GE PACSystems RX7i, User Manual

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Chapter 7. Programming SRTP Channel Commands
122 PACSystems* RX7i & RX3i TCP/IP Ethernet Communications User Manual GFK-2224Q
(Word 13) Local PLC - Memory Type: Words 13–14 specify the location in the local PLC where the Ethernet
Interface will get the data to be written to the remote PLC. Valid values for Word 13 are listed in the description
of Establish Read Channel. The amount of data to be transferred is specified by the number of memory units of
the data written to the remote PLC (Word 17).
(Word 14) Local PLC - Memory Starting Address: Word 14 determines the starting address in the local PLC
from which the data is to be written. 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 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) Remote PLC - Memory Type: Words 15–16 specify the memory type and starting address in the
remote PLC where the data is to be written. Valid values for Word 15 are listed under Establish Read Channel. 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 where the data is to be written. 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 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. The user is responsible for assuring that this area is large enough to contain the
requested data without overwriting other application data. A maximum of 8192 bits, 1024 bytes, or 512 words
of data can be specified.
(Word 18) Remote PLC - Network Address Type: Word 18 specifies the format of the remote PLC address.
Word 18 must contain the value 1, indicates a dotted-decimal IP address expressed using a separate register
for each decimal digit.
(Word 19) Remote PLC - Network Address Length: Word 19 specifies the length in words of the remote PLC IP
address. Word 19 must contain 4.
(Words 20–23) Remote PLC - 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: Words 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.
(Words 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.
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 “MARY” (“M” = 4DH, “A” = 41H, “R” = 52H,
“Y” = 59H) would have 414DH in the first word and 5952H in the second word.