User manual

Publication LOGIX-AP010B-EN-P - May 2010 15
Controllers and I/O Modules Chapter 1
Logix Controllers
Care must be taken when estimating the memory requirements for a Logix
project that has been converted from S5.
The S5 is an older generation PLC than the Logix PAC (Programmable
Automation Controller) and comes from a period when memory storage was
bulkier and more expensive than it is today. Thus the S5 controller stored only
the PLC code and not the associated symbols and comments that were
retained on the programming device. When uploading a PLC program from an
S5 controller to a programming device that did not contain the original
program, the resulting program would not contain any symbolic information.
Because memory is now considerably less expensive and physically smaller,
Logix controllers can use tag naming and I/O aliasing for memory locations
and store the information in the CPU. However, this results in the Logix
controller using typically more memory to store a similar program than an S5
PLC.
Logix Controller Memory Capacity
1756-L60M03SE 750 KB
1756-L61 2 MB
1756-L61S (Safety) 2 MB
1 MB (Safety)
1756-L62 4 MB
1756-L62S (Safety) 4 MB
1 MB (Safety)
1756-L63 8 MB
1756-L63S 8 MB
1 MB (Safety)
1756-L64 16 MB
1756-L65 32 MB
1768-L43 2 MB
1768-L45 3 MB
1769-L31 512 KB
1769-L32E 750 KB
1769-L35E 1.5 MB