84 Rockwell Automation Publication 1756-RM100F-EN-P - October 2018
Chapter 4 Replacement Considerations with Safety Applications
Applications with 
1734-AENTR Series A Modules
If your system includes 1734-AENTR Series A modules and you update to a 
GuardLogix 5580 controller, reconnection events can result in a failure to 
connect. The modules display error code 16#203 (connection time out) or 
16#117 (invalid connection POINT). Rockwell Automation recommends 
that you upgrade to 1734-AENTR Series B or later modules.
Safety Signature
The safety signature consists of an ID number, date, and time that uniquely 
identifies the safety portion of a project. This signature includes safety logic, 
data, and configuration. 
• Compact GuardLogix 5370 and GuardLogix 5570 controllers in SIL1 
or SIL2 configuration did not require safety signature. 
• Compact GuardLogix 5370 and GuardLogix 5570 controllers in a SIL3 
configuration, required a safety signature.
• For Compact GuardLogix 5380 and GuardLogix 5580 controllers in a 
SIL2 configuration (safety controller only), a safety signature is required 
for up to SIL2. 
• For GuardLogix 5580 controllers in a SIL3 configuration (primary 
safety controller and safety partner), a safety signature is required.
For Compact GuardLogix 5380 and GuardLogix 5580 controllers, the safety 
signature ID is now 256-bit.
Compact GuardLogix 5370 and GuardLogix 5570 
Controllers Safety Signature ID
Compact GuardLogix 5380 and GuardLogix 5580 Controllers 
Safety Signature ID