iEM2100 Series Energy Meters

User Manual

Document Reference: 7EN02-0361-00

Date: 05/2015

Safety Precautions

Installation, wiring, testing, and service must be performed in accordance with all local and national electrical codes.

DANGER: HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. Refer to NFPA 70E in the USA, CSA Z462, or applicable local standards.
Turn off all power supplying this device and the equipment in which it is installed before working on the device or equipment.
Always use a properly rated voltage sensing device to confirm power is off.
Do not exceed the device's ratings for maximum limits.
Replace all devices, doors, and covers before turning on power to this equipment.

Failure to follow these instructions will result in death or serious injury.

WARNING: UNINTENDED OPERATION

Do not use the meter for critical control or protection applications where human or equipment safety relies on the operation of the control circuit.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING: INACCURATE DATA RESULTS

Do not rely solely on data displayed on the front panel or in software to determine if the device is functioning correctly or compliant with all applicable standards.
Do not use data displayed on the front panel or in software as a substitute for proper workplace practices or equipment maintenance.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

NOTICE: The meter does not contain any user-serviceable parts. Do not open the meter case or attempt to repair any components. Opening the meter voids the warranty.

Diagnostics error codes: If the meter displays error codes 2 or 3, there is an internal malfunction and the meter must be replaced. Contact your local Schneider Electric representative.

Meter Overview

The meters provide essential measurement capabilities for monitoring a single-phase electrical installation, including current, voltage, and energy.

Key features:

Measurement of active and reactive energy.
Active measurement accuracy: Class 1 (IEC 62053-21) and Class B (EN50470).
Reactive measurement accuracy: Class 2 (IEC 62053-23).
2 tariffs controlled by digital inputs on select models.
MID compliance with select models.
Pulse outputs on select models.
LCD display showing measurements and basic configuration.
Communications via Modbus or M-Bus protocols on select models.

Main characteristics

Function	iEM2110	iEM2135	iEM2150	iEM2155
Direct measurement (up to 63 A)	✔	✔	✔	✔
Four Quadrant Energy measurements	✔	✔	✔	✔
Electrical measurements (I, V, P, PF, F, P, Q)	✔	✔	✔	✔
2 tariffs (Controlled by digital inputs)	2	2	2	2
Pulse outputs	2	-	-	-
Communications Modbus	-	-	✔	✔
Communications M-Bus	-	✔	-	-
MID compliant	✔	✔	✔	✔
Width (18 mm module in DIN rail mounting)	2	2	2	2

Communications via Modbus

Modbus RTU protocol is available on the iEM2150 and iEM2155 models. This section assumes an advanced understanding of Modbus communications.

Ways to use Modbus communication:

Sending commands using the command interface.
Reading Modbus registers.
Reading Device Identification.

Modbus communications settings

Settings	Possible values
Baud rate	9600 Baud, 19200 Baud, 38400 Baud
Parity	Odd, Even, None
Address	1-247

NOTE: The number of stop bits is fixed at 1.

A communications indicator symbol appears on the display when the meter is communicating.

Modbus functions

Function code (Decimal)	Function code (Hexadecimal)	Function name
3	0x03	Read Holding Registers
16	0x10	Write Multiple Registers
43/14	0x2B/0x0E	Read Device Identification

Table format: Register tables include Register Address, Action (R/W/WC), Size, Type, Units, Range, and Description.

Unit table: Data types include UInt16, Int16, UInt32, UInt64, UTF8, Float32, and Bitmap.

Command interface overview

The command interface allows meter configuration by sending specific command requests using Modbus function 16.

Command request: A command block consists of a command number and parameters.

Command result: Obtained by reading registers 5375 and 5376. Result codes indicate success or failure.

Communications Setup

Command Number	Action (R/W)	Size	Type	Units	Range	Description
5000	W	1	UInt16	-	-	(Reserved)
	W	1	UInt16	-	-	(Reserved)
	W	1	UInt16	-	1-247	Address
	W	1	UInt16	-	0, 1, 2	Baud Rate (0=9600, 1=19200, 2=38400)
	W	1	UInt16	-	0, 1, 2	Parity (0=Even, 1=Odd, 2=None)
	W	1	UInt16	-	-	(Reserved)

Modbus register list

System:

Register Address	Action (R/W/WC)	Size	Type	Units	Description
30	R	20	UTF8	-	Meter Name
50	R	20	UTF8	-	Meter Model
70	R	20	UTF8	-	Manufacturer
130	R	2	UInt32	-	Serial Number
132, 133	R	4	DATETIME	-	Date of Manufacture
136	R	5	UTF8	-	Hardware Revision
1637	R	1	UInt16	-	Firmware version

Meter Setup and Status:

Register Address	Action (R/W/WC)	Size	Type	Units	Description
2014	R	1	UInt16	-	Number of Phases (always 1)
2015	R	1	UInt16	-	Number of Wires (always 2)
2016	R/WC	1	UInt16	-	Power System (always 0 = 1PH2W L-N)
2017	R/WC	1	UInt16	Hz	Nominal Frequency (always 50 Hz)

Command Interface:

Register Address	Action (R/W/WC)	Size	Type	Units	Description
5250	R/W	1	UInt16	-	Requested Command
5252 - 5374	R/W	1	UInt16	-	Command Parameter 001 - 123
5375	R	1	UInt16	-	Command Status
5376	R	1	UInt16	-	Command result codes
5377 - 5499	R/W	1	UInt16	-	Command Data 001-123

Communication:

Register Address	Action (R/W/WC)	Size	Type	Units	Description
6500	R	1	UInt16	-	Protocol (0 = Modbus)
6501	R/WC	1	UInt16	-	Address
6502	R/WC	1	UInt16	-	Baud Rate (0=9600, 1=19200, 2=38400)
6503	R/WC	1	UInt16	-	Parity (0=Even, 1=Odd, 2=None)

Tariff Input (iEM2155):

Register Address	Action (R/W/WC)	Size	Type	Units	Description
7274	R	1	UInt16	-	Digital Input Control Mode (always set to 2 = Multi Tariff Control)
8905	R	2	UInt16	-	Digital Input Status (0 = relay open, 1 = relay closed)

Meter Data:

Current, voltage, power, power factor and frequency:

Register Address	Action (R/W/WC)	Size	Type	Units	Description
3000	R	2	Float32	A	Current
3028	R	2	Float32	V	Voltage
3054	R	2	Float32	kW	Active Power
3068	R	2	Float32	KVAR	Reactive Power
3076	R	2	Float32	KVA	Apparent Power
3084	R	2	Float32	-	Power Factor
3110	R	2	Float32	Hz	Frequency

Energy and energy by tariff:

Energy values are available in both unsigned 64-bit integer and 32-bit floating point format.

Energy values - 64-bit integer:

Register Address	Action (R/W/WC)	Size	Type	Units	Description
3204	R	4	UInt64	Wh	Total Active Energy Import
3208	R	4	UInt64	Wh	Total Active Energy Export
3220	R	4	UInt64	VARh	Total Reactive Energy Import
3224	R	4	UInt64	VARh	Total Reactive Energy Export
3256	R	4	UInt64	Wh	Partial Active Energy Import
3272	R	4	UInt64	VARh	Partial Reactive Energy Import

Energy by Tariff (iEM2155):

Register Address	Action (R/W/WC)	Size	Type	Units	Description
4191	R	1	UInt16	Wh	Tariff active rate (1: tariff A, 2: tariff B)
4196	R	4	UInt64	Wh	Tariff A Active Energy Import
4200	R	4	UInt64	Wh	Tariff B Active Energy Import

Energy values – 32-bit floating point:

Register Address	Action (R/W/WC)	Size	Type	Units	Description
45100	R	2	Float32	Wh	Total Active Energy Import
45102	R	2	Float32	Wh	Total Active Energy Export
45104	R	2	Float32	VARh	Total Reactive Energy Import
45106	R	2	Float32	VARh	Total Reactive Energy Export
45108	R	2	Float32	Wh	Partial Active Energy Import
45110	R	2	Float32	VARh	Partial Reactive Energy Import

Energy by Tariff (iEM2155):

Register Address	Action (R/W/WC)	Size	Type	Units	Description
45120	R	2	Float32	Wh	Tariff A Active Energy Import
45122	R	2	Float32	Wh	Tariff B Active Energy Import

Read Device Identification

The meters support the Read Device Identification function with VendorName, ProductCode, and Revision Number.

Object ID	Name/Description	Length	Value	Note
0x00	VendorName	16	Schneider Electric	-
0x01	ProductCode	09	A9MEM2150 / A9MEM2155	Identical to catalog number.
0x02	MajorMinor Revision	04	V1.0	Equivalent to X.Y in register 1637.

Read Device ID codes 01 and 04 are supported:

01 = request to get basic device identification (stream access).
04 = request to get one specific identification object (individual access).

The Modbus request and response are compliant with the Modbus Application Protocol Specification.

Communications via M-Bus

M-Bus is a master/slave protocol. Data is transferred using hexadecimal telegrams. Communications via M-Bus protocol is available on the iEM2135.

This section is intended for users with an advanced understanding of M-Bus protocol.

Configuring basic communications settings

Setting	Possible values
Baud rate	300, 600, 1200, 2400, 4800, 9600
Primary address	1-250

NOTE: The meter is shipped with address 0. Change the address to 1-250 using the display or communications.

Key terms

Term	Definition
C-Field	The control or function field of the telegram, providing information about the telegram's direction, status, and function.
CI-Field	The control information field, defining the type and sequence of data.
Fixed data header	Contains device and manufacturer identification information.
DIF	Data information field, containing information about the data's function and format.
DIFE	Data information field extension, providing additional data information like tariff and subunit.
Master	A device that issues commands and receives responses from slave devices.
Slave	A device that provides information or performs actions in response to requests from the master.
VIF/VIFE	Value information field and extension, containing information about the value (e.g., energy or power).

M-Bus protocol support

The meter supports M-Bus protocol with Mode 1 communications (least significant bit first) and various telegram formats (single character, short frame, long frame). Function codes include SND_NKE, SND_UD, REQ_UD2, RSP_UD, and broadcast telegrams.

M-Bus protocol implementation

M-Bus tool for viewing data and configuring the meter: A graphical user interface is available at www.schneider-electric.com to view meter data and configure settings.

A communications indicator symbol appears on the display when the meter is communicating.

Variable data structure telegram information

Fixed data header includes Identification No., Manufacturer, Version, Medium, Access No., Status, and Signature.

Data record header information:

Data formats used by the meter (DIF bits 3-0): 8-bit integer, 16-bit integer, 32-bit integer, 32-bit real, etc.
Data function types used by the meter (DIF bits 5-4): Instantaneous.
Primary VIF used by the meter: Energy, Power, Bus address, etc.
Primary VIFE codes used by the meter.

Telegram information for data records

Details telegram information for data records, including data format, Primary VIF, Primary VIFE codes, and Manufacturer-specific VIFE codes.

Meter information:

Data format	Primary VIF Extension	Description
03	E0001 0111 (1B)	Meter error codes.

Energy and energy by tariff measurements:

Data format	DIFE	Primary VIF	Primary VIFE	Manufacturer-specific VIFE	Description
07	-	03	-	E000 1001 (09)	Total active energy import
07	-	07	83	E000 1001 (09)	Total active energy export
87	40	03	-	E000 1101 (0D)	Total reactive energy import
87	40	87	83	E000 1101 (0D)	Total reactive energy export
07	-	03	-	E001 0000 (10)	Partial active energy import
87	-	03	-	E001 0000 (10)	Partial reactive energy import
03	-	87	10	-	Active tariff (1 = rate A, 2 = rate B)
87	20	03	-	E001 0001 (11)	Rate A (tariff 1) active energy import
87	20	03	-	E001 0001 (11)	Rate B (tariff 2) active energy import

Instantaneous measurements:

Data format	DIFE	Primary VIF	Primary VIFE	Manufacturer-specific VIFE	Description
05	-	2E	-	-	Active power
85	40	2E	-	-	Reactive power
85	80 40	2E	-	-	Apparent power
05	-	E100 1001 (C9)	E000 0100 (04)	-	Voltage L-N
05	-	E101 1100 (DC)	E000 0000 (00)	-	Current
05	-	E000 1010 (0A)	-	-	Power factor
05	-	E000 1011 (0B)	-	-	Frequency

Meter status information: Use information to read system and status from the meter.

Power system configuration information:

Data format	Manufacturer-specific VIFE	Description
03	E010 0011 (23)	Power system configuration (always 0 = 1PH2W L-N)
03	E010 0010 (22)	Number of wires (always 2)
03	E010 0001 (21)	Number of phases (always 1)
03	E010 0100 (24)	Nominal frequency (always 50)

Digital input (tariff) status information:

Data format	Primary VIFE	Manufacturer-specific VIFE	Description
03	E001 1011 (1B)	-	Digital input control mode (always 2 = Multi Tariff control)
02	-	E011 0010 (32)	Digital input status (0 = relay open, 1 = relay closed)
03	-	E011 0000 (30)	Digital input association with partial energy data reset (always 0 = Digital input is not associated with the partial energy reset)

Telegram information for meter configuration:

Use provided information to write to the meter using a SND_UD function. The M-Bus tool from www.schneider-electric.com can also be used for configuration.

Supported VIFE codes for meter configuration:

VIFE code	Action	Description
E000 0000 (00)	Write and replace	Replaces the old value with the new value.
E000 0111 (07)	Clear	Resets an accumulated value to 0 (zero).

Example configuration telegram: Shows a telegram to reset partial energy on a slave with primary address 4.

Communications setup:

Setting the primary address:

SND_UD code	Data format	Primary VIF	Range/options	Description
00	01	7A	0-250	Primary address

Setting the baud rate:

Baud rate	Hex value for Cl-field
300	B8
600	B9
1200	BA
2400	BB
4800	BC
9600	BD

Resets:

SND_UD code	Data format	Primary VIFE	Manufacturer-specific VIFE	Description
07	00	-	E000 1101 (8D)	Resets partial energy accumulation to 0 (imported/exported active and reactive energy).

M-Bus tool for data display and meter configuration: The M-Bus tool provides a graphical user interface for viewing meter data and configuring settings. Obtain it from www.schneider-electric.com.

If you access a different meter without closing and re-opening the M-Bus tool, the fields displayed may not match the device. The M-Bus tool may indicate a setting was changed without the setting on the meter actually changing.

NOTICE: INACCURATE DEVICE SETTINGS. Do not rely on the configuration information displayed in the M-Bus tool to determine if the associated device is correctly configured. Failure to follow these instructions can result in inaccurate device settings and data results.

Installing the M-Bus tool:

Navigate to the location where you saved the installation files.
Double-click setup.exe.
Confirm the installation location.
Click Next to begin installation.
Click Close.

Accessing the meter using the tool:

Connect the meter to a level converter or gateway.
Set the device address to a value other than 0 using the HMI.
Install the M-Bus tool.

Open the Mbus iEM2150 config tool.
Select the correct port and baud rate.
Click Test Com.
Type the device address in the Address field.
Select the communication mode: Monitor(Automatic), Monitor(Manual), or Config.
Click OK.

Viewing meter data using the M-Bus tool:

Automatic mode: Select the update interval.
Manual mode: Press Req_UD2 to request data.

The tool has tabs for Meter Info, Energy Measure, RMS Measure, and Meter Status.

Configuring the meter using the M-Bus tool:

Select Setup > Config to switch to configuration mode.
Set the values and click Send.

Troubleshooting

Communications troubleshooting:

Check if the meter is on and the LCD is functioning.
Verify correct wiring to the communications network.
Ensure the meter address is correct and unique on the loop.
For Modbus meters: Check cable length (< 1200m, max 32 devices) and ensure parity, baud rate, and stop bits are consistent.
For M-Bus meters: Ensure the master has sufficient power and that the baud rate is consistent.

If issues persist, contact Technical Support.

Legal information

Schneider Electric brand and trademarks are the property of Schneider Electric SA and its subsidiaries. This guide and its content are protected by intellectual property laws. Reproduction or commercial use without permission is prohibited.

Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. Schneider Electric assumes no responsibility for consequences arising from the use of this material.

As standards change, please confirm information with the latest publications.

Additional information

Title of documentation	Reference number
Installation sheet	NHA4935401-00

Download technical publications and information from www.schneider-electric.com.

Modbus and Schneider Electric are trademarks or registered trademarks of Schneider Electric.

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