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Commissioning and Diagnostics

7-4

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

7.2 Resetting the memory of the IM 151-7 CPU

When do you reset the memory of the IM 151-7 CPU?

The memory of the IM 151-7 CPU must be reset

 to erase retentive areas (memory markers, times, counters)

 if the IM 151-7 CPU requests a memory reset by flashing the STOP LED at

0.5 Hz

The following are possible reasons for the MRES request:

 The ET 200S is starting up for the first time.

 Inconsistent memory areas

 The memory module (MMC) has been replaced.

How do you reset the memory?

There are two ways of resetting the IM 151-7 CPU:

Table 7-2 Ways to reset the memory

Resetting the memory with the mode

selector

Resetting the memory with the PD

Described in this chapter. Only possible during CPU STOP (see the

PD manuals and the STEP 7 Online Help)

Resetting the memory of the IM 151-7 CPU with the mode selector

To reset the memory of the IM 151-7 CPU using the mode selector, proceed as

follows (see also Figure 7-1):

1. Switch the mode selector to the STOP position.

2. Depress the mode selector in the MRES position. Hold the mode selector at

this position until the STOP LED lights up for the second time (3 seconds) and

then let it return to the STOP position.

3. Within 3 seconds, you must press the mode selector back to the MRES position

and hold it in this position until the STOP LED flashes rapidly (at 2 Hz). When

the IM 151-7 CPU has completed the memory reset, the STOP LED stops

flashing and remains on.

The IM 151-7 CPU has reset the memory.

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Siemens ET 7Y Series Especificaciones Pagina 86