Rockwell Automation 1752-L24BBBE SmartGuard 600 Controllers User Manual - Manual (Page 65)

Rockwell Automation Publication 1752-UM001E-EN-P - June 2014 65
Manage the Safety Network Number Chapter 5
Safety Network Number
(SNN) Mismatch RSNetWorx for DeviceNet software compares the offline SNN to the online
SNN during each browse operation, one-shot or continuous, and during upload
and download operations. If the SNNs do not match, RSNetWorx for DeviceNet
software indicates an error with the SNN. The hardware graphic view displays
the ! symbol over the safety device icon.
When online, RSNetWorx for DeviceNet software also checks for an SNN
mismatch whenever a safety device’s Device Properties dialog box is selected,
either from the Device>Properties menu or by double-clicking the device. If an
SNN mismatch condition exists, the Safety Network Number Mismatch dialog
box is displayed.
The Safety Network Number Mismatch dialog box displays the online (device)
SNN and the offline (software) SNN. You can choose to upload the device’s
SNN or download the offline SNN to resolve the mismatch.
If the device’s SNN has not been initialized, the Device Safety Network Number
field displays the default SNN: FFFF_FFFF_FFFF. When the device’s SNN is
FFFF_FFFF_FFFF, the Upload button is dimmed and unavailable.
Safety Network Number
(SNN) and Node Address
Changes If you want to change the address of a safety device, the SNN must be
uninitialized, or you must first reset the SNN.
Follow these steps to reset the SNN.
1. Select the device in the hardware graphic view.
2. From the Device menu, choose Reset Safety Device.
3. Check the Safety Network Number checkbox on the Reset Safety Device
dialog box and click Reset.
Only the attributes selected on the dialog box are reset to their factory
default settings. The Safety Reset only affects the safety device; the
configuration in the RSNetWorx project is not lost.