Cutler-Hammer D320 PLC, User Manual

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D320 PLC User's Manual
Write Bits and Words
•
Changes the content of the bits or words at the specified absolute addresses.
•
Words and bits may be modified regardless of their order and location in memory.
Query (Q) Frame
Response (R) Frame
Fixed
DA SA $86 $01 $00 L H
CRC
DA SA $06 L L H D0 L H D0 … L H
Methods of assigning bit/word absolute address
Assigning abs. address for bits
Ax = 0001 1011 1111 1100
Ax L = $FC, H = $1B
Assigning abs. address for word
0 0 Bit Address Abs. address for the K127 word = $01BF
0 1 Word Address Ax = 0100 0001 1011 1111
1 x Not Used Ax L = $BF, H = $41
If Ax denotes a bit address, the Dx data is 1 byte (On = $FF, Off = $00),
and if Ax denotes a word address, the Dx data is 1 word (2 bytes).
When structuring the
outgoing frame, be aware
that the Dx of the Q
changes according to the
bit/word Ax type, and the L
(information length)
changes as well. The Dx
will be either 1 or 2 bytes.
Absolute Address
15 14 13 0
A0 A1 CRC