Table of Contents
Advertisement
3.2 I/O Refresh (Refresh Processing with Input/Output Modules)
The CPU module performs the following before sequence program operations.
• On/off data input from the input module or intelligent function module to the CPU module
• On/off data output from the CPU module to the output module or intelligent function module
When the constant scan time is set, I/O refresh is performed after the constant scan waiting time has
elapsed. (I/O refresh is performed at each constant scan cycle.)
3.3 Program Operation
The CPU module sequentially executes the program stored in the module from the step 0 to the END or
FEND instruction.
3.4 END Processing
The CPU module performs refresh processing with network modules and communication with external
devices.
END processing includes the following.
• Refresh with network modules (
•
Auto refresh with intelligent function module
• Intelligent function module dedicated instruction processing (
• Device data latch processing (
• Service processing (
• Watchdog timer reset (
• Auto refresh between multiple CPU modules (
• Device data collection using the sampling trace function (only when trace point is set to every scan (after
END instruction execution)) (
• Self-diagnostics processing (
• Special relay/special register value setting (only for those that should be set during END processing)
(
CHAPTER 12)
When the constant scan function (
END processing are held for the period between after END processing is completed and until the
next scan starts.
CHAPTER 10)
(
Section 7.1.1)
Section 6.3, CHAPTER 10)
Section 6.24, CHAPTER 10)
Section 6.16)
QCPU Userís Manual (Multiple CPU System))
Section 6.14)
Section 6.17)
Section 6.2) is used, the results of processing performed in
CHAPTER3 CPU MODULE OPERATION
CHAPTER 10)
1
2
3
4
5
6
7
8
3 - 2
Advertisement
Table of Contents
