User guide

Chapter 3
Understanding File Organization
3–4
Uploading Programs
When you need to modify a program, it may be necessary to upload the
program from an SLC 500 processor to the HHT. If the original HHT
program is not current or the HHT has been attached to a different processor,
uploading is necessary. Use the upload function to do this. When you are
uploading, you can leave the processor in the Run mode.
HHT
RAM RAM
1000
1000
PROCESSOR
Upload
Using EEPROM and UVPROM Memory Modules for Program Backup
An EEPROM or UVPROM memory module can be inserted in SLC 500
controllers. You can use the HHT to transfer a copy of the program in
processor RAM to an EEPROM memory module. UVPROM memory
modules cannot be programmed by a processor
. (You need an external
PROM burner.) You can also transfer a program from an EEPROM or
UVPROM memory module to the processor’s RAM memory.
Refer to page
14–1 for more information on using EEPROMs and UVPROMs.
RAM
1000
MEMORY
MODULE
1000
PROCESSOR
Processor
to Memory
Processor
Memory to