8 Station variants
8.3 How the "station variants" operating mode works
Gateway XN-312-GW-CAN 06/16 MN050003-DE
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Figure 91:
How the station variants are stored on the PLC and on the gateway
With regard to the user program, the gateway will behave as though the full
configuration were connected. In fact, address mapping will be based on the
full configuration.
After receiving the "Start-Remote-Node" NMT frame, the gateway will switch
to the "OPERATIONAL" status.
If, during initialization phase 1, the "Activation StationVariants Mode" entry =
FALSE, the gateway will send the inputs to the PLC and forward the output
data received from the PLC to the outputs as soon as it switches to the
"OPERATIONAL" status. In this case, the gateway will be in "standard" mode.
If, on the other hand, the "Activation StationVariants Mode" entry = TRUE,
the inputs will not be sent to the PLC and the output data received from the
PLC will not be forwarded (yet) to the outputs even when the "OPERA-
TIONAL" status is reached.
After this, the PLC will need to check the full configuration list stored on the
gateway.
The PLC can handle the list as follows:
•
Approve
•
Edit the existing list / create a new list
•
delete
If the list is approved, the gateway will start, the outputs will be connected to
the hardware, and the EMCY frame will be canceled.
If the PLC edits or deletes the list or creates a new one, this will trigger a
gateway reset. In this case, the gateway will restart with the data from the
new list.
The full configuration check carried out by the PLC consists of the following
steps:
4.
A list with all permitted station variants is stored on the PLC. A check-
sum can be calculated based on any of the corresponding lists.
5.
The PLC reads the checksum for the station variant stored on the gate-
way.
Station variant 1
Full configuration
Station variant n
…
Station variant
Full configuration
Gateway
PLC(S)
(function block)
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