User Manual PLC-3 BACKUP CONC(OR.DU1 Owner's manual

Using the 1775MX
Memory Communication Module
Chapter 4
4-6
The MCM OPERATION menu contains an entry for each LIST function
listed in Table 4.D. These functions are a subset of those available when
using message instructions.
Table 4.D
LIST
Functions
Command Description
INACTIVE The memory communication module stops both continuous
data transfers and continuous file transfers to the backup
processor.
FILE TRANSFER The memory communication module transfers the selected
files from the primary to the backup processor continuously.
FILE SELECTION Lets you select up to 16 files for use with the file transfer
function.
DATA TABLE XFER The memory communication module continuously transfers
the entire data table, except the data table status section,
from the primary to the backup processor.
MEMORY DOWNLOAD The memory communication module stops any data transfer
in progress and transfers the entire contents of PLC3
memory from the primary to the backup processor.
LOCK SYSTEM The memory communication module has the edit resource
for both the primary and backup processors. This protects
the ladder program in the current context from being edited
while in the run or test mode.
UNLOCK SYSTEM The memory communication module releases the edit
resource for both the primary and backup processors.
ENABLE PROG COMP The memory communication module compares the ladder
diagram program in the backup processor with the one in the
primary processor on a wordbyword basis.
DISABLE PROG COMP The memory communication module prevents the execution
of the program compare function.
PROG COMP LIMITS Lets you select specific sections of the ladder program to be
compared when ENABLE PROG COMP has been
selected.
BACKUP TO PRIMARY
DATA TRANSFER
Lets you transfer up to 16 words from the backup to the
primary processor.
The following sections describe each LIST command in detail.