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15
Safety Precautions
NJ-series NJ Robotics CPU Unit User’s Manual (W539)
Warnings
During Power Supply
Do not touch any of the terminals or terminal blocks while the power is being supplied.
Doing so may result in electric shock.
Do not disassemble any of the Units.
Particularly the power-supplied Units contain parts with high voltages while power is sup-
plied or immediately after power is turned OFF. Touching any of these parts may result in
electric shock. There are sharp parts inside the Units that may cause injury.
Fail-safe Measures
Provide safety measures in external circuits to ensure safety in the system if an abnormality
occurs due to malfunction of the CPU Unit, other Units, or slaves or due to other external
factors affecting operation.
Not doing so may result in serious accidents due to incorrect operation.
Emergency stop circuits, interlock circuits, limit circuits, and similar safety measures must
be provided in external control circuits.
The Controller outputs may remain ON or OFF due to deposition or burning of the output
relays or destruction of the output transistors. As a countermeasure for such problems,
external safety measures must be provided to ensure safe operation of the system.
The CPU Unit will turn OFF all outputs from Basic Output Units in the following cases.
• If an error occurs in the power supply
• If the power supply connection becomes faulty
• If a CPU watchdog timer error or CPU reset occurs
• If a major fault level Controller error occurs
• While the CPU Unit is on standby until RUN mode is entered after the power is turned
ON.
Provide external safety measures so that the system operates safely if all outputs turn OFF
when any of the above conditions occurs.
If external power supplies for slaves or other devices are overloaded or short-circuited, the
voltage will drop, outputs will turn OFF, and the system may be unable to read inputs. Pro-
vide external safety measures in controls with monitoring of external power supply voltage
as required so that the system operates safely in such a case.
Unintended outputs may occur when an error occurs in variable memory or in memory used
for CJ-series Units. As a countermeasure 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.
WARNING
Summary of Contents for NJ501-4300
Page 13: ...11 CONTENTS NJ series NJ Robotics CPU Unit User s Manual W539 ...
Page 40: ...Revision History 38 NJ series NJ Robotics CPU Unit User s Manual W539 ...
Page 90: ...2 Features of NJ Robotics CPU Unit 2 40 NJ series NJ Robotics CPU Unit User s Manual W539 ...
Page 204: ...5 Vision Robot Integrated Simulation 5 6 NJ series NJ Robotics CPU Unit User s Manual W539 ...
Page 308: ...6 Troubleshooting 6 104 NJ series NJ Robotics CPU Unit User s Manual W539 ...
Page 333: ...I 1 I NJ series NJ Robotics CPU Unit User s Manual W539 Index ...
Page 335: ......