Siemens Simatic S7-300 Specifications download pdf (Page 32)

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x

3-16 A5E00105475-03

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The table below shows the properties and functions of the real-time clock.

Table 3-11 Properties and functions of the real-time clock

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Type Software clock Hardware clock

Manufacturer setting DT#1994-01-01-00:00:00 DT#1994-01-01-00:00:00

Buffering No with integrated capacitor

Backup period – Typically 6 weeks (at an

ambient temperature of 40

°C)

Behavior of the real-time

clock after POWER ON

The clock keeps running,

continuing with the time it

had when the power was

switched off.

The clock continues running

after the POWER OFF.

Behavior of the clock on

expiration of the backup

period

– The clock keeps running,

continuing at the time-of-day

it had when power was

switched off.

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• Synchronization and correction factor:

When you configure your CPU in 67(3, you can customize functions such as

synchronization via MPI interface and the correction factor. Refer to the 67(3

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• Setting, reading and programming the real-time clock:

You can read and set the real-time clock with your PG (refer to the Manual

3URJUDPPLQJZLWK67(3). or you program the respective SFCs in your

application program (refer to the 6\VWHPDQG6WDQGDUGIXQFWLRQV) Reference

Manual.

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Siemens Simatic S7-300 Specifications Page 32