Siemens Simatic S7-1500 Manual - Page 18

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Product overview

2.4 Functions

Procedure using the display

You can reach the "Memory reset" menu command by successively selecting

the following menu command and confirming each step with "OK".

● Settings → Reset → Memory reset

Result: The CPU performs a memory reset.

Procedure using STEP 7

Proceed as follows to reset the CPU memory in STEP 7:

1. Open the "Online Tools" task card of the CPU.

2. Click the "MRES" button in the "CPU control panel" pane.

3. Click "OK" to confirm the security prompt.

Result: The CPU is set to STOP mode and the CPU memory reset is performed.

Memory object response to memory reset

The following table gives an overview of which memory objects are retained

and which are initialized upon memory reset.

Table 2- 2

Memory object

Actual values of the data blocks, instance data blocks

Bit memories, timers and counters

Certain retentive tags from technology objects

(e.g. adjustment values of absolute encoders)

Diagnostic buffer entries (retentive area)

Diagnostic buffer entries (non-retentive area)

Operating hours counter

Time

Reference

For more information about "Memory reset", refer to the Memory reset chapter in the

S7-1500 Automation System

(http://support.automation.siemens.com/WW/view/en/59191792) System Manual.

Retentive characteristics of the memory objects

Contents

Initialized

Retained

Initialized

Retained

CPU 1511-1 PN (6ES7511-1AK00-0AB0)

Manual, 01/2013, A5E31264526-AA