Chapter 6. Programming EGD Commands100 PACSystems* RX7i & RX3i TCP/IP Ethernet Communications User Manual GFK-2224Qfrom the beginning of PLC memory for the memory type and mode specified in Word 9. Word 10 contains theleast significant 16 bits of the offset; word 11 contains the most significant 16 bits of the offset. This offset willbe either in bits, bytes, or words depending on the mode specified. (For example, if Word 9=16 and Words 10,11= 2, 0 then the starting address will be %I9.) Valid ranges of values depend on the PLC’s memory ranges.(Word 12) Remote PLC - Memory Type: Words 12–14 specify the memory type and starting address in theremote PLC where data is to be written. Valid values for Word 12 are listed above.(Words 13 - 14) Remote PLC - Memory Starting Address: Words 13, 14 determine the starting address in theremote PLC where data is to be written. The value entered is the 32-bit offset (1-based) from the beginning ofPLC memory for the memory type and mode specified in Word 12. Word 13 contains the least significant 16bits 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 thestarting 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 memorytype (bit, byte, or word) is specified in Word 12. For example, if Word 12=16 and Word 15=4, then 4 bytes (32bits) of %I memory will be transferred. For Write PLC Memory, the maximum length is 11200 bits, 1400 bytes, or700 words of data, or the amount of memory available in the PLC for the selected memory type, whichever isless.(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 separateregister for each decimal digit.(Word 17) Remote PLC - Network Address Length: Word 17 specifies the length in words of the remote PLC IPaddress 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 thedotted-decimal IP address of the remote PLC to be accessed.
