Omron Sysmac NJ-series User Manual

Appendices
A-64
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
A-6 Precautions When Accessing
External Outputs in CPU Units
Observe the following precautions when you access variables or I/O memory addresses that are
assigned to external outputs in an NJ/NX-series CPU Unit.
 Precaution on Writing from External Devices, Variables* That Are Assigned to
External Outputs
Any value that is written to a variable* that is assigned to an external output in an NJ/NX-series CPU
Unit through a tag data link or communications instruction will be overwritten by the execution
results of the user program. The value that is written from the tag data link or communications
instruction will therefore not be output to the external device.
The following types of variable are assigned to the external outputs.
(1) CPU Unit Common
• The devices variables (or global variables) that are assigned to an I/O port of an Ether-
CAT output slave
(2) NJ-series CPU Unit
• The devices variables (or global variables) that are assigned to an I/O port of a CJ-series
Basic Output Unit
• The global variables with AT specifications to output bits that are assigned to CJ-series
Basic Output Units
(3) NX1P2 CPU Unit
• The global variables with AT specifications to the memory used for CJ-series Units, of
which Network Publish attributes are set to output
 Precaution When Directly Writing to I/O Memory Addresses Assigned to
Output Bits for CJ-series Basic Output Units
Any value that is written to an I/O memory address that corresponds to an output bit that is assigned
to a CJ-series Basic Output Unit through a tag data link will be overwritten by the execution results
of the user program. The value that is written directly to the I/O memory address from the tag data
link will therefore not be output to the external device.

Omron Sysmac NJ-series Specifications

General

Brand	Omron
Model	Sysmac NJ-series
Category	Computer Hardware
Language	English