GE GFK-1004B user manual Programming Communications Requests

4

(Word 14) Local PLC - Memory Starting Address: Word 14 specifies the starting address in the local PLC from which the data is to be written (1-based).

(Word 15) Remote PLC - Memory Type: Words 15-16 specify the memory type and starting address in the remote PLC to which the data is to be stored. Valid memory types are listed in Table 4-2. The user is responsible for assuring that this area is large enough to contain the requested data without overwriting other application data.

(Word 16) Remote PLC - Memory Starting Address: Word 16 specifies starting address in the remote PLC to which the data is to be stored. Valid ranges of values depend on the remote PLC (1-based).

(Word 17) Remote PLC - Number of Memory Units: Word 17 specifies the number of bits, bytes or words to be written, determined by the remote PLC memory type specified. For example, if the memory type is %I, this is the number of bits. If the memory type is %R, this is the number of words. A maximum of 16384 bits/2048 bytes/1024 words of data may be specified.

(Word 18) Remote PLC - PLC (Node) Address Type: Word 18 specifies the format of the remote IP address. In this release Word 18 must contain one (1), the address type indicating a word-oriented, dotted-decimal IP address of a remote PLC.

(Word 19) Remote PLC - PLC (Node) Address Length: Word 19 specifies the length in words of the remote IP address. In this release Word 19 must contain four (4).

(Words 20-23) Remote PLC - PLC (Node) IP Address: Words 20-23 specify the four integers, one integer per word, of the dotted-decimal IP address of the remote PLC to be accessed.

Words 24 - 27 Remote PLC - Program Name: Word 24 - 27 specify the case-sensitive, zero-terminated and padded program name (also called task name, which can be found through the PROG Station Manager command on the server Ethernet Interface) to be used with access to remote %P or%L memory. These words are required only for access to such memory and will be ignored if the Memory Type field is not %P or %L.

Word 28 - 31 Remote PLC - Program Block Name: Words 28 - 31 specify the case- sensitive, zero-terminated and padded program block name (which can be found in the program block declaration in the server ladder program) to be used with access to remote %L memory. These words are required only for access to such memory and will be ignored if the Memory Type field is not %P or %L.

Note

The Program Name (words 24 - 27) and Program Block Name (words

28 - 31) must have each pair of ASCII characters reversed within the PLC memory. For example, the name ªMARYº (ªMº = 4DH, ªAº = 41H, ªRº = 52H, ªYº = 59H) would have 414D in the first word and 5952 in the second word.

GFK-1004B Chapter 4 Programming Communications Requests 4-17