| Protocol |
Advantages |
Disadvantages |
| DP |
- Very fast communication.
- Flexible implementation even with third-party systems.
- Data transfer with acknowledgment.
- Access without function call for small amounts or inconsistent
data.
|
- The utility is suitable only for small data volumes (<=244
bytes).
- Can only transfer static data.
- Relatively complicated configuration.
|
|
FDL |
- Very fast communication.
- Data is transferred consistently.
- Both Multicast and Broadcast functions are
possible.
|
- Only suitable for small data volumes (<=236 bytes)
- Transfer is not acknowledged. User acknowledgment requires
evaluation of the message by the program.
- More program resources are required to administer the data and
also the connection partners, because of the SEND/RECEIVE program
interface.
|
| S7 |
- Communication configuration not necessary.
- Data can be transferred dynamically and variably.
- Connection resources can be controlled by the application in
the PLC.
|
- Can only be used for communication between SIMATIC S7
stations.
|
| PG/OP |
- Teleprogramming possible.
- Internetwork implementation of PG communication possible
through routing.
|
- No protocol for module
communication.
|
german
