Rockwell Automation 1756-L7x GuardLogix 5570 Controllers - Manual (Page 61)

Rockwell Automation Publication 1756-UM022A-EN-P - November 2012 61
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 61 for details.
e. Set module configuration parameters by using the Input Configuration,
Test Output, and Output Configuration tabs.
Refer to 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 61 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 45 .
Using 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.
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]