperature derived from the set reference
temperature mode via MV,0.
AI,5 Status Pump Warning
Code [Enum] R Actual pump warning code.
AI,6 Status Pump Alarm Code [Enum] R Actual pump alarm code.
AI,7* Data Heating Energy [kWh] R Accumulated heating energy in total lifetime.
AI,8* Data Heating Power [kW] R Current thermal power for product running in heating mode.
AI,9* Data Cooling Energy [kWh] R Accumulated cooling energy in total lifetime. Reset by BO,6.
AI,10* Data Cooling Power [kW] R Current thermal power for product running in cooling mode.
AI,11* Data Heat Temp Difference [°C] R Numerical value of forward and return pipe differential temp. Used for heat transfer
calculation.
AI,12 Data Pump Power [W] R Current electrical power consumption of pump.
AI,13 Data percentage Speed [%] R Percentage of maximum pump speed.
AI,14 Data Pump Operating Hours [h] R Counter for pump operating hours.
AI,15 Data Pump Energy [kWh] R Accumulated pump energy.
AI,16 Data Flow Temp [°C] R Flow temperature measured in the secondary side via the connected pump.
AI,17 Data Supply Temp [°C] R Supply temperature measured at the valve.
AI,19 Data Logical Valve Opening [%] R Valve opening request, linear from algorithm.
AI,20* Data Valve Supply Flow [m3/h] R Flow rate at primary side measured at the A-port.
AI,21 Data Return Temperature [°C] R Return temperature measured at the valve.
AI,22 Data Controlled Temp [°C] R Actual controlled temperature: zone air, flow temperature.
AI,23 Data Supply Source Setpoint [°C] R Supply source temperature reference derived from setpoint and thermal mode of the
mixing loop. Cooling: requested setpoint – 1.5°C, Heating: requested setpoint + 5°C.
AI,24 Data Pump Flow [m3/h] R Actual pump flow.
AI,25 Data Pump Head [m] R Actual pump head.
AI,26 Data Outdoor Temp [°C] R Outdoor temperature measured at analog input. The outdoor temperature sensor
configuration is done via Grundfos GO Remote.
AI,27 Data Zone Air Temp [°C] R Air temperature measured at analog input. The air temperature sensor configuration is
done via Grundfos GO Remote.
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ID Object name Access Description
AI,35 Status System Warning
Code [Enum] R
Warning codes for the MIXIT unit:
84: Memory storage media faulty
91: Secondary flow temperature sensor fault(pump)
97: Missing analog input
125: Outdoor sensor fault
126: Remote air temperature sensor fault
157: Real time clock battery fault
161: 5 V/12 V internal supply fault
162: 24 V internal supply fault
169: Flow sensor fault
175: Supply (forward) temp. sensor fault
176: Return temperature sensor fault
236: Multi-pump alarm for pump 1
237: Multi-pump alarm for pump .
AI,36 Status System Sub Warning
Code [Enum] R Sub codes for warnings – detailing the cause of the warning. See MIXIT I&O for details.
AI,37 Status System Alarm
Code [Enum] R
Alarm codes for the MIXIT code:
10: Pump communication fault
25: Wrong configuration
39: Valve fault
72: Internal hardware fault
91: Flow temperature sensor fault
132: Missing GSC file configuration
203: Pump alarm
230: MAC address not configured
236: Pump faulty
AI,38 Status System Sub Alarm
Code [Enum] RSub codes for alarms– detailing the cause of the alarm.
See MIXIT I&O for details.
AI,39* Data HeatingVolume [m3] R Totally pumped heating volume
AI,40* Data CoolingVolume [m3] R Totally pumped cooling volume
AI,41* Data VolWeightAvgT1Heat [°C
m3] R Totally volume weighted average for T1, Heating (Inlet)
AI,42* Data VolWeightAvgT2Heat [°C
m3] R Totally volume weighted average for T2, Heating (Outlet)
AI,43* Data VolWeightAvgT1Cool [°C
m3] R Totally volume weighted average for T1, Cooling (Inlet)
AI,44* Data VolWeightAvgT2Cool [°C
m3] R Totally volume weighted average for T2, Cooling (Outlet)
Objects marked with * are only available for DYNAMIC variants
6.9 Analog Output
ID Object name Access Description
AO,0 Set Temperature Setpoint Remote
[°C] W
Temperature setpoint via fieldbus.
Enabling:
• Set BO,0 (Set Control Source) to 1.
• Set MV,0 (Config Temp Setpoint Source) to 3
AO,1 Set Outdoor Temperature Remote
[°C] W
Temperature setpoint via fieldbus.
Enabling:
• Set BO,0 (Set Control Source) to 1.
• Set MV,0 (Config Temp Setpoint Source) to 5
6.10 Analog Valve
ID Object name Access Description
AV,0 Config Custom Device
Object Instance Number R/W
Value for Custom Device Object Instance Number. Used in conjunction with Grundfos
GO setup
Present_Value range: 0-0x3FFFFE.(4194302)
Default Present_Value: 0xE7.
AV,1 Config Product time and date R/W
Product time and date in UNIX format (seconds since 00:00 01-01-1970) for the MIXIT
unit
Range: 1577836800 to 4070908799 (1/1/2020 – 31/12/2098)
AV,2 Set Simulation Event
Code [Enum] R/W Set alarm/warning code to simulate.
AV,3 Set Simulation Event Sub
Code [Enum] R/W Set sub error code to simulate.
AV,4 Config Heat curve offset (+/-) [°C] R/W Adjusts the heat curve offset in degrees Celsius (+/- 15) [°C]. It is used when MV,0 = 4 or
MV,0 = 5.
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ID Object name Access Description
AV,5 Config Heat curve slope (+/-) [-] R/W Adjusts the slope of the configured heat curve (Min: 0.4, Max: 2).
1 equals the configured heat curve and 1.5 equals the configured slope multiplied by 1.5.
AV,6 Config Default Temp Setpoint [°C] R/W
Fall back temperature setpoint in case setpoint signal from bus or sensor is lost.
Default: 40 °C (Heating), 15 °C (Cooling).
Setting of fallback temperature must be made individually for Heating and Cooling mode
respectively.
AV, 7 Config Pump Head Duty Point,
Heating [m] R/W Desired pressure duty point for constant or proportional pressure control modes.
AV, 8 Config Pump Flow Duty Point,
Heating [m3/h] R/W Desired flow duty point for proportional pressure and flow control.
AV,9 Config Pump Speed DutyPoint,
Heating [ %] R/W Desired speed in control mode constant speed. Depending on pump model, the minimum speed may be larger than minimum accepted at data point (larger than 30%).
AV,10* Config Supply Flow Limit Heating
[m3/h] R/W Primary flow limit for hydronic balancing. The primary flow limit is enabled BV,0.
AV,11* Config Thermal Power Limit
Heating [kW] R/W Thermal power limit for the hydronic balancing. The thermal power limit is enabled by BV,1.
AV,12* Config Return Temp Limit Heating
[°C] R/W
Return temperature limit for hydronic balancing. The return temperature limit is enabled
by BV,2.
For heating applications, the value works as an upper threshold.
AV,13* Config Primary DeltaT Limit
Heating [°C] R/W
Differential temperature limit for hydronic balancing. The differential temperature limit is
enabled by BV,3.
The value is positive for both heating and cooling applications.
AV,14* Config Pump Head Duty Point
Cooling [m] R/W Desired pressure duty point for constant or proportional pressure.
AV,15* Config Pump Flow Duty
Point Cooling [m3/h] R/W Desired flow duty point for proportional pressure and flow control.
AV,16* Config Pump Speed Duty Point
Cooling [ %] R/W Desired speed in control mode constant speed.
AV,17* Config Supply Flow
Limit Cooling [m3/h] R/W Primary flow limit for hydronic balancing in cooling mode. The primary flow limit is
enabled by BV,4.
AV,18* Config Thermal Power Limit
Cooling [kW] R/W Thermal power limit for hydronic balancing in cooling mode. The thermal power limit is enabled by BV,5.
AV,19* Config Return Temp Limit Cooling
[°C] R/W Return temperature limit for hydronic balancing in cooling mode. The return temperature limit is enabled by BV,6. For cooling applications, the value works as a lower threshold.
AV,20* Config Primary Delta T Limit
Cooling [°C] R/W
Differential temperature limit for hydronic balancing in cooling mode. The differential
temperature limit is enabled by BV,7. The value is used as an absolute value (always
positive) for both heating and cooling applications.
Objects marked with * are only available for DYNAMIC variants
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