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Relationship between the Operating Modes of the Safety CPU Unit and the
NJ/NX-series CPU Unit
The operating mode of the Safety CPU Unit is independent from the operating mode of the NJ/NX-
series CPU Unit.
This means that changes in the operating mode of the NJ/NX-series CPU Unit will not affect the
operating mode of the
Safety CPU Unit.
Conversely, changes in the operating mode of the Safety CPU Unit will not affect the operating
mode of the NJ/NX-series CPU Unit.
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Restrictions in DEBUG Mode
Safety certification bodies prohibit safety controllers from entering full operational state while forced
refreshing is enabled. Therefore, the Safety CPU Unit imposes the following restrictions.
• You can perform forced refreshing only in DEBUG mode.
• You can change to DEBUG mode only when the Sysmac Studio is online with the Safety CPU
Unit. If an online connection is broken in DEBUG mode, the Safety CPU Unit will automatically
change to PROGRAM mode after 30 seconds elapses.
• Only one copy of the Sysmac Studio can go online with the Safety CPU Unit at the same time.
I/O Data in Each Operating Mode
The following table explains how I/O data is processed, depending on the operating mode of the Safe-
ty CPU Unit.
Not received = Not receive data, Cleared = Clear and reset to initial value, Refreshed = Refresh data
Operating mode
Safety Input
(FSoE/CIP
Safety)
Standard Input
(Exposed Vari-
able)
Safety Out-
put
(FSoE/CIP
Safety)
Standard
Output (Ex-
posed Varia-
ble)
Status (Safe-
ty CPU Sta-
tus)
Initializing Not received
Not received Cleared Cleared Cleared
PROGRAM mode Not received Not received Cleared Cleared Refreshed
RUN mode Refreshed Refreshed Refreshed Refreshed Refreshed
DEBUG
mode
STOPPED Refreshed Refreshed Refreshed Refreshed Refreshed
RUN Refreshed Refreshed Refreshed Refreshed Refreshed
RESTORE mode Not received Not received Cleared Cleared Cleared
7-3-2
Operation When Changing Operating Mode
If you change the operating mode of the Safety CPU Unit, the Safety CPU Unit will operate as shown
in the following table.
Before change → After change Operation
PROGRAM mode → DEBUG mode (STOP-
PED)
• Safety process data communications start.
PROGRAM mode → RUN mode
• Safety process data communications start.
• The variables are initialized and the safety pro-
grams are executed from the beginning.
7 Checking Operation and Actual Operation
7 - 13
NX-series Safety Control Unit User's Manual (Z930)
7-3 Operating Modes of the Safety CPU Unit
7
7-3-2 Operation When Changing Operating Mode
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