Rockwell Automation 1752-L24BBBE SmartGuard 600 Controllers User Manual - Manual (Page 63)

Rockwell Automation Publication 1752-UM001E-EN-P - June 2014 63
Manage the Safety Network Number Chapter 5
Automatic (time-based)
When a new safety device is added to the network configuration, a default SNN
is automatically assigned via the configuration software, as follows.
• If at least one safety device already exists in the DeviceNet network
configuration, subsequent safety additions to that network configuration
are assigned the same SNN as the lowest-addressed safety device.
• If no other safety devices exist in the DeviceNet network configuration, a
time-based SNN is automatically generated by RSNetWorx for DeviceNet
software.
Manual
The manual option is intended for systems where the number of DeviceNet
subnets and interconnecting networks is small, and where you might like to
manage and assign each SNN in a logical manner pertaining to your specific
application.
To set the SNN in a safety device via RSNetWorx for DeviceNet software, select
the device in the hardware graphic view and choose Set Safety Network Number
from the Device menu.
Set the Safety Network
Number (SNN) in All Safety
Nodes A time-based SNN is automatically generated when the first new safety device is
added to the network. Subsequent additions to the network are assigned the
same SNN as the lowest-addressed safety device. This automatic, time-based
SNN is sufficient and recommended for most applications.
IMPORTANT If you assign an SNN manually, take care to be sure that system expansion does
not result in duplication of SNN and node address combinations.
IMPORTANT When you set the SNN, the device is returned to its factory default
configuration.