PROFIBUS DP
7.1 CPU 41x–H as PROFIBUS DP master
S7-400H
88 System Manual, 03/2012, A5E00267695-11
7.1.1 DP address ranges of CPUs 41x-H
Address ranges of CPUs 41x-H
Table 7- 1 CPUs 41x, MPI/DP interface as PROFIBUS DP interface
Address range 412-5H 414-5H 416-5H 417–5H
MPI as PROFIBUS DP, inputs and outputs (bytes) in each case 2048 2048 2048 2048
DP interface as PROFIBUS DP, inputs and outputs (bytes) in each
case
4096 6144 8192 8192
Of those addresses you can configure up to x bytes for each I/O in the
process image
0 to 8192 0 to 8192 0 to 16384 0 to 16384
DP diagnostics addresses occupy at least 1 byte for the DP master and each DP slave in the
input address area. At these addresses, the DP standard diagnostics can be called for the
relevant node by means of the LADDR parameter of SFC 13, for example. Define the DP
diagnostics addresses when you configure the project data. If you do not specify any DP
diagnostics addresses, STEP 7 automatically assigns the addresses as DP diagnostics
addresses in descending order, starting at the highest byte address.
In DPV1 mode of the master, the slaves are usually assigned 2 diagnostics addresses.
7.1.2 CPU 41xH as PROFIBUS DP master
Requirement
You have to configure the relevant CPU interface for use as PROFIBUS DP master. This
means you must make the following settings in STEP 7:
● Assign a network
● Configure the CPU as PROFIBUS DP master
● Assign a PROFIBUS address
● Change the operating mode, if necessary; the default setting is DPV1.
● Link DP slaves to the DP master system
Note
Is one of the PROFIBUS DP slaves a CPU 31x or CPU 41x?
If yes, you will find it in the PROFIBUS DP catalog as "preconfigured station". Assign this
DP slave CPU a slave diagnostics address in the PROFIBUS DP master. Link the
PROFIBUS DP master to the DP slave CPU, and specify the address areas for data
exchange with the DP slave CPU.
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