Weidmüller EM220-RTU
Three-phase energy meter that measures power, energy, demand and harmonics, with digital inputs and outputs.
The Weidmüller EM220-RTU is a three-phase energy meter that measures voltage, current, power and energy in distribution boards and machine cabinets. This Modbus RTU template reads all measurements, demand, harmonics and input states and lets you set CT ratios, demand, outputs and alarm thresholds from ModbusCloud.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 674, read and write
- Brand
- Weidmüller
- Key readings
- Voltage per phase · Current per phase · Active power · Power factor · Frequency · Import and export energy · Demand · Harmonic distortion
- Available commands
- CT and PT ratio · Demand period · Digital outputs · Alarm thresholds · Communication settings
- Compatible models
- EM220-RTU-4DI2DO (7760051005) · EM220-RTU-4DI2DO-GW (7760051006)
- Last updated
Registers (674)
673 read, 70 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Phase 1 Line to Neutral Voltage | V | Read | 0 | FC04 | float32 |
| Phase 2 Line to Neutral Voltage | V | Read | 2 | FC04 | float32 |
| Phase 3 Line to Neutral Voltage | V | Read | 4 | FC04 | float32 |
| Phase 1 Current | A | Read | 6 | FC04 | float32 |
| Phase 2 Current | A | Read | 8 | FC04 | float32 |
| Phase 3 Current | A | Read | |||
| Phase 1 Active Power | W | Read | |||
| Phase 2 Active Power | W | Read | |||
| Phase 3 Active Power | W | Read | |||
| Phase 1 Apparent Power | VA | Read | |||
| Phase 2 Apparent Power | VA | Read | |||
| Phase 3 Apparent Power | VA | Read | |||
| Phase 1 Reactive Power | var | Read | |||
| Phase 2 Reactive Power | var | Read | |||
| Phase 3 Reactive Power | var | Read | |||
| Phase 1 Power Factor | Read | ||||
| Phase 2 Power Factor | Read | ||||
| Phase 3 Power Factor | Read | ||||
| Phase 1 Phase Angle | ° | Read | |||
| Phase 2 Phase Angle | ° | Read | |||
| Phase 3 Phase Angle | ° | Read | |||
| Average Line to Neutral Voltage | V | Read | |||
| Average Line Current | A | Read | |||
| Sum of Line Currents | A | Read | |||
| Total System Active Power | W | Read | |||
| Total System Apparent Power | VA | Read | |||
| Total System Reactive Power | var | Read | |||
| Total System Power Factor | Read | ||||
| Total System Phase Angle | ° | Read | |||
| Frequency of Supply Voltages | Hz | Read | |||
| Import Active Energy | kWh | Read | |||
| Export Active Energy | kWh | Read | |||
| Import Reactive Energy | kvarh | Read | |||
| Export Reactive Energy | kvarh | Read | |||
| Apparent Energy | kVAh | Read | |||
| Ampere Hours | Read | ||||
| Total System Active Power Demand | W | Read | |||
| Maximum Total System Active Power Demand | W | Read | |||
| Import Active Power Demand | W | Read | |||
| Import Active Power Maximum Demand | W | Read | |||
| Export Active Power Demand | W | Read | |||
| Export Active Power Maximum Demand | W | Read | |||
| Total System VA Demand | VA | Read | |||
| Maximum Total System VA Demand | VA | Read | |||
| Neutral Current Demand | A | Read | |||
| Maximum Neutral Current Demand | A | Read | |||
| Total System Reactive Power Demand | var | Read | |||
| Maximum Total System Reactive Power Demand | var | Read | |||
| Voltage Phase Sequence | Read | ||||
| Current Phase Sequence | Read | ||||
| Nature of the Load | Read | ||||
| Nature of L1 Load | Read | ||||
| Nature of L2 Load | Read | ||||
| Nature of L3 Load | Read | ||||
| Line 1 to Line 2 Voltage | V | Read | |||
| Line 2 to Line 3 Voltage | V | Read | |||
| Line 3 to Line 1 Voltage | V | Read | |||
| Average Line to Line Voltage | V | Read | |||
| Neutral Current | A | Read | |||
| Phase 1 L/N Voltage THD | % | Read | |||
| Phase 2 L/N Voltage THD | % | Read | |||
| Phase 3 L/N Voltage THD | % | Read | |||
| Phase 1 Current THD | % | Read | |||
| Phase 2 Current THD | % | Read | |||
| Phase 3 Current THD | % | Read | |||
| Average Line to Neutral Voltage THD | % | Read | |||
| Average Line Current THD | % | Read | |||
| Phase 1 Current Demand | A | Read | |||
| Phase 2 Current Demand | A | Read | |||
| Phase 3 Current Demand | A | Read | |||
| Maximum Phase 1 Current Demand | A | Read | |||
| Maximum Phase 2 Current Demand | A | Read | |||
| Maximum Phase 3 Current Demand | A | Read | |||
| Line 1 to Line 2 Voltage THD | % | Read | |||
| Line 2 to Line 3 Voltage THD | % | Read | |||
| Line 3 to Line 1 Voltage THD | % | Read | |||
| Average Line to Line Voltage THD | % | Read | |||
| Total Active Energy | kWh | Read | |||
| Total Reactive Energy | kvarh | Read | |||
| L1 Import Active Energy | kWh | Read | |||
| L2 Import Active Energy | kWh | Read | |||
| L3 Import Active Energy | kWh | Read | |||
| L1 Export Active Energy | kWh | Read | |||
| L2 Export Active Energy | kWh | Read | |||
| L3 Export Active Energy | kWh | Read | |||
| L1 Total Active Energy | kWh | Read | |||
| L2 Total Active Energy | kWh | Read | |||
| L3 Total Active Energy | kWh | Read | |||
| L1 Import Reactive Energy | kvarh | Read | |||
| L2 Import Reactive Energy | kvarh | Read | |||
| L3 Import Reactive Energy | kvarh | Read | |||
| L1 Export Reactive Energy | kvarh | Read | |||
| L2 Export Reactive Energy | kvarh | Read | |||
| L3 Export Reactive Energy | kvarh | Read | |||
| L1 Total Reactive Energy | kvarh | Read | |||
| L2 Total Reactive Energy | kvarh | Read | |||
| L3 Total Reactive Energy | kvarh | Read | |||
| L1 Voltage Harmonic 2 | % | Read | |||
| L1 Voltage Harmonic 3 | % | Read | |||
| L1 Voltage Harmonic 4 | % | Read | |||
| L1 Voltage Harmonic 5 | % | Read | |||
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| L1 Voltage Harmonic 11 | % | Read | |||
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| L2 Voltage Harmonic 2 | % | Read | |||
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| L3 Voltage Harmonic 2 | % | Read | |||
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| L1 Current Harmonic 2 | % | Read | |||
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| L3 Current Harmonic 61 | % | Read | |||
| L3 Current Harmonic 62 | % | Read | |||
| L3 Current Harmonic 63 | % | Read | |||
| L1 Voltage Total Harmonic | % | Read | |||
| L2 Voltage Total Harmonic | % | Read | |||
| L3 Voltage Total Harmonic | % | Read | |||
| L1 Current Total Harmonic | % | Read | |||
| L2 Current Total Harmonic | % | Read | |||
| L3 Current Total Harmonic | % | Read | |||
| DI-1 Status | Read | ||||
| DI-2 Status | Read | ||||
| DI-3 Status | Read | ||||
| DI-4 Status | Read | ||||
| DO-1 Output | Read and write | ||||
| DO-2 Output | Read and write | ||||
| Demand Time | min | Read | |||
| Demand Period | min | Read and write | |||
| Demand Slide Time | min | Read and write | |||
| Demand Calculation Method | Read and write | ||||
| System Type | Read and write | ||||
| Key Parameter Programming Authorization | Read and write | ||||
| Parity and Stop Bits | Read and write | ||||
| Modbus Address | Read and write | ||||
| Password | Read and write | ||||
| Network Baud Rate | Read and write | ||||
| PT1 Primary Voltage | V | Read and write | |||
| PT2 Secondary Voltage | V | Read and write | |||
| CT1 Primary Current | A | Read and write | |||
| CT2 Secondary Current | A | Read and write | |||
| Current Direction Correction | Read and write | ||||
| Automatic Scroll Display Time | s | Read and write | |||
| Backlight Time | min | Read and write | |||
| DO-1 Mode | Read and write | ||||
| DO-2 Mode | Read and write | ||||
| DO-1 Pulse Duration | ms | Read and write | |||
| DO-2 Pulse Duration | ms | Read and write | |||
| DI Filter Time | ms | Read and write | |||
| DI-1 Count | Read and write | ||||
| DI-2 Count | Read and write | ||||
| DI-3 Count | Read and write | ||||
| DI-4 Count | Read and write | ||||
| DO-1 Alarm Parameter | Read and write | ||||
| DO-1 Action Delay | ms | Read and write | |||
| DO-1 High Value to Close | Read and write | ||||
| DO-1 High Value to Open | Read and write | ||||
| DO-1 Low Value to Open | Read and write | ||||
| DO-1 Low Value to Close | Read and write | ||||
| DO-2 Alarm Parameter | Read and write | ||||
| DO-2 Action Delay | ms | Read and write | |||
| DO-2 High Value to Close | Read and write | ||||
| DO-2 High Value to Open | Read and write | ||||
| DO-2 Low Value to Open | Read and write | ||||
| DO-2 Low Value to Close | Read and write | ||||
| DO-1 Alarm Status | Read | ||||
| DO-2 Alarm Status | Read | ||||
| SOE 01 Type and Cause | Read | ||||
| SOE 01 Year and Month | Read | ||||
| SOE 01 Day and Hour | Read | ||||
| SOE 01 Minute and Second | Read | ||||
| SOE 02 Type and Cause | Read | ||||
| SOE 02 Year and Month | Read | ||||
| SOE 02 Day and Hour | Read | ||||
| SOE 02 Minute and Second | Read | ||||
| SOE 03 Type and Cause | Read | ||||
| SOE 03 Year and Month | Read | ||||
| SOE 03 Day and Hour | Read | ||||
| SOE 03 Minute and Second | Read | ||||
| SOE 04 Type and Cause | Read | ||||
| SOE 04 Year and Month | Read | ||||
| SOE 04 Day and Hour | Read | ||||
| SOE 04 Minute and Second | Read | ||||
| SOE 05 Type and Cause | Read | ||||
| SOE 05 Year and Month | Read | ||||
| SOE 05 Day and Hour | Read | ||||
| SOE 05 Minute and Second | Read | ||||
| SOE 06 Type and Cause | Read | ||||
| SOE 06 Year and Month | Read | ||||
| SOE 06 Day and Hour | Read | ||||
| SOE 06 Minute and Second | Read | ||||
| SOE 07 Type and Cause | Read | ||||
| SOE 07 Year and Month | Read | ||||
| SOE 07 Day and Hour | Read | ||||
| SOE 07 Minute and Second | Read | ||||
| SOE 08 Type and Cause | Read | ||||
| SOE 08 Year and Month | Read | ||||
| SOE 08 Day and Hour | Read | ||||
| SOE 08 Minute and Second | Read | ||||
| SOE 09 Type and Cause | Read | ||||
| SOE 09 Year and Month | Read | ||||
| SOE 09 Day and Hour | Read | ||||
| SOE 09 Minute and Second | Read | ||||
| SOE 10 Type and Cause | Read | ||||
| SOE 10 Year and Month | Read | ||||
| SOE 10 Day and Hour | Read | ||||
| SOE 10 Minute and Second | Read | ||||
| SOE 11 Type and Cause | Read | ||||
| SOE 11 Year and Month | Read | ||||
| SOE 11 Day and Hour | Read | ||||
| SOE 11 Minute and Second | Read | ||||
| SOE 12 Type and Cause | Read | ||||
| SOE 12 Year and Month | Read | ||||
| SOE 12 Day and Hour | Read | ||||
| SOE 12 Minute and Second | Read | ||||
| SOE 13 Type and Cause | Read | ||||
| SOE 13 Year and Month | Read | ||||
| SOE 13 Day and Hour | Read | ||||
| SOE 13 Minute and Second | Read | ||||
| SOE 14 Type and Cause | Read | ||||
| SOE 14 Year and Month | Read | ||||
| SOE 14 Day and Hour | Read | ||||
| SOE 14 Minute and Second | Read | ||||
| SOE 15 Type and Cause | Read | ||||
| SOE 15 Year and Month | Read | ||||
| SOE 15 Day and Hour | Read | ||||
| SOE 15 Minute and Second | Read | ||||
| SOE 16 Type and Cause | Read | ||||
| SOE 16 Year and Month | Read | ||||
| SOE 16 Day and Hour | Read | ||||
| SOE 16 Minute and Second | Read | ||||
| SOE 17 Type and Cause | Read | ||||
| SOE 17 Year and Month | Read | ||||
| SOE 17 Day and Hour | Read | ||||
| SOE 17 Minute and Second | Read | ||||
| SOE 18 Type and Cause | Read | ||||
| SOE 18 Year and Month | Read | ||||
| SOE 18 Day and Hour | Read | ||||
| SOE 18 Minute and Second | Read | ||||
| SOE 19 Type and Cause | Read | ||||
| SOE 19 Year and Month | Read | ||||
| SOE 19 Day and Hour | Read | ||||
| SOE 19 Minute and Second | Read | ||||
| SOE 20 Type and Cause | Read | ||||
| SOE 20 Year and Month | Read | ||||
| SOE 20 Day and Hour | Read | ||||
| SOE 20 Minute and Second | Read | ||||
| SOE 21 Type and Cause | Read | ||||
| SOE 21 Year and Month | Read | ||||
| SOE 21 Day and Hour | Read | ||||
| SOE 21 Minute and Second | Read | ||||
| SOE 22 Type and Cause | Read | ||||
| SOE 22 Year and Month | Read | ||||
| SOE 22 Day and Hour | Read | ||||
| SOE 22 Minute and Second | Read | ||||
| SOE 23 Type and Cause | Read | ||||
| SOE 23 Year and Month | Read | ||||
| SOE 23 Day and Hour | Read | ||||
| SOE 23 Minute and Second | Read | ||||
| SOE 24 Type and Cause | Read | ||||
| SOE 24 Year and Month | Read | ||||
| SOE 24 Day and Hour | Read | ||||
| SOE 24 Minute and Second | Read | ||||
| SOE 25 Type and Cause | Read | ||||
| SOE 25 Year and Month | Read | ||||
| SOE 25 Day and Hour | Read | ||||
| SOE 25 Minute and Second | Read | ||||
| SOE 26 Type and Cause | Read | ||||
| SOE 26 Year and Month | Read | ||||
| SOE 26 Day and Hour | Read | ||||
| SOE 26 Minute and Second | Read | ||||
| SOE 27 Type and Cause | Read | ||||
| SOE 27 Year and Month | Read | ||||
| SOE 27 Day and Hour | Read | ||||
| SOE 27 Minute and Second | Read | ||||
| SOE 28 Type and Cause | Read | ||||
| SOE 28 Year and Month | Read | ||||
| SOE 28 Day and Hour | Read | ||||
| SOE 28 Minute and Second | Read | ||||
| SOE 29 Type and Cause | Read | ||||
| SOE 29 Year and Month | Read | ||||
| SOE 29 Day and Hour | Read | ||||
| SOE 29 Minute and Second | Read | ||||
| SOE 30 Type and Cause | Read | ||||
| SOE 30 Year and Month | Read | ||||
| SOE 30 Day and Hour | Read | ||||
| SOE 30 Minute and Second | Read | ||||
| Clock Seconds and Minutes | Read and write | ||||
| Clock Hour and Weekday | Read and write | ||||
| Clock Day and Month | Read and write | ||||
| Clock Year | Read and write | ||||
| Running Time Days | Read and write | ||||
| Running Time Hours and Minutes | Read and write | ||||
| Ethernet IP Address Word 1 | Read and write | ||||
| Ethernet IP Address Word 2 | Read and write | ||||
| Ethernet Subnet Mask Word 1 | Read and write | ||||
| Ethernet Subnet Mask Word 2 | Read and write | ||||
| Ethernet Default Gateway Word 1 | Read and write | ||||
| Ethernet Default Gateway Word 2 | Read and write | ||||
| Ethernet IP Port | Read and write | ||||
| Ethernet TCP/IP Working Mode | Read and write | ||||
| Reset Historical Data | Write | ||||
| Meter Info | Read | ||||
| Tariff Table Word 1 | Read and write | ||||
| Tariff Table Word 2 | Read and write | ||||
| Tariff Table Word 3 | Read and write | ||||
| Tariff Table Word 4 | Read and write | ||||
| Tariff Table Word 5 | Read and write | ||||
| Tariff Table Word 6 | Read and write | ||||
| Tariff Table Word 7 | Read and write | ||||
| Tariff Table Word 8 | Read and write | ||||
| Tariff Table Word 9 | Read and write | ||||
| Tariff Table Word 10 | Read and write | ||||
| Tariff Table Word 11 | Read and write | ||||
| Tariff Table Word 12 | Read and write | ||||
| Tariff Table Word 13 | Read and write | ||||
| Tariff Table Word 14 | Read and write | ||||
| Tariff Table Word 15 | Read and write | ||||
| Continuous Running Time | h | Read and write | |||
| Serial Number | Read |
Loading registers…
Send your device list
If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Show power, energy and power factor per phase of a distribution board on a ModbusCloud dashboard.
- Send an alarm when the current on one phase or the total demand passes a threshold you choose.
- Keep a year of import and export energy per phase to compare tenants, machines or months.
- Watch voltage THD and harmonics to spot a load that pollutes the network.
- Count water or gas meter pulses on the digital inputs and log them next to the electrical energy.
- Switch a digital output from ModbusCloud or an automation, for example to shed a load.
Installation
Wire RS485 A and B from the meter to the RS485 port of the ModbusCloud Gateway, with a 120 ohm termination at the end of the bus.
On the meter set the Modbus address (default 1) and check 9600 baud, no parity and 1 stop bit, or the values the rest of the bus uses.
Set the system type and the CT and PT ratio on the meter or later from ModbusCloud, so power and energy are in primary values.
In ModbusCloud add a Modbus device on the Gateway, choose the Weidmüller EM220-RTU template and enter the address.
Check that voltage, current and frequency arrive with plausible values, and that power is positive on a consuming load.
Things to watch for
The meter does not respond on the RS485 bus. What should I check?
Check that address, baud rate, parity and stop bits match the settings in ModbusCloud. Swap A and B if nothing answers, and make sure the bus has a termination resistor at both ends. With even or odd parity the meter always uses 1 stop bit.
Why is the power negative or the power factor sign wrong on one phase?
A current transformer is probably mounted the wrong way round. Turn it, or set Current Direction Correction for that phase. The sign of the power factor follows the direction of the current, positive for forward and negative for reverse.
Why do I get an error when I write the CT ratio or the system type?
These key parameters are protected. Write the meter password (default 1000) to Key Parameter Programming Authorization first, then write the new value. The meter only accepts writes with function code 16, which the template already uses.
Can I run several EM220-RTU meters on one bus?
Yes. Give each meter its own Modbus address from 1 to 247 and add each as a separate Modbus device in ModbusCloud with the same template. Up to 32 devices fit on one RS485 line.
What should I watch out for when writing settings?
A wrong CT or PT ratio changes every power and energy value, and Reset Historical Data clears energy, demand or the event log for good. Read the current value first, write one setting at a time and check the result on the meter.
Want to see how it works?
