Publication 1752-UM001A-EN-P - October 2006
Manage the Safety Network Number 47
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 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 is displayed.
The Safety Network Number Mismatch dialog 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 and click Reset.
Only the attributes selected on the dialog are reset to their
factory default settings. The Safety Reset only affects the safety
device; the configuration in the RSNetWorx project is not lost.
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