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1-4 Description of Safety Functions
Dual Channels, Complementary
The status is treated as normal when one channel is ON and the other channel is OFF.
When both channels are ON or both channels are OFF, it is treated as an error, and the
safety input data and the individual safety input status will turn OFF for both inputs.
IN0
IN1
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Discrepancy time
Remote
I/O data
* Normal
IN0
IN1
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Discrepancy time
Remote
I/O data
* Error
Error
Safety input 0
Safety input 1
Status of safety
inputs 0 and 1
Safety input 0
Safety input 1
Status of safety
inputs 0 and 1
Error Recovery
All conditions below are necessary to recover from an error that has occurred in a
safety input.
• The cause of the error must be removed.
• The error latch time must have passed.
• The input signal must return to an inactive state and there must be no error
condition detected. (e.g., by pressing the emergency stop button or opening a
door)
1-16
Summary of Contents for DST1 Series
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Page 5: ...DST1 series Safety I O Terminals Operation Manual Produced April 2005 ...
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Page 24: ...Section 1 Overview ...
Page 44: ...Section 2 General Procedure ...
Page 50: ...Section 3 Configuration ...
Page 63: ...Section 4 Specifications ...
Page 67: ...Section 5 DST1 series ...
Page 79: ...Section 6 Troubleshooting and Maintenance ...
Page 87: ...Section 7 Wiring Examples ...
Page 97: ...Appendices ...
Page 114: ...Cat No Z904 E1 01 OPERATION MANUAL DST1 series Safety I O Terminals ...