• Make sure that the voltages and currents that are input to the Units and slaves are within the speci-
fied ranges. Inputting voltages or currents that are outside of the specified ranges may damage the
Units or slaves or cause fire.
Actual Operation
• The relevant Units will maintain the safe states for I/O data with safety connections after an error is
detected in safety process data communications. However, when the cause of the error is removed,
safety process data communications will recover automatically.
If you need to prevent equipment from restarting when safety process data communications recover
automatically, implement suitable restart conditions in the user program.
Turning OFF the Power Supply
• Do not disconnect the cable or turn OFF the power supply to the Controller or a Slave Terminal
when downloading data or the user program from the Support Software.
• Always turn OFF the external power supply to the Units before attempting any of the following.
a) Mounting or removing an NX Unit.
b) Assembling Units
c) Setting DIP switches or rotary switches
d) Connecting or wiring cables
e) Attaching or removing terminal blocks or connectors
The Power Supply Unit may continue to supply power to the Controller for a few seconds after the
power supply turns OFF. The UNIT PWR and I/O PWR indicators are lit during this time. Confirm
that the UNIT PWR and the I/O PWR indicators are not lit before you perform any of the above ac-
tions.
General Communications
• Do not exceed the ranges that are given in the specifications for the communications distance and
number of connected Units.
• Refer to the user’s manual for the CPU Unit or Communications Coupler Unit for precautions for the
safe use of communications with the connected CPU Unit or Communications Coupler Unit.
Standards
• The customer is responsible for attaining conformance of the entire system to standards.
Maintenance
• Test the functionality every six months to detect welded contactor contacts.
To detect electrical and mechanical failures, use a combination of redundant semiconductor output
contacts and redundant mechanical output devices.
Precautions for Safe Use
27
NX-series Safety Control Unit User's Manual (Z930)
Summary of Contents for NX-SIH400
Page 4: ...Introduction 2 NX series Safety Control Unit User s Manual Z930 ...
Page 46: ...Revision History 44 NX series Safety Control Unit User s Manual Z930 ...
Page 108: ...2 Specifications 2 42 NX series Safety Control Unit User s Manual Z930 ...
Page 132: ...3 Installation and Wiring 3 24 NX series Safety Control Unit User s Manual Z930 ...
Page 148: ...4 Safety Control Unit Operation 4 16 NX series Safety Control Unit User s Manual Z930 ...
Page 216: ...5 System Configuration and Setup 5 44 NX series Safety Control Unit User s Manual Z930 ...
Page 306: ...6 Programming 6 90 NX series Safety Control Unit User s Manual Z930 ...
Page 390: ...8 Calculating Safety Reaction Times 8 12 NX series Safety Control Unit User s Manual Z930 ...
Page 412: ...11 Safety Data Logging 11 10 NX series Safety Control Unit User s Manual Z930 ...
Page 504: ...12 Troubleshooting 12 92 NX series Safety Control Unit User s Manual Z930 ...
Page 554: ...l I O Map Settings Appendices A 42 NX series Safety Control Unit User s Manual Z930 ...
Page 623: ...I Index I 1 NX series Safety Control Unit User s Manual Z930 I ...
Page 625: ......