Both Systems Operations After System Switching - Mitsubishi Q12PRHCPU User Manual

5
REDUNDANT SYSTEM FUNCTIONS

5.3.4 Both Systems Operations After System Switching

Table5.36 and Table5.37 indicates the CPU module and network module operations after
system switching is performed.
(1) CPU Module Operations
Table5.36 Control System and Standby System CPU Module Operation After System Switching
Item
Initial Execution
Type Program
Scan Execution
Type Program
Program
Fixed Scan
*1
Execution
Execution Type
Program
Standby Type
Program
Interrupt
Program
Tracking
Online Program Change
Writing files in RUN
General Data Processing
Device Memory
Signal Flow Memory
Initial Device Value Setting
Special Relays and Special
Registers
Output (Y)
Local Device Settings
File Register Settings
Direct Input (DX)
Direct Output (DY)
Intelligent Function Module
Dedicated Instruction
FROM/TO Instruction
Access Request from Intelligent
Function Module
5
- 51 5.3 The System Switching Function
5.3.4 Both Systems Operations After System Switching
New Control System CPU Module
Does not execute the program.
However, executes the initial execution type program from the
0 step again, if it was not completed in the previous control
system at the time of system switching.
Executes scan execution type program based on the tracked
device data from step 0.
Starts counting the interrupt interval time from 0. (Refer to
Section 7.2)
Not executed.
Executes when the interrupt factor is established. (Refer to
Section 7.2)
Starts tracking to the new standby system.
Continues the write operation after system switching.
Continues the write operation after system switching.
Executes the request received after system switching.
Holds the data.
Holds the tracked data.
Turns ON signal flow memory in all steps if has not been
tracked.
Stores the execution results in the signal flow memory, after
program execution.
Does not set the value.
Holds the data.
However, stores the statuses of control system and standby
system after system switching in SM1515 and SM1516.
Holds the output.
Outputs program execution results.
Sets devices according to parameter settings.
Holds the file register settings prior to system switching.
Takes in (X) from the input module when executing the direct
input instruction in a program after system switching.
Outputs (Y) to the output module when executing the direct
output instruction in a program after switching.
Executes the instruction in a program after system switching if
the corresponding execution condition has been satisfied, and
does not execute it if it has not been satisfied.
Executes the instruction in a program after system switching if
the corresponding execution condition has been satisfied, and
does not execute if it has not been satisfied.
Ignores the access request.
* 1: The redundant CPU cannot execute the low speed execution type programs.
New Standby System CPU Module
Stops program execution.
Starts reception of tracking data.
However, stops the reception of tracking data if a stop error
has occurred.
Continues the write operation after system switching.
Continues the write operation after system switching.
Executes the request received at time of system switching.
However, may develope a communication error if a system
switching is executed during general data processing.
Holds the data.
Sets the received tracking data to specified device.
Holds the data
Sets the received tracking data in the signal flow memory.
Does not process it.
Holds the data.
However, stores the statuses of control system and standby
system after system switching in SM1515 and SM1516.
Sets the received tracking data in the corresponding special
relay and special register.
Turns OFF the output (Y) from modules mounted on the
main base unit.
Holds the output (Y) from modules other than above.
Does not process it.
Not processed.
Not processed.
Not processed.
Not processed.
Not processed.
Not processed.