Mitsubishi Electric MELSEC iQ-R-R00CPU, User Manual

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