2-27
2 CPU Unit Operation
NJ-series CPU Unit Software User’s Manual (W501)
2-6 Operation for CPU Unit Status
2
2-6-2 Operation for CPU Unit Status
Changes in the status of the CPU Unit affect user program execution, I/O refreshing, and the operation
of external communications. The following table shows how each process operates in startup state and
during normal operation.
Refer to 12-1-3 Non-fatal error in CPU Unit for information on the error state.
*1 Only the input values are refreshed.
*2 The tag data links remain in effect, but the values of those links are not refreshed. The output tags retain the
values from before the download was started. The values in the input tags are not reflected in the variables.
Values of Outputs in I/O Refreshing
The following table shows the values of the outputs in each state after I/O refresh processing.
*1 Refer to the manual for each slave for information on the slave settings that apply until EtherCAT communi-
cations starts after the power supply is turned ON.
*2 When the download is completed, initialization of the EtherCAT slaves starts. When initialization is in prog-
ress, the outputs reflect the settings for the slave.
*3 When the download is completed and when the operating mode is changed: the values in the device vari-
ables for CJ-series Units are initialized to the values of the Initial Value attributes.
Refer to 6-3-8 Variable Attributes for information on the Initial Value attribute for variables.
2-6-2 Operation for CPU Unit Status
CPU Unit process-
ing
Operation dur-
ing execution
Operation during normal operation
PROGRAM
mode
RUN mode Downloading
User program Stopped. Stopped. Executed. Stopped.
I/O Refreshing for
EtherCAT slaves
Stopped. Executed. EtherCAT communications
changes to safe-operational
state. *1
I/O Refreshing for CJ-
series Units
Stopped. Executed.
External communica-
tions
Stopped. Executed. Executed. *2
Outputs
Operation dur-
ing startup
Operation during normal operation
PROGRAM
mode
RUN mode Downloading
Outputs from Ether-
CAT slaves
Controlled by the
slave settings. *1
The outputs have the values
of the device variables for
EtherCAT slaves. *2
Controlled by the slave set-
tings.
Outputs from CJ-
series Basic Output
Units
Turned OFF. The output have the values of the device variables for CJ-series
Units. *3
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