
Modbus Memory Map
Table 1: 489 Memory Map (Sheet 17 of 29)
489
Communications Guide
| ADDR | NAME | RANGE | STEP | UNITS | FORMAT | DEFAULT | 
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| 2009 | Undervoltage Curve Reset Rate | 0 to 9999 | 1 | s | F2 | 14 | 
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| 200A | Undervoltage Curve Element | 0 to 1 | 1 | – | F208 | 0 | 
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| VOLTAGE ELEMENTS / OVERVOLTAGE | 
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| 2020 | Overvoltage Alarm | 0 to 2 | 1 | – | F115 | 0 | 
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| 2021 | Assign Alarm Relays  | 1 to 4 | 1 | – | F50 | 16 | 
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| 2022 | Overvoltage Alarm Pickup | 101 to 150 | 1 | ⋅ Rated | F3 | 115 | 
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| 2023 | Overvoltage Alarm Delay | 1 to 1200 | 1 | s | F2 | 30 | 
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| 2024 | Overvoltage Alarm Events | 0 to 1 | 1 | – | F105 | 0 | 
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| 2025 | Overvoltage Trip | 0 to 2 | 1 | – | F115 | 0 | 
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| 2026 | Assign Trip Relays  | 0 to 3 | 1 | – | F50 | 1 | 
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| 2027 | Overvoltage Trip Pickup | 101 to 150 | 1 | ⋅ Rated | F3 | 120 | 
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| 2028 | Overvoltage Trip Delay | 1 to 100 | 1 | s | F2 | 10 | 
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| 2029 | Overvoltage Curve Reset Rate | 0 to 9999 | 1 | s | F2 | 14 | 
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| 202A | Overvoltage Curve Element | 0 to 1 | 1 | – | F208 | 0 | 
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| VOLTAGE ELEMENTS / VOLTS/HERTZ | 
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| 2040 | Volts/Hertz Alarm | 0 to 2 | 1 | – | F115 | 0 | 
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| 2041 | Assign Alarm Relays  | 1 to 4 | 1 | – | F50 | 16 | 
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| 2042 | Volts/Hertz Alarm Pickup | 50 to 199 | 1 | ⋅ Nominal | F3 | 100 | 
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| 2043 | Volts/Hertz Alarm Delay | 1 to 1500 | 1 | s | F2 | 30 | 
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| 2044 | Volts/Hertz Alarm Events | 0 to 1 | 1 | – | F105 | 0 | 
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| 2045 | Volts/Hertz Trip | 0 to 2 | 1 | – | F115 | 0 | 
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| 2046 | Assign Trip Relays  | 0 to 3 | 1 | – | F50 | 1 | 
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| 2047 | Volts/Hertz Trip Pickup | 50 to 199 | 1 | ⋅ Nominal | F3 | 100 | 
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| 2048 | Volts/Hertz Trip Delay | 1 to 1500 | 1 | s | F2 | 10 | 
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| 2049 | Volts/Hertz Curve Reset Rate | 0 to 9999 | 1 | s | F2 | 14 | 
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| 204A | Volts/Hertz Trip Element | 0 to 3 | 1 | – | F211 | 0 | 
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| VOLTAGE ELEMENTS / PHASE REVERSAL | 
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| 2060 | Phase Reversal Trip | 0 to 2 | 1 | – | F115 | 0 | 
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| 2061 | Assign Trip Relays  | 0 to 3 | 1 | – | F50 | 1 | 
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| VOLTAGE ELEMENTS / UNDERFREQUENCY | 
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| 2080 | Block Underfrequency From Online | 0 to 5 | 1 | s | F1 | 1 | 
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| 2081 | Voltage Level Cutoff | 50 to 99 | 1 | ⋅ Rated | F3 | 50 | 
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| 2082 | Underfrequency Alarm | 0 to 2 | 1 | – | F115 | 0 | 
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| 2083 | Assign Alarm Relays  | 1 to 4 | 1 | – | F50 | 16 | 
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| 2084 | Underfrequency Alarm Level | 2000 to 6000 | 1 | Hz | F3 | 5950 | 
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| 2085 | Underfrequency Alarm Delay | 1 to 50000 | 1 | s | F2 | 50 | 
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| 2086 | Underfrequency Alarm Events | 0 to 1 | 1 | – | F105 | 0 | 
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| 2087 | Underfrequency Trip | 0 to 2 | 1 | – | F115 | 0 | 
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| 2088 | Assign Trip Relays  | 0 to 3 | 1 | – | F50 | 1 | 
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| 2089 | Underfrequency Trip Level 1 | 2000 to 6000 | 1 | Hz | F3 | 5950 | 
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| 208A | Underfrequency Trip Delay 1 | 1 to 50000 | 1 | s | F2 | 600 | 
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| 208B | Underfrequency Trip Level 2 | 2000 to 6000 | 1 | Hz | F3 | 5800 | 
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| 208C | Underfrequency Trip Delay 2 | 1 to 50000 | 1 | s | F2 | 300 | 
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| VOLTAGE ELEMENTS / OVERFREQUENCY | 
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| 20A0 | Block Overfrequency From Online | 0 to 5 | 1 | s | F1 | 1 | 
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| 20A1 | Voltage Level Cutoff | 50 to 99 | 1 | ⋅ Rated | F3 | 50 | 
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| 20A2 | Overfrequency Alarm | 0 to 2 | 1 | – | F115 | 0 | 
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| 20A3 | Assign Alarm Relays  | 1 to 4 | 1 | – | F50 | 16 | 
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| 20A4 | Overfrequency Alarm Level | 2501 to 7000 | 1 | Hz | F3 | 6050 | 
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| 20A5 | Overfrequency Alarm Delay | 1 to 50000 | 1 | s | F2 | 50 | 
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| 20A6 | Overfrequency Alarm Events | 0 to 1 | 1 | – | F105 | 0 | 
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| 20A7 | Overfrequency Trip | 0 to 2 | 1 | – | F115 | 0 | 
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| 20A8 | Assign Trip Relays  | 0 to 3 | 1 | – | F50 | 1 | 
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1, 2, 3 See Table footnotes on page 39
| GE Multilin | 
http://www.GEindustrial.com/multilin
| 27 | 
