Installation and commissioning
3.3 C-PLUG (configuration plug)
CP 343-1 ERPC
20 Manual, 03/2010, C79000-G8976-C239-02
The ERPC firmware is stored in the internal file system of the CP and not on the C-PLUG or
on the CPU. See also section Memory organization (Page 35).
Principle
The power is supplied by the CP. If there is a power down, the C-PLUG retains all data
permanently.
Flash components are used in the C-PLUG in which the number of write operations is
limited. This must be taken into account when using blocks in the user program that write
data to the C-PLUG (for example FB55 with changing IP parameters). Refer to the
information in section Characteristics of the C-P
LUG (Page 34).
Inserting in the C-PLUG slot
The slot for the C-PLUG is on the rear panel of the device.
The C-PLUG is inserted in the receptacle.
NOTICE
The C-PLUG must be inserted or removed only when the power is off!
Fitting the C-PLUG (left) and removing it from the CP with a screwdriver (right)
How the C-PLUG works when the CP starts up (module replacement situation)
If the C-PLUG has not yet been written to (as shipped), when the STEP 7 configuration is
downloaded to the CP, all the configuration data of the CP is saved automatically on it. This
does not include the ERPC firmware, the ILS Workbench configuration and the ILS license
file.
If the S7 station had previously been operational and the CP configuration data is stored on
the CPU (option "Save configuration data on the CPU"), an unwritten C-PLUG adopts all the
STEP 7 configuration data from the CPU when the CP starts up. This does not include the
ERPC firmware and the ILS Workbench configuration.
If the C-PLUG is inserted, the basic device automatically uses the configuration data of the
C-PLUG. This assumes that the data was written by a compatible device type.
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