Operation For Cpu Unit Status; Cpu Unit Status - Omron NJ-series User Manual

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Operation for CPU Unit Status

This section describes the processing that is performed for user program execution, I/O refreshing, and
external communications according to the status of the CPU Unit. It also describes the operating modes
that change the execution status of the user program when the CPU Unit is in the normal operation
state.
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CPU Unit Status

The CPU Unit can be in any of three states: startup state, normal operation state, or error state. These
states are defined as follows:
State
Startup state
Normal operation
Error state
The normal operation state has these three states for operation: PROGRAM mode, RUN mode, and
downloading. A CPU Unit in the normal operation state changes to the other states due to user interac-
tion. This status is defined as follows:
State
PROGRAM mode
RUN mode
Downloading
Note Refer to 2-6-3 Operating Modes for details on PROGRAM mode and RUN mode.
 CPU Unit status
The CPU Unit enters the startup state after the power supply is turned ON. About 10 to 20 seconds
after the CPU Unit enters the startup state, software processing begins and the CPU Unit changes
to normal operation. If a Controller error occurs during normal operation, the CPU Unit changes to
the error state. When you reset the Controller error, the CPU Unit returns to normal operation.
NJ-series CPU Unit Software User's Manual (W501)
The software is initializing the system.
The software is executing processing for instructions that are executed in a task or it is exe-
cuting a system service. A Controller error has not occurred.
A Controller error occurred when the software was executing processing for instructions
that are executed in a task or it was executing a system service.
The operating mode is PROGRAM mode.
The operating mode is RUN mode.
Data is being downloaded from the Sysmac Studio.
2 CPU Unit Operation
Definition
Definition
2
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