Rockwell Automation 1756-SPESMNRMXT GuardLogix Controllers User Manual - Manuel (Page 71)

Rockwell Automation Publication 1756-UM020I-EN-P - August 2012 71
Add, Configure, Monitor, and Replace CIP Safety I/O Chapter 5
b. Type a name for the new module.
c. Enter the node address or IP address of the module on its connecting
network.
Only unused node numbers are included in the pull-down menu.
d. Modify the safety network number (SNN), if required, by clicking the
button.
See page 71 for details.
e. Set module configuration parameters by using the Input Configuration,
Test Output, and Output Configuration tabs.
Refer to RSLogix 5000 online help for more information on CIP
Safety I/O module configuration.
f. Set the Connection Reaction Time Limit by using the Safety tab.
See page 71 for details.
Setting the Safety Network
Number (SNN) The assignment of a time-based SNN is automatic when adding new Safety I/O
modules. Subsequent safety-module 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 in which manipulation of an SNN is required.
See Assigning the Safety Network Number (SNN) on page 55 .
Using Unicast Connections on
EtherNet/IP Networks In RSLogix 5000 software, version 20 or later, you can configure EtherNet/IP
I/O modules to use unicast connections. 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.
Setting 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]