28 FUNCTIONS
437
28
Functions different
(modified or
restricted) from
those of the process
mode
Remote operation Using a contact When the backup mode setting is enabled in the CPU
parameter, both systems may be recognized as being
mismatched in the system consistency check even if the
remote operation is simultaneously performed on the systems
because their operating statuses are mismatched depending
on the timing.
Using an
engineering tool
In a redundant system, the operation target of remote
operations depends on the operation mode and type.
Page 491 Remote
Operation
Boot operation Use the boot operation only to simultaneously start up both
systems. When one system is restarted and the boot
operation is used, an error occurs.
Page 493 Boot
Operation
External input/output forced on/off function Forced on/off is reflected to the input/output devices of both
systems and external outputs by registering or canceling
forced on/off for the control system. (Forced on/off is reflected
to both systems without setting tracking transfer setting in the
CPU parameter.)
Page 494 External Input/
Output Forced On/Off
Function
Test function Changes in values of devices and labels are transferred
(tracking) from the control system to the standby system
before the END processing. If the systems are switched
between the change and the tracking transfer, the change is
not reflected on the new control system.
Data logging function In a redundant system, the data logging function collects data
only in the control system regardless of the operation mode.
Page 498 Data Logging
Function
Multiple CPU system function This function cannot be used in redundant mode.
Security function The security key setting is written or deleted on both systems
individually, regardless of the operation mode.
Latch function When the systems are switched, the new control system and
the new standby system start the value in "Interval Setting at
Time Setting" in "Device Latch Interval Setting" from 0.
Label access setting from external device In the transfer setup of external devices that communicate
with the CPU module through GOT, SLMP, or other methods,
select "Control System/Standby System", "System A/System
B", or "Not Specified" to start a communication with a global
label name specified.
Program restoration information write
selection
Only when the firmware versions of the CPU modules of both
systems support the program restoration information write
selection, "Not to Write" can be selected.
Page 1008 Added and
Enhanced Functions
SFC function This function cannot be used in redundant mode.
SLMP communication • There are notes for system switching when the system IP
address matching function is not used.
• If a remote operation command is executed, the CPU
modules enter different operating statuses and thus
systems cannot be switched.
• For SLMP communications via the built-in Ethernet port of
the CPU module, when communications are performed to
the other system that cannot respond (power-off, reset, or
tracking cable disconnection), a timeout error may occur.
• The SLMP frame send instruction (SP.SLMPSND) performs
communications using IP addresses of the system A and B.
Page 501 SLMP
Communication
Ethernet function File transfer
function (FTP client)
• This function performs communications using IP addresses
of the system A and B.
MELSEC iQ-R Ethernet
User's Manual
(Application)
Inter-module synchronization function This function cannot be used in redundant mode.
Function Description Reference
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