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1-2
Safety Network Controller Overview
1-2-1
About the NE1A Safety Network Controller
The NE1A Safety Network Controller (NE1A-SCPU01) provides various functions, such as safety logic op-
erations, safety I/O control, and a DeviceNet Safety protocol. The NE1A-SCPU01 allows the user to con-
struct a safety control/network system that meets the requirements for Safety Integrity Level (SIL) 3
according to IEC 61508 (Functional Safety of Electrical/Electronic/ Programmable 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-SCPU01 and the
monitoring system implemented with the standard PLC are realized on the same network.
•
As a Safety Logic Controller, the NE1A-SCPU01 executes safety logic operations and controls local I/O.
•
As a Safety Master, the NE1A-SCPU01 controls the remote I/O of Safety Slaves.
•
As a Standard Slave, the NE1A-SCPU01 communicates with the Standard Master.
Safety Logic Operations
and Safety I/O Control
PLC
DeviceNet Standard Master
1-2-2
Safety Network Controller Features
Safety Logic Operations
In addition to basic logic functions, such as AND and OR, the NE1A-SCPU01 also supports application func-
tion blocks, such as Emergency Stop Pushbutton Monitoring and Safety Gate Monitoring, that enable various
safety applications.
Local Safety I/O
•
A total of 24 local safety I/O points are supported: 16 input terminals and 8 output terminals.
•
Faults in external wiring can be detected.
•
Dual Channel Mode can be set for pairs of related local inputs.
When Dual Channel Mode is set, the NE1A-SCPU01 can evaluate the input data patterns and the time
discrepancy between input signals.
•
Dual Channel Mode can be set for pairs of related local outputs. When Dual Channel Mode is set, the
NE1A-SCPU01 can evaluate the output data patterns.
DeviceNet Safety Communications
•
As a Safety Master, the NE1A-SCPU01 can perform safety I/O communications with up to 16 connec-
tions using up to 16 bytes per connection.
1-2 Safety Network Controller Overview
DeviceNet
Standard Slave
Non-safety-related Control
The PLC system monitors the SNC
(i.e., the safety control system) using
DeviceNet I/O communications and
explicit messages.
Network Configurator
SNC
DRT1-series
DeviceNet Safety Slave
Safety-related Control
The DeviceNet Safety
System controls remote I/O
17
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