Rockwell Automation Publication 1756-UM022D-EN-P - May 2017 79
Add, Configure, Monitor, and Replace CIP Safety I/O Devices Chapter 5
5. Click OK.
The controller uses the translated address but CIP Safety protocol requires the
actual address of the device.
Set the Safety Network
Number (SNN)
The assignment of a time-based SNN is automatic when adding new safety
I/O devices. Subsequent safety device additions to the same network are
assigned the same SNN defined within the lowest address on that CIP Safety
network.
For most applications, the automatic, time-based SNN is sufficient. However,
there are cases when the manipulation of an SNN is required.
See
Assign the Safety Network Number (SNN) on page 59.
Use Unicast Connections on
EtherNet/IP Networks
Unicast connections are point-to-point connections between a source and a
destination node. You do not have to enter a minimum or maximum RPI range
or default value for this type of connection.
To configure unicast connections, choose the Connection tab and check Use
Unicast Connection over EtherNet/IP.
Set the Connection Reaction
Time Limit
The Connection Reaction Time Limit is the maximum age of safety packets
on the associated connection. If the age of the data used by the consuming
device exceeds the Connection Reaction Time Limit, a connection fault
occurs. The Connection Reaction Time Limit is determined by the following
equations:
Input Connection Reaction Time Limit =
Input RPI x [Timeout Multiplier + Network Delay Multiplier]
Output Connection Reaction Time Limit =
Safety Task Period x [Timeout Multiplier + Network Delay Multiplier - 1]
The Connection Reaction Time Limit is shown on the Safety tab of the
Module Properties dialog box.
Figure 18 - Connection Reaction Time Limit
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