PROFIBUS DP-V0, DP-V1, and DP-V2 identify different communication capabilities. Select the required capability from the application's data, alarm, and synchronization needs, then confirm that the proposed master and slaves explicitly support it.
DP Version Function Comparison
| Version | Core functions | Application requirement |
|---|---|---|
| DP-V0 | Configuration, parameterization, cyclic input reads, cyclic output writes, and diagnostic-data reads | Deterministic cyclic process I/O with device diagnostics |
| DP-V1 | Cyclic communication plus non-isochronous acyclic reads and writes and alarm acknowledgment | Online access to slave parameters or measured values and reliable alarm transfer |
| DP-V2 | Isochronous operation and direct communication between DP slaves | Application synchronization or slave-to-slave data exchange |
When DP-V1 Is Required
Choose DP-V1 when the master must access parameters or measured values without interrupting cyclic process-data exchange. Acyclic traffic suits information that changes less frequently than cyclic measured values; it runs at lower priority in parallel with the high-speed cyclic traffic.
DP-V1 also adds alarm handling. The master acknowledges alarms so that DP slaves can transfer them reliably while normal cyclic communication continues.
When DP-V2 Is Required
Choose DP-V2 when the application requires an isochronous bus cycle or direct data communication between slaves. In isochronous operation, the master distributes a constant-cycle synchronization signal to all bus stations through a global control message, allowing master and slave applications to synchronize.
For the drive applications described in the evidence, cycle-to-cycle jitter of this signal must be less than 1 microsecond. Treat this as an application requirement to verify; the evidence does not provide the hardware configuration or measurement method.
Select and Verify the PLC Hardware
- List the required functions: cyclic I/O and diagnostics, acyclic parameter access, alarm acknowledgment, isochronous synchronization, or direct slave-to-slave communication.
- Match those functions to DP-V0, DP-V1, or DP-V2 using the comparison table.
- Check the Siemens master's published technical data for an explicit statement of the required DP capability. Confirm the same required services in each slave's documentation.
- Verify the required operation during commissioning: cyclic I/O and diagnostics for DP-V0; acyclic access and alarm acknowledgment for DP-V1; synchronization and direct slave communication for DP-V2.
The available evidence does not establish that every Siemens PLC module supports every DP version, nor does it identify a universal special module. Determine module requirements from the exact CPU or communication-processor technical data rather than from the PLC family name alone.
FAQ
What is the difference between PROFIBUS DP-V0 and DP-V1?
DP-V0 provides configuration, parameterization, cyclic I/O, and diagnostics. DP-V1 adds acyclic parameter or measured-value access and alarm acknowledgment alongside cyclic communication.
When does an application need PROFIBUS DP-V2?
Use DP-V2 when the application requires isochronous synchronization or direct communication between DP slaves. The cited drive requirement limits cycle-to-cycle synchronization jitter to less than 1 microsecond.
Does every Siemens PROFIBUS module support DP-V1 or DP-V2?
The evidence does not confirm universal support. Check the exact master's and slaves' technical specifications for the required DP functions before selecting hardware.