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GFK-1541B Chapter 3 Programming Channel Commands 3-25
3
(Word 14) Local PLC - Memory Starting Address:
Word 14 determines the starting address in
the local PLC from which the data is to be sent. 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.
(Word 15) Local PLC - Number of Memory Units:
Word 15 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 13. For example, if Word 13=16
and Word 15=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 16) Reserved:
Word 16 is reserved and should contain the value zero.
(Word 17) Reserved:
Word 17 is reserved and should contain the value zero.
(Word 18) Remote Host - Network Address Type:
Word 18 specifies the format of the remote
host’s address. In this release, 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 Host - Network Address Length:
Word 19 specifies the length in words of
the remote host’s IP address. When an address type of 1 is specified in Word 18, Word 19 must
contain 4.
(Words 20–23) Remote Host - IP Address:
Words 20–23 specify the four integers, one integer
per word, of the dotted-decimal IP address of the remote host to be accessed.