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Metering Gateway Modbus REG-K
MTN6503-0201
Application Metering Gateway 7602/1.0
Metering Gateway Modbus REG-KMTN6503-0201© Merten 200902/13 Function overview
Application Metering Gateway 7602/1.0 The KNX Metering Gateway is a device which connects
Many parameters and their settings are depend- meters via the Modbus open standard to KNX. The
|ent on the settings you have already made for oth- Modbus open standard allows you to receive a more in-
er parameters. This means that some parameters depth analysis of consumption in all areas of your build-
will appear or disappear and the values available ing.
for selection will change according to settings you You can connect up to 10 of the following types of me-
have already made. These dependencies have ters based on Modbus remote terminal unit (RTU):
not been shown in the table for reasons of clarity. Schneider Electric energy meters
All settings are always shown. Schneider Electric power meters
|Configurable times are set via the base and factor Schneider Electric Smart Interface Modules (SIM10M
parameters. The actual time is given by the multi- module)
plication of the two values. Example: Non-Schneider Electric Modbus RTU devices (offer-
Base = 1second, Factor = 3 ing you greater flexibility)
Actual time = 3 seconds
|The bold values in a table are the values set dur- With the information which the KNX Metering Gateway
ing factory configuration. provides you can visualise energy or media consump-
tion. This can also be used to reduce consumption
Table of contents through the use of control strategies within the KNX net-
work.
Function overview 1 You can choose from 17 different pre-prepared tem-
Behaviour of the application 1 plates for the meters and devices in order to quickly
Modbus settings 2 connect to a KNX network. Each template contains the
Metering device templates 3 20 most frequently needed Modbus values for simple
–Metering device x 3 configuration.
–Voltage and current monitor 4 From each connected Modbus RTU device the KNX
–Power monitor 4 Metering Gateway can read up to an additional 40 Mod-
–Consumption monitor 5 bus register values and transfer this data to the KNX
–Template for SIM10M module 6 network.
Direct access to Modbus register 7 You can read up to 10 meters using one KNX Metering
–Access to register X 7 gateway. This makes the Gateway very cost-efficient.
–Modbus register X 7 Integrating a SIM10 module makes it possible to deter-
Diagnostic block 8 mine and visualise gas and water consumption.
Overview of parameters 9 The KNX Metering Gateway is also suitable for retrofit-
Overview of communication objects 11 ting or for retroactive connection of existing Modbus
systems to KNX because it is fully compatible with me-
ters from other manufacturers.
Behaviour of the application
The application is influenced by the following events:
ETS download
Bus voltage failure
Bus voltage recovery
The behaviour differs according to function and can in-
fluence the measuring and monitoring function. There-
fore, you can set the behaviour using parameters at the
corresponding point. Refer to the chapter in question
for a precise description.
© 2013 Schneider Electric 1
Metering Gateway Modbus REG-K
MTN6503-0201
Modbus settings
Modbus settings Parameters
The gateway always works in master mode and the Modbus settings
connected Modbus devices work in slave mode. Com- Parameters Setting
munication from KNX bus to the Modbus is not possi- Baudrate setting (bit/sec) 1,200
ble. 2,400
4,800
Baudrate setting 9,600
The Baudrate is set depending on the distance be- 19,200
tween Modbus RTU devices. For instance with a Baud Parity None
rate of 9,600 bit/sec the maximum communication dis- Even
tance between 1 - 15 Modbus RTU devices is 1,200 Odd
metres. With the Baud rate of 19,200 bit/sec the maxi- Stop bit One stop bit
mum communication distance is 900 metres, as the ta- Two stop bits
ble shows below: Delay between frames
Baudrate setting Maximum communication Some devices require considerable time after end of re-
distance for 1 to 15 Modbus sponse until they are ready to receive the following re-
RTU devices quest from the master. In particular Schneider Electric
(Typical with Belden 3105A
cables) SEPAM power devices and legacy slave devices. As
9,600 bit/sec 1,200 m they are slow in dealing with the original request they
19,200 bit/sec 900 m may miss the following request.
Parity refers to the technique of checking if transmis- The time between requests should be less than 3.5
sion has been successful when transmitting between characters according to the Modbus specification.
devices. It lets you know if some data has been lost dur- However, these legacy devices need more time. The
ing transmission. parameter „Delay between frames“ solves this problem.
Setting of parity The time is automatically adapted to 3.5 characters of
the transmission speed, but you have the choice to in-
The Modbus supports only 11 bit frames. The ETS ap- crease this time if you need to support such slow legacy
plication sets stop bits automatically depending on the devices.
parity setting. "Parity" refers to the number of 1s in a giv- Parameters
en binary number. Odd parity means there are an odd Modbus settings
number of 1s and even parity means that there are an Parameters Setting
even number of 1s. Parity bits are used as a means of Delay between frames Disabled
error detection as digital data is transmitted and re- 1 ms* factor (50 .. 100) 50 - 100 adjustable in steps of 10
ceived. Both the Gateway and Meter must always be set
to the same as one another, odd, even or none. The de- Start-up delay
fault parity mode of Modbus is "even" parity. The parameter „Start-up delay“ specifies from what
point measured values are counted in the application.
|Make sure that all connected meters are always After an ETS download or bus voltage recovery, the de-
set to the same parity as one another, odd, even or vice starts measuring the connected channels when
one. the start-up delay is complete.
Parity = None: choose between one and two stop bits Parameters
Parity = Even: one stop bit is set Modbus Settings
Parity = Odd: one stop bit is set Parameters Setting
When parity is set to „None“ it is necessary to pre- Start-up delay 5
|set meters PM2x0, PM7x0 and PM8x0 to one stop 1 s * factor (1-250) adjustable in single steps
bit (all other meters require a setting of two stop
bits here). This means that under „None“ parity
PM2x0, Pm7x0 and PM8x0 meters cannot be
combined with other meters. In their case it is nec-
essary to work with „Odd“ or „Even“ parity.
2 © 2013 Schneider Electric
Metering Gateway Modbus REG-K
MTN6503-0201
Metering device templates
Metering device templates Metering device x
Pre-installed ETS templates provide you with the 20 You can select the metering device you require from the
most frequently needed values which makes configura- parameter „Type of metering device“. These are the 17
tion much easier and quicker. This also means there is devices from the previous table.
no need to map the Modbus register addresses to KNX. Each connected device has a unique address, between
The ETS application has special templates which you 1 and 247, as per the Modbus addressing protocol. To
use to implement the Schneider Electric Modbus RTU identify the device, you need to set its address at the
based energy or power meters and SIM10M module. parameter „Address of metering device“.
These devices are outlined in the table below: The template allows you to to monitor different kinds of
Supported devic- values. To achieve this it has three monitoring functions
es which you can enable by parameter. These are:
Type Name Description „Voltage and current monitor“
Energy/power meter PM9C power meter for the installation
distributor (cabinet) for measure- „Power monitor“
ment with current transformers „Consumption monitor“
Energy/power meter PM210 current, voltage, power and ener-
gy (each active/idle/apparent),
frequency and power factor With the parameter „Sending behaviour“ you can spec-
Energy/power meter PM710 slave pointer (min/max), Total ify how all values of the monitors are sent. For a cyclical
Harmonic Distortion (THD) I/THD sending, you can set the parameter „Time base“ to ei-
U harmonic distortion ther 1 second or 1 minute. The chosen setting applies
Energy/power meter PM750 like PM710 with alarm contact to all values of the whole template.
Energy/power meter PM810 like PM750 with 4-quadrant
measurement Parameters
Energy/power meter PM820 like PM810 with additional inte-
grated memory for logging events Metering device x
and analysis of harmonics. Parameters Setting
Energy/power meter PM850 like PM810 with harmonic content Type of metering device Disabled
Energy/power meter PM870 like PM850 with additional detec-
tion and logging of peaks of volt- PM9C
age and current PM210
Energy/power meter PM1200 like PM210 withTHD I/THD U har- PM710/PM750
monic distortion PM8x0
Energy/power meter DM6200 Ampere, volt, frequency meter DM1200
Energy/power meter iEM3150 direct measurement to 63A, DM6200
records energy
Energy/power meter iEM3155 like iEM3150 with alarm contact,
MID compliant iEM3150
Energy/power meter iEM3250 transformer measurement iEM3155
Energy/power meter iEM3255 like IEM3250 with alarm contact, iEM3250
MID compliant iEM3255
Energy/power meter PM3250 4-quadrant measurement, THD I/ PM3250/PM3255
THD U harmonic distortion
Energy/power meter PM3255 like PM3250 with alarm SIM10M
Smart Interface SIM10M input module for pulse counting. Address of metering device 1 ..247
Module Read Modbus values after start Enabled
Disabled
Voltage and current monitor Enabled
Disabled
Power monitor Enabled
Disabled
Consumption monitor Enabled
Disabled
Sending behaviour Cyclically (as configured
time)
If value was changed
Time base 1 sec
1 min
© 2013 Schneider Electric 3
Metering Gateway Modbus REG-K
MTN6503-0201
Metering device templates
Voltage and current monitor Power monitor
You can set the parameter „Voltage and current moni- The power monitor allows you to enable parameters as
tor“ to read Modbus values after start. Values for voltage follows:
and current are available for each phase (1-3) seperate- Power factor (power factor in cosΦ)
ly. When you enable the voltage or current of phase x Active power x, for each phase 1-3
you can then set their cyclic sending with integers of 1 Reactive power x, for each phase 1-3
second or 1 minute, with a base as configured in previ- Total active power (total power in kW), sum of phases
ous parameter „Time base“. 1-3
Parameters Total reactive power (total power in kVAr), sum of
Voltage and current monitor phases 1-3
Parameters Setting Total apparent power (total power in kVA), sum of
Voltage unit Millivolt (DPT 9.020) phases 1-3
Volt (DPT 9.*) With each of these you can then set their cyclic sending
Voltage of phase x Enabled with integers of 1 second or 1 minute, with a base as
Disabled configured in previous parameter „Time base“.
Cyclic voltage sending 2, 1 .. 250
Time base * factor (1-250) Parameters
Current unit Milliampere (DPT 9.021) Power monitor
Ampere (DPT 9.*) Parameters Setting
Current of phase x Enabled Power factor (cos phi) Enabled
Disabled Disabled
Cyclic current sending 2, 1 .. 250 Cyclic power factor sending 2, 1 .. 250
Time base * factor (1-250) Time base * factor (1-250)
Frequency Enabled Active power x Enabled
Disabled Disabled
Cyclic frequency sending 2, 1 .. 250 Cyclic active power factor sending 2, 1 .. 250
Time base * factor (1-250) Time base * factor (1-250)
Power datapoint Power kW (DPT 9.024), 2 Byte
Value power W (DTP 14.056), 4
Byte
Reactive power x Enabled
Disabled
Cyclic reactive power factor send- 2, 1 .. 250
ing
Time base * factor (1-250)
Power datapoint Power kW (DTP 9.024), 2 Byte
Value power W (DTP 14.056), 4
Byte
Total active power Enabled
Total reactive power Disabled
Total apparent power
Cyclic total active / reactive / apar- 2, 1 .. 250
ent power factor sending
Time base * factor (1-250)
Power datapoint Power kW (DTP 9.024), 2 Byte
Value power W (DTP 14.056), 4
Byte
4 © 2013 Schneider Electric
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