Communication-capable Circuit Breakers
WL Circuit Breaker
Function 15: Write Multiple Coils
Function | This function sets the state of multiple control bits and extra flags in a COM16 slave. | ||||||
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Bit Start Address | Any value from 0000 hex to 000F hex. If any other address is specified, an Exception Code of 02 (Invalid Data | ||||||
| Address) will be returned. |
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Quantity of Bits | If “Quantity of Bits” is not in the range of 1 to 16, an Exception Code of 03 (Invalid Data Value) will be returned. | ||||||
| If an attempt to write a bit beyond Bit Address 000F hex is made, an Exception Code of 02 (Invalid Data Address) | ||||||
| will be returned. |
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Byte Count | This is the “Quantity of Bits” / 8. If the division remainder is | ||||||
| Count” is incorrect, an Exception Code of 03 (Invalid Data Value) is returned. | ||||||
| The following is an example of a request to set the state of six extra flags in a COM16 slave device at MODBUS | ||||||
| address 7. Attempts to change unused bits will have no effect. Setting the indicated bits would: Clear Logs, Clear | ||||||
| Min./Max., Clear Counters and Sync Time Stamp. |
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| Bit: | 10 | 11 | 12 | 13 | 14 | 15 |
| State: | 1 | 1 | 0 | 0 | 1 | 1 |
The data contents are one byte: 33 hex (0011 0011 binary). The binary bits correspond in the following way:
The byte transmitted (33 hex) addresses bits 10 ... 15, with the least significant bit addressing the lowest bit (10) in this set. The unused bits are
The response returns the slave address, function code, starting address and Quantity of Bits written.
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WL MODBUS Communication and Electronic Accessories • January 2005
