Siemens ET 7Y Series Especificaciones Pagina 120

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Functions of the IM 151-7 CPU
8-8
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Formatting the MMC prior to a memory reset
In certain exceptional cases, you have to format the MMC:
The module type is not a user module.
The MMC has not yet been formatted, is faulty or the data is corrupted.
The content of the MMC has been designated as invalid.
The Load User Program operation has been interrupted by POWER OFF
(see Special Measure).
The Promming operation has been interrupted by POWER OFF
(see Special Measure).
A fault has occurred during evaluation of the module content prior to a memory
reset.
A fault has occurred during formatting, or formatting could not be performed.
If one of the above-described faults has occurred, the CPU also requests another
memory reset after a memory reset has been performed. The content of the card
is retained until the special measure has been completed, unless the Load User
Program or Promming operations are interrupted by POWER OFF.
Description of the special measure:
When the IM 151-7 CPU requests a memory reset (the STOP LED flashes slowly),
format it by operating the selector switch as follows:
1. Set the selector switch to the MRES position and hold it there
(approx. 9 seconds) until the STOP LED remains lit (stops flashing).
2. Within the next 3 seconds you must release the selector switch and move it
back to the MRES position. The STOP LED flashes during the formatting
procedure.
Make sure that you perform the steps in the specified time, otherwise the
MMC will not be formatted and will reassume the Memory Reset status.
The MMC is only formatted if a formatting condition (see above) exists and not e.g.
when a memory reset is requested after a module is changed. In this case,
switching to MRES only results in a standard memory reset whereby the content of
the module remains valid.
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