Omron DeviceNet Safety NE0A Series Operation Manual page 31

System Configuration
Safety Distributed Control System with DeviceNet Safety
Main Safety Control Block
Safety Master
DST1 Safety Slaves
Standard PLC
Standard Master
Monitoring System
Note
IMPORTANT The data attributes handled by standard I/O communications and explicit
Centralized
Monitoring System
with DeviceNet
6
In this example, a safety distributed control system is constructed using a
Safety Master and NE0A-series Controllers. In this system, the Safety Master
controls the entire system while the NE0A-series Safety Slaves control safety
for sub-blocks. The Safety Master executes safety I/O communications with
with NE0A-series Safety Slaves. This enables exchanging safety data, such
as interlock signals, between the NE0A-series Controllers and the Safety
Master.
In addition, using standard I/O communications to assign NE0A-series Con-
troller status information (Unit general status and local I/O errors) and logic
operation results to a standard PLC enables central monitoring of the safety
control system by the standard PLC.
Safety I/O communications
NE0A Safety Slave
Safety Control Sub-block 1
Standard I/O communications
and explicit messages
• The NE0A-series Controller uses two Safety Master connection
resources (IN and OUT). For example, up to 16 NE0A-series Controllers
can communicate with one NE1A-SCPU01-V1 Controller, which supports
a total of 32 connections.
• A maximum total of 64 standard nodes and safety nodes can be con-
nected on the same network.
message communications are non-safety data. The necessary measures for
safety data are not taken for this data during data generation. Therefore, do
not use this data to configure the Safety Control System.
If safety control blocks requiring a small number of I/O points must be distrib-
uted, a safety control system can be constructed using only NE0A-series
Controllers without a Safety Master. In this case, the NE0A-series Controllers
operate only as DeviceNet Standard Slaves, and do not handle safety I/O
communications.
NE0A Safety Slave NE0A Safety Slave
Safety Control Sub-block 2 Safety Control Sub-block 3
Section 1-2