Rockwell Automation 2711 PanelBuilder 1200 Transfer Utility - Manual (Page 60)

Glossary
G-3
RAM—See Battery-Backed RAM
Retentive
An object is retentive when it “retains” its PLC value in the PanelView
1200 terminal after a screen change, an operator’s object action, and
through power cycles. For example, when the operator presses a
maintained push button, the corresponding PLC input is set to 1. This
setting does not change until the button is pressed a second time.
User PROM
The read-only memory chip that can be used to contain a back-up copy of
an application file. The chip can be either an EPROM or an EEPROM.
There are two types of user PROM chips that can be used in the PanelView
1200 terminal: EPROMs and EEPROMs. EPROMs are Electrically
Programmable Read Only Memory chips. EEPROMs are Electrically
Erasable Programmable Read Only Memory chips.
The user PROMs store application files in memory that is protected from
power failure and failure of the internal battery. A PROM burner is
required to copy application files into a user EPROM.
If your system includes a user EEPROM, application files downloaded
through the Upload/Download cable, via Pass-Through, or with a
PCMCIA card, will be stored in both battery-backed RAM and in the
EEPROM. No PROM burner is required.
Upload
The process of transferring an application file from the PanelView 1200
terminal to the development computer, usually for editing.