Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 608

Function
Functions Constant scan
different
(modified or
restricted) from
Part 2
Output mode setting of STOP to
RUN
Interrupt
function
Clock
function
Writing data
to the CPU
module
37 FUNCTIONS
606
Description
• In the standby system, system switching when the system is powered off, a
hardware failure has occurred, or a tracking cable has a failure may
generate a continuation error due to the excess of constant scan time.
• The constant scan function is invalid for the standby system.
The safety output (SA\Y) for the safety output device (SA\Y) is off, regardless
of this setting. If the value is changed with a device test or others while the
CPU module is in the STOP state, the value will be applied when the status of
the CPU module changes from STOP  RUN.
Internal timer When the systems are switched during time measurement of I28 to I31, the
interrupt time measurement is interrupted and the new control system starts the time
measurement from 0.
Interrupt period The interrupt pointer (I) cannot be used in safety programs. Also, the following
setting cannot be used in standard programs.
• Inter-module synchronous interrupt (I44)
• Multiple CPU synchronous interrupt (I45)
• High-speed internal timer interrupts (I48, I49)
Multiple Safety cycle processing is performed as a higher priority interrupt than other
interrupt processing, and therefore even when set to "Enable" in the multiple interrupt
function settings, interrupts will never occur during safety cycle processing.
Clock setting When setting clock data for the Safety CPU at the "Set Clock" window of the
engineering tool, "All Stations Specified" cannot be selected as an execution
target.
Time The time of the standby system is synchronized with the time of the control
synchronization system. The time setting using the time setting function (SNTP client) is
available only for the control system.
System clock After system switching, SM420 (User timing clock No.0) to SM424 (User
timing clock No.4) remain off on the new control system CPU module.
To use SM420 to SM424 on the new control system CPU module, execute
the DUTY instruction again.
Online change • When the online change (ladder block) is performed on the CPU module in
(ladder block) one system, the change is also reflected on the CPU module in the other
system.
• Online changes (ladder block) are not possible in safety programs.
• Safety program files, safety global label setting files, and standard/safety
shared global label setting files cannot be changed online. However, if
standard/safety shared labels inside standard programs are edited,
standard programs can be changed online.
• If a disconnection, power-off, or reset of the CPU module is detected while
the program restoration information is being written, the processing will be
suspended and a message will be displayed. If the processing is
suspended by a disconnection, click the [Retry] button in the message after
reconnecting cables. If the processing is suspended by power-off or reset,
login to the user authentication function is disabled. Log in to the function
and write data again to the programmable controller.
Reference
Page 662 Constant Scan
Page 676 Safety output
(SA\Y)
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MELSEC iQ-R CPU
Module User's Manual
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