Publication 1752-UM001A-EN-P - October 2006
Manage the Safety Network Number 45
Assignment of the Safety
Network Number (SNN)
An SNN can be generated automatically via RSNetWorx for DeviceNet
software or you can manually assign one. An automatically generated
SNN is sufficient and recommended for most applications.
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.
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