Omron NJ-series User Manual page 68

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