Procedure for Configuring Master to I-Slave Communication
The same procedure is used to configure safety-related communication master to I-
slave communication as is used to configure master to I-slave communication in a
standard system.
The figure below illustrates the configuration procedure for the address areas in the
previous figure.
Requirement:
You have created a project in STEP 7.
1. Create a station in your project (in SIMATIC Manager, for example, an S7-300
station).
2. Assign a CPU with fail-safe capability to this station (in HW Config, from the
hardware catalog).
3. Configure this CPU as a DP slave (in HW Config, in the Object Properties of
the DP interface of the CPU).
4. Create another station and assign a CPU with fail-safe capability (see steps 1
and 2).
5. Configure this CPU as a DP master (in HW Config, in the Object Properties of
the DP interface of the CPU).
6. In the hardware catalog, under "Configured stations," select the station type of
the intelligent DP slave ("CPU 31x" in this example) and position it on the DP
master system.
7. Link the intelligent DP slave to the DP master in the Connection dialog box,
which is displayed automatically.
Now, you can specify the input and output data areas for the safety-related
master to slave communication:
8. In the "Configuration" tab of the Object Properties of the intelligent DP slave,
select "New."
9. Enter an output data area for the DP master and the associated input data
area for the intelligent DP slave. For this example, make the following entries:
- For "DP partner: Master", enter "Output" for Address type, "16" for
Address, "12" for Length, "Byte" for Unit, and "Total" for Consistent.
- For "Local: Slave", enter "Input" for Address type and "18" for Address.
The dialog box has the following appearance:
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
A5E00169432-02
9
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