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GE DGP Instruction Manual

Digital generator protection relay
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NOTE
GE Power Management
215 Anderson Avenue, Markham, Ontario
Canada L6E 1B3
Tel: (905) 294-6222 Fax: (905) 294-8512
Internet: http://www.GEindustrial.com/pm
Digital Generator Protection Relay™
All relays must be powered up at least once per year
to avoid deterioration of electrolytic capacitors and
subsequent relay failure.
DGP
Instruction Manual
DGP Revisions: V210.12000P
V210.10000F
V211.32000J
V210.22000D
Manual P/N: GEK-100666D
Copyright © 2000 GE Power Management
GE Power Management
Manufactured under an
ISO9002 Registered system.

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Summary of Contents for GE DGP

  • Page 1 DGP Revisions: V210.12000P V210.10000F V211.32000J V210.22000D Manual P/N: GEK-100666D Copyright © 2000 GE Power Management All relays must be powered up at least once per year to avoid deterioration of electrolytic capacitors and NOTE subsequent relay failure. GE Power Management...
  • Page 2 These instructions do not purport to cover all details or variations in equipment nor provide for every possible contingency to be met in connection with installation, operation, or maintenance. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser’s purpose, the matter should be referred to the General Electric Company.
  • Page 3 5. To communicate with the relay from a PC, connect the relay to a serial port of an IBM compatible computer with a DGP null-modem cable. Connection can be made either to the 25 pin D-connector on the back of the relay (PL-1) or the 9 pin D-connector on the front (COM).

  • Page 4: Getting Started

    With Test Blocks Without Test Blocks Protocol GE Modem Protocol Modbus RTU Protcol (DGP***BCA only) Functions and Functions and Features – see DGP selection guide below. Features Revision DGP Revision A Firmware Table 1–2: DGP SELECTION GUIDE FUNCTIONS & FEATURES...

  • Page 5: Special Models

    1.1.4 DEC 1000 CONTACT EXPANSION UNIT The DEC 1000 is a relay expansion unit for the DGP consisting of five form C relays and six form A relays. These contacts can be used for signalling or alarm purposes. Any protection function available in the compan- ion DGP relay can be selected for DEC output relay assignment.

  • Page 6: Chapter 2: Calculation Of Settings

    SELECTION GUIDE in the previous section to determine functions included in a specific model. 1.2.2 APPLICATION The DGP system is designed to be used on hydroelectric, gas, and steam generating units. Any size of gener- ator can be protected with this digital system.
  • Page 7 DOR 9 SPARE PRINTER DEC1000 SELF TEST Contact Expansion 74 NC Unit CRITICAL IRIG-B (REAR) SELF-TEST 74 CR CRITICAL POWER SUPPLY ALARM 1 POWER SUPPLY ALARM 2 704753A7.CDR Figure 1–1: TYPICAL WIRING DIAGRAM GE Power Management DGP Digital Generator Protection System...
  • Page 8 1.3 PROTECTION FEATURES 1 PRODUCT DESCRIPTION 1.3 PROTECTION FEATURES 1.3.1 DESCRIPTION The following protection functions are included with the DGP system. Table 1–3: DGP PROTECTION FUNCTIONS PROTECTION FUNCTION ANSI CODE(S) Stator Differential Current Unbalance Loss of Excitation Anti-Motoring Time Overcurrent with Voltage Restraint...

  • Page 9: Loss Of Excitation

    In addition to 46T, the DGP system also includes a current-unbalance alarm function, 46A, which is operated by the negative-sequence component (I2) with an adjustable pickup and time delay.
  • Page 10 For a specific application, the minimum motoring power of the generator should be obtained from the supplier of the unit. The DGP system includes a reverse power function with adjustable time-delay. Either one or two (32-1 & 32-2) independent setpoints are incorporated depending on the model number.

  • Page 11: Protection Features

    VN3 voltage conditions, this function can be inhibited by a settable window of forward power. How- ever, it should be noted that other conditions influencing the VN3 voltage may make 27TN insecure. In these cases, function 64G2 (available in some models; see the DGP nomenclature guide) or some other means should be considered.
  • Page 12 Functions 40 and 51V may operate for a full or partial loss of AC potential caused by one or more blown fuses. The DGP makes provisions to block tripping by these functions when a fuse failure is detected; all other protec- tion functions are allowed to trip.
  • Page 13 For the AE logic to perform, special precautions must be taken to ensure that the DGP system and associated trip circuits remain in service when the generator is out of service. Additionally, the generator off-line input, DI1, must be reliable.
  • Page 14 C O N F I G U R A B L E (1) Indicates an optional function (includes associated logic). Refer to LOGIC (2) DGP nomenclature selection guide for available functions in a specific model. (2) Each of the available protection functions can be configured to operate any combination of the 8 output relays (4-Trip and 4-Alarm).
  • Page 15 A L A R M 7 4 D NOTE: (1) Timers TL21 and TL22 are available in models DGP***ACA only. C O N F I G U R A B L E LOGIC (2) (2) Each of the available protection functions can be configured to operate any combination of the 8 output relays (4-Trip and 4-Alarm).
  • Page 16 A N D (Off-Line) NOTES: (1) Indicates an optinal function (includes associated logic). Refer to DGP nomenclature selection guide for available functions in a specific model. C O N F I G U R A B L E LOGIC (2) (2) Each of the available protection functions can be configured to operate any combination of the 8 output relays (4-Trip and 4-Alarm).
  • Page 17 NOTES: (1) Indicates an optional function (includes associated logic). Refer to C O N F I G U R A B L E DGP nomenclature selection guide for available functions in a LOGIC (2) specific model. (2) Each of the available protection functions can be configured to operate any combination of the 8 output relays (4-Trip and 4-Alarm).
  • Page 18 * = 1 FOR 5 AMP RATED DGPs. D G P _ V T F F . V S D * = 5 FOR 1 AMP RATED DGPs. Figure 1–7: SIMPLE LOGIC DIAGRAM – VT FUSE FAILURE DGP Digital Generator Protection System GE Power Management...
  • Page 19 PS1 and PS2, are wired out to the terminal block. A hard wire jumper is used to select either the form A or the form B contact of each of the PS1 and PS2 relays, as shown in Figure 3–3: DGP POWER SUPPLY MODULE on page 3–4.

  • Page 20: Other Features

    A reset is not reported to the user by the DGP system. If the reset is successful, no message is printed, no fail- ure status is recorded, and the critical alarm is not generated. However, during the reset procedure, the red LED on the MMI panel will light and a failure code may appear on the MMI display.

  • Page 21: Trip Circuit Monitor

    The sampling frequency is based on 30.5 Hz for power system frequencies below 30.5 Hz and 79.5 Hz for the frequencies above 79.5 Hz. In either case, if the AC voltage to the DGP drops below approximately 20 V, the sampling frequency is automatically recalculated on the basis of the nominal system frequency (Setting 102: SYSFREQ).

  • Page 22: Time Synchronization

    DGP is not connected to a G-NET host computer, then a demodulated IRIG-B signal connected to optional port PL-3 may be used to synchronize the clock. In both cases, the clock in a given DGP is synchronized to within ±1 millisecond of any other digital relay clock, provided the two relays are wired to the same synchronizing sig- nal.

  • Page 23: Local Printer

    A fault report is initiated by any one of the protection-function pickup flags or an optional external oscillography trigger input, DI5. For the fault report to be completed and stored, the DGP either has to issue a trip or the DI5 input contact must close any time during the fault report period.
  • Page 24 For instance, when PL-1 is connected to host computer of an integration system, it is not possible to log into the DGP from the front port when the integration system is active. If PL-1 is connected to a modem and the front port is connected to a PC using a null-modem cable, then the first port that becomes active is given preference, and the other port is disabled until the first is released.
  • Page 25 1 PRODUCT DESCRIPTION 1.5 ELEMENTARY DIAGRAMS 1.5 ELEMENTARY DIAGRAMS Figure 1–9: ELEMENTARY DIAGRAM WITH TEST BLOCKS, WYE VTs GE Power Management DGP Digital Generator Protection System...
  • Page 26 1.5 ELEMENTARY DIAGRAMS 1 PRODUCT DESCRIPTION Figure 1–10: ELEMENTARY DIAGRAM WITH TEST BLOCKS, DELTA VTs DGP Digital Generator Protection System GE Power Management...
  • Page 27 1 PRODUCT DESCRIPTION 1.5 ELEMENTARY DIAGRAMS Figure 1–11: ELEMENTARY DIAGRAM WITHOUT TEST BLOCKS, WYE VTs GE Power Management DGP Digital Generator Protection System...
  • Page 28 1.5 ELEMENTARY DIAGRAMS 1 PRODUCT DESCRIPTION Figure 1–12: ELEMENTARY DIAGRAM WITHOUT TEST BLOCKS, DELTA VTs DGP Digital Generator Protection System GE Power Management...
  • Page 29 1 PRODUCT DESCRIPTION 1.5 ELEMENTARY DIAGRAMS 0286A2925ASH1.DWG 0286A4911 SH9.DWG Figure 1–13: DIGITAL RELAY SYMBOL LEGEND GE Power Management DGP Digital Generator Protection System...
  • Page 30 When establishing communication between the DGP and a remote PC, two modems connected via a phone line are required. One modem is located at the DGP and the other modem is located at the PC. The cable that connects the modems with the DGP and PC is shown in Figure 9–1: DGP COMMUNICATIONS WIRING on page 9–3.

  • Page 31: Null Modem Connections

    1 and 255 (for the Hayes-compatible modem assumed). Note that GE-Link (versions 2.0 and higher) configures the PC modem to wait 60 seconds for the DGP modem to answer. If the DGP modem register S0 is set higher than 12, the PC modem may time-out and hang up before the DGP modem can answer.
  • Page 32 MALE / FEMALE TO RELAY MMI MODULE COMM D) REMOTE COMMUNICATIONS FROM MMI MODULE TO PC CABLES AVAILABLE AS GE PART NO. 0246A9866. SPECIFY CABLE TYPE AND CONNECTOR GENDER. Figure 9–1: DGP COMMUNICATIONS WIRING GE Power Management DGP Digital Generator Protection System...
  • Page 33 9 COMMUNICATIONS 9.1.6 RS485 COMMUNICATIONS The DGP with Modbus communications can be used with a GE Power Management RS485 to RS232 con- verter when necessary. For computers without RS485 capability, a “master” SCI box is required as shown in the figure below. The SCI boxes are available from GE Power Management as catalog number S14200 X , where X specifies the voltage input.
  • Page 34 DGP relays can be configured as slaves to a single Modbus master through the RS485 port (using an RS485 to RS232 converter). The DGP is always a slave – it cannot be programmed as a master. Even though the Modbus protocol is available in Modbus RTU, Modbus ASCII and Modbus Plus protocols, only the Modbus RTU protocol is supported by the DGP.

  • Page 35: Modbus Communications

    FUNCTION CODE This is the second byte of every transmission. Modbus defines function codes 1 to 127 but the DGP imple- ments only a subset of these functions. In a master request, the function code represents the action to be per- formed by the slave.
  • Page 36 Number of registers to read. Data 1 High Byte first then Low byte ..Data n High Byte first then Low byte CRC calculated by slave. High byte first, Low byte next GE Power Management DGP Digital Generator Protection System...

  • Page 37: Modbus Functions

    9 COMMUNICATIONS 9.3.2 FUNCTION CODE 05: FORCE SINGLE COIL a) DESCRIPTION This function code allows the master to request a DGP slave to perform a specific command operation. b) QUERY The query message specifies the command to be executed. Field:...

  • Page 38: Function Code 06: Store Single Setpoint

    9.3 MODBUS FUNCTIONS 9.3.3 FUNCTION CODE 06: STORE SINGLE SETPOINT a) DESCRIPTION This function code allows the master to preset a DGP setpoint or to write to some control registers during the report reads. b) QUERY The query message specifies the setpoint to be preset...
  • Page 39 9.3.5 FUNCTION CODE 56: RETRANSMIT LAST PACKET a) DESCRIPTION This function is not supported by the Modbus protocol as it is a GE specific enhancement. When this command is issued, the last response from the slave is simply repeated. b) QUERY Example of a query message.

  • Page 40: Error Responses

    9.4 MODBUS ERRORS 9.4.1 ERROR RESPONSES When a DGP slave detects an error a response will be sent to the master. The MSBit of the function code will be set to 1 and the following byte is an exception code.

  • Page 41: Data Types

    11. SOE: Eight registers. The first seven registers correspond to date and time according to format DT0. Reg- ister 8 is the event code (see DGP event code list below). If the requested event contains no data, then all 8 registers contain a value of 0.
  • Page 42 9.5.2 MEMORY MAP ORGANIZATION The register maps have been designed by function basis as for GE-Modem to facilitate ease of design. For example, the Set Date and Time function is implemented by writing to certain setpoint registers even though it is not a part of the actual settings group.
  • Page 43 The TRIP TYPE field is a 16-bit binary value representing the function that has tripped due to the fault. The bit assignments are as follows: bit 0 - 94G bit 1 - 94G1 bit 2 - 94G2 bit 3 - 94G3 bits 4 to 15 - reserved and presently set to zero DGP Digital Generator Protection System GE Power Management...

  • Page 44: Control Registers

    That is, for one fault the range is 1 to 120, for two faults the range is 1 to 60, and for three faults it is 1 to 40. In addition, if the fault number is set higher than the number of faults recorded, the DGP slave responds with ILLEGAL DATA VALUE exception.

  • Page 45: Communication Example

    17FFH with the fault number. When a request is made to read these registers, the DGP looks at registers 17FEH and 17FFH. If they are within range, it responds with the oscillography data corresponding to the fault number and cycle number in registers 17FFH and 17FEH.

  • Page 46: Event Codes

    9.5 MODBUS MEMORY MAPPING 9.5.9 EVENT CODES & STATUS REGISTERS a) EVENT CODES A list of DGP event codes with their corresponding event messages is shown below: FAIL - DAP BOARD: PROM 41 FAIL - PS2 BOARD: +12 VOLTAGE FAILED...
  • Page 47 DIGITAL INPUT 6 OPEN 81-3U ON ACCIDENTAL ENGERGIZATION ON 81-3U OFF ACCIDENTAL ENGERGIZATION OFF 81-4U ON 27TN ON 81-4U OFF 27TN OFF 51GN ON " " 51GN OFF " " 27 ON " " DGP Digital Generator Protection System GE Power Management...
  • Page 48 DSP1 BOARD: FAILURE CLEARED PS BOARD: +12V FAILURE CLEARED DSP2 BOARD: FAILURE CLEARED PS BOARD: -12V FAILURE CLEARED DSP3 BOARD: FAILURE CLEARED ANI BOARD: CURRENT SUM FAILURE CLEARED SSP BOARD: FAILURE CLEARED GE Power Management DGP Digital Generator Protection System...
  • Page 49 22 = VTFF bit 8 = SSP CAPRAM Failure 23 = OSC bit 9 = SSP Real Time Clock Failure 24 = DI-3 bit 10 = Version Number Mismatch 25 = DI-4 DGP Digital Generator Protection System GE Power Management...
  • Page 50 0 = POWER SUPPLY 1: PWR1STAT: +12 V Warning bit 6-9 = Spare bit 1 = POWER SUPPLY 2: bit 10 = DSP2 Version Number Failure +12 V Warning bit 11-14 = Spare GE Power Management DGP Digital Generator Protection System...
  • Page 51 11 = 94G-A Trip Continuity Error bit 12 = 94G-B Trip Continuity Error bit 13 = 94G-C Trip Continuity Error bit 14 = 94G-D Trip Continuity Error bit 15 = Spare DGP Digital Generator Protection System GE Power Management...
  • Page 52 9.5 MODBUS MEMORY MAPPING c) OSC SETTINGS Each register contains one Setting in sequential order according to Table 2–1: DGP SYSTEM SETTINGS & RATINGS on page 2–3. Note that a cycle number and fault number must be selected (registers 17FEh to 17FF) prior to reading OSC Settings.

  • Page 53: Date And Time

    The setting registers can be read by using function codes 03H/04H. The setting registers can be preset by using function codes 06H/10H. The settings register map contains all settings available in all DGP models. Since some settings are not valid for some models, an ILLEGAL ADDRESS exception may be obtained when reading/writing multiple setpoints.

  • Page 54: Memory Map

    9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING 9.5.14 MEMORY MAP Table 9–3: DGP MODBUS MEMORY MAP (Sheet 1 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS FIXED VALUE REPORT Model Number ASCII Version Number ASCII PRESENT VALUE REPORT 1024...
  • Page 55 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 2 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 1070 BOOLEAN 1071 SYS FREQ INT2 1072 SAMP FREQ INT1 1073 Event Fault Flags EVENT REPORT...
  • Page 56 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 3 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 2273 Event 29 2281 Event 30 2289 Event 31 2297 Event 32 2305 Event 33 2313...
  • Page 57 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 4 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 2545 Event 63 2553 Event 64 2561 Event 65 2569 Event 66 2577 Event 67 2585...
  • Page 58 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 5 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 2817 Event 97 2825 Event 98 2833 Event 99 2841 Event 100 FAULT STATUS 3072 Num Faults...
  • Page 59 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 6 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 4139 102B Fault INS LONG2 4141 102D Fault IAR LONG2 4143 102F Fault IBR LONG2 4145...
  • Page 60 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 7 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 4385 1121 Fault VC VOLT LONG1 4387 1123 Fault VN VOLT LONG1 4389 1125 Fault IAS...
  • Page 61 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 8 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 4632 1218 Prefault Watts F3 WATT LONG1 4634 121A Prefault Vars F3 LONG1 4636 121C Prefault SysFreq F3...
  • Page 62 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 9 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5124 1404 SELPRIM BOOLEAN 5125 1405 CT RATIO INTO 5126 1406 VT RATIO INT1 5127 1407...
  • Page 63 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 10 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5158 1426 32-1 TRIP 5159 1427 32-1 ALARM 5160 1428 32-1 SQ TR EN LONG0 5161...
  • Page 64 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 11 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5192 1448 59 ALARM 5193 1449 59 INV PU VOLT INTO 5194 144A 59 TIME FAC...
  • Page 65 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 12 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5226 146A 81-4U SETPNT INT2 5227 146B 81-4U TL11 INT2 5228 146C DIG INP SELBKD11 INTO...
  • Page 66 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 13 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5639 1607 INR SAMP1 INT2 5640 1608 VA SAMP1 VOLT INT1 5641 1609 VB SAMP1 VOLT...
  • Page 67 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 14 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5673 1629 SAMPPD SAMP2 5674 162A IAS SAMP3 INT2 5675 162B IBS SAMP3 INT2 5676 162C...
  • Page 68 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 15 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5707 164B DI SAMP4 5708 164C DO SAMP4 5709 164D PUFLG0 SAMP4 5710 164E PUFLG1 SAMP4...
  • Page 69 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 16 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5741 166D IAR AMP6 INT2 5742 166E IBR SAMP6 INT2 5743 166F ICR SAMP6 INT2 5744...
  • Page 70 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 17 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5775 168F PRFLG0 SAMP7 5776 1690 PRFLG1 SAMP7 5777 1691 PRFLG2 SAMP7 5778 1692 SAMPPD SAMP7...
  • Page 71 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 18 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5809 16B1 VB SAMP9 VOLT INT1 5810 16B2 VC SAMP9 VOLT INT1 5811 16B3 VN SAMP9...
  • Page 72 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 19 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5843 16D3 IBS SAMP11 INT2 5844 16D4 ICS SAMP11 INT2 5845 16D5 INS SAMP11 INT2 5846...
  • Page 73 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 20 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 5877 16F5 PUFLG0 SAMP12 5878 16F6 PUFLG1 SAMP12 5879 16F7 PUFLG2 SAMP12 5880 16F8 PRFLG0 SAMP12...
  • Page 74 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 21 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 16390 4006 VT RATIO INT1 16391 4007 COMMPORT 16392 4008 PHASE BOOLEAN 16393 4009 TIMESYNC 16394...
  • Page 75 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 22 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 18177 4701 32-1 ALARM 18178 4702 32-1 SQ TR EN LONG0 18179 4703 32- 1 REV PWR...
  • Page 76 9 COMMUNICATIONS 9.5 MODBUS MEMORY MAPPING Table 9–3: DGP MODBUS MEMORY MAP (Sheet 23 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 19971 4E03 59 TIME FAC INT2 19972 4E04 59 CURVE # INTO 19973 4E05 59 INST PU...
  • Page 77 9.5 MODBUS MEMORY MAPPING 9 COMMUNICATIONS Table 9–3: DGP MODBUS MEMORY MAP (Sheet 24 of 24) ADDRESS ITEM NAME UNITS FORMAT NO. OF REGISTERS 22274 5702 81-4O SETPNT INT2 22275 5703 81-4O TL18 INT2 22528 5800 DIG INP SELBKD11 INTO...
  • Page 78 9.6 COIL COMMANDS 9.6.1 DESCRIPTION The following coil commands are accepted by the DGP relay. Multiple commands are not supported. They can be executed only by the function code 05H. Both the hexadecimal and decimal coil addresses are offset. Table 9–4: COIL COMMANDS Table 9–4: COIL COMMANDS...
  • Page 79 GE internal factory commands. The DGP relay will not respond to a CRC failure, if the slave address is 255. When the relay is placed in multi- drop configuration, it possible to receive a slave ID of 255, due to some communication error. Therefore the relay will not respond.

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