128 Rockwell Automation Publication 1756-UM022D-EN-P - May 2017
Chapter 7 Go Online with the Controller
Safety Task Signature and Safety-locked and -unlocked Status
The existence of a safety task signature and the safety-locked or -unlocked
status of the controller affect both the upload and download processes.
On Upload
If the controller has a safety task signature, the safety task signature and the
safety task lock status are uploaded with the project. For example, if the project
in the controller was safety-unlocked, the offline project remains safety-
unlocked following the upload, even if it was locked prior to the upload.
Following an upload, the safety task signature in the offline project matches the
controller’s safety task signature.
On Download
The existence of a safety task signature, and the controller’s safety-lock status,
determines whether or not a download can proceed.
Table 39 - Effect of Safety-lock and Safety Task Signature on Download Operation
Safety-lock Status Safety Task Signature Status Download Functionality
Controller safety-unlocked
Safety task signature in the offline project
matches the safety task signature in the
controller.
All standard project components are downloaded. Safety tags are reinitialized to the values
they had when the safety task signature was created. The safety task is not downloaded. Safety
lock status matches the status in the offline project.
Safety task signatures do not match. If the controller had a safety task signature, it is automatically deleted, and the entire project is
downloaded. Safety lock status matches the status in the offline project.
Controller safety-locked
Safety task signatures match. If the offline project and the controller are safety-locked, all standard project components are
downloaded and the safety task is re initialized to the values they had when the safety task
signature was created.
If the offline project is not safety-locked, but the controller is, the download is blocked and you
must first unlock the controller to allow the download to proceed.
Safety task signatures do not match. You must first safety-unlock the controller to allow the download to proceed. If the controller
had a safety task signature, it is automatically deleted, and the entire project is downloaded.
Safety lock status matches the status in the offline project.
IMPORTANT During a download to a controller that is safety-unlocked, if firmware in
the controller is different than in the offline project, do one of the
following:
• Update the controller so that it matches the offline project. Once the
update is completed, the entire project is downloaded.
• Update the project to the controller version.
If you update the project, the safety task signature is deleted, and the
system requires revalidation.
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