37 FUNCTIONS
607
37
Functions
different
(modified or
restricted) from
Part 2
RAS function Scan
monitoring
function
• During system switching, scan time monitoring with the watchdog timer is
interrupted. Thus, no error is detected even if the scan time monitoring time
has elapsed. Therefore, a time taken for system switching does not need to
be considered in the scan time monitoring time setting.
• Scan time monitoring with the watchdog timer is interrupted while the
standby system is waiting for tracking data reception. Thus, no error is
detected even if the scan time monitoring time has elapsed while the
standby system is waiting for tracking data reception. Therefore, a time
taken for tracking data reception does not need to be considered in the
scan time monitoring time setting.
Self-diagnostic
function
The following items are added to the contents that can be checked with the
system monitor.
• Tracking cable status
• Display of the main base units of systems A and B
• Module configuration on the base unit of the selected system
• Event history of own system
• Systems to which a CPU module belongs (control system/standby system,
system A/B)
GX Works3 Operating
Manual
• The behavior for each setting differs.
• Applicable error codes to relevant parameter settings of the SIL2 Process
CPU are listed in the following chapter.
Page 669 Self-
diagnostic function
The "Instruction Execution Error" setting under the "CPU Module Operation
Setting at Error Detected" is applied only for standard programs. A stop error
always occurs in safety programs. (Even if "Continue" is selected, a stop error
occurs.)
Error clear • Errors that can be cleared are added. Clearing the errors of the SIL2
function module is explained in the following chapter.
• A continuation error that occurred in the own system can be cleared by
using the special relay (SM50) or the connected engineering tool.
• An error on the standby system CPU module can be cleared by using the
special relay (SM1679) of the control system CPU module.
Page 671 Error clear,
Page 673 Clearing
errors on the standby
system CPU module
from the control system
CPU module
Event history
function
Events in the SIL2 Process CPU are added.
Note that events that occur on the SIL2 function module are not retained in
the event history.
Page 790 Event list
Remote
operation
Using a contact 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
When specifying the execution destination at the "Remote Operation" window
of the engineering tool, the specification of all stations or group No. is not
supported, and the CPU module cannot issue the command if being issued
by the own station. All stations or group No. specification is not executed by
the CPU module if those in which all stations or group No. have been
specified are received. Also, if the Safety CPU is in SAFETY MODE when
clearing device/label memory when performing remote RUN, safety global
devices, safety global devices, safety global labels, safety local labels, and
standard/safety shared labels are not cleared.
Page 663 Remote
Operation
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.
Security function The security key setting is written or deleted on both systems individually.
PID control function PID control instructions can be used only in standard programs. MELSEC iQ-R
Programming Manual
(CPU Module
Instructions, Standard
Functions/Function
Blocks)
Function Description Reference
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