Satec PM172P User manual

Series PM172 Powermeters
PM172P/PM172E/PM172EH
Modbus Communications Protocol
Reference Guide
BG0400 Rev. A6

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Every effort has been made to ensure that the material herein is complete and accurate.
However, the manufacturer is not responsible for any mistakes in printing or faulty
instructions contained in this book. Notification of any errors or misprints will be received
with appreciation.
For further information regarding a particular installation, operation or maintenance of
equipment, contact the manufacturer or your local representative or distributor.
REVISION HISTORY
A1 May 2006 Release
A2 May 2006 F/W versions 13.1.7, 14.1.7, 15.1.8, 16.1.9 or higher
Added GE EGD protocol setup
Added 16-bit BC scaling option in the DNP Options setup
A3 Apr 2007 F/W versions 13.1.11, 14.1.11 or higher
CT primary current extended to 20,000A.
A4 Nov 2007 PM172P/E, F/W version 13.1.16 or higher
Added DST start/end hour setup.
Added the current unbalance trigger.
Added 16-bit and 32-bit frozen analog inputs and Time and Date object to the Class 0
point list.
Added 3-min power demand interval.
A5 June 2008 PM172P/E, F/W versions 13.1.19 and later, 13.71.12 or higher.
Added programmable starting current.
Added instrument transformer correction.
A6 Sep 2009 F/W versions 13.2.2, 13.72.2, 14.2.2, 14.72.2 or higher.
Added TCP event notification client.
Added GPRS setup and communication counters.
Modbus is a trademark of Schneider Electric.

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Table of Contents
1GENERAL ..........................................................................................................8
2MODBUS PROTOCOL IMPLEMENTATION......................................................9
2.1 Transmission Modes......................................................................................... 9
2.2 Address Field ................................................................................................... 9
2.3 Function Field .................................................................................................. 9
2.4 Exception Responses........................................................................................ 9
2.5 Modbus Register Addresses ............................................................................. 9
2.6 Data Formats ................................................................................................. 10
2.6.1 16-bit Scaled Integer Format .............................................................................10
2.6.2 32-bit Long Integer Format................................................................................11
2.6.3 32-bit Modulo-10000 Format..............................................................................12
2.7 User Assignable Registers.............................................................................. 12
2.8 Password Protection ...................................................................................... 12
2.9 Data Recording and File Transfers ................................................................. 13
2.9.1 Log File Organization ........................................................................................13
Multi-section Files...............................................................................................13
Data Log Files ....................................................................................................13
Profile Data Log File ............................................................................................ 14
Waveform Log Files............................................................................................. 14
2.9.2 File Transfers...................................................................................................14
Common File Transfer .........................................................................................14
Reading a Profile Log File.....................................................................................15
Reading Waveform Files.......................................................................................15
Reading Real-time Waveforms..............................................................................16
2.10 TCP Notification Client ................................................................................... 16
3MODBUS REGISTER MAP..............................................................................18
3.1 Modbus Setup Registers................................................................................. 18
Modbus Assignable Registers................................................................................18
Assignable Registers Map.....................................................................................18
Modbus Conversion Scales ...................................................................................18
Device Data Scales .............................................................................................18
3.2 16-bit Scaled Analog Registers and Energy Counters - Basic Register Set ..... 19
3.3 16-bit Scaled Analog Registers, Binary Registers and Counters ..................... 21
None.................................................................................................................21
Special Inputs ....................................................................................................21
Event Flags (bitmap) EH .......................................................................................21
Digital Inputs (bitmap) ........................................................................................21
Relay Outputs (bitmap) .......................................................................................21
Counters ...........................................................................................................21
1-Cycle Phase Values ..........................................................................................21
1-Cycle Total Values............................................................................................22
1-Cycle Auxiliary Values ......................................................................................22
Phasor ..............................................................................................................22
1-Second Phase Values........................................................................................23
1-Second Total Values.........................................................................................23
1-Second Auxiliary Values.................................................................................... 24
Present Harmonic Demands..................................................................................24
Present Volt, Ampere and Power Demands .............................................................24
Total Energies E..................................................................................................25
Phase Energies E.................................................................................................25
V1/V12 Harmonic Distortions EH ............................................................................25
V2/V23 Harmonic Distortions EH ............................................................................26
V3/V31 Harmonic Distortions EH ............................................................................26

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I1 Harmonic Distortions EH ................................................................................... 26
I2 Harmonic Distortions EH ................................................................................... 26
I3 Harmonic Distortions EH ................................................................................... 26
Fundamental (H01) Phase Values..........................................................................26
Harmonic Total Values......................................................................................... 27
Minimum 1-Cycle Phase Values.............................................................................27
Minimum 1-Cycle Total Values..............................................................................27
Minimum 1-Cycle Auxiliary Values......................................................................... 27
Maximum 1-Cycle Phase Values............................................................................28
Maximum 1-Cycle Total Values .............................................................................28
Maximum 1-Cycle Auxiliary Values ........................................................................28
Maximum Demands ............................................................................................28
Maximum Harmonic Demands ..............................................................................29
Scaled Analog Inputs...........................................................................................29
Raw Analog Inputs..............................................................................................29
TOU Parameters E...............................................................................................29
Scaled Analog Outputs.........................................................................................29
TOU Energy Register #1 E....................................................................................29
TOU Energy Register #2 E....................................................................................29
TOU Energy Register #3 E....................................................................................30
TOU Energy Register #4 E....................................................................................30
TOU Energy Register #5 E....................................................................................30
TOU Energy Register #6 E....................................................................................30
TOU Energy Register #7 E....................................................................................30
TOU Energy Register #8 E....................................................................................30
Summary Energy Accumulated Demands E.............................................................30
Summary Energy Block Demands E........................................................................30
Summary Energy Sliding Window Demands E..........................................................31
Summary Energy Maximum Demands E..................................................................31
TOU Maximum Demand Register #1 E....................................................................31
TOU Maximum Demand Register #2 E....................................................................31
TOU Maximum Demand Register #3 E....................................................................31
TOU Maximum Demand Register #4 E....................................................................31
TOU Maximum Demand Register #5 E....................................................................31
TOU Maximum Demand Register #6 E....................................................................31
TOU Maximum Demand Register #7 E....................................................................32
TOU Maximum Demand Register #8 E....................................................................32
V1/V12 Harmonic Angles EH ..................................................................................32
V2/V23 Harmonic Angles EH ..................................................................................32
V1/V31 Harmonic Angles EH ..................................................................................32
I1 Harmonic Angles EH .........................................................................................32
I2 Harmonic Angles EH .........................................................................................32
I3 Harmonic Angles EH .........................................................................................32
Setpoint Status (bitmap) .....................................................................................33
3.4 32-bit Analog Registers, Binary Registers and Counters ................................ 34
Special Inputs ....................................................................................................34
Event Flags (bitmap) EH .......................................................................................34
Digital Inputs DI1-DI2 (bitmap)............................................................................34
Relay Outputs RO1-RO2 (bitmap)..........................................................................34
Counters ...........................................................................................................34
1-Cycle Phase Values ..........................................................................................34
1-Cycle Total Values............................................................................................35
1-Cycle Auxiliary Values ......................................................................................35
Phasor ..............................................................................................................35
1-Second Phase Values........................................................................................36
1-Second Total Values.........................................................................................36
1-Second Auxiliary Values.................................................................................... 37
Present Harmonic Demands..................................................................................37
Present Volt, Ampere and Power Demands .............................................................37
Total Energies E..................................................................................................38

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Summary Energy Registers E................................................................................38
Phase Energies E.................................................................................................38
V1/V12 Harmonic Distortions EH ............................................................................39
V2/V23 Harmonic Distortions EH ............................................................................39
V3/V31 Harmonic Distortions EH ............................................................................39
I1 Harmonic Distortions EH ................................................................................... 39
I2 Harmonic Distortions EH ................................................................................... 39
I3 Harmonic Distortions EH ................................................................................... 39
Fundamental (H01) Phase Values..........................................................................39
Harmonic Total Values......................................................................................... 40
Minimum 1-Cycle Phase Values.............................................................................40
Minimum 1-Cycle Total Values..............................................................................40
Minimum 1-Cycle Auxiliary Values......................................................................... 41
Maximum 1-Cycle Phase Values............................................................................41
Maximum 1-Cycle Total Values .............................................................................41
Maximum 1-Cycle Auxiliary Values ........................................................................41
Maximum Demands ............................................................................................41
Maximum Harmonic Demands ..............................................................................42
Scaled Analog Inputs...........................................................................................42
Raw Analog Inputs..............................................................................................42
TOU Parameters E...............................................................................................42
Scaled Analog Outputs.........................................................................................42
TOU Energy Register #1 E....................................................................................42
TOU Energy Register #2 E....................................................................................43
TOU Energy Register #3 E....................................................................................43
TOU Energy Register #4 E....................................................................................43
TOU Energy Register #5 E....................................................................................43
TOU Energy Register #6 E....................................................................................43
TOU Energy Register #7 E....................................................................................43
TOU Energy Register #8 E....................................................................................43
Summary Energy Accumulated Demands E.............................................................43
Summary Energy Block Demands E........................................................................44
Summary Energy Sliding Window Demands E..........................................................44
Summary Energy Maximum Demands E..................................................................44
TOU Maximum Demand Register #1 E....................................................................44
TOU Maximum Demand Register #2 E....................................................................44
TOU Maximum Demand Register #3 E....................................................................44
TOU Maximum Demand Register #4 E....................................................................44
TOU Maximum Demand Register #5 E....................................................................44
TOU Maximum Demand Register #6 E....................................................................45
TOU Maximum Demand Register #7 E....................................................................45
TOU Maximum Demand Register #8 E....................................................................45
V1/V12 Harmonic Angles EH ..................................................................................45
V2/V23 Harmonic Angles EH ..................................................................................45
V1/V31 Harmonic Angles EH ..................................................................................45
I1 Harmonic Angles EH .........................................................................................45
I2 Harmonic Angles EH .........................................................................................45
I3 Harmonic Angles EH .........................................................................................45
Generic TOU Season Energy Registers ID’s E...........................................................46
Generic TOU Season Maximum Demand Registers ID’s E...........................................46
Setpoint Status SP1-SP16 (bitmap).......................................................................46
3.5 Minimum/Maximum Log Registers................................................................. 46
Minimum Phase Values........................................................................................46
Minimum Total Values .........................................................................................47
Minimum Auxiliary Values ....................................................................................47
Maximum Phase Values .......................................................................................48
Maximum Total Values.........................................................................................48
Maximum Auxiliary Values ...................................................................................49
Summary Energy Maximum Demands E..................................................................49
Maximum Demands ............................................................................................49

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Maximum Harmonic Demands ..............................................................................50
TOU Maximum Demand Register #1 E....................................................................50
TOU Maximum Demand Register #2 E....................................................................50
TOU Maximum Demand Register #3 E....................................................................51
TOU Maximum Demand Register #4 E....................................................................51
TOU Maximum Demand Register #5 E....................................................................51
TOU Maximum Demand Register #6 E....................................................................51
TOU Maximum Demand Register #7 E....................................................................51
TOU Maximum Demand Register #8 E....................................................................52
3.6 Device Control and Status Registers .............................................................. 53
Device Restart Register .......................................................................................53
Device Authorization Registers..............................................................................53
Event Flags Control EH .........................................................................................53
Remote Relay Control..........................................................................................53
Device Reset/Clear Registers................................................................................53
Device Identification............................................................................................54
Device Status Registers .......................................................................................54
Log Notification Registers E...................................................................................54
Alarm Notification Registers .................................................................................54
Communication Status.........................................................................................55
Communication Counters.....................................................................................55
3.7 Device Setup Registers .................................................................................. 56
Device Identification............................................................................................56
Factory Device Settings .......................................................................................56
Basic Setup........................................................................................................56
Communication Ports Setup .................................................................................57
Device Options Setup ..........................................................................................58
Local Settings ....................................................................................................58
Clock Indication and Setup...................................................................................59
Alarm/Event Setpoints Setup................................................................................59
Data Log Setup E................................................................................................60
Pulse Counters Setup ..........................................................................................61
Analog Outputs Setup..........................................................................................61
Analog Expander Setup........................................................................................61
Digital Inputs Setup............................................................................................62
Periodic Timers Setup E........................................................................................62
File Setup E........................................................................................................62
Network Setup ...................................................................................................62
Password Setup..................................................................................................63
Expert Power Service Setup .................................................................................63
Internet Service Provider (ISP) accounts................................................................63
GPRS Setup .......................................................................................................63
TCP Notification Client Setup ................................................................................63
Transformer Correction Setup...............................................................................63
EGD Producer Exchanges Setup ............................................................................ 64
DNP Options Setup .............................................................................................64
DNP Events Setup...............................................................................................65
DNP Class 0 Point Assignments.............................................................................65
Waveform Recorder Setup EH ................................................................................66
TOU Daily Profile Setup E.....................................................................................66
TOU Calendar Setup E..........................................................................................67
Summary Energy/TOU Registers Setup E................................................................67
Summary Energy/TOU Registers Source Setup E......................................................68
Digital Inputs Setup............................................................................................68
Relay Outputs Setup ...........................................................................................68
Analog Inputs Setup............................................................................................68
Analog Outputs Setup..........................................................................................69
3.8 Analog and Digital I/O Configuration............................................................. 70
I/O Slots Configuration Info .................................................................................70
I/O Type Info.....................................................................................................70

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3.9 File Transfer Registers E................................................................................. 71
File Allocation Status Registers .............................................................................71
File Transfer Control/Status Registers....................................................................71
Event Log File Transfer Registers ..........................................................................73
Data Log File Transfer Registers............................................................................73
Waveform Header Transfer Registers EH .................................................................75
Waveform Series Transfer Block EH ........................................................................76
3.10 Billing/TOU Daily Profile Data Log E............................................................... 77
4DATA SCALES AND UNITS............................................................................79
Data Scales .......................................................................................................79
Data Units .........................................................................................................79
5DATA FORMATS .............................................................................................80
Timestamp ........................................................................................................80
Wiring Mode.......................................................................................................80
File Attributes ....................................................................................................80
File Status Word.................................................................................................80
File Record Status Word.......................................................................................80
File Allocation Map..............................................................................................80
Profile Log Sections Map ......................................................................................80
Waveform Log Channel Mask................................................................................80
TOU Tariff Change Time.......................................................................................80
Summary/TOU Energy Register Source ID..............................................................81
Setpoint Trigger Parameters ID.............................................................................81
Pulse Inputs.......................................................................................................81
Relays...............................................................................................................81
Setpoint Action ID ..............................................................................................83
Counter Source ID ..............................................................................................84
Relay Output Pulse Source ID E.............................................................................84
AO/Analog Expander Output Parameters ID............................................................84
Event Cause/Point ID ..........................................................................................84
Event Effect ID...................................................................................................85
Data Point ID .....................................................................................................85
Device Diagnostics..............................................................................................86
DNP Object Types...............................................................................................86
DNP Class 0 Objects............................................................................................87
Log Notification Status.........................................................................................87
Data Log Notification Status .................................................................................87
Instrument Options............................................................................................. 87
I/O Slot Types....................................................................................................87

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1 General
This document specifies a subset of the Modbus serial communications protocol used to
transfer data between a master computer station and the PM172. The document provides
the complete information necessary to develop third-party communications software
capable of communication with the Series PM172 instruments. Additional information
concerning communications operation, configuring the communications parameters, and
communications connections is found in "Series PM172 Powermeters, Installation and
Operation Manual".
IMPORTANT
In 3-wire connection schemes, the unbalanced current and phase readings for power factor,
active power, and reactive power will be zeros, because they have no meaning. Only the
total three-phase power values will be shown.
Most of the advanced features are configured using multiple setup parameters that can be
accessed in a number of contiguous registers. When writing the setup registers, it is
recommended to write all the registers at once using a single request, or to clear (zero) the
setup before writing into separate registers.
Designations used in the guide:
E - available in the meters with the E and EH suffixes
EH- available in the meters with the EH suffix

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2 Modbus Protocol Implementation
For detailed information about Modbus protocol, Modbus message framing and error checking,
refer to the "Modicon Modbus Protocol Reference Guide". It can be downloaded from the
www.modbus.org Website. The following paragraphs outline some issues concerning the
implementation of the Modbus protocol in the PM172.
2.1 Transmission Modes
The PM172 can be set up to communicate on a Modbus network using RTU transmission
mode. Refer to the "Series PM172 Powermeters, Installation and Operation Manual" on how
to select the transmission mode in your meter.
2.2 Address Field
The address field contains a user assigned address of the instrument (1-247) on a Modbus
network. Broadcast mode using address 0 is not supported.
2.3 Function Field
The Modbus functions implemented in the PM172 are shown in Table 2-1. Function 04 can
be used in the same context as function 03.
Table 2-1 Modbus Function Codes
Code (decimal) Meaning in Modbus Action
03 Read holding registers Read multiple registers
04 Read input registers Read multiple registers
06 Preset single register Write single register
16 Preset multiple registers Write multiple registers
081Loop-back test Communications test
1 The PM172 supports only diagnostic code 0 - return query data.
2.4 Exception Responses
The instrument sends an exception response when an error is detected in the received
message. To indicate that the response is notification of an error, the high order bit of the
function code is set to 1.
Implemented exception response codes:
01 - Illegal function
02 - Illegal data address
03 - Illegal data value
04 - Device failure
When the character framing, parity, or redundancy check detects a communication error,
processing of the master's request stops. The instrument will not act on or respond to the
message.
2.5 Modbus Register Addresses
The PM172 Modbus registers are numbered in the range of 0 to 65535. From the Modbus
applications, the PM172 Modbus registers can be accessed by simulating holding registers of
the Modicon 584, 884 or 984 Programmable Controller, using a 5-digit “4XXXX” or 6-digit
“4XXXXX” addressing scheme.

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To map the PM172 register address to the range of the Modbus holding registers, add a
value of 40001 to the PM172 register address. When a register address exceeds 9999, use
a 6-digit addressing scheme by adding 400001 to the PM172 register address.
2.6 Data Formats
The PM172 uses three data formats to pass data between a master application and the
instrument: 16-bit short integer, 32-bit long integer and 32-bit modulo-10000 formats.
Binary values and counters are always transmitted in 32-bit registers, while analog values
can be read both in 32-bit and in 16-bit scaled registers.
Analog registers 256 through 308 and 6656 through 10935 contain scaled 16-bit values.
2.6.1 16-bit Scaled Integer Format
16-bit scaled analog data is transmitted in a single 16-bit Modbus register being scaled to
the range of 0 to 9999. To get a true reading, a reverse conversion should be done using
the following formula:
LO
9999 )LOHI(X
Y+
−×
=
where:
Y - True reading in engineering units
X - Raw input data in the range of 0 to 9999
LO and HI - Data low and high scales in engineering units
The engineering scales are indicated for every scaled 16-bit register. Refer to Section 4
“Data Scales and Units” for applicable data scales and measurement units.
The default voltage scale in the device is 144V (120V+20%). It can be changed through
register 242 (see Section 3.1, Device Data Scales), or via the supplemental PAS software.
The recommended voltage scale is 120V+20% = 144V for using with external PT’s, and
690V+20% = 828V for a direct connection to power line.
CONVERSION EXAMPLES
1. Voltage readings
a) Assume device settings (direct wiring): PT ratio = 1; Voltage scale = 828V (690V + 20%).
Voltage engineering scales (see Section 4):
HI_ENG = Vmax = 828.0 ×PT ratio = 828.0 ×1 = 828.0V
LO_ENG = 0V
If the raw data reading is 1449 then the voltage reading in engineering units will be as follows:
Volts reading = 1449 ×(828.0 - 0)/(9999 - 0) + 0 = 120.0V
b) Assume device settings (wiring via PT): PT ratio = 14,400V : 120V = 120; Voltage scale = 144V.
Voltage engineering scales (see Section 4):
HI_ENG = Vmax = 144.0 ×PT ratio = 144 ×120 = 17,280V
LO_ENG = 0V
If the raw data reading is 8314 then the voltage reading in engineering units will be as follows:
Volts reading = 8314 ×(17,280 - 0)/9999 + 0 = 14,368V
2. Current readings
Assume device settings: CT primary current = 200A.
Current engineering scales (see Section 4):
HI_ENG = Imax = CT primary current ×2 = 200.00 ×2 = 400.00A
LO_ENG = 0A

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If the raw data reading is 250 then the current reading in engineering units will be as follows:
Amps reading = 250 ×(400.00 - 0)/(9999 - 0) + 0 = 10.00A
3. Power readings
a) Assume device settings (direct wiring): Wiring 4LL3; PT = 1; CT primary current = 200A; Voltage
scale = 828V.
Active Power engineering scales (see Section 4):
HI_ENG = Pmax = Vmax ×Imax ×2 = (828.0 ×1) ×(200.00 ×2) ×2 = 662,400W = 662.400kW
LO_ENG = -Pmax = -662.400kW
If the raw data reading is 5500 then the power reading in engineering units will be as follows:
Watts reading = 5500 ×(662.400 - (-662.400))/(9999 - 0) + (-662.400) = 66.313kW
If the raw data reading is 500 then the power reading in engineering units will be as follows:
Watts reading = 500 ×(662.400 - (-662.400))/(9999 - 0) + (-662.400) = -596.153kW
b) Assume device settings (wiring via PT): Wiring 4LN3; PT = 120; CT primary current = 200A.
Active Power engineering scales (see Section 4):
HI_ENG = Pmax = Vmax ×Imax ×3 = (828 ×120) ×(200.00 ×2) ×3/1000 = 119,232kW
LO_ENG = -Pmax = -119,232kW
If the raw data reading is 5500 then the power reading in engineering units will be as follows:
Watts reading = 5500 ×(119,232 - (-119,232))/(9999 - 0) + (-119,232) = 11,936kW
If the raw data reading is 500 then the power reading in engineering units will be as follows:
Watts reading = 500 ×(119,232 - (-119,232))/(9999 - 0) + (-119,232) = -107,307kW
4. Power Factor readings
Power factor engineering scales (see Section 3.3):
HI_ENG = 1.000.
LO_ENG = -1.000.
If the raw data reading is 8900 then the power factor in engineering units will be as follows:
Power factor reading = 8900 ×(1.000 - (-1.000))/(9999 - 0) + (-1.000) = 0.78
2.6.2 32-bit Long Integer Format
32-bit long integer data is transmitted in two adjacent 16-bit Modbus registers as unsigned
(UINT32) or signed (INT32) whole numbers.
The first register contains the low-order word (lower 16 bits) and the second register
contains the high order word (higher 16 bits). The low-order word always starts at an even
Modbus address. The value range for unsigned data is 0 to 4,294,967,295; for signed data
the range is -2,147,483,648 to 2,147,483,647.
If your Modbus driver does not support a 32-bit long integer format, you can read the two
16-bit registers separately, and then convert them into a 32-bit value as follows (using C
notation):
32-bit value = (signed short)high_order_register ×65536L + (unsigned short)low_order_register
EXAMPLES
1. Unsigned 32-bit Values
If you read unsigned Voltage V1 of 69,000V from registers 13952-13953, then the register readings will
be as follows:
(13952) = 3464
(13953) = 1
The 32-bit value is (1 x 65536 + 3464) = 69000V.

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2. Signed 32-bit Values
If you read signed kW of -789kW from registers 14336-14337, then the register readings will be:
(14336) = 64747 (unsigned)
(14337) = 65535 (unsigned) or -1(signed value).
To take the high order register as a signed value, compare it with 32767. If the value is less or equal to
32767, use it as is. If it is greater than 32767, then this is a negative number in a two's complement
code (like in our example) - just subtract it from 65536 to get the original negative value.
The 32-bit reading is (-1 x 65536 + 64747) = -789kW.
Fractional 32-bit data is transmitted using a decimal pre-multiplier to pass fractional
numbers in an integer format. Fractional numbers are pre-multiplied by 10 to the power N,
where N is the number of digits in the fractional part.
For example, the frequency reading of 50.01 Hz is transmitted as 5001, having been pre-
multiplied by 100. Whenever a data register contains a fractional number, the register
measurement unit is given with a multiplier ×0.1, ×0.01 or ×0.001, showing the weight of
the least significant decimal digit. To get an actual fractional number with specified
precision, multiply the register value by the given multiplier. To write a fractional number
into the register, divide the number by the given multiplier.
2.6.3 32-bit Modulo-10000 Format
Energy counters 287-294 and 301-302 are read in two contiguous 16-bit registers in a
modulo-10000 format. The first (low order) register contains the value mod 10000, and the
second (high order) register contains the value/10000. To get the true energy reading, the
high order register value should be multiplied by 10,000 and added to the low order
register.
2.7 User Assignable Registers
The PM172 contains 120 user assignable registers in the address range of 0 to 119, any of
which you can map to any register address accessible in the instrument. Registers that
reside in different locations may be accessed by a single request by re-mapping them to
adjacent addresses in the user assignable registers area.
The actual addresses of the assignable registers, which are accessed via addresses 0
through 119, are specified in the register map (registers 120 through 239), where register
120 contains the actual address of the register accessed via register 0, register 121
contains the actual address of the register accessed via register 1, and so on. The
assignable registers and the map registers themselves may not be re-mapped.
To build your own register map, write to map registers 120 to 239 the actual addresses you
want to read from or write to via the assignable area (registers 0 to 119). 32-bit long
registers should always be aligned at even addresses.For example, if you want to read
registers 7136 (1-second V1 voltage, scaled short integer) and 14720-14721 (kWh Import,
long integer) via registers 0-2, do the following:
- write 14720 to register 120
- write 14721 to register 121
- write 7136 to register 122
Reading from registers 0-2 will return the kWh reading in registers 0 (low 16 bits) and 1
(high 16 bits), and the voltage reading in register 2.
2.8 Password Protection
The PM172 has a password protection option allowing you to protect your setups,
cumulative registers and logs from being changed or cleared through communications. You
can disable or enable password protection through communications or via the front display.
For details, refer to your instrument Installation and Operation Manual.

13
When password protection is enabled, the user password you set in your instrument should
be written into the device authorization register (2575) before another write request is
issued. If the correct password is not supplied while password protection is enabled, the
instrument will respond to all write requests with the exception code 01 (illegal operation).
It is recommended to clear the password register after you have completed your changes in
order to activate password protection.
2.9 Data Recording and File Transfers
2.9.1 Log File Organization
Historical files are stored to the non-volatile memory with a battery backup. Memory is
allocated for each file statically when you set up your files and will not change unless you
re-organize the files. The PM172 automatically performs de-fragmentation of the memory
each time you re-organize your files. This helps keep all free memory in one continuous
chunk and thus prevents possible leakage of memory caused by fragmentation.
Data records in a file are arranged in the order of their recording. Each record has a unique
16-bit sequence number that is incremented modulo 65536 with each new record. The
sequence number can be used to point to a particular record in the file, or to check the
sequence of records when uploading files from the device.
Each file has a write position pointer that indicates the place where the next record will be
recorded, and a read position pointer that indicates the place from where the current record
will be read. Both pointers show sequence numbers of the records they point to rather than
record offsets in the file.
After acknowledging a record you have read, the read pointer automatically advances to the
next record in the file. When the read pointer gets to the record to which the file write
pointer points, the end-of-file (EOF) flag is set. It is automatically cleared when a new
record is added to the file, or when you explicitly move the read pointer to any record
within a file.
If a file has a wrap-around attribute (circular file), the most recent records can overwrite
the oldest records. When this happens at the current read position, the read pointer
automatically advances forward in order to point to the oldest record in the file.
The PM172 keeps a separate read pointer for each communication port so that access to the
same file through a different port will not affect current active sessions for other ports.
Multi-section Files
Log files can have one or more (up to 16) sections for multi-channel recording. An ordinal
file consists of a single section. Some files, such as daily profile log files and waveform log
files, are arranged as multi-section files.
A multi-section file is subdivided into multiple sections of the same structure, one section
per recording channel. The number of sections in each file is defined at the time you set up
your files and may not change unless you re-organize the file. Each section within a multi-
section file can be addressed through a particular register window related to the section.
A multi-section file has a single write position pointer for all sections and stores data in all
sections simultaneously. This means that records with the same sequence number in all
sections are associated with the same event. A multi-section file has also a single read
position pointer for all sections.
Data Log Files
Data log files can store up to 16 measured parameters per a record. Any data measured by
the device can be stored in the log file. The number of parameters that each record will hold
and the list of parameters you want to be recorded in the file can be selected through the
Data log setup registers for a particular file.
Recording data to the data log files can be triggered through the setpoints, either on a time
basis using the meter clock or periodic timers, or upon any event detected by the setpoints.

14
Profile Data Log File
Data log file #8 can be configured for a daily profile log of the energy usage and maximum
demand registers. A profile log file is organized as a multi-section file that has a separate
section for each energy and maximum demand register. A file record stores the summary
data (total of all tariffs) and all tariff data for each configured Summary/TOU register. See
Section 3.10 for information on the file record structure.
The number of sections is taken automatically from the Summary/TOU Registers setup.
Since each Summary/TOU energy register has a shadow maximum demand register, the
number of sections in the file can be twice the number of the allocated Summary/TOU
registers. Always configure the Summary/TOU registers before you allocate memory for
your profile log file.
New records are added to the file automatically every day at midnight. You can review the
list of parameters that are recorded to the file through the Data log #8 setup. It is preset
automatically by the meter and shows the recorded data for the first file section, which
represents the first configured energy usage register.
Waveform Log Files
Waveform log files are organized as multi-section files that store data for each recording
channel in a separate section. A waveform log file can record 6 AC channels simultaneously:
three voltage and three current waveforms. The number of sections in a file, or channels
that a file can store, is defined when you set up the file. The channels that a file will record
are selected in the waveform log setup. All selected channels are recorded in successive file
sections.
A waveform file has a single read pointer for all sections, so that data from all channels of a
single record can be read together without repositioning the file pointer. When you point to
a particular file record, data from all sections related to the same event are all available for
a read. Moreover, the PM172 takes all channel data for the currently accessed record to a
separate buffer, so that even when the record is overwritten at the time of reading, you are
still prevented from receiving partially updated data.
A single waveform record for a channel can contain up to 512 points of the sampled input
signal. Refer to the line frequency field in the channel header record to correctly set up the
time scale for the waveforms.
If a waveform log is configured to record more samples per event than a single record can
hold, the waveform recorder will store as many records per event as required to record the
entire event. All waveform records related to the event are merged in a series and have the
same series number, so that they can be plotted together. Each record within a series has a
unique serial number that allows tracking the sequence of records in a series. A single
waveform series can hold up to 81,920 points (2,560 cycles at a rate of 32 samples per
cycle) of a sampled AC signal.
2.9.2 File Transfers
File transfer protocol provides both data transfer and information services. File transfer is
performed through blocks of registers separate for each file and file section. File transfer
control registers allow changing the file or section position in order to point to the desired
record.
The information service uses separate status/control registers for each file. The extended
file information is available including current file pointers’ positions, the number of records
in the file, allocated file size, and more.
See Section 3.9 File Transfer Registers for information on register locations.
Common File Transfer
Log files can be read either in a sequence record-by-record, or in a random order. Each
read request fills the corresponding register block with the data of the record pointed to by
the file (or section) read pointer. If you want to begin reading a file from a particular
record, which sequence number is known, you can change the pointer position by writing
the desired sequence number into the file transfer control register. If you want to read a file
from the beginning, you can simply write a corresponding command to the file command

15
register that moves the pointer to the oldest file record. If you do not change the file
position, then you will continue reading the file from the record following the one you have
read the last time you accessed the file.
You need not explicitly move the file position to the following record if you want to continue
reading a file in a sequence after you have uploaded the current record. Instead, continue
reading the file through the file transfer block.
For the event log files, the file transfer block can contain up to 12 records that can be read
at once: the file position automatically moves to the record following the last one you have
just read in the file transfer block.
The file transfer is completed after you have read the last record of the file. Before storing a
file record to your database, always check bit 1 in the record status word, which contains
the end-of-file (EOF) flag. This bit set to 1 indicates that the file read pointer does not point
to any record within the file, and you should not store any record that has this bit set. The
EOF flag is set only after you have read the last record of the file, so that testing for end-of-
file requires one extra read. If you wish to stop the transfer just after storing the last file
record, check bit 0 in the record status word. Bit 0 is set to 1 only once when you read the
last record of the file.
The following gives a summary of steps you should do to read an ordinal log file:
1. If you want to begin reading a file from a particular record or from the first record,
either set the file position to the desired record sequence number, or preset the file
position to point to oldest record.
2. Read the record data through the corresponding file transfer block. The file pointer will
be automatically moved to the next file record.
3. Repeat steps 1-2 until all the file records are read, i.e., until either bit 0 or bit 1 is set in
the record status word.
Reading a Profile Log File
Reading a multi-section profile log file does not differ from reading ordinal files with the only
exception that each file section is accessed through a separate transfer block.
If you want to know which registers are recorded to the file sections before reading them,
check the daily profile log sections map through registers 3504-3505 (see Section 3.9, File
Transfer Registers). This is a bitmap that contains one in a bit position if a designated
register is recorded to the file, and contains zero if it is not.
The following gives a summary of steps for a multi-section file:
1. If you want to begin reading a file section from a particular record or from the first
record, either set the file section position to the desired record sequence number, or
preset the file section position to point to oldest record.
2. Read the record data through the corresponding file section transfer block. The file
pointer automatically moves to the next file record.
3. Repeat steps 1-2 until all the file section records are read, i.e., until either bit 0 or bit 1
is set in the record status word.
Reading Waveform Files
Each waveform record consists of 6 channel records that are read in sequence always
starting with channel V1. Each channel’s data is read in two stages. The channel header
record is read first through a separate transfer block followed be reading the channel
sample series. When the channel V1 header is first accessed, the meter stores the
waveform records for all channels together into a communication buffer so you can then
read them through the dedicated transfer blocks without the risk of losing data. The
following gives a summary of steps for a waveform file:
1. If you want to begin reading a file from a particular record or from the first record,
either set the file position to the desired record sequence number, or preset the file
position to point to oldest record.

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2. Read the V1 channel header data through the corresponding waveform header transfer
block. The record data is moved to the port’s communication buffer, and then the file
pointer automatically moves to the next record.
3. Read the V1 channel sample series through the waveform series transfer block.
4. Read the next channel’s header data through the corresponding waveform header
transfer block.
5. Read the sample series for the selected channel through the waveform series transfer
block.
6. Repeat steps 4, 5 until all channels’ records are read.
7. Repeat steps 2-6 until all the file records are read.
Reading Real-time Waveforms
Real-time waveforms are accessed through the separate transfer blocks just like the
waveform log data. The meter provides a large waveform buffer that can simultaneously
store 6 waveform records – three voltage and three current waveforms. Each time you read
the V1 channel header record, the meter captures new waveforms to the buffer so that you
can then read all of them through the waveform transfer blocks. The following gives a
summary of steps for reading real-time waveforms:
1. Read the V1 channel header data through the corresponding real-time waveform header
transfer block. The captured waveform’s data is moved to the port’s communication
buffer.
2. Read the V1 channel sample series through the waveform series transfer block.
3. Read the next channel’s header data through the corresponding waveform header
transfer block.
4. Read the sample series for the selected channel through the waveform series transfer
block.
5. Repeat steps 3, 4 until all channels’ records are read.
2.10 TCP Notification Client
The TCP notification client can establish connections with a remote Modbus/TCP server and send
notification messages either on events, or periodically on a time basis.
Notification messages are sent via a block of 16 Modbus registers using write function 16. The
following table shows the message exchange structure.
Modbus
Register Description Type Comment
+0-1 Device serial number UINT32
+2-4 Device MAC address CHAR6
+5 Device address UINT16 Device port address
+6-7 Device IP address UINT32 Network byte order
+8 Event type UINT16 See F22 in Section 5
+9 Event sequence number UINT16
+10-11 Event timestamp, seconds UINT32 Local time since Jan 1, 1970
+12-13 Event timestamp, seconds fraction, in microseconds UINT32
+14-15 Reserved UINT32 Written as 0
After receiving a write acknowledgement from a server, a TCP connection is still open for 10
seconds (20 seconds via GPRS) to give the server an opportunity to access meter registers
through an open socket. It may help you access the meter from outside your local
network when the server is located on another network, or when using wireless GPRS
communications. The notification client will respond to all server requests as if it were a regular
incoming connection.

17
If the server does not close a connection, it will be closed in 20 seconds if there is no activity on
the socket. In the event a connection attempt was unsuccessful, the notification client retries
two more times before announcing a connection failure.
The server’s IP address, port number and starting Modbus register address are programmable in
the meter. See “TCP Notification Client Setup” for more information on the client setup. To
configure and enable the notification client in your meter via PAS, select Communication Setup
in the Meter Setup menu, and click on the TCP Notification Client Setup tab.
Client connections are triggered via programmable setpoints. To send event notifications to a
server, configure a setpoint to respond to desired triggers or to periodic time events and add
the "Send notification" action to the end of the setpoint actions list.

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3 Modbus Register Map
3.1 Modbus Setup Registers
Address Point ID Description Options/Range Units Type R/W Notes
Modbus Assignable Registers
0-119
+0 Register 0 contents 0-65535 UINT16 R/W
+1 Register 1 contents 0-65535 UINT16 R/W
...
+119 Register 119 contents 0-65535 UINT16 R/W
Assignable Registers Map
120-239
+0 Mapped register 0 address 0-65535 UINT16 R/W
+1 Mapped register 1 address 0-65535 UINT16 R/W
+119 Mapped register 119 address 0-65535 UINT16 R/W
Modbus Conversion Scales
240 Low raw scale 0 UINT16 R
241 High raw scale 9999 UINT16 R
Device Data Scales
242 Voltage scale, in secondary volts 60-828 (default 144V) 1V UINT16 R/W
243 Current scale, in secondary amps = CT secondary
current (1A, 5A) ×Current overload 20, 100 (2.0A, 10.0A) ×0.1A UINT16 R

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3.2 16-bit Scaled Analog Registers and Energy Counters - Basic Register Set
Address Point ID Description Low and High Scales2Units2Type R/W Notes
256-308
+0 0x1100 V1/V12 Voltage 0-Vmax U1 UINT16 R 1
+1 0x1101 V2/V23 Voltage 0-Vmax U1 UINT16 R 1
+2 0x1102 V3/V31 Voltage 0-Vmax U1 UINT16 R 1
+3 0x1103 I1 Current 0-Imax U2 UINT16 R
+4 0x1104 I2 Current 0-Imax U2 UINT16 R
+5 0x1105 I3 Current 0-Imax U2 UINT16 R
+6 0x1106 kW L1 -Pmax-Pmax U3 INT16 R
+7 0x1107 kW L2 -Pmax-Pmax U3 INT16 R
+8 0x1108 kW L3 -Pmax-Pmax U3 INT16 R
+9 0x1109 kvar L1 -Pmax-Pmax U3 INT16 R
+10 0x110A kvar L2 -Pmax-Pmax U3 INT16 R
+11 0x110B kvar L3 -Pmax-Pmax U3 INT16 R
+12 0x110C kVA L1 -Pmax-Pmax U3 UINT16 R
+13 0x110D kVA L2 -Pmax-Pmax U3 UINT16 R
+14 0x110E kVA L3 -Pmax-Pmax U3 UINT16 R
+15 0x110F Power factor L1 -1.000-1.000 0.001 INT16 R
+16 0x1110 Power factor L2 -1.000-1.000 0.001 INT16 R
+17 0x1111 Power factor L3 -1.000-1.000 0.001 INT16 R
+18 0x1403 Total PF -1.000-1.000 0.001 INT16 R
+19 0x1400 Total kW -Pmax-Pmax U3 INT16 R
+20 0x1401 Total kvar -Pmax-Pmax U3 INT16 R
+21 0x1402 Total kVA -Pmax-Pmax U3 UINT16 R
+22 0x1501 In (neutral) Current 0-Imax U2 UINT16 R
+23 0x1502 Frequency 45.00-65.00 0.01Hz UINT16 R
+24 0x3709 Maximum kW import sliding window demand -Pmax-Pmax U3 UINT16 R
+25 0x160F kW import accumulated demand -Pmax-Pmax U3 UINT16 R
+26 0x370B Maximum kVA sliding window demand -Pmax-Pmax U3 UINT16 R
+27 0x1611 kVA accumulated demand -Pmax-Pmax U3 UINT16 R
+28 0x3703 I1 Maximum ampere demand 0-Imax U2 UINT16 R
+29 0x3704 I2 Maximum ampere demand 0-Imax U2 UINT16 R
+30 0x3705 I3 Maximum ampere demand 0-Imax U2 UINT16 R
+31 kWh import (low) 0-9999 1kWh UINT16 R 5
+32 kWh import (high) 0-9999 ×10MWh UINT16 R 5
+33 kWh export (low) 0-9999 1kWh UINT16 R 5
+34 kWh export (high) 0-9999 ×10MWh UINT16 R 5
+35 +kvarh net (low) 0-9999 1kvarh UINT16 R 3, 5
+36 +kvarh net (high) 0-9999 ×10Mvarh UINT16 R 3, 5
+37 -kvarh net (low) 0-9999 1kvarh UINT16 R 4, 5
+38 -kvarh net (high) 0-9999 ×10Mvarh UINT16 R 4, 5

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Address Point ID Description Low and High Scales2Units2Type R/W Notes
+39 0x1112 V1/V12 Voltage THD 0-999.9 0.1% UINT16 R 1 3-sec value
+40 0x1113 V2/V23 Voltage THD 0-999.9 0.1% UINT16 R 1 3-sec value
+41 0x1114 V3/V31 Voltage THD 0-999.9 0.1% UINT16 R 1 3-sec value
+42 0x1115 I1 Current THD 0-999.9 0.1% UINT16 R 3-sec value
+43 0x1116 I2 Current THD 0-999.9 0.1% UINT16 R 3-sec value
+44 0x1117 I3 Current THD 0-999.9 0.1% UINT16 R 3-sec value
+45 kVAh (low) 0-9999 1kVAh UINT16 R 5
+46 kVAh (high) 0-9999 10MVAh UINT16 R 5
+47 0x1609 Present kW import sliding window demand -Pmax-Pmax U3 UINT16 R
+48 0x160B Present kVA sliding window demand -Pmax-Pmax U3 UINT16 R
+49 0x1615 PF (import) at Max. kVA sliding window demand 0-1.000 0.001 UINT16 R
+50 0x111B I1 Current TDD 0-100.0 0.1% UINT16 R 3-sec value
+51 0x111C I2 Current TDD 0-100.0 0.1% UINT16 R 3-sec value
+52 0x111D I3 Current TDD 0-100.0 0.1% UINT16 R 3-sec value
NOTES:
Energy and Power demand readings are only available in the meters with suffixes E and EH.
1 Voltage and Voltage Harmonics Readings:
When the 4LN3, 3LN3 or 3BLN3 wiring mode is selected, the voltages will be line-to-neutral; for any other wiring mode, they will be line-to-line voltages.
When the 4LN3, 4LL3, 3LN3, 3LL3, 3BLN3 or 3BLL3 wiring mode is selected, the voltage harmonics will be line-to-neutral; for any other wiring mode, they will be line-to-line.
2All analog registers except of harmonics are 1-second average values. For volts, amps and power scales and units, refer to Section 4 ”Data Scales and Units”. For analog data scaling
formulas and examples, see Section 2.6.1, “16-bit Scaled Integer Format”.
3Positive readings of kvarh net
4Negative readings of kvarh net
5If you use these energy registers instead of 32-bit registers, limit the energy roll value to 8 digits (see Device Options Setup) to avoid overflow.