Generating an Add-On Instruction Signature
The Signature tab of the Add-On Instruction Definition Editor lets you manage the instruction signature, create signature history entries, and view the safety instruction signature, if it exists. Instruction signatures are applied to the definition of the Add-On Instruction. All instances of that Add-On Instruction are sealed when the signature is applied.
Generating, Removing, or Copying an Instruction Signature
On the Signature tab of the Add-On Instruction Definition Editor, click Generate to create an instruction signature or Remove to delete the instruction signature.
You must be offline to generate or remove an instruction signature. Both actions change the Last Edited Date.
You can click Copy to copy the instruction signature and the safety instruction signature, if it exists, to the clipboard to facilitate record-keeping.
Creating a Signature History Entry
The signature history provides a record of signatures for future reference. A signature history entry consists of the name of the user, the instruction signature, the timestamp value, and a user-defined description. You can only create a signature history if an instruction signature exists and you are offline. Creating a signature history changes the Last Edited Date, which becomes the timestamp shown in the history entry. Up to six history entries may be stored.
Follow these steps to create a signature history entry.
1. On the Signature tab of the Add-On Instruction Definition Editor, click Add to History.
2. Type a description, up to 512 characters long, for the entry.
3. Click OK.
To delete the signature history, click Clear Signature History while the instruction does not have an instruction signature. You must be offline to delete the Signature History.
Generating a Safety Instruction Signature
When a sealed safety Add-On Instruction is downloaded for the first time, a SIL 3 safety instruction signature is automatically generated. Once created, the safety instruction signature is compared at every download.
If the Logix Designer application detects an invalid safety instruction signature value, it generates a new safety instruction signature value in the offline project and displays a warning indicating that the safety instruction signature was changed. The safety instruction signature is deleted if the instruction signature is removed.
Viewing and Printing the Instruction Signature
When the instruction signature has been generated, the Logix Designer application displays the instruction with the blue seal icon in the Controller Organizer, on the Add-On Instruction title bar, and in the Logic Editor.
When an instruction is sealed, the instruction signature is displayed on the faceplate of the instruction in the Ladder Diagram Editor and the Function Block Diagram Editor.
Ladder Diagram
Function Block Diagram
You can turn off the display of the instruction signature in the Workstation Options dialog box of the Logix Designer application.
You can also view the instruction signature and the safety instruction signature on the Quick View pane of the Controller Organizer and on the Signature tab of the Instruction Definition Editor dialog box.
The Add-On Instruction name, revision, instruction signature, safety instruction signature, and timestamp are printed on the Add-On Instruction Signature Listing report. You can also choose to include the instruction signature, safety instruction signature, and signature history on the Add-On Instruction report by clicking Print Options on the Generate Report dialog box.
Generating, Removing, or Copying an Instruction Signature
On the Signature tab of the Add-On Instruction Definition Editor, click Generate to create an instruction signature or Remove to delete the instruction signature.
You must be offline to generate or remove an instruction signature. Both actions change the Last Edited Date.
You can click Copy to copy the instruction signature and the safety instruction signature, if it exists, to the clipboard to facilitate record-keeping.
Creating a Signature History Entry
The signature history provides a record of signatures for future reference. A signature history entry consists of the name of the user, the instruction signature, the timestamp value, and a user-defined description. You can only create a signature history if an instruction signature exists and you are offline. Creating a signature history changes the Last Edited Date, which becomes the timestamp shown in the history entry. Up to six history entries may be stored.
Follow these steps to create a signature history entry.
1. On the Signature tab of the Add-On Instruction Definition Editor, click Add to History.
2. Type a description, up to 512 characters long, for the entry.
3. Click OK.
To delete the signature history, click Clear Signature History while the instruction does not have an instruction signature. You must be offline to delete the Signature History.
Generating a Safety Instruction Signature
When a sealed safety Add-On Instruction is downloaded for the first time, a SIL 3 safety instruction signature is automatically generated. Once created, the safety instruction signature is compared at every download.
If the Logix Designer application detects an invalid safety instruction signature value, it generates a new safety instruction signature value in the offline project and displays a warning indicating that the safety instruction signature was changed. The safety instruction signature is deleted if the instruction signature is removed.
Viewing and Printing the Instruction Signature
When the instruction signature has been generated, the Logix Designer application displays the instruction with the blue seal icon in the Controller Organizer, on the Add-On Instruction title bar, and in the Logic Editor.
When an instruction is sealed, the instruction signature is displayed on the faceplate of the instruction in the Ladder Diagram Editor and the Function Block Diagram Editor.
Ladder Diagram
Function Block Diagram
You can turn off the display of the instruction signature in the Workstation Options dialog box of the Logix Designer application.
You can also view the instruction signature and the safety instruction signature on the Quick View pane of the Controller Organizer and on the Signature tab of the Instruction Definition Editor dialog box.
The Add-On Instruction name, revision, instruction signature, safety instruction signature, and timestamp are printed on the Add-On Instruction Signature Listing report. You can also choose to include the instruction signature, safety instruction signature, and signature history on the Add-On Instruction report by clicking Print Options on the Generate Report dialog box.
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