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Modbus Functions
Function Code 16: Store Multiple Setpoints
489
Communications Guide
Modbus Implementation: Preset Multiple Registers
489 Implementation: Store Multiple Setpoints
This function code allows multiple Setpoints to be stored into the 489 memory. Modbus “registers” are
Message Format and Example:
Request slave 11 to store the value 01F4 to Setpoint address 1180 and the value 0001 to setpoint address 1181. After the transmission in this example is complete,
489 slave 11 will have the following setpoints information stored:
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1180 |
| 01F4 |
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1181 |
| 0001 |
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Master Transmission | Bytes | Example | Description | |||
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Slave Address |
| 1 | 0B | message for slave 11 | ||
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Function Code |
| 1 | 10 | store setpoints | ||
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Data Starting Address | 2 | 11 80 | data starting at 1180h | |||
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Number of Setpoints | 2 | 00 02 | 2 setpoints = 4 bytes total | |||
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Byte Count |
| 1 | 04 | 2 registers = 4 bytes | ||
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Data 1 |
| 2 | 01 F4 | data for address 1180h | ||
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Data 2 |
| 2 | 00 01 | data for address 1181h | ||
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CRC (low, high) |
| 2 | 9B 89 | computed CRC error code | ||
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Slave Response |
| Bytes | Example | Description | ||
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Slave Address |
| 1 | 0B | message from slave 11 | ||
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Function Code |
| 1 | 10 | store multiple setpoints | ||
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Data Starting Address | 2 | 11 80 | data starting at 1180h | |||
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Number of Setpoints | 2 | 00 02 | 2 setpoints (4 bytes total) | |||
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CRC (low, high) |
| 2 | 45 B6 | computed CRC error code | ||
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GE Multilin |
http://www.GEindustrial.com/multilin
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