Formatting MMC when resetting memory
Some specific situations require of you to format the MMC:
• The module type is not an application module.
• The MMC is faulty, corrupted or has not been formatted.
MMC memory is marked invalid.
• The The load application program instruction was interrupted by Power Off
(see special handling).
• Write FEPROM was interrupted as a result of Power Off
(see special handling).
• Module memory evaluation error during memory reset.
• Error when formatting or formatting was not possible.
If one of these errors has occurred, the CPU prompts you to repeat memory reset,
regardless of a previous memory reset. Card memory is retained until a special
handling is carried out, except if Load Application Program/Write to FEPROM
operations have been interrupted as a result of Power Off.
Des cription of Special Handling:
When the CPU requests a memory reset (slow flashing of the STOP LED), format it
using the following switching sequence:
1. Toggle the switch to MRES position and hold it there until the LED stops
flashing (until permanently lit after approx. 9 seconds).
2. Within the next three seconds, release the switch and toggle it once again to
MRES position. The STOP LED now flashes to indicate the formatting process.
Always maintain the specified sequence of operation. Otherwise, the MMC is
not formatted, but rather returns to memory reset status.
The MMC is formatted for specific reasons only (see above); not, for example, in
case of a memory reset request after module replacement. In this case, switching
to MRES merely initiates a normal memory reset, while existing MMC data is
retained.