GE GFK-1541B manual Type Value Description Decimal Hex

(Word 4) COMMREQ Status Word Address Offset:

(Word 3) COMMREQ Status Word Memory Type:

COMMREQ Status Word:

4

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.

This word specifies the memory type for the

CRS word. The memory types are listed in the table below:

Type	Value	Value	Description
	(Decimal)	(Hex.)
%R	8	08H	Register memory (word mode)
%AI	10	0AH	Analog input memory (word mode)
%AQ	12	0CH	Analog output memory (word mode)
%I	16	10H	Discrete input memory (byte mode)
	70	46H	Discrete input memory (bit mode)
%Q	18	12H	Discrete output memory (byte mode)
	72	48H	Discrete output memory (bit mode)
%T	20	14H	Discrete temporary memory (byte mode)
	74	4AH	Discrete temporary memory (bit mode)
%M	22	16H	Discrete momentary internal memory (byte mode)
	76	4CH	Discrete momentary internal memory (bit mode)
%G	56	38H	Discrete global data table (byte mode)
	86	56H	Discrete global data table (bit mode)

This word contains the offset within the

memory type selected. The status word address offset is a zero-based number. For example, 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 decimal. Note, however, that this is the only zero-based field in the Channel commands.

(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 performed. For information on how to fill in the Channel command information, see the next section.

GFK-1541B Chapter 4 Programming Modbus/TCP Channel Commands 4-7