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35 BASIC CONCEPT
35.4 Operation Mode of the SIL2 Process CPU
35.4
Operation Mode of the SIL2 Process CPU
This mode determines the operation of the SIL2 Process CPU and is fixed to redundant mode
*1
. (
*1 Use this mode when a redundant system is built.
35.5
Operation Modes of the System
This mode determines the operation of the system and is fixed to backup mode.
35.6
Safety Operation Mode
There are two safety operation modes: TEST MODE and SAFETY MODE. Running normally as a safety system or changing
a safety program and safety parameters can be selected.
*1 The same restrictions apply to this mode as those for SAFETY MODE.
Checking the safety operation mode
The safety operation mode can be checked in the following ways.
• TEST LED of the SIL2 function module (
MELSEC iQ-R CPU Module User's Manual (Startup))
• "Safety Operation Mode Switch" window of the engineering tool (
GX Works3 Operating Manual)
• Module information list of the engineering tool (
GX Works3 Operating Manual)
• Safety special register of the SIL2 Process CPU (SA\SD205) (
Page 885 List of Safety Special Register Areas)
Operation mode
Description
Backup mode
When an error or failure has occurred in the control system, the standby system is switched to the control system to
continue the operation. Even if a system failure has occurred in the control system, the standby system continues the
operation because data is transferred from the control system to the standby system at every scan.
Safety operation mode
Description
SAFETY MODE
Mode for operating the safety system controlled by the SIL2 Process CPU.
In this mode, safety programs and safety parameters of the SIL2 Process CPU cannot be changed. Only device data
values in safety programs can be changed.
TEST MODE
Mode for performing maintenance (such as setting changes and tests) of the safety system controlled by the SIL2
Process CPU.
In this mode, safety programs and safety parameters of the SIL2 Process CPU can be changed. Device data can be
changed by performing a device test.
SAFETY MODE (wait-for-restart)
The system switches to this mode during the period of time from immediately after safety operation mode is changed
from TEST MODE into SAFETY MODE until the CPU module is powered off or is reset. Even if safety operation mode
is switched to SAFETY MODE, safety operation mode remains in this mode until the CPU module is powered off and
on or is reset. Programs are not executed in this mode. An error occurs if the CPU module is in the RUN state.
Содержание MELSEC iQ-R-R00CPU
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Страница 151: ...9 MONITOR FUNCTION 9 1 Real Time Monitor Function 149 9 MEMO ...
Страница 323: ...18 SEQUENCE SCAN SYNCHRONIZATION SAMPLING FUNCTION 321 18 MEMO ...
Страница 330: ...328 20 ROUTING SETTING 20 3 Precautions MEMO ...
Страница 423: ...26 BASIC CONCEPT 26 8 State Transition of the Redundant System 421 26 MEMO ...
Страница 524: ...522 30 MAINTENANCE AND INSPECTION FOR A REDUNDANT SYSTEM 30 1 Module Replacement in the Redundant System MEMO ...
Страница 1009: ...APPX Appendix 14 List of Available SQL Commands for CPU Module Database Access Function 1007 A MEMO ...
Страница 1014: ...1012 APPX Appendix 15 Added and Enhanced Functions MEMO ...
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