Omron CQM1H-CLK21 - Manual (Page 209)

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Selecting Communications Instructions Section 6-2
Note 1. SR 253 to SR 255 cannot be written at the source node, even if they are
specified by the RECV instruction’s beginning receive word at the source
node.
2. For details on extended DM Area, refer to the operation manual for the PLC
model that is being used.
6-2 Selecting Communications Instructions
Note CMND cannot be used with C200HX/HG/HE PLCs.
DM Area DM 0000 to DM 6655
Extended DM Area EM 0000 to EM 6143 (See note 2.)
Area Range
Do you want to easily read from
or write to the I/O memory area?
Do you want to intermittently read
from a memory area?
Aside from memory areas, do you
want to write the following kinds of
data?
PLC internal clock
File Memory
Do you want to read the following
kinds of data?
PLC model
PLC status
Cycle time
Messages
Errors
Forced set/reset status
Do you want to change the PLC's
operating mode?
Do you want to force set/reset bit
status?
Use SEND and RECV.
YES
Use CMND. (See note.)
YES
YES
YES
YES