Siemens SIMATIC ET 200S Manual page 54

Addressing
Data consistency
You define data consistency as byte, word, or overall consistency per address
area. Consistency can amount to up to 32 bytes/16 words per address area.
DP diagnostic address in STEP 7
When the ET 200S is configured with STEP 7, two diagnostic addresses are set.
The ET 200S receives information on the status of the DP master or on a bus
interruption by means of these diagnostic addresses (see Section 7.5). In DP slave
mode, the diagnostic addresses are at 2045 and 2046 by default.
2045: Address for slot 2 (IM 151-7 CPU)
2046: Diagnostic address
Detailed information can be found in the Online Help for STEP 7 under Slot Model
for I Slaves.
Access to free areas in the process image
If you access available but unconfigured process image areas, no process image
errors will be generated. You can therefore use inputs and outputs in the process
image to which no I/O modules are allocated as markers.
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ET 200S IM 151-7 CPU Interface Module
A5E00058783-04