Siemens SIMATIC S7-1200 System Manual page 1368

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Table of Contents

Technical specifications

A.2 General technical specifications

Data for selecting an actuator

Activating a digital input

Switching frequency

Internal CPU memory retention

● Lifetime of retentive data and data log data: 10 years

● Power down retentive data, Write cycle endurance: 2 million cycles

● Data log data, up to 2 KB per data log entry, Write cycle endurance: 500 million data log

Effect of data logs on internal CPU memory

Each data log write consumes at a minimum 2 KB of memory. If your program writes small

amounts of data frequently, it is consuming at least 2 KB of memory on each write. A better

implementation would be to accumulate the small data items in a data block (DB), and to

write the data block to the data log at less frequent intervals.

If your program writes many data log entries at a high frequency, consider using a

replaceable SD memory card.

At ohmic load

At inductive load (according to IEC

947-5-1 DC13/AC15)

At lamp load

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK