I/O Communication Area Reference Table - Omron CJ1W-ECT21 Operation Manual

3 Data Exchange with the CPU Unit
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 commu-
nications 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.
3-3-3

I/O Communication Area Reference Table

This section describes the device variables for the I/O Communication Area Reference Table.
OUT Data Area Type
Use this device variable to refer to the output word data area type that is allocated for sending data to
the EtherCAT master (RxPDO).
Name of device variable
for CJ-series Unit
*_RefOutAreaType
*1. Expansion Data Memory (EM) areas vary for NJ-series CPU Unit models. Check the NJ-series CPU Unit spec-
ifications for bank availability.
 Reference Memory Area Codes for the EtherCAT Slave Unit OUT Data Area
Code
16#00
16#01
16#03
16#04
16#05
16#08 to 14
*1. Expansion Data Memory (EM) areas vary for NJ-series CPU Unit models. Check the NJ-series CPU Unit spec-
ifications for bank availability.
3 - 24
Type R/W
BYTE R
Area type in memory for CJ-series Unit
---
CIO Area (CIO)
Data Memory (DM)
Work Area (WR)
Holding Area (HR)
Expansion Data Memory (EM)
*1
Bank 0 to Bank C
CJ-series EtherCAT Slave Units Operation Manual for NJ-series CPU Unit (W542)
Name
OUT data area type References the OUT data area
memory type.
Data range: 16#00 to 14
Default: 16#00
Function
*1