Power Up Functions; Checksum And Read/Write Memory Tests - Allen-Bradley PanelView 1200 Series User Manual

Power Up Functions

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The operator must press the Clear button to resume normal operation. The
Clear button temporarily overrides the function that was previously
assigned to the associated function key or touch cells. Minor faults do not
affect PLC communications.
When you power up the PanelView 1200 terminal, it performs a number of
tests for major or minor faults to determine if any problems will affect its
operation. If a major fault is detected, the system will enter Fault mode.
Once all the tests are successfully completed, the PanelView 1200 terminal
will go into Configuration or Run mode, depending on the Mode Select
Keyswitch setting.
Important If an application file is in battery-backed RAM and a user
memory PROM containing a different application file has been installed,
the application file in RAM will be overwritten with the application file in
user PROM at power up.

Checksum and Read/Write Memory Tests

At powerup, the Checksum tests verify the firmware memory, the
application file stored in the battery-backed RAM, and the user PROM.
There is also a read-write memory test which verifies the battery-backed
RAM.
if the firmware memory fails, it is a major fault
if the application file fails, it is a major fault
if the user PROM fails, it is a minor fault
if the battery-backed RAM fails, it is a major fault.
Chapter 2
PanelView 1200 Terminal Functions
Clear
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