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1-3
Safety I/O Terminal Overview
1-3-1
About the DST1-series Safety I/O Terminals
The Safety I/O Terminals support the DeviceNet Safety protocol and provide various functions for the Safety
System. The Safety I/O Terminals allow the user to construct a safety control/network system that meets the
requirements for Safety Integrity Level (SIL) 3 according to IEC 61508 (Functional Safety of Electrical/Elec-
tronic/ Programmable Electronic Safety-related Systems) and the requirements for Safety Category 4 ac-
cording to EN 954-1.
The DST1-series safety I/O data is transmitted through safety I/O communications conforming to the De-
viceNet Safety Protocol, and the data processing is performed in the Safety Network Controller (NE1A-
SCPU01).
Also, the status of the safety I/O data can be monitored in a standard PLC in an existing DeviceNet network
using standard I/O communications or explicit message communications.
DST1-series
Safety I/O Terminal
Emergency stop switch
1-3-2
Safety I/O Terminal Features
Safety Inputs
•
Semiconductor output devices such light curtains can be connected as well as contact output devices
such as emergency stop switches.
•
Faults in external wiring can be detected.
•
Input delays (ON delays and OFF delays) can be set.
•
Pairs of related local inputs can be set to Dual Channel Mode in order to be compliant with the Category
4 standards.
When Dual Channel Mode is set, the input data patterns and the time discrepancy between input sig-
nals can be evaluated.
Test Outputs
•
4 independent test outputs are available to use.
•
A disconnected external indicator lamp can be detected. (Can be set for the T3 Terminal only.)
•
Test outputs can be used as power supply terminals to devices such as sensors.
•
Test outputs can be used as the standard output terminals for monitor outputs.
Safety Outputs
•
Semiconductor Outputs
•
Pairs of related local outputs can be set to Dual Channel Mode in order to be compliant with the
Category 4 standards.
When Dual Channel Mode is set, the output data patterns can be evaluated.
•
The rated output current is 0.5 A max. per output.
1-3 Safety I/O Terminal Overview
Network Configurator
DeviceNet
Two-hand switch
Enable switch
Safety gate switch
Safety limit switch
Safety Network Controller
DST1-series
Safety I/O Terminal
Safety relay
Safety Relay Unit
Safety Light Curtain
Standard PLC
DeviceNet Master Unit
Contactor
Valve
19
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