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99
Sending Commands from a PLC Section 7-2
Writing Programs Programs incorporating the SEND(090), RECV(098), and CMND(490)
instructions are generally created using the Communications Port Enabled
Flag and the Communications Port Error Flag as input conditions. CS/CJ-
series CPU Units have eight communications ports. Only one instruction can
be executed at any given port at one time, however, so the program must not
overlap the use of any of the ports. A program example is provided below.
Note CS1-H, CJ1-H CJ1M, or CS1D CPU Units (for independent CPU systems)
with lot numbers 020601 (manufactured on June 1, 2002 or later) can auto-
matically detect an available communications port. For details, refer to the
automatic communications port allocations for network communications
instructions in the
SYSMAC CS/CJ Series Communications Commands Ref-
erence Manual (W342).
File memory 22 01 FILE NAME READ Reads file memory data.
22 02 SINGLE FILE READ Reads a specified length of file data
from a specified position within a single
file.
22 03 SINGLE FILE WRITE Writes a specified length of file data
from a specified position within a single
file.
22 04 FILE MEMORY FORMAT Formats (initializes) the file memory.
22 05 FILE DELETE Deletes specified files stored in the file
memory.
22 07 FILE COPY Copies files from one file memory to
another file memory in the same sys-
tem.
22 08 FILE NAME CHANGE Changes a file name.
22 0A MEMORY AREA–FILE TRANSFER Transfers or compares data between the
I/O memory area and the file memory.
22 0B PARAMETER AREA–FILE TRANSFER Transfers or compares data between the
parameter area and the file memory.
22 0C PROGRAM AREA–FILE TRANSFER Transfers or compares data between the
UM (User Memory) area and the file
memory.
22 15 CREATE/DELETE DIRECTORY Creates or deletes a directory.
Debugging 23 01 FORCED SET/RESET Force-sets or force-resets bits, or
releases force-set status.
23 02 FORCED SET/RESET CANCEL Cancels all bits that have been force-set
or force-reset.
Usage Command
code
Name Function
MR SR