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TCP/IP Ethernet Communications User’s Manual - August 1997 GFK-1084B
COMMREQ Status Word: The Ethernet Interface updates the CRS word to show success
or failure of the command. Command words 3 and 4 specify the PLC memory location
of the CRS word.
(Word 3) COMMREQ Status Word Pointer Memory Type: This word specifies the memory
type for the CRS word. The memory types are listed in the table below.
%R 8 08h Register memory (word mode)
%AI 10 0Ah Analog input memory (word mode)
%AQ 12 0Ch Analog output memory (word mode)
Discrete input memory (byte mode)
Discrete input memory (bit mode)
Discrete output memory (byte mode)
Discrete output memory (bit mode)
Discrete temporary memory (byte mode)
Discrete temporary memory (bit mode)
Discrete momentary internal memory (byte mode)
Discrete momentary internal memory (bit mode)
Discrete global data table (byte mode)
Discrete global data table (bit mode)
(Word 4) COMMREQ Status Word Pointer Offset: This word contains the offset within
the memory type selected. The status word pointer offset is a zero-based number. For ex-
ample, if you want %R1 as the location of the CRS word, you must specify a zero for the
offset. The offset for %R100 would be 99. Note, however, that this is the only zero-
based field in the Channel commands.
For information on the contents of the COMMREQ Status word, see Section 4.
(Word 5): Reserved. Set to zero.
(Word 6): Reserved. Set to zero.
(Words 7 and up) Data Block: The Data Block defines the Channel command to be per-
formed. For information on how to fill in the Channel command information, see Sec-