Satec PM172 Series User manual

SERIES PM172 POWERMETERS

COMMUNICATIONS

DNP3-2000 Communications Protocol

REFERENCE GUIDE

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.

This book is copyrighted. No part of this book may be reproduced, stored in a retrieval system, or

transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise

without the prior written permission of the manufacturer.

Rev.A7 (F/W Version 4.88.8 or later):

1. Added DNP 16-bit BC scaling option.

Rev.A6 (F/W Version 4.88.3 or later):

2. Added DNP Binary Output Object 10 Variation 01 (packed bit read).

3. Added DNP points BC:4, BC:5 for kvarh imp/exp energy counters.

Rev.A5 (F/W Version 4.88.2 or later):

1. Added the Broken Delta wiring configuration.

2. Communication protocol is changeable through communications.

3. DNP event setpoints are configurable for High and Low thresholds and Delta triggers.

4. Removed DNP Class 0 group assignments.

5. The battery status is reported in the device self-check register.

Rev.A4 (F/W Version 4.86 or later):

1. Added DNP Class 0 point assignments.

2. Separated the DNP Class 0 assignment and DNP Events setup.

3. Control Relay Output Block point #100 allows assigning Relay status Points to the Class 0 polling.

4. The Frozen Counter points have the same numbers as the corresponding Binary Counters.

BG0273 Rev. A7

Table of Contents

GENERAL........................................................................................................................... 4

DNP PROTOCOL ............................................................................................................... 5

Introduction....................................................................................................................... 5

PM172 Deviation from Standard ...................................................................................... 5

DNP Implementation ........................................................................................................ 5

Scaling 16-bit Analog Inputs............................................................................................. 6

Scaling 16-bit Binary Counters......................................................................................... 7

PM172 REGISTERS ........................................................................................................... 8

Basic Data Registers ........................................................................................................ 8

Basic Setup Registers ...................................................................................................... 9

User Selectable Options Setup ...................................................................................... 10

Firmware Version and Device Options........................................................................... 10

Communications Setup .................................................................................................. 11

DNP Options Setup ........................................................................................................ 12

DNP Event Definition Registers ..................................................................................... 13

Freeze Requests on Binary Counter Objects................................................................. 14

Resetting Energy, Demands, Counters and Min/Max log .............................................. 15

Status Registers ............................................................................................................. 16

Alarm Status Registers................................................................................................... 16

Extended Data Registers ............................................................................................... 17

Analog Output Setup ...................................................................................................... 22

Analog Expander Channels Allocation Registers .......................................................... 23

Digital Inputs Allocation Registers.................................................................................. 24

Pulsing Setpoints Registers ........................................................................................... 24

Relay Operation Control................................................................................................. 25

Pulse Counter Setup ...................................................................................................... 26

Class 0 Point Assignment .............................................................................................. 26

APPENDIX A DNP APPLICATION MESSAGES............................................................ 28

APPENDIX B DNP DEVICE PROFILE............................................................................ 30

1 GENERAL

GENERAL

This document specifies a subset of the DNP3-1999 serial communications protocol used to transfer data

between a master computer station and the Series PM172 Powermeters.The document provides all necessary

information for developing third-party communications software capable of communicating with the PM172.

Additional information concerning communications operation, configuration of communications parameters, and

communications connections is found in the Series PM172 Installation and Operation Manual.

IMPORTANT

1. The voltage parameters throughout the protocol can represent line-to-neutral or line-to-line voltages

depending on the wiring mode selected in the instrument. 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. In

4LN3, 4LL3, 3LN3, 3LL3, 3BLN3 and 3BLL3 wiring modes, harmonic voltages will represent line-to-neutral

voltages. In a 3-wire direct connection, harmonic voltages will represent line-to-neutral voltages as they

appear on the instrument's input transformers. In a 3-wire open delta connection, harmonic voltages will

comprise L12 and L23 line-to-line voltages.

2. In 3-wire connection schemes, the unbalanced current and phase readings for power factor, active power,

and reactive power will be zero, because they have no meaning. Only the total three-phase power values can

be used.

3. Most of the instrument’s advanced features are configured using multiple setup parameters that can be

accessed in 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.

Each written value is checked for compatibility with the other setup parameters, and if the new value does not

conform to them, the request will be rejected.

2 DNP PROTOCOL

DNP PROTOCOL

Introduction

DNP3-2000 (Distributed Network Protocol) is an open standard designed by Harris Control Division. DNP defines

a command-response method of communicating digital information between a master and slave device. Detailed

information regarding DNP3-2000is available in the “Basic 4 Document Set” which can be obtained from the DNP

User Group. This document describes a LEVEL 2 DNP3-2000 communication protocol implemented between a

master station and a slave PM172 instrument.

PM172 Deviation from Standard

The PM172 does not support unsolicited requests or hardware collision avoidance.

The data link layer differs from the Basic 4 specifications because of the master-slave relationship between

devices. When the Powermeter receives a request, no further requests can be sent until after the Powermeter

makes the appropriate response.

DNP Implementation

Overview

The PM172, like most devices, retrieves regular analog and binary data from the instrument by executing directed

(non-broadcast) Read requests.

Binary-Output-Status objects and Analog-Output-Status objects are sent with flags that always indicate ONLINE.

A Binary-Output-Status object that indicates the current state of a control digital point (relay) uses remote forced

data as well as local forced data bits. The value of a state bit indicates the current state of the digital output point.

The PM172 executes the parameter clear function and demands resets using the Direct-Operate (or SBO/Operate

or Direct-Operate-No-Acknowledge) command to specified points of the Control-Relay-Output-Block object.

Issuing the Direct-Operate (or SBO/Operate or Direct-Operate-No-Acknowledge) command to appropriative points

of the Analog-Output-Block object can change the setup parameters. The DNP functions Write, Cold-Restart and

Delay Measurement are also supported by the PM172. Refer to Appendix A for specific requests and responses.

Appendix B contains the standard DNP Device Profile Document.

The Powermeter attempts to respond with the same object variation and qualifier as those in the request.

Exceptions to this rule include changing variation 0 to a specific variation and changing qualifier code 6 to 1.

If the Powermeter receives an invalid request, it sets the internal indication to the error code. The following

internal indication bits are supported:

Octet

Position

Bit

Position

Description

0 0 Set when a request received with a broadcast destination address. Cleared after next

response.

0 7 Device restart - set when the instrument powers up or after executing Cold Restart, cleared

by writing zero to object 80.

0 4 Time-synchronization required from the master. Cleared when master sets the time.

0 5 Set when the instrument is in the Local state(is being programmed via the front panel).

Cleared when the instrument is in the Remote state.

1 5 Set when the current configuration in the instrument is corrupted. May also be set as a result

of the legal changes in the setup configuration whenever another setup is affected by the

changes made. Cleared when either setup is reloaded.

Class 0 Response

The PM172 DNP implementation supports a wide variety of messages. The most common method to extract DNP

static object information is to issue a Read Class-0 request.

There is an option for assigning objects to be polled via Class 0 requests. When this option is used, the Class 0

response includes all static object points specified by the Class 0 Point Assignment Setup Registers (see Table 3-

30). By default, the following points are specified by the Class 0 Point Assignment setup: 32 first Analog Input

points from Table 3-1, 3 Analog Output first 3 points from Table 3-2, 2 Binary Input points represented Status

Inputs and 2 Binary Input points represented Relay Status (see Table 3-13).

Object Point Mapping and Event Objects

The PM172 has a special mapping mechanism allowing you to map either static object point onto predefined point

range. A total of 32 points are available for mapping. DNP static objects can be accessed directly by using the

dedicated object point number. DNP event objects can be generated and accessed only through a mapping

mechanism.

You can map any of the 32 mapping points to either Analog Input, Binary Input or Binary Counter object point. By

default those are factory mapped to the first 32 points of the Analog Input object: 32 points from the Basic Data

Registers (see Table 3-1). To re-map these, you must define the required number of points for each allowable

DNP object in the DNP Options Setup (see Table 3-8), and then configure each point individually to be polled as

an event source, via the DNP Event Setpoints Setup (see Table 3-9). For any mapped static object point, you can

enable a corresponding event object point. Note that any changes made to the DNP Options Setup cause a reset

of the DNP Event Options Setup points to their defaults.

All event options are disabled by default. Since a mapped static point is configured to create DNP Event objects,

events are generated for this point as its value or state changes. Two different scan time rates are used for polling

events:

- 200 ms for Binary Counter and Analog Input points;

- 50 ms for Binary Input points.

The memory consumption for keeping events depends on the event objects variation (DNP object size). The

maximum buffer size (MBS) per DNP Event Object/ Event Class is 256 byte. The maximum number of events that

the instrument can hold can be calculated as follows:

Maximum Events Number = MBS / (DNP Event Object Size + 1)

For example, the instrument can hold up to 21 measures of the 32-bit Analog Change Event With Time Object:

(256 / 12) or up to 32 measures of the 8-bit Binary Change Event With Time Object: (256 / 8).

To suppress mapping, explicitly set all registers that specify the number of the Analog Input, Binary Input and/or

Binary Counter objects to 0. In this case PM172 supports Static Operation Polling only.

DNP Address

The instrument on a DNP link must have a unique address. The PM172 allows one of 256 addresses to be

selected. The selectable addresses have a range of 0-255. DNP uses the address 65535 for broadcast function.

Note that a broadcast request never generates a DNP response.

Transaction Timing

To allow the master to switch the communication link, the Powermeter minimum response time must be at least

3.5 character time (depending on the baud rate) and at least 5 ms. Table 2-1 shows the actual response time

measured at 9600 bps.

Table 2-1 Response Time

No. of Parameters Typical response time, ms Maximum response time, ms

1 10 12

5 15 16

10 21 22

43 (Object 30:3) 45 62

Note that Direct-Operate (or SBO/Operate or Direct-Operate-No-Acknowledge) requests for reset/clear registers

and setpoint changing are immediately confirmed.

Scaling 16-bit Analog Inputs

With the Analog-Input objects, any of variations 1 through 4 can be used. Variations specified in the tables in

Section 3 show those that should be used to read a full-range value without a possible over-range error when no

scaling is used to accommodate the value to the requested object size.

When over-range occurs, a positive value is reported as 32767 and a negative value as -32768, with the over-

range bit being set to 1 in the flag octet if a variation 2 is requested. To avoid over-range errors when a variation 2

or 4 is required, a liner scaling may be used (see Section 3, DNP Options Setup) to scale 32-bit analog readings

to 16-bit Analog Input objects. By default, scaling is disabled.

When scaling is enabled, either analog input requested with variation 2 or 4 will be scaled to the range of -32768

to 32767 for bi-directional parameters (such as power and power factor), and to the range of 0 to 32767 for single-

ended positive parameters (voltage, current, frequency, etc.). To get a true reading, the reverse conversion should

be done using the following formula:

Y = ((X – DNP_LO) ×(HI - LO)) /(DNP_HI – DNP_LO) + LO

where:

Y - the true reading in engineering units

X - the raw input data in the range of DNP_LO – DNP_HI

LO, HI - the data low and high scales in engineering units (specified for each Analog-Input point, Section 4)

DNP_LO - DNP low conversion scale: DNP_LO = -32768 for a point with a negative LO scale, DNP_LO = 0 for

a point with a zero or positive LO scale

DNP_HI - DNP high conversion scale: DNP_HI = 32767

EXAMPLE

Suppose you have read a value of 201 for point 3 that reports a current reading (see Table 3-1). If your instrument

has CT primary current 5000 A, then the current high scale is HI = 2.0×5000 = 10000, and the current reading in

engineering units will be as follows:

(201 - 0) ×(10000 - 0)/(32767 - 0) + 0 = 61.34A

Scaling 16-bit Binary Counters

Binary counters are stored in the device in 32-bit integer format. Using 16-bit Binary Counter objects can cause

over-range errors if the counter value exceeds 32767. Scaling binary counters (see DNP Options setup in Section

3.9) allows changing a binary counter unit from 1 to 1000 in powers of 10 to accommodate a 32-bit counter value

to 16-bit object format. If the scaling unit is greater than 1, the counter value is reported being divided by the

scaling unit. To get the actual value, multiply the counter reading by the selected scaling unit.

3 PM172 Registers

PM172 Registers

Basic Data Registers

These registers are used to retrieve a predefined set of the data measured by the Powermeter. All electrical

parameters are averaged values over the specified number of real-time measurements.

Table 3-1 Basic Data

Object:Var 5Parameter Object:Point Unit

2Value range

30:3 Voltage L1/L12

4AI:0 V 0 to Vmax

30:3 Voltage L2/L23

4AI:1 V 0 to Vmax

30:3 Voltage L3/L31

4AI:2 V 0 to Vmax

30:3 Current L1 AI:3 A 0 to Imax

30:3 Current L2 AI:4 A 0 to Imax

30:3 Current L3 AI:5 A 0 to Imax

30:3 kW L1 AI:6 kW -Pmax to Pmax

30:3 kW L2 AI:7 kW -Pmax to Pmax

30:3 kW L3 AI:8 kW -Pmax to Pmax

30:3 kvar L1 AI:9 kvar -Pmax to Pmax

30:3 kvar L2 AI:10 kvar -Pmax to Pmax

30:3 kvar L3 AI:11 kvar -Pmax to Pmax

30:3 kVA L1 AI:12 kVA 0 to Pmax

30:3 kVA L2 AI:13 kVA 0 to Pmax

30:3 kVA L3 AI:14 kVA 0 to Pmax

30:4 Power factor L1 AI:15 0.001 -999 to 1000

30:4 Power factor L2 AI:16 0.001 -999 to 1000

30:4 Power factor L3 AI:17 0.001 -999 to 1000

30:4 Total Power factor AI:18 0.001 -999 to 1000

30:3 Total kW AI:19 kW -Pmax to Pmax

30:3 Total kvar AI:20 kvar -Pmax to Pmax

30:3 Total kVA AI:21 kVA 0 to Pmax

30:3 Neutral (unbalanced) current AI:22 A 0 to Imax

30:4 Frequency AI:23 0.01Hz 0 to 10000

30:3 Maximum sliding window kW demand 4(E) AI:24 kW 0 to Pmax

30:3 Accumulated kW demand (E) AI:25 kW 0 to Pmax

30:3 Maximum sliding window kVA demand 4(E) AI:26 kVA 0 to Pmax

30:3 Accumulated kVA demand (E) AI:27 kVA 0 to Pmax

30:3 Maximum ampere demand L1 AI:28 A 0 to Imax

30:3 Maximum ampere demand L2 AI:29 A 0 to Imax

30:3 Maximum ampere demand L3 AI:30 A 0 to Imax

30:3 Present sliding window kW demand 3(E) AI:31 kW 0 to Pmax

30:3 Present sliding window kVA demand 3(E) AI:32 kVA 0 to Pmax

30:4 PF import at maximum kVA sliding window

demand (E)

AI:33 0 to 1000

30:4 Voltage THD L1/L12 AI:34 % 0 to 9999

30:4 Voltage THD L2/L23 AI:35 % 0 to 9999

30:4 Voltage THD L3 AI:36 % 0 to 9999

30:4 Current THD L1 AI:37 % 0 to 9999

30:4 Current THD L2 AI:38 % 0 to 9999

30:4 Current THD L3 AI:39 % 0 to 9999

30:4 Current TDD L1 AI:40 % 0 to 1000

30:4 Current TDD L2 AI:41 % 0 to 1000

30:4 Current TDD L3 AI:42 % 0 to 1000

20:5 kWh import (E) BC:0 kWh 0 to 999,999,999

20:5 kWh export (E) BC:1 kWh 0 to 999,999,999

20:5 kvarh net (E) BC:2 kvarh -999,999,999 to 999,999,999

20:5 kVAh (E) BC:3 kVAh 0 to 999,999,999

Object:Var 5Parameter Object:Point Unit

2Value range

20:5 kvarh import (E) 6BC:4 kvarh 0 to 999,999,999

20:5 kvarh export (E) 6BC:5 kvarh 0 to 999,999,999

AI indicates Analog-Input point, BC - Binary Counter point.

1The parameter limits are as follows:

Imax (200% over-range) = 2 ×CT primary current [A]

Direct wiring (PT Ratio = 1):

Vmax (690 V input option) = 828.0 V

Vmax (120 V input option) = 144.0 V

Pmax = (Imax ×Vmax ×3) [kW x 0.001] if wiring mode is 4LN3, 3LN3 or 3BLN3

Pmax = (Imax ×Vmax ×2) [kW x 0.001] if wiring mode is 4LL3, 3OP2, 3DIR2, 3OP3, 3LL3 or 3BLL3

Wiring via PTs (PT Ratio > 1):

Vmax (690 V input option) = 144 ×PT Ratio [V]

Vmax (120 V input option) = 144 ×PT Ratio [V]

Pmax = (Imax ×Vmax ×3)/1000 [MW x 0.001] if wiring mode is 4LN3. 3LN3 or 3BLN3

Pmax = (Imax ×Vmax ×2)/1000 [MW x 0.001] if wiring mode is 4LL3, 3OP2, 3DIR2, 3OP3, 3LL3 or 3BLL3

2When using direct wiring (PT Ratio = 1), voltages are transmitted in 0.1 V units, currents in 0.01 A units, and powers in

0.001 kW/kvar/kVA units. For wiring via PT (PT Ratio > 1), voltages are transmitted in 1V units, currents in 0.01 A units,

and powers in 1 kW/kvar/kVA units.

3To get block interval demand readings, set the number of demand periods equal to 1 (see Table 3-4).

4When the 4LN3 or 3LN3 wiring mode is selected, the voltages will be line-to-neutral; for any other wiring mode, they will be

line-to-line voltages.

5Variations specified in the table show those that should be used to read a full-range value without a possible over-range

error when no scaling is used to accommodate the value to the requested object size (see Section 3, Scaling Analog Input

Objects).

6Available starting with F/W Version 4.88.3 or later.

E Available in the PM172E

Basic Setup Registers

These registers are used to access the basic setup parameters. In the event that the modulus field is not equal to

1, the value received from the Powermeter must be multiplied by the modulus. When written, such a number

should be divided by the modulus.

Table 3-2 Basic Setup Registers

Object:

Variation

Parameter Object:

Point

Range Comment

40:2 (read)

41:2 (write)

Wiring mode 1AO:0 0 = 3OP2, 1 = 4LN3, 2 = 3DIR2,

3 = 4LL3, 4 = 3OP3, 5 = 3LN3,

6 = 3LL3, 8 = 3BLN3, 9 = 3BLL3

40:1 (read)

41:1 (write)

PT ratio AO:1 10 to 65000 ×0.1

40:1 (read)

41:1 (write)

CT primary current AO:2 1 to 5000 A

40:2 (read)

41:2 (write)

Power demand period (E) AO:3 1,2,5,10,15,20,30,60 min

255 = external synchronization

40:2 (read)

41:2 (write)

Volt/ampere demand period AO:4 0 to 1800 sec

40:2 (read)

41:2 (write)

Averaging buffer size AO:5 8, 16, 32

40:2 (read)

41:2 (write)

Reset enable/disable AO:6 0 = disable, 1 = enable

40:1 (read) Reserved AO:7 Read as 65535

40:2 (read)

41:2 (write)

The number of demand periods (E) AO:8 1 – 15

40:1 (read) Reserved AO:9 Read as 65535

40:1 (read) Reserved AO:10 Read as 65535

40:2 (read)

41:2 (write)

Nominal frequency AO:11 50, 60 Hz

40:2 (read)

41:2 (write)

Maximum demand load current AO:12 0 to 10000 A (0 = CT primary current)

AO indicates Analog-Output-Status (Read) and Analog-Output-Block (Write) points.

1The wiring mode options are as follows:

3OP2 - 3-wire open delta using 2 CTs (2 element)

4LN3 - 4-wire WYE using 3 PTs (3 element), line-to-neutral voltage readings

3DIR2 - 3-wire direct connection using 2 CTs (2 element)

4LL3 - 4-wire WYE using 3 PTs (3 element), line-to-line voltage readings

3OP3 - 3-wire open delta using 3 CTs (2 1/2 element)

3LN3 - 4-wire WYE using 2 PTs (2 1/2 element), line-to-neutral voltage readings

3LL3 - 4-wire WYE using 2 PTs (2 1/2 element), line-to-line voltage readings

3BLN3 - 3-wire Broken Delta (2 1/2 element), line-to-neutral voltage readings

3BLL3 - 3-wire Broken Delta (2 1/2 element), line-to-line voltage readings

E Available in the PM172E

User Selectable Options Setup

Table 3-3 User Selectable Options Registers

Object:

Variation

Parameter Object:

Point

Range

40:2 (read)

41:2 (write)

Power calculation mode AO:92 0 = using reactive power,

1 = using non-active power

40:2 (read)

41:2 (write)

Energy roll value (E) AO:93 0 = 1×104

1 = 1×105

2 = 1×106

3 = 1×107

4 = 1×108

5 = 1×109

40:2 (read)

41:2 (write)

Phase energy calculation mode (E) AO:94 0 = disabled, 1 = enabled

40:2 (read)

41:2 (write)

Analog output option AO:95 0 = none, 1 = 0-20 mA,

2 = 4-20 mA, 3 = 0-1 mA

4 = ±1 mA

40:2 (read)

41:2 (write)

Analog expander output 1AO:96 0 = none, 1 = 0-20 mA,

2 = 4-20 mA, 3 = 0-1 mA

4 = ±1 mA

1Do not enable the analog expander output if the analog expander is not connected to the instrument, otherwise the

computer communications will become garbled.

E - Available in the PM172E (in the PM172P read as 65535)

Firmware Version and Device Options

The registers shown in Table 3-4 are used to retrieve the firmware version number and instrument options.

Table 3-4 Firmware and Instrument Options Registers

Object:

Variation

Parameter Object:

Point

Read/

Write

Range

30:4 Firmware build number 1AI:1023 Read 0-65535

30:4 Firmware version number AI:1024 Read 0-65535

30:3 Instrument option 1 AI:1025 Read See Table 3-5

30:3 Instrument option 2 AI:1026 Read See Table 3-5

30:4 Active serial port number AI:1027 Read 0 = COM1,

1 = COM2

AI indicates Analog-Input points. Scaling mechanism is not supported for these registers.

1Available starting with F/W Version 4.88.2 or later.

Table 3-5 Instrument Options

Point Bit number Description

Options 1 0 120V option

(AI:1025) 1 690V option

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