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C-16 Micro PLC Programmer’s Guide – April 1994
GFK-0804B
Message (16): Preset Multiple Registers
Format:
Address Func
16
Query
Address Func Error Check
16
Normal Response
Register No. Registers
Starting Number of
Count
Data Error CheckByte
Register No. Registers
Starting Number of
Query:
An address of 0 indicates a broadcast request. All slave stations process a broadcast
request and no response is sent.
The value of the function code is 16.
The starting register number is two bytes in length. The starting register number
may be any value less than the highest register number available in the Micro PLC.
It is equal to one less than the number of the first register preset by this request.
The number of registers value is two bytes in length. It must contain a value from 1
to 125 inclusive. The sum of the starting register number and the number of
registers value must be less than or equal to the highest register number available in
the Micro PLC. The high order byte of the starting register number and number of
registers fields is sent as the first byte in each of these fields. The low order byte is
the second byte in each of these fields.
The byte count field is one byte in length. It is a binary number from 2 to 250
inclusive. It is equal to the number of bytes in the data field of the preset multiple
registers request. Note that the byte count is equal to twice the value of the number
of registers.
The registers are returned in the data field in order of number with the lowest
number register in the first two bytes and the highest number register in the last two
bytes of the data field. The number of the first register in the data field is equal to
the starting register number plus one. The high order byte is sent before the low
order byte of each register.
Response:
The description of the fields in the response are covered in the query description.