3
Safety Network Controller Overview
Section 1-2
1-2
Safety Network Controller Overview
1-2-1
About the NE1A-series Safety Network Controllers
The NE1A-series Safety Network Controllers provide various functions, such
as safety logic operations, safety I/O controls, and a DeviceNet Safety proto-
col. The NE1A-series Controllers 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/Electronic/ Program-
mable Electronic Safety-related Systems
) and the requirements for Safety
Category 4 according to EN 954-1.
In the example system shown below, the safety control system implemented
with the NE1A-series Controller and the monitoring system implemented with
the standard PLC are realized on the same network.
• As a Safety Logic Controller, the NE1A-series Controller executes safety
logic operations and controls local I/O.
• As a Safety Master, the NE1A-series Controller controls the remote I/O of
Safety Slaves.
• As a Standard Slave, the NE1A-series Controller communicates with the
Standard Master.
PLC
DeviceNet Standard Master
SNC
DeviceNet
Standard Slave
Network Configurator
DRT1-series
DeviceNet Safety Slave
Safety-related Control
Non-safety-related Control
Safety Logic Operations
and Safety I/O Control
The NE1A PLC system monitors the
SNC (i.e., the safety control system)
using DeviceNet I/O communications
and explicit messages.
The DeviceNet Safety
System controls remote I/O.
Summary of Contents for DeviceNet Safety
Page 1: ...SYSTEM CONFIGURATION MANUAL Cat No Z905 E1 07 DeviceNet Safety...
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Page 5: ...DeviceNet Safety System Configuration Manual Revised July 2009...
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Page 11: ...ix TABLE OF CONTENTS Appendix 277 Glossary 333 Index 335 Revision History 339...
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