Siemens SIMATIC S7-400H - CPU 41 X as DP Master; Cpus 41 X (MPI;DP Interface as Profibus DP); DP Address Areas of the Cpus 41 X

Installation of a CPU 41x-H
4-30
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
4.9.1 DP Address Areas of the CPUs 41x
Address Areas of the CPUs 41x
Table 4-5 CPUs 41x (MPI/DP Interface as Profibus DP)
Address Area
414-4H 417-4H
MPI interface as PROFIBUS DP, inputs and outputs (bytes) in each case 2048 2048
DP interface as PROFIBUS DP, inputs and outputs (bytes) in each case 6144 8192
In the process image, inputs and outputs in each case
Can be set up to x bytes
8192 16384
DP diagnostics addresses occupy at least one byte for the DP master and each
DP slave in the address area. The DP standard diagnosis for each node can be
called at these addresses, for example (LADDR parameter of SFC 13). You specify
the DP diagnostics addresses at configuration. If you do not specify any DP
diagnostics addresses, STEP 7 assigns the addresses from the highest byte
address downwards as DP diagnostics addresses.
In DPV1 mode of the master, the slaves generally have two diagnostics addresses.
4.9.2 CPU 41x as DP Master
Introduction
This chapter details the properties and technical specifications you need when you
wish to operate the CPU as a Profibus DP master.
Prerequisite
Before commissioning, you must configure the CPU as a DP master. That means
that you must do the following in STEP 7
• Configure the CPU as DP master
• Assign a PROFIBUS address
• Select an operating mode (S7-compatible or DPV1)
• Assign a diagnostics address
• Connect DP slaves to the DP master system