Omron CJ2 CPU - REV 10-2010 User Manual page 474

12 CPU Unit Cycle Time
4. I/O Refreshing
Basic I/O Units
Special I/O
Units
CPU Bus Units
5. Peripheral Servicing
The following peripheral device servicing is supported.
• Servicing for Communications Ports (Internal Logic Ports)
Servicing for communications ports is performed when communications instructions in the ladder
program or functions such as background execution or simple backup are used.
• Event Servicing for Special I/O Units or CPU Bus Units
Event servicing is performed whenever a Unit is connected in the PLC. It is also performed in situ-
ations such as when Support Software is used via a Communications Unit.
• USB Port Servicing
USB port servicing is performed when a USB port is being used.
• RS-232C Port Servicing
RS-232C port servicing is performed when an RS-232C port is being used.
• File Access Servicing
File access servicing is performed when a Memory Card or EM file memory is accessed.
• Online Edit Servicing
Online edit servicing is performed when online editing is executed.
• Backup Servicing
Backup servicing is performed when programs or parameters are changed.
When Peripheral Device servicing is not performed, no time is required for processing. The mini-
mum and maximum processing times for Peripheral Device servicing depend on the Set Time to All
Events parameter in the PLC Setup, as shown in the following table.
Set Time to All Events
parameter
12-6
Details
Basic I/O Units are refreshed. Outputs from the CPU Unit to the
Output Units are refreshed first for each Unit, followed by inputs
from the Input Units to the CPU Unit.
Words allocated in CIO Area
Unit-specific Example: CompoBus/S remote I/O
data
Words allocated in CIO and DM Areas
Unit-specific Examples:
data
• EtherNet/IP tag data link refreshing
• Controller Link data link refreshing
• DeviceNet remote I/O communications
• Send/receive data for protocol macros
• Socket services for specific control bits for
Ethernet Units
0 ms (when servicing not exe-
Disable cuted)
Enabled
Processing time and fluc-
I/O refresh time for each Unit
multiplied by the number of
Units used.
I/O refresh time for each Unit
multiplied by the number of
Units used.
I/O refresh time for each Unit
multiplied by the number of
Units used.
Peripheral service execution time
Minimum
10% of cycle time (or 0.1 ms if
10% of the cycle time is less
than 0.1 ms)
Set time (0.1 to 3,276.7 ms)
CJ2 CPU Unit Software User's Manual
tuation cause
Maximum