Address Check when using UMC in Motor Control Centres
If the UMC is used in MCCs the address check can be enabled. This ensures that the bus address in the communication interface
and the UMC must match before the bus communication can start. This ensures that in the event of an unintentional permutation
of a drawer the bus address stays in place and does not move with the drawer. A precondition for this function is the separation of
communication interface and UMC. In MCCs the communication interface is usually mounted in the cable chamber whereas the
UMC is mounted in the withdrawable unit. This means that even if the withdrawable is removed the communication interface stays
active, keeps the bus address and can send an error message (missing device) to the control system.
The following cases can occur:
1. Neither the UMC100.3 nor the communication interface contains a valid address (i.e. 255): The UMC does not start to
communicate.
2. Only the UMC100.3 contains a valid address (i.e. 255): The communication interface receives the address and saves it. Then the
bus communication starts automatically.
3. Only the communication interface contains a valid address (e.g. a new spare UMC is connected which has 255 as address).
The UMC gets the address from the communication interface and saves it. Then the communication starts.
4. The UMC100.3 and the communication interface contain the same address: Operation and communication starts.
The UMC100.3 and the communication interface contain different addresses (e.g. unintentional permutation when installing a
drawer): The behaviour of the UMC100.3 depends on the setting of the parameter Address check.
Case 5a: Address check = Off (= 0) (default)
The communication interface stores the address received from the UMC100.3 and communication starts.
Case 5b: Address check = On (1)
• The communication does not start. In the LCD control panel an address fault is displayed
• To start the bus communication the correct address (i.e. the one from the communication interface must
be selected in the UMC100.3
• Enter the fault menu with the left hot-key (Addr)
• Click "Fix" (right hot-key) to select the communication interface bus address
• After saving the corrected bus address the communication starts immediately
• Both the communication interface and the UMC100.3 store the adjusted address.
Related Parameter:
• Address Check
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