Modbus Extensions, Function Code Description | GE EPM 9650/9800

In the following example, a Master Device requests an EPM Slave at address 01H to transmit the value at Register 00256. The Slave replies with an error, indicating that it is busy.

Table 1.6: Exception Response Example
Master Packet		Slave Packet
Meaning	Hex	Meaning	Hex
Address	01H	Address	01H
Function Code	03H	Function Code	83H
Data Starting Address-Hi	01H	Error Code	06H
Data Starting Address-Lo	00H	CRC-Lo	C1H
Number of Registers-Hi	00H	CRC-Hi	32H
Number of Registers-Lo	01H
CRC-Lo	85H
CRC-Hi	F6H

1.8: Modbus Extensions

Modbus Read Requests have a maximum size when using standard Modbus function. GE devel- oped Enhanced (Non-Standard) Modbus Read Requests to allow larger than standard responses. This requires fewer requests and, is therefore, more efficient and total download time is reduced.

This function is also more efficient with Log Retrieval. It allows the Network Card to have DNP communication with the main unit utilizing a Modbus connection.

The following are non-standard extensions to the Modbus Protocol. EPM devices support the following additional Modbus Function Codes:

			Modbus Extensions
	Function Code		Description
	Hex	Dec	Description
	Hex	Dec
	23H	35	Read Holding Registers Multiple Times
	42H	66	Encapsulated DNP for LAN/WAN

1-6

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GE EPM 9650/9800 manual Modbus Extensions, Function Code Description

Contents

EPM 9650/9800 Meters Page EPM 9650/9800 Meters Modbus Protocol & Register Map Limitation of Warranty Customer Service and SupportProduct Warranty Statement of Calibration Table of Contents Page Page Page Communication Data Formats Page Modbus Register Map Notes Logs, Port Control and Updating Programmable SettingsEPM Programmable Settings Blocks EPM Log Formats Register Block Titles with Descriptions Page Xii Appendix a Glossary Xiv Communication Packets IntroductionSlave Address and Broadcast Request Function Code Description Hex Dec Function CodesFunction Codes Function Code 03-Read Holding Registers Function Code 6 Example Master Packet Slave Packet Function Code 06-Preset Single RegisterFunction Code 10-Preset Multiple Registers Data Starting Address CRC Error Checksum Algorithm Function Code 10 Example Master Packet Slave Packet Exception Response Error Codes Dead Time Modbus Extensions Modbus ExtensionsFunction Code Description Function Code Function Code 23H Read Holding Registers Multiple TimesRepeat Count RTU Framing Ascii Framing Function Code 42H Encapsulated DNP for LAN/WAN Function Code 23H Example Response Link Status Error CodeAddress Client IP Request PDU Response PDU Field Name Hex DNP Field Response PDU Page Chapter EPM Modbus Register Map Page DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP VAH DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP 02771 232 Limit States, Value Comparisons 02772 16-31 VAH DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP Time of Use Current Month Label Block DNP DNP DNP F12 KYZ Output Accumulation Block Analog Input Modules Data States F19 F57 DNP DNP DNP DNP DNP DNP DNP DNP DNP Reset Active TOU Time Stamp DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP Digital Output Snapshot Log Header DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP DNP Custom DNP Definition Block for Analog Input Object 47369-47424 Point 1 Point DNP DNP DNP DNP DNP DNP DNP Customizable Modbus Map Settings Block DNP LAN/WAN DNP DNP DNP DNP DNP DNP DNP Fixed Length String Enumeration DNP Bytes Type F1 Null Terminated Ascii StringType F2 Fixed Length Ascii String Register String Unit Type F3 Time StampDate Type F5 Secondary 1 Cycle RMS Voltage or Current Type F4 Day of WeekDay of Week Byte unsigned integer Decimal Byte unsigned integer HexSecondary Type F6 High Speed Input Delta and Current State VAR secondary Byte signed integer HexMost significant bit Byte integer Decimal Most significant bit Compliment Address Value 0390H Decimal Type F8 Power FactorQuadrant Value Hex Dec Address Value 0C10H Decimal Most significant bit Type F9 AngleAngle Type F10 Percentage Type F12 Energy Counter Binary / Secondary Type F11 Energy Counter Packed BCD / SecondaryNibbles Digit Unit VAh Byte unsigned integer Type F13 Phase SequenceType F14 Average Status Value Hex Bits Points Limit Passed Type F15 Limit StatesInterpretation Bits Type F16 Low Speed Input StatesByte Input Type F17 External Digital Input States Type F19 Energy Counter Packed BCD / Primary Type F18 External Input AccumulationsAccumulated Transitions Type F20 Energy Counter Binary / Primary Nibbles Digit Unit Type F21 Year Type F22 TOU Profile per Day Day Leap Year Type F23 TOU Profile StatusDay Address35107 Value0001H Decimal1 Nibbles Type F24 TOU Daily Profile Register AssignmentValue Hex Register Period Decimal Month Type F26 TOU Calendar DST Enable / Average SelectionType F25 TOU Profile Monthly End Day Selection Average Type F27 TOU Upload Calendar Window Sequence / StatusDecimal Purpose Type F29 TOU Upload Calendar Window Data Type F28 TOU Upload Calendar Window IDAddress36609 Value0DH Decimal13 Meaning Window Type F31 TOU Calendar Selection Type F30 TOU Upload Calendar Window ChecksumType F32 TOU Calendar Header Status / Year Status Most significant bit Decimal Type F33 TemperatureCelsius Type F34 Limit and Relay Logic States Type F35 Relay DelaysBits Limit Logic T/F Type F36 Desired Relay States Type F37 Relays Pending UpdateBits Limit State NO/NC Type F38 Shadowed Relay States Update?Bits Point Type F39 Confirmed Polled Relay States Type F40 Valid Flags for Confirmed Relay States Type F41 Locked Relays, Relays Locked? Type F42 Locked Relay States Bits Point Relay Bit Point Type F43 Miscellaneous FlagsAddr Type F44 Digital Input Module Data Status Bits Point Digital Input Reg Bit Point Type F45 Analog Input Modules Data StatusBits Point Analog Input Module Status Type F4 Low Byte of Modbus Register Signed Type F46 High Byte of Modbus Register SignedType F47 High Byte of Modbus Register Unsigned Type F49 Low Byte of Modbus Register Unsigned Type F52 Four-Byte Signed Type F50 Two-Byte SignedType F51 Two-Byte Unsigned Type F53 Four-Byte Unsigned Type F54 Eight-Byte Signed Type F55 Eight-Byte Unsigned Type F57 Accumulation in the Interval Type F56 Flicker CountdownsType F58 12-bit RTU Sanity Register 0400H Type F59 12-bit RTU Current, Voltage, W, VARAddr 53250 Addr 53256 Digit Unit KWh primary Type F60 Energy CounterType F61 12-bit RTU Frequency 0810H Most Significan Bit Type F62 Scaled Pulse Accumulation, Aggregation or AverageByte Signed Integer Addr Hex Type F64 Scaled Energy Type F63 Log IndexByte Hex Type F65 Scaled Energy Setting Bit Meaning Type 66 TOU Upload Calendar Window Locked to Port Type 67 K-Factor Factor Chapter Modbus Register Map Notes Modbus Register Map NotesPage Downloading Logs Overview Byte RangePage Steps for Downloading a Log Downloading Time Stamps with Examples Address Description Example ValuePage Downloading Records with Examples Page Downloading Logs with Auto Index and Modbus Extensions Auto Increment Window Index 0x099FF Download using Auto Increment Window SequenceAuto Increment Log Window 0x09A3F Port Locking Overview Reception Sequence for Port LockingTransmission Port Unlocking Sequence Updating Programmable Settings Overview Sequence for Updating Programmable Settings Clear on New Period / Freeze Period Selection Modifications to Time of UseRegister Meaning Value Weekly Freeze Day of Week / Freeze Hour Calibration Interface Manual Adjustment InterfaceModbus Register Dual Port Address Name Decimal Hex Page Direct Adjustment Interface As Stored LSB Decimal Scaled Change by Multiply byDecimal Scaled Meaning Change by Modified by Chapter EPM Log Formats Log Formats Overview Historical Log 1 Record Size Profile Information is in the Programmable Settings BlockHistorical Log 1 Format Historical Log 1 Data Pointers Historical Log 2 Format Profile Information is in the Programming Settings BlockFormat Range Description Historical Log 2 Record Size Historical Log 2 Data Pointers Limit Trigger Log Format Limit Snapshot Log Format Format Range Description Waveform Trigger Log Format VAN, VBN, VCN, IA, IB, IC, IAUX, VAB, VBC, VCA High Speed Digital Input States Above Limits VAN VBN VCN Vaux IA IB IC Iaux Example for EPM 9650 with regular hardware or EPM Formula to use for EPM 9650s with 300V hardware isExample for EPM 9650 with 300V hardware Waveform Samples Log Format Page HS RMS Page Current Sample Examples Actual 1st Byte 2nd Byte Straight Current Sample Examples Actual 1st Byte Straight 2nd Byte Current Sample Examples Actual Ist Byte Straight 2nd Byte High Speed Digital Input States Power Quality Cbema Log Format VAN VBN VCN Vaux IA IB IC Iaux VAB VBC VCA 11 High Speed Digital Input States Digital Input Log Format Byte Format Range 13 States of the Internal Digital Inputs Digital Input Snapshot Data Pointers Digital Input Snapshot Log FormatFormat Range Page Digital Output Log Format 16 Relay Valid Bits 18 Relay Logic Gate Ouputs Page Digital Output Snapshot Log Format Digital Output Snapshot Data Pointers Byte Format Range Description Flicker Log Format System Event Log Format Power Record Password Record Change Firmware Change Programmable SettingsChange Time Test Mode Log Download Feature Reset Limit Settings Block Communication Settings BlockCommunication Settings Block Specifications Structure for a combination is Structure for the Direction and Combination byte is Data Pointer 4-Byte Structure Historical Log Settings BlockPollable information would consist Format Description Set Points Waveform/CBEMA Settings BlockWaveform & PQ enable Sample Rate External Digital Input Module Settings Block High Speed Inputs Settings BlockExternal Digital Output Module Settings Block External KYZ Output Module Settings Block External Analog Input Module Settings BlockExternal Analog Output Module Settings Block KYZ Output Relay Byte Energy Assignments 11 CT & PT Ratio Settings Block Hookup and Time Settings Block Average Settings Block Exception Profile Block Network Settings Block Device Label Settings BlockPort 2 Baud Rate Values Mode 2 Network Mode 2 byte Server / Service Enable Energy Direction Block Display Configuration BlockBlock Window Average External Synchronization Block Proper Values for BWA Synch Mask Assigned Inputs Full Scale Block Test Mode Configuration BlockExternal Module Software Interface Block External Module Port Assignments External Module Port Assignment BlockManual Control Relay Block Value Assignments Internal Input Pulse Accumulation Scale Factor Block Internal KYZ Settings Block 46330-46372- EPM 9800 Only26 I2t and V2t Threshold Block Internal KYZ Channel Assignment Internal KYZ Enable Assignment BitChannel Assignment Internal Input Pulse Accumulation Unit Label Block End of Interval Pulse Byte Value EnableWidth milliseconds ElectroLogic Block Format of a Relay Structure Value Update External Analog Output Module Channel Update BlockExternal Analog Output Module Update Speed Structure for the Direction and Combination byte Bytes to be Sent Out Miscellaneous DNP Settings BlockValue Time 1 Minute Interval DNP Freeze Date & Time 4 registers, 8 bytes Registers Byte Name Range Custom DNP Definition Block for Analog Input Object 30 Custom DNP Definition Block for Binary Counter Object 20 Class Assignments for Counter Change Event Bit Custom DNP Definition Block for Binary Input Object 1 Bit ResetsCustom DNP Definition Block for Binary Output Object 10 Analog Input Labels Block Custom DNP Definition Block for Global ValuesAnalog Input Scaling Factors Block External Digital Input Module Labels Block Index Baud Rate INP Internal Modem Card Settings BlockEPM Internal Modem Card Baud Rate Settings Bit 2 Bit Parity Internal Modem Card Bitmap Settings Numeric Pager ID 7 bytes Reserved for future use Modem Feature Dial-Out Mask Event Mask Bit Event Description Customizable Modbus Map Settings Block Email Mode Bitmap Enable / Disable 1 RegisterEmail Client Settings Network Settings 10/100 Card Connection Type/Option Bits FTP Client Network Settings 10/100 CardGE EGD Protocol Network Settings 10/100 Card DNP LAN/WAN Validate Connection Count 1 byte unsigned integer DNP LAN/WAN Bitmap Customizable Modbus Map Format Block Energy Scale SettingsLine Number 2 bytes Point Number 1 byte Update Settings Block Page On Time Device Indentification BlockReal Time Block Current Time Tenth Second Block 1 Cycle BlockOne Second Block Minimum Block Thermal Average BlockMaximum Block Maximum Time Stamp Block Harmonic Magnitude Block Harmonic Phase BlockPhase Angle Block 14 THD/K-Factor Block Time of Use Period Time Stamp Block Digital Input BlockPrimary Accumulation Block Time of Use Frozen Block Time of Use Active Register Block Time of Use Prior Month Register BlockTime of Use Prior Month Total Block Time of Use Active Total Block Time of Use Frozen Label Block TemperatureTime of Use Current Month Total Block Time of Use Prior Month Label Block Limit Combination Block Reset Time BlockAnalog Input Block Relay Logic Block Input Module Data Status Block Test Mode BlockKYZ Output Accumulation Block Flicker Status Block Cumulative Demand Block Energy and Pulses in the Interval BlockFlicker Countdown Block Time of Use Active Cumulative Demand Block TOU Current Month Continuous Cumulative Demand Block Total Average Power Factor BlockTOU Active Continuous Cumulative Demand Block Log Index Block Enhanced Programmable Settings Block Reset Active Time of Use Time StampEnhanced Factory Settings Block Negative Maximum Pulse Aggregation Average Block Time of Use Upload Calendar Block Time of Use Calendar BlockHistorical Log 1 Snapshot Header Limit Snapshot Log Header Historical Log 2 Snapshot HeaderLimit Trigger Log Header Digital Input Log Header System Event Log Header Flicker Log HeaderWaveform Trigger Log Header Valid Bitmap Undefined PQ Cbema Log Header Reset Log HeaderWaveform Samples Log Header External Device Information Block Header Device History Block Header Direct Memory Access HeaderWindow Index Block Page Window Mode Block Page Window Block Page Auto Increment Window Block „ Auto Increment Configuration 1 Register, 2 bytes„ Auto Increment Window Index 1 register, 2 bytes „ Auto Increment Log Window 64 registers, 128 bytes Alarm BlockByte Format Range Description Last Alarm Snapshot Format Description Port Control Block Port Control Lock States Register High Byte Low Byte Receive and Transmit Buffers Port Transmit 97 12-bit RTU Block Energy Preset BlockCurrent, Voltage, W, VAR 1 register, 2 bytes Action Block Resetting EPM Registers Voltage Calibration Inputs Model Current Calibration Inputs Model Calibration Modification Block Factory Calibration BlockCtpt Compensation Calibration Block Relay Locking Action Selection Values ValueDescription Device Identification Block 2 Operational Communication Settings BlockDiagnostic Block Xilinx Version / 320 Xilinx Version Sealing Switch State DSP Diagnostic BlockPassword Block Firmware Variation Strings New Password a New Password B Nvram Configuration Values Dynamic Configuration BlockHardware Option Settings Hardware Options Block EPM Forms Code Banked Executable Option Settings Modbus Register 9650 9800CT’s PTs Amp 65364 High 300 V 65364 Low Flash Control Block Page Flash Locked Port GE Communicator EXT Flash Code Hex Line Enhanced Serial Number Serial NumberPage Glossary Eeprom LCD Nvram Glossary-5 THD