Coordinating Data Interchange In The Control Program - Siemens SIMATIC S5-115U User Manual

S5-115U Manual
You can transfer data over the SINEC L1 local area network in the following two ways:
• from one node to another
- master slave
- slave master
- slave slave
• from one node to all other nodes simultaneously (broadcast).
The following data can be transmitted:
• signal states of inputs, outputs, and flags;
• contents of data words.
Besides data, you can also transmit programmer functions on the SINEC L1 local area network. A
programmer that is connected to the master's CP 530 can address individual slaves (see the
SINEC L1 manual 6ES5 998-7LA21).

12.2.2 Coordinating Data Interchange in the Control Program

A slave needs the following to interchange data:
• a slave number (1 to 30)
• a Send mailbox (SF)
• a Receive mailbox (EF)
• coordination bytes
Transmitter (Source)
Receive
mailbox
EWA 4NEB 811 6130-02b
I
Q
F
Send
mailbox
Figure 12-3. Data Transport
Communications Capabilities
Receiver (Destination)
I
Q
F
Receive Send
mailbox mailbox
12-9