3 Detailed checklist
Checklist
Article ID: 109745536, V2.0, 05/2022
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3.9
Dynamic Configuration Protocol
3.9.1
DCP access
Description
The "Dynamic Configuration Protocol" ("DCP") is used to assign core parameters
to the devices, such as IP settings or PROFINET names. DCP also offers an option
that resets the device to factory settings.
PROFINET controllers or engineering software (such as SINEC PNI, STEP 7,
PRONETA) typically use DCP to find and configure devices.
DCP cannot be IP routed and is therefore limited to the local
layer-2 network.
Menu path
You can find this information in the following paths:
•
With MSPS: "System > Configuration"
•
With X-200 and X-300: "Agent"
Recommendation
Restrict DCP access to read-only (write-protected).
Write and read access allow for IP parameters and/or the PROFINET name to be
modified; and a reset can also be triggered. This can happen even if the login
credentials are not known.
Read-only access means the device no longer responds to "DCP Set Requests".
With this setting, it is not possible to assign parameters using engineering tools, not
even if the device remains visible.
Note
If you run the SCALANCE device as a PROFINET device and enable DCP read
access at the same time, the following settings must match the settings on the
controller:
•
IP address
•
Subnet mask
•
Gateway IP address
•
PROFINET name
A controller cannot assign parameters because the SCALANCE device does not
respond to "DCP Set Requests".
If all parameters are set correctly in the SCALANCE device, DCP assignment is not
necessary. PROFINET communication commences immediately.
Note
You can also disable DCP in MSPS devices. Under this setting, the device does
not send a response and is therefore invisible as far as DCP is concerned. You
cannot run the SCALANCE device as a PROFINET device when DCP is disabled.
