2-9
2 CPU Unit Operation
NJ-series CPU Unit Software User’s Manual (W501)
2-2 Software
2
2-2-2 Operation of Software
System Services
System services include the following processing.
* The CPU Unit exchanges data between CJ-series Special Units and the memory words that are allocated to
them during I/O refreshing.
System Service Operations
If a request comes from the hardware or from outside of the CPU Unit, system services are exe-
cuted during the unused time between the execution of all tasks.
Refer to Processing Performed in System Services on page 5-29 for details on the system services.
System Services
Processing Contents
USB port service • Processing of service requests from the Sysmac Studio or host comput-
ers
Built-in EtherNet/IP port service • Processing of message service requests, such as CIP commands, from
the Sysmac Studio, an HMI, host computers, or other Controllers
• Execution of communications instructions for CIP and socket communi-
cations
Built-in EtherCAT port service • Execution of EtherCAT message communications
CJ-series Special Unit service
*
• Event servicing for CJ-series Special Units
• Execution of communications instructions (CIP)
SD Memory Card service • Access from FTP client
• SD Memory Card operations from the Sysmac Studio
• Execution of SD Memory Card instructions
Self-diagnosis • Hardware error detection
Task
Task period of primary
periodic task
Task Task
Task
Task
Primary
periodic task
Periodic task
System
services
Task
Task
Task
The system service is executed during unused time between
the execution of all tasks.
Interrupted. Interrupted.
Task period of primary
periodic task
Task period of primary
periodic task
Task period of primary
periodic task
Task period of periodic task Task period of periodic task
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