Configuring Hardware and Communication Connections STEP 7.pdf

5.7 Configuring Direct Data Exchange
Principle
Configuring IRT Communication
Data ranges can be cyclically exchanged between two IO controllers that are in a
sync domain and take part in IRT communication by means of direct data
exchange.
Like with PROFIBUS DP, data ranges (I/O areas) are configured by CPUs. A CPU
uses these areas to send or receive data.
The CPU with a data range that is configured as the "Sender" sends data via
outputs.
The CPU with a data range that is configured as the "Receiver" receives data via
inputs.
Recommendation
We recommend that the sender ranges for all IO controllers be configured first, and
then the receiver ranges.
Configuring the Sender
1. Open the property sheet for the IO controller (double-click the corresponding
row in the configuration table in HW Config).
2. Select the "Sender" tab.
3. Click the "New" button.
4. In the property sheet for the sender, enter the start address of the sender and
the length of the address area that will be used when sending.
Add some comments about this data range so that the data sent using this
range can be identified later on.
5. Confirm your settings with "OK".
6. Repeat steps 3 to 5 for additional sender ranges.
7. If you like, change the default address for the sender ranges .
For communication in which an IO controller is used as sender for direct data
exchange, only one diagnostic address can be assigned.
Configuring Hardware and Communication Connections with STEP 7
A5E00706939-01 5-7