Unintended outputs may occur when an error occurs in variable memory. As a counter-
measure for such problems, external safety measures must be provided to ensure safe
operation of the system.
Provide measures in the communications system and user program to ensure safety in
the overall system even if errors or malfunctions occur in data link communications or
remote I/O communications.
The NX-series Controller continues normal operation for a certain period of time when
a momentary power interruption occurs. This means that the NX-series Controller may
receive incorrect signals from external devices that are also affected by the power in-
terruption.
Accordingly, take suitable actions, such as external fail-safe measures and interlock
conditions, to monitor the power supply voltage of the external device as required.
You must take fail-safe measures to ensure safety in the event of incorrect, missing, or
abnormal signals caused by broken signal lines, momentary power interruptions, or
other causes.
Not doing so may result in serious accidents due to incorrect operation.
Voltage and Current Inputs
Make sure that the voltages and currents that are input to the slaves and Units are
within the specified ranges.
Inputting voltages or currents that are outside of the specified ranges may cause acci-
dents or fire.
Downloading
Always confirm safety at the destination before you transfer a user program, configura-
tion data, setup data, or device variables from the Sysmac Studio.
The devices or machines may perform unexpected operation regardless of the operat-
ing mode of the CPU Unit.
Actual Operation
Check the user program, data, and parameter settings for proper execution before you
use them for actual operation.
Safety Precautions
17
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
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