Rockwell Automation 1747-PCIS2 PCI Bus Card - Manual (Page 4)

4 PCI Bus Card for 1746 Local I/O
Publication 1747-5.31–April 1998
User SRAM
256K (1747-PCIS) or 1M (1747-PCIS2) battery backed-up SRAM exists
on the scanner to be used by the host CPU. The host application defines
the SRAM’s function.
For additional information on access and use of the user SRAM when
using the API software, see 1747 PCI Bus Interface for 1746 Local I/O
API Software user manual, publication 1747-6.5.3. If you are using
another software application, refer to the documentation for that software.
Setting the Jumper for Battery Back-Up
The PCI Bus card uses an on board jumper that can be set in either of two
positions:
•
Enabled - This setting provides battery back-up for both Dual Port
RAM and User SRAM. This mode will substantially decrease the
battery life.
or
•
Disabled - This setting provides battery back-up for SRAM only
The default position on the jumper is to the disabled position. The jumper
for battery back-up looks like this:.
Jumper for
battery back-up
Enabled position
Disabled position
41177-M