3 - 13
3 Memory Allocations
CJ-series EtherCAT Slave Units Operation Manual (W541)
3-3 DM Area Allocations
3
3-3-2 Details of the Allocated DM Area Words
Precautions for Correct Use
• A Unit restart is required after I/O communication allocations are changed or set to enable
the new settings.
• If the user sets both IN and OUT data area sizes to zero or the I/O allocation settings are
invalid, the Unit will be in the Pre-Operational state and cannot perform process data com-
munications with the EtherCAT master.
• Select valid areas in the CPU Unit that do not interfere or overlap with another memory area
that is already in use. Also ensure the size of the area is within a valid memory area by prop-
erly setting the first word and size values for the memory type selected. Otherwise, an incor-
rect area setting result will occur.
• EM memory area availability and size vary depending on the CPU Unit series and model
type. Refer to the operation manuals of the CPU Units for details on the EM memory area
specification.
Refer to this area for the I/O communications area settings established in the EtherCAT Slave Unit.
I/O Communication Area Reference Table
Offset
Bit
Reserved
15
8
7
0
OUT data area type
First word in OUT data area
m + 7
m + 8
OUT data area size (byte)
Reserved
First word in IN data area
IN data area size (byte)
IN data area type
m + 9
m + 10
m + 11
m + 12
To Next Page
Loading...
Need help?
General
