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GFK-1541B Chapter 3 Programming Channel Commands 3-13
3
(Word 14) Local PLC - Memory Starting Address:
Word 14 determines the starting address in the
local PLC in which the data from the remote PLC is to be stored. The value entered is the offset (1-
based) from the beginning of PLC memory for the memory type and mode specified in Word 13.
This offset will be either in bits, bytes, or words depending on the mode specified (for example, if
Word 13=16 and Word 14=2, then the starting address will be %I9). Valid ranges of values depend
on the PLC’s memory ranges. The user is responsible for assuring that this area is large enough to
contain the requested data without overwriting other application data.
(Word 15) Remote PLC - Memory Type:
Words 15–16 specify the memory type and starting
address in the remote PLC from which the data is to be read. Valid values for Word 15 are listed
above. If %P memory is used, you must specify a Program name in Words 24–27. If %L
memory is used, you must specify a Program name in Words 24 –27 and a Program Block name
in Words 28–31.
(Word 16) Remote PLC - Memory Starting Address:
Word 16 determines the starting address in
the remote PLC from which the data is to be read. The value entered is the offset (1-based) from the
beginning of PLC memory for the memory type and mode specified in Word 15. This offset will be
either in bits, bytes, or words depending on the mode specified (for example, if Word 15=16 and
Word 16=9, then the starting address will be %I65). Valid ranges of values depend on the remote
PLC’s memory ranges.
(Word 17) Remote PLC - Number of Memory Units:
Word 17 specifies the amount of data to be
transferred. The value entered is the number of memory units to be transferred, where the size of
a memory unit is either a bit, byte, or word as specified in Word 15. For example, if Word 15=16
and Word 17=4, then 4 bytes (32 bits) of %I memory will be transferred.
For the Series 90-30 PLC, a maximum of 8192 bits, 1024 bytes, or 512 words of data can be
specified.
For the Series 90-70 PLC, a maximum of 16384 bits, 2048 bytes, or 1024 words of data can
be specified.
(Word 18) Remote PLC - Network Address Type:
Word 18 specifies the format of the remote
PLC address. Currently, Word 18 must contain the value 1 or 3. A value of 1 indicates a dotted-
decimal IP address expressed using a separate register for each decimal digit. A value of 3
indicates a Network Address name. See Example 2 for information on using address type 3.
(Word 19) Remote PLC - Network Address Length:
Word 19 specifies the length in words of
the remote PLC IP address. When an address type of 1 is specified in Word 18, Word 19 must
contain 4.