Rockwell Automation Publication 1756-RM012B-EN-P - April 2018 57
Safety Application Development Chapter 6
Upload the Safety
Application Program
If the GuardLogix controller contains a safety signature, the safety signature is
uploaded in an online save of the project. As a result, all offline safety tag values
are updated to the snapshot values saved at the moment the signature was
generated. In this case, the option to upload tag values only affects standard tag
values.
Store and Load a Project
from a Memory Card
GuardLogix and Compact GuardLogix controllers support firmware updates,
and user program storage and retrieval with a memory card. In a GuardLogix
system, only the primary controller uses a memory card.
When you store a safety project on a memory card, we recommend that you
select Remote Program as the Load mode, that is, the mode the controller
enters following the load. Before actual machine operation, operator
intervention is required to start the machine.
You can initiate a load from a memory card only under these conditions:
• If the controller type specified by the project that is stored on the
memory card matches your controller type.
• If the major and minor revisions of the project on the memory card
match the major and minor revisions of your controller.
• If your controller is not in Run mode.
Loading a project to a safety-locked controller is allowed only when the safety
signature of the project that is stored on the memory card matches the project
on the controller. If the signatures do not match or the controller is safety-
locked without a safety signature, you must first unlock the controller before
attempting to update the controller via a memory card.
Force Data
All data that is contained in an I/O, produced, or consumed safety tag,
including CONNECTION_STATUS, can be forced while the project is
safety-unlocked and no safety signature exists. However, forces must be
removed, not just disabled, on all safety tags before the safety project can be
safety-locked or a safety signature can be generated. You cannot force safety
tags while the project is safety-locked or when a safety signature exists.
IMPORTANT A revision mismatch helps prevent only user-initiated loads.
Controller-initiated loads overwrite the firmware on the controller
with the contents of the memory card.
IMPORTANT If you unlock the controller and initiate a load from the memory card, the
safety-lock status, passwords, and safety signature are then set to the
values contained on the memory card once the load is complete.
TIP You can install and remove forces on standard tags regardless of the safety-locked
or unlocked state.
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