GE RX3i User Manual page 111

Chapter 6. Programming EGD Commands
(Words 13 - 14) Remote PLC - Memory Starting Address: Words 13,14 determine the starting address in the
remote PLC from which the data is to be read. The value entered is the 32-bit offset (1-based) from the
beginning of PLC memory for the memory type and mode specified in Word 12. Word 13 contains the least
significant 16 bits of the offset; word 14 contains the most significant 16 bits of the offset. This offset will be
either in bits, bytes, or words depending on the mode specified (for example, if Word 12=16 and Words 13, 14
=9, 0, then the starting address will be %I65). Valid ranges of values depend on the remote PLC's memory
ranges.
(Word 15) Remote 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 the remote PLC memory
type (bit, byte, or word) is specified in Word 12. For example, if Word 12=16 and Word 15=4, then 4 bytes (32
bits) of %I memory will be transferred. For Read PLC Memory, the maximum length is 11200 bits, 1400 bytes, or
700 words of data, or the amount of memory available in the PLC for the selected memory type, whichever is
less.
(Word 16) Remote PLC - Network Address Type: Word 16 specifies the format of the remote PLC address.
Word 16 must contain the value 1. This indicates a dotted-decimal IP address expressed using a separate
register for each decimal digit.
(Word 17) Remote PLC - Network Address Length: Word 17 specifies the length in words of the remote PLC IP
address in this COMMREQ Command Block. Word 17 must contain 4.
(Words 18 – 21) Remote PLC - IP Address: Words 18–21 specify the four integers, one integer per word, of the
dotted-decimal IP address of the remote PLC to be accessed.
98 PACSystems* RX7i & RX3i TCP/IP Ethernet Communications User Manual GFK-2224Q