Omron DEVICENET SAFETY - CONFIGURATION MANUAL 05-2005 System Configuration Manual page 85

Connection Type
Select the connection type to use between the NE1A-SCPU01 and Safety Slave.
Connection Type
Multi-cast
connection
Single-cast
connection
EPI (Expected Packet Interval)
The EPI is the interval at which the Safety Slave communicates the safety data with the NE1A-SCPU01. The
minimum set value is the greater of the destination Safety Slave cycle time and NE1A-SCPU01 cycle time.
The cycle time of the DST1-series Safety I/O Terminals is always 6 ms. Check the cycle time of the NE1A-
SCPU01 in the Mode/Cycle Time Window when all the parameter settings and programming have been per-
formed.
The time set here affects the network bandwidth and the network reaction time. For information on the net-
work bandwidth, refer to 3-2 Verifying the Network Bandwidth (page 59) and for information on the network
reaction time, refer to 3-3 Calculating and Verifying the Maximum Reaction Time (page 63).
Advanced
The Advanced Button enables changing more detailed communications parameters. These parameters af-
fect system operation; do not change them under normal conditions.
5-1 Safety Connection Settings
Description
This connection type can be selected only with a Safety Input Slave. When a multi-
cast connection is selected, a Safety Input Slave can transmit the input data to a max-
imum of 15 NE1A-SCPU01 Controllers via a multi-cast connection.
These NE1A-SCPU01 Controllers are classified as the same multi-cast group when
multiple NE1A-SCPU01 Controllers establish a multi-cast connection with one Safety
Slave and the I/O assembly and EPI values specified in I/O Connection are the same.
This connection type can be selected even for one NE1A-SCPU01.
This connection type can be selected for an input connection or output connection.
The NE1A-SCPU01 and the Safety Slave establish a 1:1 connection and send safety
data.
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