Siemens MD-12HD, MD-48HD User Manual

ii Siemens Industry, Inc.

User Guide

MD-12HD
MD-48HD
Networked Metering Systems

A6V11564207

Siemens Industry, inc. ii

User Guide: MD-xxHD Networked Power Meters ©2019 Siemens. All rights reserved.
This manual may not be reproduced or distributed without written permission from Siemens.
Content in this manual has been reproduced with permission from Dent Instruments, Inc.
View Point HD™ is a trademark of Dent Instruments, Inc.
Windows®, Windows® 7, Windows® 8, and Windows® 10 are registered trademarks of Microsoft

Corporation.

iii Siemens Industry, Inc.

Table of Contents

Table of Contents .......................................................................................................... iii

Introduction ................................................................................................................... 6

Unpacking the Unit ..................................................................................................... 6

MD-xxHD Components .............................................................................................. 7

Alternate Product Configuration .............................................................................. 8

MD-xxHD Meter Safety Summary and Specifications ............................................... 9

Symbols on Equipment .............................................................................................. 9

Symbols in Documentation ........................................................................................ 9

Maintenance .............................................................................................................. 10

Meter Safety ................................................................................................................... 11

Planning For Field Installation ..................................................................................... 12

Project Manager Aspects ........................................................................................... 12

Configuration and Data Viewing Options ................................................................ 12

Information Access by Interface Type ..................................................................... 13

Meter Configuration Overview ................................................................................... 14

Meter Installation Overview ....................................................................................... 14

Verification and Communication Overview ................................................................ 15

RTU Programming and Scripting Overview ............................................................... 15

Meter Configuration - Details ....................................................................................... 16

Install the ViewPoint HD Software ............................................................................. 16

Typical Installation ................................................................................................... 16

Custom Installation .................................................................................................. 17

Installation Trouble Shooting ................................................................................... 17

Connection and Configuration Options Using ViewPoint HD ................................. 18

USB Connection (Power and Communications) ..................................................... 18

Ethernet Network Connections ............................................................................... 20

Dynamic Host Configuration Protocol (DHCP): ...................................................... 20

Direct ....................................................................................................................... 20

LCD Display ............................................................................................................ 20

No LCD Display ....................................................................................................... 21

Network Scan .......................................................................................................... 22

Launch Configurator ................................................................................................ 22

ViewPoint HD Software Overview ............................................................................. 23

ViewPoint HD Documentation ................................................................................. 24

ViewPoint HD™ Documentation—Instructional Videos .......................................... 25

Configuring Electrical Components using ViewPoint HD ........................................ 26

Configuring Communications using Viewpoint HD ................................................. 27

Configuring Alarms in ViewPoint HD ....................................................................... 28

Configuration Input Methods ...................................................................................... 28

Setting the Real Time Clock ...................................................................................... 29

Siemens Industry, inc. iv

Real Time Clock Power Source ................................................................................. 29

Retrieving Interval Data ........................................................................................... 30

MD-xxHD Web App Overview ................................................................................... 31

Connect to Web App using USB ............................................................................. 31

Connect to Web App using Ethernet ....................................................................... 31

Authentication .......................................................................................................... 31

MacOS Users ............................................................................................................. 32

Meter Installation - Details............................................................................................ 33

Meter Mounting Configurations .................................................................................. 33

Installation Sequence .............................................................................................. 34

Connecting Voltage ................................................................................................. 36

Wiring the MD-xxHD Meter in a 3-wire, Split ɸ Service Panel ................................... 37

Wiring the MD-xxHD Meter in a 4-wire, 3 ɸ Service Panel ........................................ 38

Current Transformer Basics ....................................................................................... 39

Wiring the CTs to the MD-xxHD Meter ...................................................................... 40

Communication and Verification - Details .................................................................. 41

Physical Connections on an RS-485 Multidrop Network ........................................... 41

Communication Verification ....................................................................................... 42

ViewPoint HD/MD-xxHD Web App .......................................................................... 43

Physical Interface Verification .................................................................................... 43

Serial Setup Verification .......................................................................................... 43

LAN Ethernet Network Verification .......................................................................... 43

DHCP ...................................................................................................................... 43

Static IP ................................................................................................................... 43

Protocol Verification ................................................................................................... 44

Modbus Settings ........................................................................................................ 44

Modbus RTU Settings ............................................................................................. 44

Modbus TCP Settings ............................................................................................. 44

BACnet Settings ......................................................................................................... 44

BACnet MSTP ......................................................................................................... 44

BACnet IP ................................................................................................................ 44

Pulse Inputs ............................................................................................................... 45

ALARM (SPDT) .......................................................................................................... 45

12 Volt Auxiliary Power .............................................................................................. 46

Access Restriction Limitations ................................................................................... 46

Security PIN Protection .............................................................................................. 46

Using the Permission Registers .............................................................................. 46

Read Only Permission Register .............................................................................. 47

Read/Write Permission Register ............................................................................. 47

Reading PINs over Modus ...................................................................................... 47

ViewPoint HD – Unrestricted Access ...................................................................... 47

Verification of Installation ........................................................................................... 48

Installation Phase Verification ................................................................................. 48

Phase Checking By Phasor Plot ............................................................................. 49

v Siemens Industry, Inc.

CT Orientation Check ................................................................................................ 50

Power Factor Convention .......................................................................................... 51

Total Harmonic Distortion .......................................................................................... 51

Pre-Processing Aids .................................................................................................. 52

Snap Thresholds ..................................................................................................... 52

Multipliers ................................................................................................................ 52

CT Phase Shifts ...................................................................................................... 52

Demand ................................................................................................................... 52

RTU Programming and Scripting - Details ................................................................. 53

Register Organization ................................................................................................ 53

https://www.dentinstruments.com/siemens ............................................................. 53

Element vs. System Scope ........................................................................................ 53

Element ................................................................................................................... 53

Channel ................................................................................................................... 53

System .................................................................................................................... 54

Configuring Element and Channel Register for Service Types ................................. 54

Modbus Absolute Address/BACnet Object Assignments for Setting up

Service Types ....................................................................................................... 54

Configurations ......................................................................................................... 54

Configuring System Registers ................................................................................. 56

Modbus Protocol Commands .................................................................................... 56

Slave Address ......................................................................................................... 56

Modbus String Entry ................................................................................................ 56

Floating Point Registry Entry ..................................................................................... 60

Commands Requiring a Processor Reset ................................................................. 63

BACnet ....................................................................................................................... 64

BACnet Segmentation ............................................................................................. 64

BACnet Structured View ......................................................................................... 64

Appendix A—MD-xxHD LCD Menu Navigation .......................................................... 66

About Meter ............................................................................................................... 66

Menu Navigation ........................................................................................................ 67

Communication Navigation ........................................................................................ 68

Appendix B—Enclosure Dimensions .......................................................................... 69

Appendix C—Mounting Templates ............................................................................. 70

Enclosure Internal Mounting Hole Locations ............................................................. 70

Sheet Metal Plate Mounting Hole Locations .............................................................. 71

Appendix D— MD-xxHD Technical Specifications .................................................... 72

6 Siemens Industry, Inc.

Introduction

There are two meters in the MD-xxHD Series: the MD-12HD and the MD-48HD. These meters monitor
the voltage, current, power, energy, and many other electrical parameters on single and three-phase
electrical systems. A MD-xxHD meter uses direct connections to each phase of the voltage and current
transformers to monitor each phase of the current. Information on energy use, demand, power factor, line
frequency, and more are derived from these voltage and current inputs.

The MD-xxHD meter is not meant to be a standalone energy recorder; rather it is connected as a slave
device to a data logger, Remote Terminal Unit (RTU), or Building Management host network. The
MD-xxHD meter communication interfaces include Ethernet (LAN) or RS-485 serial. BACnet MS/TP and
Modbus RTU are the two communication protocols that operate over an RS-485 serial network and
BACnet IP and Modbus TCP are supported over Ethernet. A USB port is also provided as the preferred
connection for on-site configuration and can be run concurrently with an RTU.

Unpacking the Unit

The MD-xxHD can be ordered with optional product features which are identifiable on the part number
label.

MD - AB HD - X - Y - Z

MD series Power Meter Family

Channel Count (12 or 48)

HD Product Series

Mounting (Case or Plate)

Display (Display or None)

Future Options (None)

MD-xxHD Part Numbering Scheme

Each MD-xxHD meter shipment also includes the following items:

▪ Meter with Options Installed – Serial Number, MAC ID, and FCC ID indicated on side label.
▪ Pluggable Connectors

o MD-48HD (2 voltage, 50 three-position terminals, 3 two-position terminals)
o MD-12HD (1 voltage, 14 three-position terminals, 5 two-position terminals)

▪ Thumb drive containing ViewPoint HD Software, Register List, Manual, Tutorial Videos
▪ Certificate of Calibration (COC)
▪ USB A to B Cable (one per order)

7 Siemens Industry, Inc.

MD-xxHD Components

All user connections are made on the circuit board. Connectors are identified by function and include
polarity markers.

MD-48HD

(Mounting Plate Model MD-48HD-P-D-N Shown)

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Alternate Product Configuration

MD-12HD-C-D-N

(Enclosure with Cover Removed)

9 Siemens Industry, Inc.

MD-xxHD Meter Safety Summary and Specifications

This general safety information
is to be used by both the Logger
operator and servicing
personnel. Siemens assumes no

liability for user’s failure to

comply with these safety
guidelines.

MD-12HD-P-D-N
MD-48HD-P-D-N

MD-12HD-C-D-N, MD-12HD-C-N-N
MD-48HD-C-D-N, MD-48HD-C-N-N

SC1731-EM, SC1732-EM

The MD-xxHD Family conform to
the following:

MD-xxHD Series:
Conforms to

UL Std 61010-1, 3rd Edition

Certified to
CSA Std C22.2 No.
61010-1, 3rd Edition

MD-12HD-P-D-N and MD-48HD-P-D-N meters need to be installed in a user-supplied UL Listed/ uR

recognized enclosure in order to comply with NEC and local electrical codes.

The MD-xxHD is an Over-Voltage Category III device. Use approved protection when operating the device.

CAUTION: THIS METER MAY CONTAIN LIFE THREATENING VOLTAGES. QUALIFIED PERSONNEL

MUST DISCONNECT ALL HIGH VOLTAGE WIRING BEFORE SERVICING THE METER WITH
THE HIGH VOLTAGE TOUCH SAFE COVER REMOVED.

Symbols on Equipment

Denotes caution. See manual for a description of the meanings.

DENOTES HIGH VOLTAGE. RISK OF ELECTRICAL SHOCK. LIFE THREATENING VOLTAGES
MAY BE PRESENT. QUALIFIED PERSONNEL ONLY.

Equipment protected throughout by double insulation (IEC 536 Class II).

Symbols in Documentation

Contains additional information pertinent to current subject

DO NOT EXCEED 346V Line to Neutral or 600 volts Line to Line. This meter is
equipped to monitor loads up to 346V L-N. Exceeding this voltage will cause
damage to the meter and danger to the user. Always use a Potential
Transformer (PT) for voltages in excess of 346V L-N or 600 volts line to line.
The MD-xxHD is a 600 Volt Over Voltage Category III device.

Siemens Industry, inc. 10

Maintenance

There is no required maintenance with the MD-xxHD. Abide by the following items:
Cleaning: No cleaning agents, including water, shall be used on the MD-xxHD.

No accessories are approved for use with the MD-xxHD meter other than those specified in the Siemens
product literature and price sheets.

If the meter appears damaged or defective, first disconnect all power to the meter. Then call or email
technical support for assistance:

Siemens Industry, Inc.
Buffalo Grove, USA
Phone: [phone] – Option 2

https://support.industry.siemens.com

Email: [e-mail]

11 Siemens Industry, Inc.

Meter Safety

Building Service Safety Requirements
(Load Center, etc.)

Equipment intended for use with field-installed current transformers that could be
installed in panel boards or switchgears shall observe the following:

Always open or disconnect circuit from power-distribution system (or service) of building
before installing or servicing current transformers.

A circuit breaker used as a disconnect must meet the requirements of IEC 60947-1 and
IEC 60947-3 (Clause 6.11.4.2)

Current transformers may not be installed in equipment where they exceed 75 percent
of the wiring space of any cross-sectional area within the equipment.

Current transformers may not be installed in an area where they block ventilation
openings.

Current transformers may not be installed in an area of breaker arc venting.
Not suitable for Class 2 wiring method nor intended for connection to Class 2

equipment.
Secure current transformer and route conductors so that they do not directly contact live

terminals or bus.
CTs shall be listed to UL2808

Meter Installation Safety Requirements

MD-xxHD meters must be installed in accordance with local electrical codes.
Use copper conductors only.
Connection to the mains terminals shall be made with 14 AWG minimum wire gauge.
External secondary inputs and outputs should be connected to devices meeting the

requirements of IEC 60950.
The following additional requirements apply for recognized board versions of the MD-

xxHD meter:

1. For use only with Listed Energy-monitoring Current Transformers.

2. Associated leads of the current transformers shall be maintained within the same overall
enclosure.

3. Unless the current transformers and its leads have been evaluated for REINFORCED
INSULATION, the leads must be segregated or insulated from different circuits.

4. The current transformers are intended for installation within the same enclosure as the
equipment. These may not be installed within switchgears and panel boards or similar.

Siemens Industry, inc. 12

Planning For Field Installation

Project Manager Aspects

Meter installation often includes coordination between individuals or groups of people with different
responsibilities. Spend a few minutes considering who will be executing each portion of the installation
and what tools are needed at each stage. Things to consider include determining how to communicate
with the meter, setting address configuration, installing ViewPoint HD, access to PIN numbers, etc. The
more tasks completed before installation the fewer tasks will be needed in the field, where most mistakes
happen. The following section gives an overview of typical process activities followed by details in the
next section.

Configuration and Data Viewing Options

The MD-xxHD meter has three methods for configuration and data viewing. The most powerful interface
is a Microsoft Windows application (ViewPoint HD) that runs on PCs or Tablets. ViewPoint HD is
encouraged for complex installations and is required for configuring advanced functions like alarms. The
second interface is the MD-xxHD Web App and is intended for smart phones or tablets that can connect
over USB, or Ethernet. The third interface (LCD) is an optional component and is intended for intermittent
end-user observation and is restricted in capability. The RTU can also be used for configuration if
communication settings are already established.The feature set of each interface is summarized next.

13 Siemens Industry, Inc.

Information Access by Interface Type

Siemens Interface Options

Customer

Device

PC or Laptop Running

ViewPoint HD

Smart Device or Tablet

via

MD-xxHD Web App

LCD on Meter

(if equipped)

RTU

(Host System)

Modbus/BACnet

When

Used

Meter Setup

Field Visit

Field Visit

End User

Building System

Real Time Values

All Meter Parameters

Waveform Capture
Harmonic Analysis

All Element View

Phasor Plot

Alarms

All Meter Parameters

Single Element View

Voltage
Current

VA
VAR
kWh

Single Element View

All Meter Parameters

Configuration

Entire Meter

Visual Guides

Copy/Paste

Entire Meter
Sans Alarms

Text-Based

Communications Only

Entire Meter

Register-Based

Security PINs

Enforced

Factory Support –

Level 3

Read Only – Level 1*

Read/Write – Level 2*

Read Only – Level 1*

Read/Write Level 2*

(limited to

communication)

Factory Support –

Level 3

* If PINs are configured

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Meter Configuration Overview

▪ Work performed ahead of the installation saves time in the field and results in fewer

mistakes!

Tools

Typical Work

• Desktop or Laptop PC

• USB Type AB Cable (preferred) or

Ethernet and USB wall charger
(> 500 mA)

• Thumb Drive included with order
(ViewPoint HD Installer) or access to

https://www.dentinstruments.com/siemens

• Electrical Schematics of project

• Installation of ViewPoint HD Software

• Connect USB/Ethernet cable from PC

to meter

• Establish communication with meter

• Firmware update (if desired)

• Configure software for anticipated

meter setup

• Field wiring documentation

• Set alarms

• Set security PINs

Meter Installation Overview

▪ Performed by licensed electrician.

Tools

Typical Work

• Mounting hardware (customer
supplied)

• Wiring and supplies, labels, wire ties

• Tablet, Smart Device, or

Laptop PC

• Multi Meter, Current Clamp

• Camera

• Mechanical mounting

• Electrical installation

• Install voltage cover

• Apply power to meter

• Confirm basic operation of meter

15 Siemens Industry, Inc.

Verification and Communication Overview

▪ Can be modified with power applied to the meter.

Tools

Typical Work

• Tablet, Smart Device (Web Page
Based), or
Laptop computer (ViewPoint HD
Software)

• On site troubleshooting

• Multi Meter, Current Clamp

• Camera

• Locate the power meter

• Confirm RTU device

• Add wire terminations (if required)

• Confirm meter communication

settings

• Meter health metrics (check for setup
errors)

• Analytics (ViewPoint HD)

• Correct instrumentation

• Set alarms

• Set security PINs

• Checklist

RTU Programming and Scripting Overview

Tools

Typical Work

• Laptop PC (Remote Access to RTU)

• Remote troubleshooting

• Register List

• Confirm meter communication

settings

• Confirm communication protocols

• Exercise remote connectivity

• Run configuration scripting

• Set alarms

• Set security PINs

• Confirm data integrity

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Meter Configuration - Details

This section is written to support setting up the MD-xxHD in an office environment and
configuring the power meter for a pre-determined configuration. In many cases, the
setup is standardized for an organization or project. In other cases, the setup can be
documented and emailed to an installer. The setup can also be performed on-site and
reflect “as-built” configurations.

The MD-xxHD meter cannot be configured using ViewPoint HD over a serial port. RS-485 serial
network configurations must be pre-configured or use Modbus/BACnet hosts.

This section describes the use of the ViewPoint HD Windows Application. If this interface
cannot be used, see the section on using the simplified MD-xxHD Web App interface. The web
browser can be accessed from the USB port to support Mac users.

Install the ViewPoint HD Software

Insert the ViewPoint HD thumb drive into the computer or download from:

https://www.dentinstruments.com/siemens

Locate the ViewPoint HD Installer and open this folder.

Typical Installation

Double-click the “RunMe to Install ViewPoint HD.bat” batch file to install ViewPoint and its support files
in Windows default location. This option works for most users.

17 Siemens Industry, Inc.

Custom Installation

For users who want to specify the location of the ViewPoint HD software and support files, double-click
the folder Install Files and run setup.exe. This will prompt the user for additional details.

Installation Trouble Shooting

Successful installation of ViewPoint HD may be prevented by settings specific to your PC for the following
reasons:

1) Anti-virus protection software may interfere with the installation of ViewPoint HD. If the installation
does not complete for this reason, try temporarily disabling the virus protection software on your
PC and re-attempt the installation.

2) Administrative Access. In some cases, user privilege settings may disallow the installation of new
applications. This may require logging in as an administrator.

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Connection and Configuration Options Using ViewPoint HD

When the ViewPoint HD application is launched, it will prompt the user to select one of four connectivity
options.

• Connect over USB cable

• Connect over Ethernet to a Predetermined IP address

• Scan Network

• Create Setup file only (no meter connected)

NOTE: The USB connection method is recommended for new users who have physical access to the meter

and a USB A to B cable (supplied). Check out this option first!

ViewPoint HD Connection Options

USB Connection (Power and Communications)

Connect the MD-xxHD meter to a USB port of your computer to provide both power and communications.

a. If equipped, the LCD display is the most visable indication of a running meter.
b. For meters without a display, a green flashing LED on the circuit board indicates that the MD-

xxHD meter has booted and is running.

c. The MD-xxHD meter draws 450 mA from the USB port which may overload “out of spec” USB

hosts. If the meter fails to power, or flickers when powering over USB, an alternate configuration
for power must be used.

19 Siemens Industry, Inc.

Preferred Connection via USB A to B Cable

d. Launch the ViewPoint HD application and press the CONNECT OVER USB button on the pop-up

window.

The meter should now be communicating. The ViewPoint HD application offers visual guides and context
help to facilitate meter configuration. Read the ViewPoint HD overview section (below) or watch the
tutorial videos for additional information on configuring the meter. By default, MD-xxHD meters are
configured for DNS Ethernet addressing. A very common configuration sequence is using USB to
configure a meter for Ethernet communications at a static IP address and then switching from USB over
to Ethernet to locate it. This is facilitated in ViewPoint HD by pressing the Refresh Connectivity icon
located in the upper right hand corner.

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Ethernet Network Connections

Configuring the MD-xxHD over Ethernet requires that the meter be powered using a second connection.
The MD-xxHD does not support Power Over Ethernet (POE). If the meter is already installed within the
building’s electrical network, closing the AC breaker (or approved disconnect) will turn on the meter
through the meter’s internal power supply. In the rare case that a computer’s USB port cannot provide
500 mA of current, an AC/USB charger or a USB battery can be used as a power source while using
Ethernet for communications.

Both the Network Scan and Connect Over Ethernet to IP options require that a valid network
connection exists between the MD-xxHD meter and configuration PC. This is a common startup
issue!

Dynamic Host Configuration Protocol (DHCP):

MD-xxHD meters are shipped in DHCP mode to prevent IP conflicts with other equipment. The meter is
expecting to receive an IP address from a DHCP service provided by a router, Layer 3 switch, or a server
providing DHCP service. Under this configuration, if the MD-xxHD meter and the host PC are requesting
an IP address from the same DHCP service provider, they will be able to communicate. Upon powering
up, the MD-xxHD meter will indicate the IP address on the LCD display (if equipped) or can be found
using the Network Scan function.

Direct

When a PC is directly connected to a MD-xxHD meter via an ethernet cable, no DHCP service exists.
This configuration can be made to work, but requires changes to either the meter communication settings
or the PC network configuration.

LCD Display

For units equipped with an LCD display navigate to:

Communications → Ethernet Settings → DHCP → OFF

Change the IP address in the meter to match the subnet of your PC’s IP address, making the meter IP
unique, or note the current address on the meter and prepare to configure your PC’s IP settings as shown
below:

21 Siemens Industry, Inc.

Once the PC and MD-xxHD are set to communicate on the same IP subnet:

1. Launch the ViewPoint HD application and enter the IP address of the meter (shown as the factory
default).

2. Press the Connect over Ethernet to: button on the pop up window.

3. The meter should now be communicating. ViewPoint HD is an intuitive application; read the
ViewPoint HD overview section (below) and/or watch the tutorial videos for additional information
on configuring the meter.

No LCD Display

A MD-xxHD meter without a display can only communicate directly with a PC over ethernet if the
IP address of the meter is set to static. Setting the IP address must be done ahead of time using
another interface (such as USB or serial).

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Network Scan

Network Scan is a feature for monitoring previously installed and configured MD-xxHD meters over an
Ethernet network. Network Scan will broadcast a UDP discovery packet on the same network as the PC
running the ViewPoint HD application. Normally this will be performed on a corporate network running
DHCP. Any MD-xxHD meter that responds will be displayed in a table that includes the system
description register, IP address, serial number, and communication configuration.

Highlight the desired meter and select OK, Test or Setup. Note that the effectiveness of this technique is
highly dependent on the configuration of the PC running ViewPoint HD (which may have more than one
network card) and the network configuration. Rescans can be used to make multiple attempts to locate a
particular meter on busy networks (UDP has no built-in retry provisions).

Launch Configurator

The final option in the ViewPoint HD Connect to Meter pop-up window is Launch Configurator. This
option allows for the creation of a meter setup or alarm table for future use without connecting to a meter.
After prompting the user for a meter model (shown below), ViewPoint HD launches under a mode with
restricted functionality. This mode operates on files only.

23 Siemens Industry, Inc.

ViewPoint HD Software Overview

ViewPoint HD is a Windows application and is the most versatile software tool for configuring and
verifying a MD-xxHD meter. All functions and menus are accessed under the central drop-down list which

has a content filter for viewing basic metering data or extended data that can be helpful in

troubleshooting. The information displayed in the drop-down list for each filter setting is summarized
below.

Display Data

Monitor

Power

Energy

Demand

Monitor

Power

Energy

Demand

Power Factor

Waveform Capture

Harmonics

Phasor Plot

Setup

Meter Setup

Communication Setup

Advanced

About the Meter

Setup

Meter Setup

Communication Setup

Alarms

Advanced

About the Meter

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ViewPoint HD Documentation

ViewPoint HD includes context help and other user-guiding features (shown below) to facilitate rapid and
accurate configuration.

Help Aids

Information

This button toggles the context pop-up window which
displays the technical and register description of any
screen object you hover over with the mouse.
Example shown for Frequency:

CT Type

Current Transformer models are selected in the
drop-down list and are identified by a combination of
CT image and amperage range. The parameters for
the selected CT are automatically populated. This
information can be edited for custom use.

Service Type

Select a service type from the drop-down list. A
selection populates the fields with pre-configured
service type information. User-selectable fields are
shown in white. Greyed out fields indicate restrictions
imposed by the meter.

Wiring Diagrams

Diagrams of different wiring configurations, such as
illustrated here, are available directly within the
software for quick reference.

25 Siemens Industry, Inc.

ViewPoint HD™ Documentation—Instructional Videos

Additional information about the capabilities of ViewPoint HD software is presented in short videos and can
be found at https://www.dentinstruments.com/resources/video and on the provided thumb drive:

.Video Topic

Files @
ThumbDrive\Manual\VIDEOS

Description

MD-xxHD Meter Setup

MD-xxHD Meter Setup \
MD-xxHD Meter Setup

8_18_2017.mp4

Identify the steps required for basic
configuration of the power meter
including selecting a voltage service and
CT types.

Waveforms & THD

MD-xxHD Waveform & THD
Example\

Waveform THD Demo.mp4

Discover how to use the power meter as
an oscilloscope to view electrical
waveforms and identify harmonic
distortion.

Phasor Plot

MD-xxHD Phasor Plot \
Phasor Plot Demo.mp4

Discover how to use the electrical phasor
plot to graphically confirm correct CT
placement and orientation.

Alarms Demo

MD-xxHD Alarms Demo \
Alarms-demo.mp4

Discover how to configure and manage
event alarms for conditions such as over
current or under voltage.

Setting up a PIN

MD-xxHD PIN Demo \
PIN Demo.mp4

Discover how to set up a security PIN to

protect information access to the meter’s

LCD display or web page.

Excel Register List Tips

Register List Demo \
Register List.mp4

Discover how to use filters in the MS
Excel Register document to quickly
locate registers or BACnet objects of
interest.

Siemens Industry, inc. 26

Configuring Electrical Components using ViewPoint HD

27 Siemens Industry, Inc.

Configuring Communications using Viewpoint HD

Navigate to Communication Setupunder the Display Menu List Box

RS-485

OR

ETHERNET

RS-485 Ethernet

Modbus

OR

BACnet

Modbus

OR

BACnet

Modbus BACnet Modbus BACnet

Set Serial Settings Set Serial Settings

Set Device ID

Set Max Masters

(optional)

Set Max Info Frames

(optional)

DHCP

OR

STATIC

Set Modbus Port

(optional)

Set Device ID

DHCP Static IP

Set Static IP Address

Set Subnet Mask

Set Gateway Mask

Press SEND SETUP TO METER

Set MS/TP Address

Set BACnet Port & BBMD

(optional)

Set Default Gateway

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Configuring Alarms in ViewPoint HD

The MD-xxHD power meter has the ability to set alarms for over and under conditions for voltage and
current on any meter channel.

Configuration Input Methods

ViewPoint HD uses dynamic entry for the specification of Alarm settings. Whichever text entry field is
selected becomes the forcing condition and the other related fields are updated by calculation to reflect a
consistent set of conditions. The text entry fields in grey are “configuration aids” and are NOT retained by
the meter. Only the fields with a black background are stored in the meters memory or in configuration
files.

Nominal Values

Entering alarm thresholds based on “percent of nominal” values is helpful when alarm conditions are
desired to be centered around electrical components or industry standard conditions. For example, an
over current alarm may be set to 80% of an installed circuit breaker to alert when that breaker exceeds
NEC recommendations.

Absolute Values

Entering alarms based on absolute value is a matter of entering the triggering values directly in the
register fields (black background).

29 Siemens Industry, Inc.

Setting the Real Time Clock

The MD-xxHD meter includes a Real Time Clock. The clock is used only to time stamp Interval Data in
the log, it is not used for calculation within the meter. For those customers using the IDR function of the
meter, it is helpful (but not strictly necessary) to set the real time clock so that data records can be
uniquely identified. The time can be set using ViewPoint HD, under the Advanced Tab, by clicking on the

small time icon in the bottom right corner of the clock.

The clock icon launches the Window Calendar and allows the user to enter any desired date and time.
Set Time to Now populates the current time. Press the OK button to commit this time to the RTC chip

onboard the meter.

Real Time Clock Power Source

The RTC integrated circuit is a stand alone low power circuit within the MD-xxHD meter. Time is kept in
the absence of a connected external power source (AC or USB power) by a super capacitor. The
capacitor can keep the RTC running over normal power outages (days to weeks) but is not expected to
keep time while the meter is being stored or shipped.

Users desiring to use the Interval Data Recording capability of the MD-xxHD meter will want to
have a procedure that ensures the Real Time Clock is set as part of the commissioning process.

Siemens Industry, inc. 30

Retrieving Interval Data

The MD-xxHD meter maintains an internal log of the energy data (Net kWh) for each channel in the
meter. This log is updated every 15 minutes and is always active. The meter stores 63 days’ worth of 15­minute data in its memory. This data can be retrieved by users looking to restore gaps in data collection
where RTUs may have been offline or communication has been interrupted. The Interval Data Recording
(IDR) is assessed through ViewPoint HD in the Advanced menu.

Click the Download button.

By default, the name of the data file will include the Serial Number of the Meter and the System
Description followed by – Datalog (see below).

After pressing OK the entire data path will be displayed.

The data log is a Comma Separated Values (CSV) file that can be opened in Excel or another program.
The data will be listed in Chronological Order according to an internal 32 bit sequence counter. The
sequence counter can be used to merge separate files together if necessary (example below).

Sequence

Number

Time Stamp

A1 kWh

A2 kWh

A3 kWh

A System

B1 kWh …

123456

5/15/2018 12:00

1.11E+5

2.22E+5

3.33E+5

6.66E+5

0

123457

5/15/2018 12:15

1.12E+5

2.23E+5

3.34E+5

6.69E+5

0

31 Siemens Industry, Inc.

MD-xxHD Web App Overview

The MD-xxHD power meter hosts a Web Application that can be accessed by any smart device running a
web browser. The MD-xxHD Web App can be accessed by using the USB or Ethernet port.

Macintosh users can configure the meter using the MD-xxHD Web App Interface by installing a
driver which is available from the Siemens web site at www.dentinstruments.com/siemens

Connect to Web App using USB

1. Connect your smart device to the meter

2. Open a Web Browser

3. Enter http://169.254.1.5 (this is the static address of the USB port)

Connect to Web App using Ethernet

1. Discover the IP address of the meter by one of the following methods (a-c):

a. Navigate to About Meter on the LCD menu.
b. Use a network discovery tool to find the address by connecting and disconnecting the

Ethernet cable.

c. Set the meter to a static address using the serial interface.

2. Connect your smart device to the same subnet as the MD-xxHD meter.

3. Open a Web Browser.

4. Enter the MD-xxHD’s Ethernet address into the web browser.

Authentication

Because the MD-xxHD Web App can be viewed and controlled by any smart device, and communicates
in parallel to the host system, the MD-xxHD can be configured to require a PIN# to restrict access the
meter.

Enter the PIN#, if assigned, or leave blank, if unassigned, and press the LOGIN button.

Organizationally, the MD-xxHD Web App works much the same as ViewPoint HD, although it has no
analytics and operates on a single element at a time.

Siemens Industry, inc. 32

MacOS Users

ViewPoint HD is a Windows application and does not run on MAC OS. MAC users can, however, make
use of the MD-xxHD Web App interface through the USB port by installing a CDC-EEM driver. This driver
is available in the Media Distribution materials or can be downloaded from the DENT Instruments web
site.

1. Users must have OS version of 10.11.1 or higher.

2. Drag the file dentinstruments-2.03a1.dmg onto the desktop.

3. Double-click the dmg file to initiate the MAC installer.

4. Follow the installation prompts.

5. Reboot the MAC after the installation process is complete.

6. Connect the MD-xxHD meter to the MAC with USB cable.

7. Open Safari browser and type IP address 169.254.1.5 to access the MD-xxHD Web App

8. If no login credentials are setup, click on LOGIN button with blank for password.

9. The MD-xxHD Web App checks for login credentials and, if passed, opens Real Time Web Page.

33 Siemens Industry, Inc.

Meter Installation - Details

This section is intended to support the physical installation of the meter and
provide guidance on connecting the current transformers (CTs) correctly within
the electrical load center and to the MD-xxHD meter.

Meter Mounting Configurations

Siemens MD-xxHD meters are sold in several form factors. Enclosures are designed to be wall mounted
and connected to electrical conduit. Plate mounted versions are ready to be mounted inside a customer
supplied NEMA enclosure.

Mounting Options

MD-48HD

MD-12HD

MD-xxHD Meter

with Enclosure

and Display

MD-48HD-C-D-N

MD-12HD-C-D-N

MD-xxHD Meter
with Enclosure,

NO Display

MD-48HD-C-N-N

MD-12HD-C-N-N

MD-xxHD Meter

with

Mounting Plate

and Display

MD-48HD-P-D-N

MD-12HD-P-D-N

Siemens Industry, inc. 34

Installation Sequence

The following section illustrates the MD-12HD model. The MD-48HD components are slightly different,
but follow the same procedure.

STEP 1. Remove top cover screws (4x) and high voltage cover screws (2x) – provided.

STEP 2. Locate, mark, and drill wall mounting points (2x–6x—customer supplied).

The plastic enclosure itself can be used as a template for marking the drill locations on the wall.

If the meter is not available for use as a drill template, a drawing indicating the spacing between mounting
holes can be found in the appendix. The centerline holes are intended for fastening to wall studs. If hollow
wall fasteners are used, the outer 4 mounting points are recommended.

#8 Fastener

35 Siemens Industry, Inc.

STEP 3. Mount conduit fittings, conduits, and blanking plugs.

STEP 4. Connect voltage leads

DO NOT ENERGIZE METER WITH VOLTAGE COVER REMOVED.

Siemens Industry, inc. 36

STEP 5. Attach high voltage cover.

STEP 6. Connect CT and Communications Wiring.

Connecting Voltage

Connect the voltage leads (L1, L2, L3, and N, as necessary) to the meter through a dedicated disconnect
or circuit breaker. A voltage lead of 14 AWG THHN Minimum 600VAC rating (or equivalent) is required.

IMPORTANT: Verify the circuit breaker is marked as the disconnect breaker for the meter.

IP30

TOUCH SAFE (with internal cover installed)

37 Siemens Industry, Inc.

Wiring the MD-xxHD Meter in a 3-wire, Split ɸ Service Panel

High voltage MAY BE PRESENT. Risk of electric shock. Life threatening voltages may be
present. Qualified personnel only.

Illustrating the Intended Wiring Configuration for Each of the Service Types

Available in the Service Drop-down List Under “Meter Setup”

EXAMPLE LOADS:
Single Phase L1-N or L2-N 110 VAC: Lighting, Appliance, Living Zone.

Single Phase L1–L2 220 VAC: Water Heater, Clothes Dryer, Equipment with no neutral wire.
Split Phase L1–L2 220 VAC: Service Entrance, Equipment with neutral wire.

3-Wire, 1 Phase used

On MAINS

L1-N, L2-N

(RōCoils Shown)

Single Phase

110 VAC Plug Loads

L1-N or L2-N

Single Phase

220 VAC Plug

Load

L1-L2

Meter is powered

from L1 to L2 on

the V Input 1

terminal

(Label as Disconnect)

Connect the

Neutral wire to

V INPUT 1 (N) on

the MD-xxHD

meter

3-Wire, 1 Phase

Split Load

L1-N, L2-N

Siemens Industry, inc. 38

Wiring the MD-xxHD Meter in a 4-wire, 3 ɸ Service Panel

Illustrating the Intended Wiring Configuration for Each of the Service Types

Available in the Service Drop-down List Under “Meter Setup”

NOTE: The MD-xxHD Meter Series uses the Neutral Terminal as a voltage reference. For

systems without a neutral conductor, Siemens suggests connecting a ground wire to
this terminal. If the neutral terminal is left open, L-L measurements will be accurate, but
L-N measurements may not be symmetric. If a ground wire is connected to the Neutral
terminal, <2 mA will flow into the ground wire.

Connect the
Neutral wire

or Ground wire to

V INPUT 1 (N) on

the MD-xxHD

meter

Meter Power

Connect all phases

to the V INPUT 1

terminal

(Label as Disconnect)

3-Wire, 3 ɸ

DELTA load

(No possibility of

Neutral Current)

L1-N, L2-N(est), L3-N

3 Wire, 3 ɸ used

On MAINS

L1-N, L2-N, L3-N

(RōCoils Shown)

Single Phase

Branch Loads

L1-N

4 Wire, 3 ɸ

WYE load

(Neutral Current)

L1-N, L2-N, L3-N

39 Siemens Industry, Inc.

Current Transformer Basics

Ensure CTs meet the following criteria:

▪ 600 Vac UL Rated
▪ UL2808 Listed
▪ 1/3 (333 mV) output voltage
▪ Appropriate range for the circuit (5-120% of CT rating recommended)
▪ Read the label.

Ensure CT orientation and placement:

▪ Arrow points toward load (or as instructed by CT label).
▪ Arrow points away from Panel (or as instructed by CT label).
▪ Placed on First Conductor of voltage Reference (L1-L2) circuits are

placed on L1.

▪ Observe wiring color and polarity.
▪ Use the Shield wire if provided (connect to PCB terminal marked S).

Wiring Guide for CT Types

Split, Hinged, and Solid

Core CTs

RōCoil CTs

White: Positive

Black: Negative

(no shield)

White: Positive

Brown: Negative

Bare Wire: Shield

Siemens Industry, inc. 40

Wiring the CTs to the MD-xxHD Meter

The image below is the counterpart to the service panel illustration and indicates how to connect CTs to
the MD-xxHD meter for each service type. For service types that are not specifically listed, it is
recommended to choose single phase service and configure each channel individually. Three phase
loads are illustrated on the left and split phase loads on the right as an example only. Elements are fully
interchangeable on the meter.

41 Siemens Industry, Inc.

Communication and Verification - Details

This section is intended to support the commissioning of the MD-xxHD meter by an
instrumentation technician. In many cases, the electrical installation is conducted
ahead of the availability of the RTU or was performed by a different installer. Often
the technician is working in concert with a remote programmer who is confirming the
connectivity with a remote host system. A Digital Multimeter (DMM) can be used to
confirm measurements at the board terminals, if necessary.

It is assumed that the meter is now powered up from the line
voltage. It is safe to touch the meter (including the user buttons)
with the top cover removed ONLY IF THE INTERNAL HIGH
VOLTAGE COVER IS INSTALLED.

Communications settings and real-time data values can be confirmed quickly using the LCD
interface if equipped. When significant setup modifications are anticipated, a computer interface
is recommended.

Physical Connections on an RS-485 Multidrop Network

The MD-xxHD meter uses a 2-Wire Half Duplex RS-485 Implementation.

▪ Termination Resistors—are NOT included on the MD-xxHD meter. If the MD-xxHD meter is at

the end of a daisy-chain, then connect a 120-ohm leaded resistor between the + and – terminal at
the connector.

▪ Bias Resistors—are NOT included on the MD-xxHD meter. Bias resistors are needed if the idle

conditions of the bus are in an indeterminant logic voltage. Bias resistors are usually located at
the master node and are usually 680 ohms for a RS-485 network.

▪ Network Topology—RS-485 is designed to be implemented as a daisy chain (series

connections) rather than star or cascade topologies.

▪ Signal Names—Some RS-485 devices use the terminology A/B while others use +/-. Note that A

is (-) and B is (+). Many manufacturers incorrectly label the terminals.

▪ Bus Loading—The MD-xxHD meter is a 1/8th unit load allowing up to 256 like devices in parallel.

2-Wire Multidrop Network using Terminating Resistors.

Siemens Industry, inc. 42

Communication Verification

Verification includes confirmation of BOTH the physical interface settings (Serial or Ethernet)
and the protocol (Modbus or BACnet) settings.

The LCD User Interface can be used to quickly confirm the settings required for each combination of
interface and protocol. The interface is intuitive and groups together commonly associated registers. The
complete interface is presented in Appendix A as a navigational map. Arrows indicate how to move from
one menu display to the next. A Reverse Contrast entry in the documentation indicates the active menu
item in a list which corresponds to a blinking character in the physical LCD. The ENTER button is used to
select a property and up/down buttons are used to select among the values supported by the meter. Note
that changes to the meter configuration are limited to the communication interface using the LCD. If
additional changes (such as CT type) are required, they must be made using a software interface.

Example LCD Navigation

43 Siemens Industry, Inc.

ViewPoint HD/MD-xxHD Web App

If your MD-xxHD model does not include the LCD User Interface, or if you prefer to verify the installation
using software, then verification is facilitated through the ViewPoint HD PC application or the MD-xxHD
Web App which shares a common design. See the section on Configuration Details for an overview and
list of instructional videos for ViewPoint HD or the MD-xxHD Web App.

Physical Interface Verification

Serial Setup Verification

In a multidrop serial network, the host data format settings are typically known or specified and the slave
is adjusted to match. In some cases (long wiring runs, etc.), it may be necessary to experiment in
determining the fastest allowable baud rate for a given wiring configuration by changing BOTH the host
and slave devices. Configurations other than 8N1 are rare and it is advised to use this configuration for
Data Bits, Parity, and Number of Stop bits, if possible.

LAN Ethernet Network Verification

The MD-xxHD meter communicates using IEEE 802.3 Ethernet connectivity running at a 10/100 Mbps.
Verification of the meter settings over Ethernet includes ensuring that the IP address of the meter is within
a range that allows communication with a host (if static) or is set for DHCP, allowing the meter to be
assigned an address by a DHCP server as described below.

DHCP

If the MD-xxHD meter is configured for DHCP when the meter is powered on, or the Ethernet cable is
inserted, the meter is assigned an IP address by the DHCP server. This address appears on the meter
LCD or can be found through connection with ViewPoint HD or the MD-xxHD Web App. The IP address
assigned to the meter should be regarded as a temporary address as the address may change between
power cycles making it difficult for the host system to know how to find the meter on the network. One
common approach is to set the MD-xxHD for DHCP so that the address can be assigned by a DHCP
server and then change that IP address to static once the connection is made. MD-xxHD meters are set
to use DHCP as a default setting to facilitate this approach.

Static IP

If the MD-xxHD meter is set to a static IP then its address should be assigned by an IT department to
avoid multiple devices on the same network. This scheme is usually used when an RTU is expecting to
find the meter at a specific IP address.

Siemens Industry, inc. 44

Protocol Verification

The network protocol is typically specified as part of the installation. BACnet MS/TP and Modbus RTU
are the two communication protocols that operate over an RS-485 serial network and BACnet IP and
Modbus TCP are the protocols over Ethernet. Each combination of interface and protocol require specific
registers settings described below. The scope of this section is to use either the LCD interface or
software tools to quickly confirm or change settings to match an existing specification. Further
information and optimization tips are covered in the section on RTU programming.

Modbus Settings

Modbus RTU Settings

Device Address: In a Modbus network each device must be assigned a unique slave address. Valid

Modbus addresses are 1-240 (keeping in mind the MD-48HD requires 15 addresses beyond Element A
or the MD-12HD requires 4 address beyond Element A). The slave address of the power meter sets the
register address for ELEMENT A. Adjacent elements B, C, D, etc. are accessed by incrementing the
slave address by 1. The slave address of the MD-xxHD meter needs to be set to match the address
expected by the RTU and is normally part of the network specification. The default address for element A
is 1.

Modbus TCP Settings

Modbus Port: The MD-xxHD meter uses the industry standard Port 502 for Modbus. This port number can
be changed.

BACnet Settings

BACnet Device ID: In a BACnet network, each device must be assigned a unique Device ID and is
common to BACnet MS/TP and BACnet IP protocols. Besides the standard ability to change this from

a BACnet explorer tool it may be changed via ViewPoint HD, MD-xxHD Web App, or LCD.

BACnet MSTP

Device Address: MD-xxHD meters are Master devices and as such must use MS/TP addresses in the
range from 0-127. This address must be unique on the network.

Max Masters: The default setting is 127 and does not usually need to be changed.
Max Info Frame: The default setting is 1 and does not usually need to be changed.

BACnet IP

BACnet Port: The BACnet default port is 47808 and does not usually need to be changed.
BBMD: The BACnet/IP Broadcast Management Device is set to 0.0.0.0 at default and can be changed

through a software tool to allow discovery across networks.

45 Siemens Industry, Inc.

Pulse Inputs

MD-12HD meters are equipped with 4 pulse inputs and MD-48HD meters (hardware version I) are
equipped with two pulse inputs. Pulse counting supports accumulation of consumption data from any
external meter using a dry contact (Form A Relay) or open collector outputs. The MD-xxHD pulse inputs

are compatible with “low speed” meters. The pulse duration must exceed 50mS in both the logic low and

high state allowing for a maximum input frequency of 10 Hz.

Pulse scaling, resetting and accumulated values are accessed through registers and are “system” in
scope. See the register list, ViewPoint HD, or videos for more information.

ALARM (SPDT)

The MD-xxHD meter supports user-configurable alarms for over-current, under-current, over-voltage, and
under-voltage. ViewPoint HD helps users set these values by allowing for values to be entered using
direct entry mode or specifying the limits as a percentage of nominal.

Alarm persistence settings are used to allow for temporary conditions, such as a motor starting, that are
beyond trigger limits. For example, in the case of meter upset from ESD events, short persistence
settings may lead to false alarm triggers. When any alarm condition has been satisfied throughout the
persistence interval, the MD-xxHD trips the MASTER ALARM relay, which is an electromechanical relay
on the PCB.

Once tripped, the relay can only be reset by clearing the alarm through Modbus register/BACnet object
2451”

The Master Alarm relay can be hard wired to an interrupt or polling circuit in a host system allowing for a
more rapid response than the data polling frequency, if desired. The status of each alarm is determined
by reading status registers. See the register list, ViewPoint HD, or instructional videos for more
information.

>50 mec

>50 mec

Note: The Master Alarm relay is intended for low voltage DC connections.
The user must protect the switch from over-current conditions when closed.

Siemens Industry, inc. 46

12 Volt Auxiliary Power

The MD-xxHD meter provides an auxiliary 12 volt output that is derived from an auxiliary winding on the
MD-xxHD’s line-connected power supply. The 12 volt supply voltage is unregulated but protected by a
self-resetting fuse. The purpose of the supply is to power external radio equipment or provide supply
voltage for analog sensors, such as 4 to 20 mA current loop devices. If full-rated current is drawn from
this terminal, the minimum operating voltage of the L1-L2 power supply is 100 Vac.

Access Restriction Limitations

If security levels have been set up in the meter, no data is accessible through the LCD user interface or
MD-xxHD Web App without entering the PIN credentials. Note, however, that protocols such as Modbus
do NOT SUPPORT ANY LEVEL OF security such that any network traffic acting as a master can retrieve
and write data from the registers. Generally, this will require knowledge of the IP address or slave ID and
the register list which discourages casual intrusion.

Security PIN Protection

MD-xxHD meters have two levels of PIN protection that users can choose to assign for restricting access
to meter information. The PIN logic is described in the figure below. The default user entry (on power up
or time-out) is 0000 which satisfies both the Read Only and the Read/Write default register settings.

Using the Permission Registers

The MD-xxHD meter uses both a “Read Only” register and a “Read/Write” register to compare against
user entrees from the LCD keypad or MD-xxHD Web App form entry. Both internal permission registers
have a default value of [0000]. A consequence of this is that both PIN registers need to be configured (i.e.
changed from defaults) to implement a read only PIN, otherwise the situation may occur where a user

47 Siemens Industry, Inc.

intends to restrict access to “Read Only” by setting only this PIN unaware of the fact that the default PIN
still matches the criteria for “Read/Write” which will accidentaly promote the user. ViewPoint HD and the
MD-xxHD Web App disallow this condition, but remote programmers using direct register access may
create this condition.

Read Only Permission Register

Configuring the meter for a Read Only user allows data or configuration items to be viewed, but not
changed. This level of authorization might be appropriate for general end-users such as building owners
who may not be aware of the details of the installation. It is recommended to use ViewPoint HD to
configure permissions, although it is also possible to set up a Read Only PIN using the MD-xxHD Web
App if a Read/ Write PIN has already been entered (either through the LCD or the Web App itself).

Read/Write Permission Register

Read/Write permissions allow users to read and write configuration items and to reset the PINs. This level
of authorization will be required by any technician or user who needs the ability to correct setup errors in
the meter. The default PINs [0000] allow new users to reset the Read/Write PIN from either the MD-xxHD
Web App or ViewPoint HD. Permissions cannot be set through the LCD interface.

Reading PINs over Modus

ViewPoint HD can be used to directly report the Read Only and Read/Write PINS under the Advanced
Tab (passwords). The value reported by ViewPoint HD is the value as entered in the web page or LCD
interface.

PINs are also accessible as registers, but are encoded so that reading the value of the register through
an RTU does not inform a user what the password is. This feature allows Siemens to support looking up
forgotten PINs, if network access is available.

ViewPoint HD – Unrestricted Access

The ViewPoint HD software tool can be used to read & write configuration information to the meter
without entering credentials.

ViewPoint HD is the preferred tool for setting up access restrictions because it allows users to
test the function of the PINs without locking themselves out from the ability to change the PIN, a
frustrating catch 22!

Siemens Industry, inc. 48

Verification of Installation

Once the MD-xxHD meter is configured and communicating with the RTU, it is a good idea to perform
some simple checks to ensure that all the CTs are on the correct voltage phases and that the CTs are
facing the correct direction. The following are recommendations that work for typical installations. Special
circuit conditions, like unloaded motors, may indicate an installation error when none exists. A Digital
Multimeter (DMM) can be used to confirm these cases.

Installation Phase Verification

The MD-xxHD meter includes a PhaseChek™ algorithm that identifies any element that the meter
suspects may be incorrectly phased (i.e., the CT is associated with the wrong voltage source or is
physically on the wrong wire) based on power factors below 0.55. This feature is accessed using the LCD
interface by navigating to VERIFY INSTALLATION and pressing the ENTER button. The LCD display will
list the elements having at least one channel with a low power factor.

CHECK ELEMENTS

A EF

Use the navigation buttons to highlight a specific element and press ENTER or just press ENTER and
move from element to element using the  / → keys. Within each element (identified on the top line of
the display) the status of each channel is identified as good (PF > 0.55) or bad (PF < 0.55).

ELEMENT F

CH1 Good

CH2 Bad

CH3 Bad

Two “Bad” channels are often an indication that two CTs are inadvertently swapped. When the power
factor for all enabled channels is greater than 0.55, the meter reports:

CHECK ELEMENTS

ALL CHANNELS GOOD

PhaseChek™ is only applied for elements that are enabled. VIEW METER SETUP on the LCD
screen can be used to ensure that all intended elements are active. PhaseChek™ is advisory
only. It is possible that the power factor for a particular load is truly less than 0.55, as may be
observed in a free running motor.

The ViewPoint HD and the MD-xxHD Web App run PhaseChek™ continuously on all enabled elements
and report low power factor in the real time values table by turning the text RED or by a using a red
indicator.

49 Siemens Industry, Inc.

Phase Checking By Phasor Plot

When a CT is installed on the incorrect phase, the indicated current vector is pointing either 180 degrees
away (a split phase system) or 120 degrees away (a three-phase system) from the true displacement
angle. In the latter case, this usually causes a significant decrease in the reported power factor, even if
the CT is also on backwards. When the absolute displacement power factor of a load is below 0.55 (an
angle greater than 57 degrees between voltage and current), the MD-xxHD meter will flag it as a phasing
error. ViewPoint HD has a PhasorPlot feature that can be used to study the voltage and current vectors of
a given meter element.

Check for Low Power Factor

ViewPoint HD: Real Time Values > (All power factors < 0.55 are shown in RED)
MD-xxHD Web App: Real Time Values > (All power factors < 0.55 are shown in RED)
LCD: Verify Installation > (LCD will list all elements having a PF < 0.55)

Electrical Power Quadrants with Incorrect CT Phase shown

Siemens Industry, inc. 50

CT Orientation Check

The MD-xxHD meter reports power and energy in each electrical quadrant under a different register.
When CTs are installed backwards, the indicated current vector is oriented 180 degrees away from the
true displacement angle. In accordance with standard definitions, the Wattage and VARs of the effected
channel report with a sign opposite from what is expected. Often this means that the import registers will
be reading zero while the export registers are showing a value. Note that backward CTs have no impact
on the amplitude of the Power Factor. A moderate power factor (>0.7) in concert with a negative power is
a clue that the CT is on backwards, but is on the correct phase.

Electrical Power Quadrants with Reversed CT Shown

Check that the wattage has the correct sign (Designated + for loads)

▪ ViewPoint HD: Real Time Values > (Confirm Sign of Power For All Elements)
▪ MD-xxHD Web App: Real Time Values > (Confirm Sign of Power For All Elements)
▪ LCD: Real Time Values > (Confirm Sign of Power for Each Element)

If a CT is discovered to be on backwards after the installation is complete, the direction of the
CT can be reversed through a user configuration register designed for this purpose, called the
“Flipper,” located at 2226, 2234, and 2235 or use ViewPoint HD’s meter setup.

51 Siemens Industry, Inc.

Power Factor Convention

Power Factor is the ratio of a signed number (true power) and an unsigned number (apparent power).
This discrepancy has led to some customer confusion. The MD-xxHD meter allows users to select
between two conventions (ANSI and IEEE). In the IEEE convention the sign of PF follows the sign of

power itself. In the ANSI convention a “+” PF indicates a lagging current (inductive load) while a “–“ PF

indicates a leading current (capacitive load). The sign relationships are shown below for these
conventions in each electrical quadrant.

Total Harmonic Distortion

The MD-xxHD meter reports overall harmonic content in power (% THD) based on its measurement of
Power, Var and Apparent Power as illustrated in the figure below. This method cannot indicate the
harmonic number or distribution but provides the overall harmonic content.

In many circumstances users are interested in the harmonic content of current. In cases where the
voltage is very sinusoidial the THD measurement is a good estimate of both power and current.
However, if the voltage waveform is distorted the reported THD in power can be misleading. ViewPoint
HD can provide additional analysis of harmonic content in voltage and current by sampling the MD-xxHD
raw data and performing digital signal processing on the signal. Using this method the individual
harmonics levels can be observed. The results are presented in graphical form.

Siemens Industry, inc. 52

Pre-Processing Aids

The MD-xxHD has several registers that can aid in pre-processing or post-processing data that otherwise
may need seconday operations.

Snap Thresholds

The signal to noise ratio of the MD-xxHD is above 80 db at full scale (1 part in 10,000). When the signal
amplitude becomes so small that it is indistinguishable from noise it is often better to record 0 than a
small random value. Snap Threshold registers (Advanced tab in ViewPoint HD) tell the meter when to
record 0 instead of the measurement result. The factory defaults for CTs are expressed in percent and
have a default value of 0.04% Full Scale. The voltage thresholds are in absolute value, the recommended
minimum voltage is 1.0 volt

Multipliers

The MD-xxHD has registers that allow potential transformers and series current transformers to be used
with the MD-xxHD meter. These registers allow for transformer winding ratios or other scaling
adjustments to be included in the meter processing to eliminate post process scaling. Adjustments for
voltage are global to the meter while CTs can be adjusted on a channel by channel basis. The multiplier
is a floating-point number and can also be used for post installation calibration if desired. Default values
are 1.0.

CT Phase Shifts

Current transformers like all other transformers experience a small magnetizing current that is out of
phase with the measurement current. Phase shift registers are available on a per channel basis and
allow corrections of +/- 3 degrees. Viewpoint HD loads the default phase shift for the CT types available in
the picker list. If no phase shift information is available, enter the accuracy class in degrees (for example,
1% = 1.0 degree).

Demand

MD-xxHD meters keep track of electrical demand using a 15-minute sliding window. The Peak Demand
and Present Demand registers contain the highest average power consumption in any 15-minute interval
and the average power consumption in the last 15-minute interval respectively. The Clear Peak Demand
register is used to reset the peak demand detector.

53 Siemens Industry, Inc.

RTU Programming and Scripting - Details

This section is intended for the programmer of the RTU or host system and includes
details about meter and element addressing, register locations, data formats and
protocol examples.

Register Organization

The MD-xxHD meter communicates through the reading and writing of registers. Registers are organized
into functional groups and are compliant with the SunSpec Modbus interface model.

▪ SunSpec Common Registers
▪ SunSpec TCP Network Stack Registers
▪ SunSpec Serial Interface Registers
▪ SunSpec Energy Meter
▪ DENT Factory Registers
▪ DENT User Command Registers
▪ DENT User Configuration Registers
▪ DENT Metrology Registers
▪ DENT Waveform Capture Registers

The complete register set is included as an Excel file on the supplied thumb drive or at:

https://www.dentinstruments.com/siemens

Element vs. System Scope

Element

The term “element” is used in two contexts. Physically, the term Element is used to describe
groups of three channel sections identified by alphabetic letter on the silk screen of the PCBA
(such as A,B,C,D). In a three-phase power system these correspond to electric circuits.
Logically the term Element describes the scope of a data item, register or point (Modbus
register or BACnet object). Each Element based point is accessed by choosing the appropriate
Modbus address, BACnet object range, or BACnet structured view. Elements in turn have points
that refer to individual channels or to SUMS or AVERAGES of those channels. Registers that
contain data inclusive of more than one channel are identified as being either SUMS or
AVERAGES of the enabled channels within an element. In a BACnet structured view an
Element represents a level of organization for related points.

Channel

Channels are identified on the circuit board as CH1, CH2, or CH3 and represent physical CT inputs. In
three phase system configurations, these correspond to a current load on a corresponding line voltage. In
single phase configurations, they are just used to identify a CT location. Registers providing data for an
individual channel are also described as elements in their scope as a unique value exists for each Slave
Address or BACnet object instance.

Siemens Industry, inc. 54

System

The term “System” refers to registers defining the characteristics of the entire circuit board. System
registers report the same value independent of the slave address. Under BACnet structured view the
system points are grouped together.

Configuring Element and Channel Register for Service Types

The ViewPoint HD software enforces all element configurations to form a valid electrical system.
Configurations performed by remote systems may produce unexpected results if configurations are
internally inconsistent. The following tables document how to configure element and channel registers for
each service type. Every register should be explicitly written.

Red Text indicates Required Values, Purple Text indicates Suggested Defaults, if this data is not known.

Modbus Absolute Address/BACnet Object Assignments for Setting up Service Types

REGISTER

TEMPLATE

Service Type

2207

V_Input

2217

Description

2617

Channels

Volt Ref

CT Type

Range

Phase Shift

CT Multiplier

CT Sign

CH1

2220

2223

2224,2225

2224,2225

2221,2222

2226

CH2

2229

2232

2227,2228

2233,2234

2230,2231

2235

CH3

2238

2241

2236,2237

2242,2243

2239,2240

2244

Configurations

4 Wire 3 ɸ

(Wye)

Service Type

1

V_Input

1 or 2

Description

31 Char

Channels

Volt Ref

CT Type

Range

Phase

Shift

CT Multiplier

CT Sign

CH1

L1 – N [1]

mV [1] or RōCoil [2]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

CH2

L2 – N [2]

mV [1] or RōCoil [2]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

CH3

L3 – N [3]

mV [1] or RōCoil [2]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

55 Siemens Industry, Inc.

3 Wire 3 ɸ

(Delta)

Service Type

2

V_Input

1 or 2

Description

31 Char

Channels

Volt Ref

CT Type

Range

Phase Shift

CT

Multiplier

CT Sign

CH1

L1 – N [1]

mV [1] or RōCoil [2]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

CH2

L2 – N [2]

mV [1] or RōCoil [2]

Same as 1

Same as 1

Same as 1

0 or 1

CH3

L3 – N [3]

mV [1] or RōCoil [2]

Same as 1

Same as 1

Same as 1

0 or 1

Even though CH2 is calculated internally, it is recommended that the CT settings reflect those from CH1, rather than being left at
factory default, to facilitate configuration validation from the RTU.

2 Wire 1ɸ

(Plug

Load)

Service Type

3

V_Input

1 or 2

Description

31 Char

Channels

Volt Ref

CT Type

Range

Phase

Shift

CT

Multiplier

CT Sign

CH1

ANY [1-6]

mV [1] or RōCoil [2]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

CH2

ANY [1-6]

mV [1] or RōCoil [2]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

CH3

ANY [1-6]

mV [1] or RōCoil [2]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

Any channel that needs to be turned OFF should set the CT Type to OFF.

3 Wire 1 ɸ

(Split

Phase)

Service Type

4

V_Input

1 or 2

Description

31 Char

Channels

Volt Ref

CT Type

Range

Phase

Shift

CT Multiplier

CT Sign

CH1

L1 – N [1]

mV [1] or RōCoil

[2]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

CH2

L2 – N [2]

mV [1] or RōCoil [2]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

CH3

L3 – N [3]

OFF [0]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

Even though CH3 is not used for computation it is recommended that the CT settings reflect those from CH1 rather than being left at
factory default to facilitate configuration validation from the RTU.

Disabled

(OFF)

Service Type

5

V_Input

1 or 2

Description

31 Char

Channels

Volt Ref

CT Type

Range

Phase

Shift

CT Multiplier

CT

Sign

CH1

L1 – N [1]

OFF [0]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

CH2

L2 – N [2]

OFF [0]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

CH3

L3 – N [3]

OFF [0]

Any > 0A

-3.0˚ to +3.0˚

Any > 0 [1]

0 or 1

Even though disabled channels are not used in calculations and report 0.0 they still contain configuration information. It is suggested
that they be set to a known value rather than left at defaults to facilitate configuration validation by the RTU.

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Configuring System Registers

Modbus Absolute Address/BACnet Object Assignment

REGISTER TEMPLATE

Description

2601

PF Sign Convention

2248

V1 Multiplier

2203,2204

V2 Multiplier

2205,2206

Configurations

System

Description

31 Char

PF Sign Convention

ANSI [1] or IEEE[2]

V1 Multiplier

Any > 0 [1]

V2 Multiplier

Any > 0 [1]

Modbus Protocol Commands

If configured for Modbus, the MD-xxHD networked power meter family follows the Modbus RTU protocol
and supports the following command set.

Supported Modbus Commands

Command Name

Command Number

(Hex)

Description

Read Holding Registers

03

Used to read the data values from the MD-xxHD meter

Write Single Register

06

Used to write a single holding register to a MD-xxHD meter

Write Multiple Registers

16 (0x10)

Used to write multiple registers (useful but not required for
32-bit values and strings)

Report Slave ID

17 (0x11)

Used to read information from the identified MD-xxHD meter

Slave Address

For Modbus/TCP the base slave address (or “unit address” as the Modbus TCP spec. calls it) is fixed at 1.
See the section “Serial Protocols” for additional information on setting the Slave Address and finding the

address of a specific meter element.

Modbus String Entry

Registers that are identified as “strings” are handled uniquely by the MD-xxHD power meter. Each
register in the string block must be written to sequentially without interruption either by using a write
multiple command or by sending single register commands back to back. The final character in the string
MUST be a NUL character (ASCII 0). The meter will process the entire string only if these two conditions
are met, otherwise the data is ignored. This special processing has been implemented to protect partial
updates for network settings.

57 Siemens Industry, Inc.

String example 1: Change a Static IP Address

Change the IP address of a meter from 192.168.2.8 to 192.168.2.9

It may be tempting to update only the digit “8” to “9” in the IP address, but this will NOT perform as expected.

Internally, the meter uses a single string buffer for all string register operations and unspecified entrees will
continue to contain the previous buffer contents unless specifically written to. Write every register from the
beginning of the block to the end.

Reg (dec)

1079

1080

1081

1082

1083

1084

1085

1086

Reg (hex)

04 37

04 38

04 39

04 3A

04 3B

04 3C

04 3D

04 3E

Value (Chr)

‘1’ ‘9’

‘2’ ‘.’

‘1’ ‘6’

‘8’ ‘.’

‘2’ ‘.’

‘9’ NUL

NUL NUL

NUL NUL

Value (hex)

31 39

32 2E

31 36

38 2E

32 2E

39 00

00 00

00 00

START

STOP

Specific Implementation Examples – Element A set to ID 1

Note that in Modbus the CRC communicated is LSB then MSB.

VIA MODBUS RTU (SERIAL) USING FUNCTION CODE 6 / WRITE SINGLE REGISTER

ID FC ADDR DATA CRC

01 06 04 37 31 39 EC B6
01 06 04 38 32 2E 9C 4B

01 06 04 39 31 36 CD 71

01 06 04 3A 38 2E 3B 2B

01 06 04 3B 32 2E 6C 4B

01 06 04 3C 39 00 5A A6

01 06 04 3D 00 00 19 36

01 06 04 3E 00 00 E9 36

VIA MODBUS RTU (SERIAL) USING FUNCTION CODE 16 / WRITE MULTIPLE REGISTER

ID FC ADDR #REGS LN DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 CRC

01 10 04 37 00 08 10 31 39 32 2E 31 36 38 2E 32 2E 39 00 00 00 00 00 9B 99

VIA MODBUS TCP (ETHERNET) USING FUNCTION CODE 6 / WRITE SINGLE REGISTER

TXNID PROID LENGT ID FC ADDR DATA (TXNID will be arbitrary)

01 87 00 00 00 06 01 06 04 37 31 39

01 88 00 00 00 06 01 06 04 38 32 2E

01 89 00 00 00 06 01 06 04 39 31 36

01 8A 00 00 00 06 01 06 04 3A 38 2E

01 8B 00 00 00 06 01 06 04 3B 32 2E

01 8C 00 00 00 06 01 06 04 3C 39 00

01 8D 00 00 00 06 01 06 04 3D 00 00

01 8E 00 00 00 06 01 06 04 3E 00 00

VIA MODBUS TCP (ETHERNET) USING FUNCTION CODE 16 / WRITE MULTIPLE REGISTER

TXNID PROID LENGT ID FC ADDR #REGS LN DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7

01 87 00 00 00 17 01 10 04 37 00 08 10 31 39 32 2E 31 36 38 2E 32 2E 39 00 00 00 00 00

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String example 2: Element Description
Change the Element Description from Mains Bld 100 to Mains Bld 101

It may be tempting to update only the character number “0” to “1” in the description, but this will NOT perform

as expected. Internally, the meter uses a single string buffer for all string register blocks and unspecified
entrees will continue to contain the previous buffer contents unless specifically written to.

Reg (dec)

2617

2618

2619

2620

2621

2622

2623

2624

2625

2626

2627

2628

2629

2630

2631

2632

Reg (hex)

0A
39

0A
3A

0A
3B

0A
3C

0A
3D

0A
3E

0A
3F

0A
40

0A
41

0A
42

0A
43

0A
44

0A
45

0A
46

0A
47

0A
48

Value
(Chr)

‘M’ ‘a’

‘i’ ‘n’

‘s’ ‘ ‘

‘B’ ‘l’

‘d’ ‘ ‘

‘1’ ‘0’

‘1’

Nul

NulNul NulNul NulNul NulNul NulNul NulNul NulNul NulNul NulNu

l

Value
(hex)

4D
61

69
6E

73
20

62
6C

64
20

31
30

31
20

00
00

00
00

00
00

00
00

00
00

00
00

00
00

00
00

00
00

START STOP

Specific Implementation Examples – Element A set to ID 1

VIA MODBUS RTU (SERIAL) USING FUNCTION CODE 6 / WRITE SINGLE REGISTER

ID FC ADDR DATA CRC

01 06 0A 39 4D 61 AE A7

01 06 0A 3A 69 6E 05 A3

01 06 0A 3B 73 20 DF 37

01 06 0A 3C 62 6C 63 53

01 06 0A 3D 64 20 30 C6

01 06 0A 3E 31 30 FE 5A

01 06 0A 3F 31 20 AE 56

01 06 0A 40 00 00 8B C6

01 06 0A 41 00 00 DA 06

01 06 0A 42 00 00 2A 06

01 06 0A 43 00 00 7B C6

01 06 0A 44 00 00 CA 07

01 06 0A 45 00 00 9B C7

01 06 0A 46 00 00 6B C7

01 06 0A 47 00 00 3A 07

01 06 0A 48 00 00 0A 04

VIA MODBUS RTU (SERIAL) USING FUNCTION CODE 16 / WRITE MULTIPLE REGISTER

ID FC ADDR #REGS LN DAT00 DAT01 DAT02 DAT03 DAT04 DAT05 DAT06 DAT07

01 10 0A 39 00 10 20 4D 61 69 6E 73 20 62 6C 64 20 31 30 31 20 00 00

DAT08 DAT09 DAT10 DAT11 DAT12 DAT13 DAT14 DAT15 CRC

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3A 18

59 Siemens Industry, Inc.

VIA MODBUS TCP (ETHERNET) USING FUNCTION CODE 6 / WRITE SINGLE REGISTER

TXNID PROID LENGT ID FC ADDR DATA (TXNID will be arbitrary)

01 87 00 00 00 06 01 06 0A 39 4D 61

01 88 00 00 00 06 01 06 0A 3A 69 6E

01 89 00 00 00 06 01 06 0A 3B 73 20

01 8A 00 00 00 06 01 06 0A 3C 62 6C

01 8B 00 00 00 06 01 06 0A 3D 64 20

01 8C 00 00 00 06 01 06 0A 3E 31 30

01 8D 00 00 00 06 01 06 0A 3F 31 20

01 8E 00 00 00 06 01 06 0A 40 00 00

01 8F 00 00 00 06 01 06 0A 41 00 00

01 90 00 00 00 06 01 06 0A 42 00 00

01 91 00 00 00 06 01 06 0A 43 00 00

01 92 00 00 00 06 01 06 0A 44 00 00

01 93 00 00 00 06 01 06 0A 45 00 00

01 94 00 00 00 06 01 06 0A 46 00 00

01 95 00 00 00 06 01 06 0A 47 00 00

01 96 00 00 00 06 01 06 0A 48 00 00

VIA MODBUS TCP (ETHERNET) USING FUNCTION CODE 16 / WRITE MULTIPLE REGISTER

TXNID PROID LENGT ID FC ADDR #REGS LN DAT00 DAT01 DAT02 DAT03 DAT04 DAT05

01 87 00 00 00 27 01 10 04 37 00 10 20 4D 61 69 6E 73 20 62 6C 64 20 31 30

DAT06 DAT07 DAT08 DAT09 DAT10 DAT11 DAT12 DAT13 DAT14 DAT15

31 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

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Floating Point Registry Entry

The MD-xxHD meter uses 32-bit IEEE 754 formatted floating point numbers
for reporting results and storing scalable user register values such as CT
range, CT and PT scaling factors, etc. Because these registers require two
16-bit Modbus addresses to convey, these registers must be accessed as
multiple registers or accessed sequentially without interruption. The reason
for preventing floating point registers from being updated as single 16-bit
registers is that interim values (when the number is half entered) represent
valid but unknown numeric values! Requiring both the MSW and LSW
registers to be written sequentially prevents meter data from having unknown
and potentially very large scaling factors applied to measurement data
between register writes!

SELECTING THE DATA TYPE

It is likely that the RTU program has built-in support for multiple data types
including floating point. The MD-xxHD meter data is stored as MSW, LSW
which may take some trial and error to identify in the RTU setup. Float ABCD
is an example of the how this RTU identifies the matching byte order.

It is anticipated that command-line programmers or script writers may prefer to enter data in
hexadecimal format. Non-programmers using Modbus or BACnet utilities (or those using
ViewPoint HD) may prefer to use decimal notation. This example works through the details of
converting information found in our user documentation (decimal) into a hexadecimal format
which should cover the highest level of complexity.

Entering Floating Point Data Using a Script

Consider the process of setting the CH1 CT Full Scale Rating to a value of 100.00 amps for a meter having
an element at slave address #1.

Step 1. Convert 100.00 into an IEEE 754 floating point format by entering the number in a conversion
utility.

a. Internet Utility. Example: https://www.h-schmidt.net/FloatConverter/IEEE754.html
b. ViewPoint HD

a) Internet Utility

The 16-bit floating point representation of 100.00 is shown below as 0x42C8 0x0000. These are
the required MSW and LSW register contents respectively.

61 Siemens Industry, Inc.

b) ViewPoint HD.

If an internet utility is not available, ViewPoint HD has a built-in conversion utility under the
Advanced Tab. Enter 100.00 and press the Convert to Modbus Integers button.

This utility identifies that the MSW and LSW registers need to be set to 17096 & 0 (decimal)
respectively. If hexadecimal notation is required these decimal values can be converted using a
utility such as the MS Windows Calculator (under Programmer mode) as shown below.

After padding, we also arrive at 0x42C8 0x0000 as the MSW and LSW register values respectively.
Step 2. Identify which configuration registers control the CH1 CT Full Scale Rating

a. Refer to the MS Excel Register List (USB drive or at www.DENTinstruments.com)
b. Use ViewPoint HD to discover the address of displayed data.

a) Open the MS Excel Register List and locate the CH1 CT Full Scale Rating Registers under USER

CONFIG POINTS group.

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b) Connect to a MD-xxHD meter using ViewPoint HD. Navigate to the Meter Setup tab and press

the ? icon. Hover over the Element A setup portion of the window. This launches the data
exploring tool and indicates the addresses of the registers controlled or displayed by this window.

The desired control registers are 2218 (MSW) and 2219 (LSW)
Convert the register addresses of interest into hexadecimal notation (if required).

STEP 3) Calculate the CRC-16 (Modbus RTU) for the expression. There are several variations of the
CRC016; ensure the one you are using is for Modbus. The CRC is entered LSB first.

Enter the Entire Expression into a CRC Calculator (a web utility can be helpful)

63 Siemens Industry, Inc.

Step 4) Putting it all together

VIA MODBUS RTU (SERIAL) USING FUNCTION CODE 6 / WRITE SINGLE REGISTER

ID FC ADDR DATA CRC (note CRC order is swapped)

01 06 08 AA 42 C8 9A BC

01 06 08 AB 00 00 FA 4A

VIA MODBUS RTU (SERIAL) USING FUNCTION CODE 16 / WRITE MULTIPLE REGISTER

ID FC ADDR #REGS LN DATA0 DATA CRC

01 10 08 AA 00 02 04 42 C8 00 00 8B EE

VIA MODBUS TCP (ETHERNET) USING FUNCTION CODE 6 / WRITE SINGLE REGISTER

TXNID PROID LENGT ID FC ADDR DATA (TXNID will be arbitrary)

01 87 00 00 00 06 01 06 08 AA 42 C8

01 88 00 00 00 06 01 06 08 AB 00 00

VIA MODBUS TCP (ETHERNET) USING FUNCTION CODE 16 / WRITE MULTIPLE REGISTER

TXNID PROID LENGT ID FC ADDR #REGS LN DATA0 DATA1

01 87 00 00 00 0B 01 10 08 AA 00 02 04 42 C8 00 00

Commands Requiring a Processor Reset

Register manipulation of communication protocols or addressing require that the MD-xxHD perform a
“soft reset” in order to take effect. Register 2100 can receive a user command to facilitate this process.
BACnet users write a 1 and Modbus users write 1234 to effect a soft reset. The MD-xxHD reboot time is
approximately 10 seconds.

See the Modbus examples document on the DENT Instruments web site or included with your electronic
documentation for additional support on programming Modbus. The following online resources are also
helpful.

http://Modbus.org/docs/PI_MBUS_300.pdf
http://www.Modbustools.com/Modbus.html
http://www.simplyModbus.ca/TCP.htm
http://www.tahapaksu.com/crc/

Windows Calculator (Programmer mode)

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BACnet

Building Automation and Control Network (BACnet) protocol was developed under the auspices of the

American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) and is recognized
as an American National, European, and ISO global standard.

BACnet Device ID. All device IDs on a BACnet network must be unique. Refer to the section “Serial
Protocols” and refer to the Register List for additional information

Serial

The MD-xxHD Serial version supports writable max_master, MS/TP address, max_info_frames
properties in the device object for MS/TP networks. For best network performance, the
max_master should be set to the highest MS/TP MAC address on the network. The MS/TP
address (object 1069) must be unique on the MS/TP network. The max_info_frames does not
need to be changed in most installations.

Ethernet

Ethernet versions can register as Foreign Devices to a BBMD. BBMD stands for BACnet/IP
Broadcast Management Device. The BBMD IP address can be set from VIewpointHD or

through character string object 2264. A value of 0.0.0.0 disables foreign device registration.
This process requires a processor soft reset.

BACnet Segmentation

The MD-xxHD meter does not support BACnet Segmentation. Segmentation is required when the
requested data is longer than the underlying data packet size limitations of the protocol, ie the Maximum
Transmission Unit (MTU). The MTU for BACnet MS/TP is 480 bytes and for BACnet/IP it is 1476 bytes.
This means that some objects with large data arrays will not fit within a packet. This limitation effectively
means that some BACnet client software cannot read the Structured View Object List. In this case the
BACnet client structured view mode may need to be disabled and the standard flat object view will need
to be used instead, particularly with BACnet MS/TP.

BACnet Structured View

The MD-xxHD meter supports the Structured View (SV) object container. If this option is supported in the
BACnet exploring tool, objects will be grouped logically into elements which can be named to reflect
electrical or physical locations, followed by system objects, as shown below for a MD-12HD having
elements A-D.

Within each element, Structured View lists the BACnet objects by Object Type and then by numeric
number as shown below. In addition objects for elements are grouped in a “hotel room” scheme. That is

65 Siemens Industry, Inc.

Element A (and system objects) have a range from 0-9999, Element B 10000-19999, Element 20000­29999, to Element P on the MD-48HD 150000-15999. Some BACnet explorer tools have additional
sorting capabilities.

MD-xxHD Supported BACnet Object Types

Object Type

Abbr

Typical Usage

Analog Input:

AI

Meter Readings (floating point numeric inputs)

Analog Value:

AV

Analog User Settings (floating point numeric outputs)

Binary Value:

BV

User Boolean Settings

Multi State Value:

MSV

Enumerated Settings

BitString Value:

BSV

Bitfield Status Words and Settings

Positive Integer Value:

PIV

Restricted Range User Settings

Character String Value:

CSV

User Text string settings

The following online BACnet resources are also helpful.

http://www.bacnet.org/

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Appendix A—MD-xxHD LCD Menu Navigation

About Meter

The complete LCD navigation map is shown in diagram form in the next few pages. The About Meter menu is
the most commonly accessed item which requires 5 down presses or 1 up (rolling menu) to access.

The About Meter menu contains the following items which are displayed 4 lines at a time and accessed by
using the ˄ ˅ keys on the front display.

67 Siemens Industry, Inc.

Menu Navigation

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Communication Navigation

69 Siemens Industry, Inc.

Appendix B—Enclosure Dimensions

MD-48HD Enclosure Dimensions MD-12HD Enclosure Dimensions

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Appendix C—Mounting Templates

Enclosure Internal Mounting Hole Locations

MD-48HD and MD-12HD Enclosure Drill Templates

71 Siemens Industry, Inc.

Sheet Metal Plate Mounting Hole Locations

MD-48HD and MD-12HD Mounting Plate Drill Templates

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Appendix D— MD-xxHD Technical Specifications

Specification

Description

Service Types

Single Phase, Split Phase, Three Phase-Four Wire (WYE), Three Phase-Three
Wire (Delta)

Voltage Channels

90-346 Volts AC Line-to-Neutral, 600V Line-to-Line, CAT III.
Two voltage reference inputs (MD-48HD only)

Current Channels

12 (MD-12HD) or 48 (MD-48HD) channels, 0.525 VAC max, 333 mV CTs, 0-4,000
Amps depending on current transducer

Maximum Current Input

150% of current transducer rating (mV CTs) to maintain accuracy. Measure up to
4000A with RōCoil CTs.

Measurement Type

True RMS using high-speed digital signal processing (DSP) with continuous
sampling

Line Frequency

50-60 Hz (45 – 70 Hz measureable range) – measurement taken L1-N

Power

From L1 Phase to L2 Phase. 90-600VAC RMS CAT III 50/60Hz, 500mA AC Max
Use of 12 volt auxiliary output requires 100 VAC minimum input voltage.

AC Protection

0.5A Fuse 200kA interrupt capacity

Power Out

Unregulated 12VDC output, 200 mA, self-resetting fuse

Waveform Sampling

1.8 kHz (MD-48HD), 3.6 HZ (MD-12HD)

Parameter Update Rate

1 second

Interval Data Recording

Energy (kWh) values are recorded every 15 minutes for 63 days (downloadable
log)

Each record is time stamped.

Measurements

Volts, Amps, kW, kVAR, kVA, aPF, dPF, kW demand, kVA demand, Import
(Received) kWh, Export (Delivered) kWh, Net kWh, Import (Received) kVAh,
Export (Delivered) kVAh, Net kVAh, Import (Received) kVARh, Export (Delivered)
kVARh, Net kVARh, THD, Theta, Frequency. All parameters for each phase and
system total.

Accuracy

0.2% ANSI C12.20-2010 Class 0.2

Resolution

Values reported in IEEE-754 single precision floating point format (32 bit)

Indicators

Optional 4-line display, tri-color backlight (PhaseChek™)

Alarm Output

Over/Under Voltage and Current (SPDT Relay - 30 Vdc)

Pulse Inputs

MD-12HD – 4 inputs
MD-48HD – 2 inputs **

3.3V sourcing voltage (current limited) to customer dry contact pulse output
Maximum Pulse Rate 10 HZ (50 msec minimum transition time)
** Available Q4 2018

Communication

Hardware

RS-485, Ethernet, & USB (for configuration only)

Supported Protocols

Modbus RTU or BACnet Master Slave Token Passing protocol (MS/TP)
Modbus (using SunSpec IEEE-754 single precision floating point model)

Max Communication
Length

1200 meters with Data Range of 100K bits/second or less

RS-485 Loading

1/8 unit

Information in this document is based on specifications believed correct at the time of publication. The right is
reserved to make changes as design improvements are introduced. Product or company names mentioned herein
may be the trademarks of their respective owners.
© 2019 Siemens Industry, Inc.

Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
USA
[phone]

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comments about this document, please send them

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Document No. A6V11564207

Printed in the USA

Page 73

Communication Rate
(baud)

9600 (Default), 19200, 38400, 57600, 76800, 115200

Data Bits

8

Parity

None, Even, Odd

Stop Bit

2, 1

Termination

None provided

Data Formats

Modbus RTU, BACnet MS/TP, Modbus TCP or BACnet IP

Mechanical

Wire Connections

12-22 AWG 600 Vac, Voltage connection must be #14 AWG or larger & 600 VAC
rated

Mounting

Enclosure or Panel Mount

High Voltage Cover

IP30. Available with MD-48HD/MD-12HD Enclosure and MD-48HD Plate models

Operating Temperature

-20 to + 60⁰ C (-4 to 140⁰ F) (the colder the temperature the more voltage is
needed to power the board)

Humidity

5% to 95% non-condensing

Enclosure

ABS Plastic, 94-V0 flammability rating, connections sized for 1–inch EMT conduit

MD-48HD Dimensions

(L) 33.7cm × (W) 25.1cm × (H) 8.0 cm (13.3” × 9.8” × 3.1”) (enclosure version)
(L) 26.2cm × (W) 24.1cm × (H) 8.0 cm (10.3” × 9.5” × 3.1”) (mounting plate

version)

MD-12HD Dimensions

(L) 24.8cm × (W) 25.1cm × (H) 8.0 cm (9.8” × 9.8” × 3.1”) (enclosure version)
(L) 17.8cm × (W) 26.3cm × (H) 8.0 cm (7.0” × 10.4” × 3.1”) (mounting plate

version)

PCBA Dimensions

(L) 21.6cm × (W) 21.6cm × (H) 6.4 cm (8.5” × 8.5” × 2.5”)

ViewPoint™ HD Minimum System Requirements

Operating System

Windows® 7, Windows® 8, Windows® 10

Communications Port

USB or Ethernet connectivity

Safety

FCC Compliance

This device has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at
user’s own expense.

Serial/Ethernet Meters

The following are UL Recognized: MD-12HD-P-y-z, MD-48HD-P-y-z
The following are UL Listed: MD12HD-C-y-z , MD-48HD-C-y-z
Conforms to UL Std 61010-1, 3rd Edition, UL 61010-2-30:2010
Certified to CSA Std C22.2 No. 61010-1, 3rd Edition