Siemens SIMATIC S7 System Manual page 142

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PLC device configuration

6.1 Configuring the operation of the PLC system

By default, the CPU has no defined retentive memory areas, but you can configure the

retentive ranges:

● The S7-200 SMART CPU models CPU SR20, CPU ST20, CPU SR30, CPU ST30, CPU

SR40, CPU ST40, CPU SR60, and CPU ST60 have a maximum of 10 Kbytes of retentive

● The S7-200 SMART CPU models CPU CR20s, CPU CR30s, CPU CR40s, and CPU

CR60s have a maximum of 2 Kbytes of retentive memory.

Data retention after CPU power interruption

The CPU performs the following actions regarding retentive memory at power down and

● At power down:

The CPU saves the memory ranges designated as retentive to permanent memory.

● At power up:

The CPU first clears V, M, C, and T memory, copies any initial values from the data block

to V memory, and then copies the saved retentive values from permanent memory to

S7-200 SMART CPU memory addresses for retentive ranges

System Manual, V2.3, 07/2017, A5E03822230-AF

S7-200 SMART

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Troubleshooting

Simatic s7-200 smart