The number of points value is two bytes in length. It specifies the number of input points returned
in the normal response. The sum of the starting point value and the number of points value must
be less than or equal to the highest input point number available in the attached CPU. The high
order byte of the Starting Point Number and Number Of Bytes fields is sent as the first byte. The
low order byte is the second byte in each of these fields.
Response:
▪ The byte count is a binary number from 1 to 256 (0 = 256). It is the number of bytes in the normal
response following the byte count and preceding the error check.
▪ The Data field of the normal response is packed input status data. Each byte contains eight input
point values. The least significant bit (LSB) of the first byte contains the value of the input point
whose number is equal to the starting point number plus one. The values of the input points are
ordered by number starting with the LSB of the first byte of the Data field and ending with the
most significant bit (MSB) of the last byte of the Data field. If the number of points is not a multiple
of 8, then the last data byte contains zeroes in one to seven of its highest order bits.
Query:
▪ An address of 0 is not allowed as this request cannot be a broadcast request.
▪ The function code is equal to 3.
▪ 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 attached CPU. It is equal to one less
than the number of the first register returned in the normal response to 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 value and the number of registers value must be less
than or equal to the highest register number available in the attached CPU. 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.
Response:
▪ The byte count is a binary number from 2 to 250 inclusive. It is the number of bytes in the normal
response following the byte count and preceding the error check. Note that the byte count is
equal to two times the number of registers returned in the response. A maximum of 250 bytes
(125) registers is set so that the entire response can fit into one 256-byte data block.
▪ 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.
▪ An Address of 0 is not allowed as this request cannot be a broadcast request.
▪ The function code is equal to 4.
▪ The Starting Analog Input Number is two bytes in length. The Starting Analog Input Number may
be any value less than the highest analog input number available in the attached CPU. It is equal
to one less than the number of the first analog input returned in the normal response to this
request.
▪ The Number Of Analog Inputs value is two bytes in length. It must contain a value from 1 to 125
inclusive. The sum of the Starting Analog Input value and the Number Of Analog Inputs value
must be less than or equal to the highest analog input number available in the at-attached CPU.
The high order byte of the Starting Analog Input Number and Number of Analog Inputs 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.
Response:
▪ The Byte Count is a binary number from 2 to 250 inclusive. It is the number of bytes in the normal
response following the byte count and preceding the error check. Note that the Byte Count is
equal to two times the number of analog inputs returned in the response. A maximum of 250
bytes (125) analog inputs is set so that the entire response can fit into one 256-byte data block.
▪ The analog inputs are returned in the Data field in order of number with the lowest number
analog input in the first two bytes and the highest number analog input in the last two bytes of
the Data field. The number of the First Analog Input in the Data field is equal to the Starting
analog input number plus one. The high order byte is sent before the low order byte of each
analog input.
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