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03/03
4.4.1
Assigned System Marker Area (SM Area)
The CP 243-1 IT occupies 50 bytes in the system marker area of the S7-200 CPU.
The address of these 50 bytes depends on the current position a CP 243-1 IT oc-
cupies in an S7-200 system. These 50 bytes primarily contain general information
and status information of the CP 243-1 IT. The last four bytes contain a pointer with
which the configuration data of the CP 243-1 IT can be accessed. These configura-
tion data are located consecutively in the variable memory of the S7-200 CPU.
These data are divided into the following data blocks.
• Configuration Data Block (CDB)
• Network Parameter Block (NPB)
• Network Data Block (NDB)
• Internet Data Block (IDB)
The following table shows the relationship between the position of a module in the
S7-200 system and the related system marker area.
Position in S7-200
System
CPU
0
1
2
3
4
5
6
Table 6
CP 243-1 IT
J31069-D0429-U001-A0-7618
Occupied
Marker Area
-
200 to 249
250 to 299
Only supported for CPU firmware versions
starting with 1.2
300 to 349
Only supported for CPU firmware versions
starting with 1.2
350 to 399
Only supported for CPU firmware versions
starting with 1.2
400 to 449
Only supported for CPU firmware versions
starting with 1.2
450 to 499
Only supported for CPU firmware versions
starting with 1.2
500 to 549
Only supported for CPU firmware versions
starting with 1.2
System marker area
Configuration
Remarks
-
-
69
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