Fixed Scan Function Information - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Fixed scan function information

The following is the list of special relay areas relating to the fixed scan function information.
No. Name
SM480 Cycle error flag for inter-
module synchronous
interrupt program (I44)
SM481 Cycle error flag for multiple
CPU synchronization
interrupt program (I45)
SM484 Execution section excess
error flag for multiple CPU
synchronization interrupt
program
SM488 Inter-module
synchronization error (out of
synchronization was
detected on the CPU
module)
*1 There are restrictions on the firmware version of the supported CPU module and software version of the engineering tool. ( Page
1008 Added and Enhanced Functions)
Data stored Details
Off: No error for the inter- • This relay switches to on when the inter-
module module synchronous interrupt program
synchronization (I44) has not been completed within the
program (Normal) specified inter-module synchronization
On: Error state for the cycle or the program cannot be executed
inter-module due to various reasons, such as
synchronization execution of a higher-priority interrupt
program program and interrupt disabling by the
instruction execution.
• The ON state is maintained even after the
program is later completed within the
specified inter-module synchronization
cycle (Clear by turning power off and on
or resetting).
Off: No error for the • This relay switches to on when the
multiple CPU multiple CPU synchronization program
synchronization (I45) has not been completed within the
program (Normal) specified fixed scan communication cycle
On: Error state for the or the program cannot be executed due to
multiple CPU various reasons, such as execution of a
synchronization higher-priority interrupt program and
program interrupt disabling by the instruction
execution.
• The ON state is maintained even after the
program is later completed within the
specified fixed scan communication cycle
(Clear by turning power off and on or
resetting).
Off: No execution section • This relay switches to on when the
excess error for the program is executed exceeding the
multiple CPU program execution section within the
synchronization specified multiple CPU synchronization
interrupt program cycle.
(Normal) • The ON state is maintained even after the
On: Execution section program is later completed within the
excess error state for multiple CPU synchronous interrupt
the multiple CPU program execution section (cleared by
synchronization turning power off and on or resetting).
interrupt program
Off: No error (Normal) • This relay switches to on when the inter-
On: Error module synchronization signal cannot be
identified within the inter-module
synchronization cycle specified in the
parameter or more than one signal has
been identified within the same inter-
module synchronization cycle.
• The ON state is maintained even after the
inter-module synchronization signal can
be later identified within the specified
inter-module synchronization cycle
(cleared by turning power off and on or
resetting).
Set by (setting timing) CPU
S (Status change)
S (Status change)
S (Status change)
S (Status change)
Appendix 4 List of Special Relay Areas
Rn
RnP
*1
Rn
RnP
RnSF
*1
Rn
RnP
A
RnSF
Rn
RnP
APPX
813