33 FUNCTIONS
33.1 Safety Operation Mode
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33.1 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 parameter 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 three ways.
• TEST LED of the safety 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 Safety CPU (SA\SD205) ( Page 885 List of Safety Special Register Areas)
Function different
(modified or
restricted) from the
standard CPU
PID control function The PID control instructions cannot be used in safety
programs.
MELSEC iQ-R
Programming Manual
(CPU Module
Instructions, Standard
Functions/Function
Blocks)
Multiple CPU
system function
Data
communications
between CPU
modules
The Safety CPU supports only data communications using
the CPU buffer memory. Data communications using the fixed
scan communication area is not supported. The data
communications using the fixed scan communication area is
available between the CPU modules other than the Safety
CPU.
Multiple CPU
synchronous
interrupt
Multiple CPU synchronous interrupt (I45) is not supported
since the execution of safety programs is prioritized.
Latch function Safety devices, safety labels, and standard/safety shared
labels cannot be latched.
Device/label initial value setting An initial value cannot be set for safety global devices, safety
local devices, safety global labels, safety local labels, and
standard/safety shared labels. To set an initial value to those
devices and labels, create a program so that the safety state
can be secured and the value is set only at the start-up.
Device/label access service processing
setting
Even though this function is set, the scan time of some
functions (operations) becomes longer than the specified
time. The following are added to those functions.
• Safety local devices (label) batch/registration monitor
• Current value change of the safety labels/safety devices
• Switching safety operation mode
• Safety data identify check
SLMP communication function Safety devices cannot be accessed. Also, the command
execution status differs.
Page 532 File operation
available
Ethernet function File transfer
function (FTP
server)
Safety operation mode Description
SAFETY MODE This is a mode for operating the safety system controlled by the Safety CPU.
In this mode, Safety CPU safety programs and safety parameters cannot be changed. Only device data values in safety
programs can be changed.
TEST MODE This is a mode for performing maintenance (such as setting changes and tests) of the safety system controlled by the
Safety CPU.
In this mode, Safety CPU safety programs and safety parameters can be changed. Device data can be changed by
performing a device test.
SAFETY MODE (wait-for-restart)
*1
The system switches to this mode during the period from immediately after safety operation mode is changed to
SAFETY MODE when in TEST MODE until the CPU module is turned off or is reset. Even if safety operation mode is
switched to SAFETY MODE, safety operation mode becomes this mode until the CPU module is powered on or is
reset. Programs are not executed in this mode. An error occurs if the CPU module is the RUN state.
Function Description Reference
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