Belimo UK24MOD User manual
Product information
UK24MOD
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Belimo Gateway
MP to Modbus RTU - UK24MOD
Contents
Complete overview 2
Technical data 3
Safety notes 4
Product features 4
Installation and commissioning 4
Electrical installation 5
Dimensions 7
Operation elements 8
Operation, behaviour 8
Modbus register overview 11
Modbus register description 13
Diagnostics and testing tool 16
Connecting the PC-Tool for parameterisation of the MP/MFT(2) actuators 16
Version overview 17
MODBUS RTU
UK24MOD
Belimo Gateway MP to Modbus RTU
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T9-UK24MOD • en • v1.7 • 02.2014 • Subject to changes
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Complete overview
Gateway MP / Modbus RTU
Suitable MP/MPL/MFT(2) Actuators
Damper actuators
Fire damper actuators
VAV actuators
Actuators for characterised control valve, butterfly valves
and globe valves
EPIV actuators
MPL Actuators
UK24MOD
Belimo Gateway MP to Modbus RTU
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Gateway MP to Modbus RTU. MP-bus-
capable Belimo actuators can be
connected on the MP-Bus side.
Interface MP/Modbus RTU
Connection of MP/MPL/MFT(2)
actuators and BF-TopLine
actuators to Modbus RTU
Up to 8 actuators and sensors can
be connected
Technical data
Electrical data
Nominal voltage
AC 24V, 50/60 Hz / DC 24V
Power supply range
AC / DC 21.6…26.4 V
For wire sizing
3 VA
Connection
Modbus RTU
Supply
MP-Bus
Tool
Plug-screw terminal, 3-pin
Plug-screw terminal, 2-pin
Plug-screw terminal, 3-pin
(All terminals suitable for 2 x 1.5 mm2)
RJ12
Functional data
Supported actuators
MP/MPL/MFT(2), BF-TopLine
Quantity of actuators
max. 8 pcs.
Communication with actuators
Belimo MP-Bus, Master-Slave, 1200 Bd
Maximum signal conductor lengths MP
Dependent on the number of connected actuators,
actuator type, type of supply and signal conductor
cross-section
For details see page 5
Modbus protocol
Modbus RTU
Supported functions: 3, 6
(For register assignment, see page 11)
Modbus medium
Medium
Parity
Number of nodes
Baud rates
Response delay
Termination
Polarisation
RTU / RS-485
NONE (1, 8, N, 2) or EVEN (1, 8, E, 1),
adjustable via DIP switch
max. 32 (without repeater)
9'600, 19'200, 38'400, 76'800 Bd,
adjustable via DIP switch
2…100 ms, adjustable via register
150
, adjustable via DIP switch
680
, adjustable via DIP switch
Safety
Protection class
III Safety extra-low voltage
EMC
CE pursuant to 2004/108/EC
Ambient temperature
0…+40° C
Installation / Dimension / Weight
Mounting
Control cabinet installation,
can be snapped onto top hat rail 35 mm
Dimensions
see page 7
Weight
ca. 100 g
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Safety notes
The device is not allowed to be used outside the specified field of application.
It may be installed only by suitably trained personnel.
The device does not contain any parts that can be replaced or repaired by the user
and may only be opened at the manufacturer's site.
Product features
Mode of operation
The UK24MOD allows the actuators to be controlled digitally via the MP-Bus and send back
their current operating status. The control system information and the response is administered
in registers in the UK24MOD and can be processed with Modbus commands. This permits the
actuator functions to be integrated directly into the Modbus.
Sensor linking
One sensor can be connected per MP/MFT(2) actuator. This can be a passive resistance
sensor (PT1000, NI1000 or NTC), an active sensor (output DC 0…10 V), or a switching contact.
This provides a straightforward way of digitising the analogue signal of the sensors with the
Belimo actuator and transferring it via UK24MOD to the Modbus.
MPL actuators don't provide a sensor input.
Installation and commissioning
Installation and wiring
The device is mounted on 35 mm top hat rails. The wiring is accomplished with plug-screw
terminals.
Commissioning and parameterisation
Commissioning requires no configuration tools.
The Modbus parameterisation of the device is accomplished with DIP switches (address, baud
rate, parity, bus terminator, polarisation). The option exists of setting the response delay via
register entry (2..100 ms).
The addressing of the MP actuators is accomplished either with the keys under the front cover
or with the Belimo PC-Tool MFT-P.
The MP-Bus assignment is determined automatically and continuously updated. No backup of
the network structure takes place.
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Belimo Gateway MP to Modbus RTU
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Electrical installation
Wiring diagram
AC/DC 24 V supply
Connection via safety isolation
transformer!
Dimensioning of the supply
Also take into account the dimensioning
specifications of the connected
MP/MPL/MFT(2) actuators!
The wiring of Modbus RTU / RS485 is to be carried out in accordance with applicable directives
(www.modbus.org). The device possesses resistors which can be switched on for bus
connection and biasing.
Note: The GND of the RS485 line is galvanically isolated from the MP-Bus GND.
Connection of the MP-Bus
The network consists of a 3-pin connection
(MP communication and 24 V supply).
Possibility of connecting a maximum of 8 MP/MPL/MFT(2) actuators per network.
Neither a special cable nor terminating resistors are required.
The signal conductor lengths (for calculation, see below) are limited:
–by the sum of the signal conductor data of the connected MP/MPL/MFT(2) actuators,
–by the type of supply (AC 24 V via the bus or DC 24 V via the bus),
–by the signal conductor cross-section.
With AC 24 V supply:
Maximum signal conductor length
L = max. cable length [m]
With AC 24 V supply:
Total dimensioning
MP/MPL/MFT(2) actuators [VA]
Power rating [VA]
UK24MOD
More actuators
and sensors
(total 8)
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Electrical installation
(continued)
With AC 24 V supply:
Calculation of the maximum signal
conductor lengths
To be read out from the mass of curves:
For cables with wire-Ø
[mm²]
Cable length
[m]
0.75
29
1.00
35
1.50
50
2.50
90
The power ratings [VA] of the MP/MPL/MFT(2) actuators used are to be added, and the
corresponding signal conductor lengths are to be read from the diagram.
Example:
The following is connected to the MP-Bus: 1 pc. NM24A-MP, 1 pc. SM24A-MP, 1 pc. LMV-D2-
MP… and 1 pc. NV24A-MP
Total power rating: 5.5 VA + 6 VA + 5 VA + 5 VA = 21.5 VA
With local supply AC 24 V (on site):
Maximum signal conductor length
Wire-Ø
[mm²]
L = max. cable length
[m]
0.75
800
1.00
1.50
2.50
The signal conductor lengths can be significantly increased if the actuators are supplied with AC
24 V locally via a separate transformer. The signal conductor lengths indicated in the table apply
regardless of the performance data of the actuators connected to the UK24MOD.
With DC 24 V supply:
Maximum signal conductor length
L = max. cable length [m]
With DC 24 V supply:
Total power consumption
MP/MPL/MFT(2) actuators [W]
Note
Cable length vs wire sizing power
applies to DC supply (minimum supply
voltage DC 24 V)
Cable length vs wire sizing power applies to DC supply (minimum supply voltage DC 24.0 V)
UK24MOD
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Belimo Gateway MP to Modbus RTU
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Electrical installation
(continued)
With DC 24 V supply:
Calculation of the maximum signal
conductor lengths
To be read out from the mass of curves:
For cables with wire-Ø
[mm²]
Cable length
[m]
0.75
55
1.00
75
1.50
110
2.50
190
The power consumption [W] of the MP/MPL/MFT(2) actuators used is to be added, and the
corresponding signal conductor lengths are to be read from the diagram.
Example:
The following is connected to the MP-Bus: 1 pc. NM24A-MP, 1 pc. SM24A-MP, 1 pc. LMV-D2-
MP.. and 1 pc. NV24A-MP
Total power rating 3.5 W + 4 W + 3 W + 3 W = 13.5 W
Dimensions
Dimensional drawings [mm]
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Operation elements
Legend
The illustration shows the operation elements of the device with the front cover open.
Operation, behaviour
Setting the Modbus address
The Modbus address is set in binary form with the 8 DIP switches under the front cover. The
valid address range is 1-247. Values outside of this range will be interpreted as either 1 or 247,
respectively.
+
~
+
~
-
┴
MP
-
┴
Display of the active
MP nodes
Addressing of the
MP nodes
Power LED
MP-Bus LED
Modbus LED
Setting
Baud rate
Setting
Modbus address
Setting
Terminator,
Polarisation,
Parity
D- D+
┴
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Operation, behaviour
(continued)
Setting the Modbus baud rate
The Modbus baud rate is set using the DIP switches under the front cover to the values 9'600,
19'200, 38'400 and 76'800.
The response delay of the device is set to a fixed 4 ms with 9600 Bd. A delay of 2 ms is used as
a default with higher baud rates. A longer delay can be set if needed via register 163.
The RS485 line must be completed at both bus ends with one resistor each. A suitable 150
element is present in the Gateway which can be switched with DIP switch 1 on the base plate.
The RS485 line can be polarised with two resistors (DIP switches 2 and 3) in order to reduce
interference effects during communications pauses. The biasing is implemented as a rule at one
of the bus ends. Switches 2 and 3 must always be respectively activated or deactivated
together.
The character transmission uses either the settings NO parity (1 start bit, 8 data bits, no parity,
2 stop bits) or EVEN parity (1 start bit, 8 data bits, even parity, 1 stop bit), The setting is done
with DIP switch 4.
Important:
The generally valid guidelines for RS485 / Modbus RTU are to be observed!
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Operation, behaviour
(continued)
Automatic scanning of the MP network
The MP-Bus assignment is determined automatically and continuously updated. No backup of
the network structure takes place. The actuator information (e.g. series number, actuator type)
is extracted as soon as one supported actuator is detected at the addresses MP1…MP8.
In the event of a communications interruption, the Gateway will discard the affected actuator
after 10 seconds and reset the actuator register. Monitoring of the actuator is accomplished
preferably with the Actuator type register (12).
Addressing MP actuators
The Gateway supports the assigning of addresses to the MP nodes by means of the keys UP,
OK and DOWN, located behind the front cover.
Procedure:
1. Press down the OK key and keep it down until LED1 and MODBUS are continuously
illuminated.
2. Select an address (LED1…LED8) with the keys UP and DOWN
3. Start addressing sequence with OK key
4. Acknowledge addressing of the respective actuator within 4 minutes;
(depending on the type, using the address key, direction of rotation switch, ...)
5. Successful acknowledgement is made visible by the rapid flashing of the corresponding
LEDx. Afterwards, the Gateway will switch to standard operation.
The addressing process can be interrupted at any time by pressing the OK key.
The de-addressing of a node is not supported.
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Modbus register overview
Note
Some Modbus master number the
registers starting with 0 (not 1).
In these cases the registers are shifted
by 1 (e. g. MP1
0-19).
The information of the connected actuators is digitised per node in 20 registers each (à 16 bit).
The resulting register ranges for the MP nodes 1-8 are:
MP Address
Offset MP[n]
Range
MP1
0
Registers 1 - 20
MP2
20
Registers 21 - 40
MP3
40
Registers 41 - 60
MP4
60
Registers 61 - 80
MP5
80
Registers 81 - 100
MP6
100
Registers 101 - 120
MP7
120
Registers 121 - 140
MP8
140
Registers 141 - 160
Actuator register
Register
Air
Water
VAV
EPIV
Fire
MPL
Number
High Byte
Low Byte
MP[n] + 1
Setpoint [%]
MP[n] + 2
Override control
MP[n] + 3
Command
MP[n] + 4
Actual position [%]
MP[n] + 5
Relative volumetric flow [%]
MP[n] + 6
Errors
Malfunctions
()
MP[n] + 7
Sensor type
MP[n] + 8
Current sensor value
MP[n] + 9
Series number 1st part
MP[n] + 10
Series number 2nd part
MP[n] + 11
Series number 4th part
MP[n] + 12
Actuator type
MP[n] + 13
Time monitoring [s]
MP[n] + 14
Min [%]
MP[n] + 15
Max [%]
MP[n] + 16
Absolute volumetric flow
MP[n] + 17
Nominal volumetric flow
MP[n] + 18
-
MP[n] + 19
-
MP[n] + 20
-
Modbus functions
The Modbus functions Read Holding Registers [3] and Preset Single Register [6] are available
for writing/reading access on the registers.
Registers with boldface script have writing access. Because of the fact that the registers are not
continuously backed up, they should be updated periodically. The Gateway sends the values to
the actuators at regular intervals.
The MP-Bus assignment is determined automatically and updated. The Actuator type register
(12) should be evaluated for the monitoring of a node.
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Modbus register overview
(continued)
Service register
Note
Devices with V1.06 and older use
registers register 161 –164 for service
information.
Register
Number
High Byte
Low Byte
1001
Modbus baud rate
1002
Modbus address
1003
Response delay [ms]
1004
Firmware Version
The response delay (Register 1003) is backed up continuously.
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Modbus register description
Register 1:
Setpoint
Setpoint for actuator setting in hundredths of one percent,
i.e. 0…10,000 corresponds to 0…100%
In the case of actuators for fire dampers, the control must be accomplished through the
Override control register (2). Writing access to the setpoint is refused (see Register 6).
Register 2:
Override control
Overriding the setpoint with defined values
Override control
0
None
1
Open
2
Closed
3
Min
4
Mid
5
Max
6
Fast_closed
Due to safety considerations, the only override values permitted in the case of actuators for fire
dampers are Open (1) and Fast_closed (6). The operating position (Open) must also be
repeated within 120 seconds (recommendation: 90 sec.).
If the override command is not renewed, then the Gateway will move the actuator into safety
position and signal an error (see Register 6). The remaining time for the renewal is visible in
Register 13.
Register 3:
Command
Initiation of actuator functions for Service and Test; the selected command is transmitted to the
actuator, after which the register will be reset once more.
Command
0
None
1
Adaption
2
Test run
3
Synchronisation
4
Reset actuator malfunctions
MPL actuators (Actuator Type: 6) support only the command Adaption.
Register 4:
Actual position
Actual position in hundredths of one percent,
i.e. 0…10,000 corresponds to 0…100%
Register 5:
Relative volumetric flow
Relative volumetric flow in hundredths of one percent of Vnom,
i.e. 0…10,000 corresponds to 0…100%
This value is available only for VAV controllers and EPIV units (Actuator Type: 5).
For all other types, 65535 will be entered.
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Modbus register description
(continued)
Register 6:
Errors / Malfunctions
The status information is subdivided into actuator messages (malfunctions/maintenance) and
into errors detected by the Gateway. MPL actuators (Actuator Type: 6) don’t generate
Malfunctions/Maintenance information.
Bit
Description
Malfunctions
Maintenance
(Low Byte)
0
Excessive utilisation
1
Mechanical travel increased
2
Mechanical overload
3
-
4
Safety-relevant faults (fire & smoke only)
5
Damper test error (fire & smoke only)
6
Duct temperature too high (fire & smoke only)
7
Smoke detector tripped (fire & smoke only)
Faults
(High Byte)
8
No response from MP node
9
Checksum error MP node
10
Error message MP node
11
Value outside of range
12
Function not available for actuator type
13
Time exceeded (fire & smoke only)
14
-
15
-
The malfunction bits can be reset with Register 3 (command: 4) or with the Belimo PC-Tool.
Malfunctions 0 and 4 cannot be reset.
The error bits will be reset automatically by the Gateway.
Register 7:
Sensor type
Note
Switching of the sensor type may
necessitate a restart of the actuator in order
to read out correct sensor values.
Sensor type connected to the actuator; in the absence of sensor specification, the wiring at the
Y input of the MP actuator will have the effect of a local override.
Sensor type
0
None
1
Active sensor (mV)
2
Passive sensor 1k ()
3
Passive sensor 1…20k ()
4
Switching contact (0/1)
Note: The setting is not continuously backed up and should for that reason be updated
periodically.
Register 8:
Actual sensor value
Actual sensor value; dependent on the setting in Register 7
Register 9, 10, 11:
Series number
Each MP node has an unambiguous series number which is either impressed on or glued to the
node. The series number consists of 4 segments, although only parts 1, 2 and 4 are displayed
in the Gateway.
Example: 00839-31324-064-008
Register 9
Register 10
Register 11
1st part
2nd part
4th part
00839
31234
008
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Modbus register description
(continued)
Register 12:
Actuator type
Actuator type; the allocation may deviate from the basic category with some actuators.
Actuator type
0
Actuator not connected / not known
1
Air/water actuators with/without safety function
2
Valve actuator, linear
3
Valve actuator, rotary
4
Fire damper actuator
5
VAV controller / EPIV
6
MPL actuator
Note: In the event of a communications interruption, the Gateway will discard the affected
actuator after 10 seconds and reset the actuator type to 0. Monitoring of the actuator is thus
accomplished preferably with this register.
Register 13:
Time monitoring
Remaining time in seconds for the renewal of the override control (fire & smoke only). The
counter will be set to 120 seconds with each writing access at Register 2.
Register 14:
Min / Vmin setting
Minimum limit (position or flow) in hundredths of one percent,
i.e. 0…10,000 corresponds to 0…100%
Attention: Changing the limit may result in malfunction of the device.
Register 15:
Max / Vmax setting
Maximum limit (position or flow) in hundredths of one percent,
i.e. 2000…10,000 corresponds to 20…100%
Attention: Changing the limit may result in malfunction of the device.
Register 16:
Absolute volumetric flow
Absolute volumetric flow (or pressure)
This value is available only for VAV controllers and EPIV units (Actuator Type: 5).
For all other types, 65535 will be entered.
The unit depends on the node type:
[m
3
/h] for VAV controllers
[Pa] for VAV controllers in STP mode
[l/min] for EPIV units
Register 17:
Nominal volumetric flow
Nominal volumetric flow (or pressure)
This value is available only for VAV controllers and EPIV units (Actuator Type: 5).
For all other types, 65535 will be entered.
The unit depends on the node type:
[m
3
/h] for VAV controllers
[Pa] for VAV controllers in STP mode
[l/min] for EPIV units
Service register 1001 (former 161):
Modbus baud rate
Modbus baud rate (=x*100) in accordance with the setting of the DIP switches,
i.e. 96
9600 Baud
Service register 1002 (former 162):
Modbus address
Modbus address (1..247) in accordance with the setting of the DIP switches
Service register 1003 (former 163):
Response delay
Response delay (2…100 ms); the default value is 2 ms; the response delay is set to a fixed 4
ms with a baud rate of 9600.
The response delay must be increased in the event that the Modbus Master is unable to switch
quickly enough from transmission to reception mode.
Service register 1004 (former 164):
Firmware Version
Firmware Version of the device
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Diagnostics and testing tool
A PC-based tool is available for diagnostics and tests which can be utilised as a Modbus Master
and which uses graphics elements to depict the actuator information.
The UK24MOD Tool can be obtained through the Internet:
www.belimo.eu | Products … | Download Center
Connecting the PC-Tool for parameterisation of the MP/MFT(2) actuators
The MP network can be scanned, actuators can be addressed and actuator-specific parameters
(e.g. running time) can be readily adjusted with the Belimo PC-Tool.
The PC -Tool can be accessed directly on the MP-Bus via the RJ12 socket of the UK24MOD.
The Gateway recognises the connected PC-Tool automatically and stops communications with
the MP drives.
MP-Bus
Belimo
PC-Tool
ZK6-GEN
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Version overview
Firmware V1.08
New functions/modifications:
Bug fix: Modbus telegrams longer than 20 Bytes (e.g. ReadHoldingRegister with more
than 8 registers) are properly handled
Bug fix: Detection of new MP actuator in operation
Firmware V1.07
New functions:
New register for reading of nominal volumetric flow
Support for MPL actuators
Note on compatibility:
Service information can be found in registers 1001 to 1004 (former 161 to 164)
Known issues:
Modbus telegrams longer than 20 Bytes (e.g. ReadHoldingRegister with more than 8
registers) cause wrong register entries.
Firmware V1.06
New functions:
Timeout period for fire & smoke increased from 60 to 120 seconds (Register 2).
Higher numbers of nodes realizable per Modbus master.
Firmware V1.05
New functions:
New registers for adjusting Min (14) and Max (15) setting.
New register for reading of absolute volumetric flow.
Firmware V1.04
New functions:
Parity/Character transmission adjustable via DIP switch:
NONE (1, 8, N, 2) or EVEN (1, 8, E, 1)
Firmware V1.03
Release without restrictions
Table of contents
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