Automatic Replacement of a Faulty AS-i Slave

Principle

When a faulty slave is replaced, the replacement slave's address can be automatically programmed if the following two conditions are met:

The TBX SAP 10 must operate in protected mode,

Only a single slave may be unserviceable.

In this case, the TBX SAP 10 signals the fault to the PLC by indicating a configuration error on the AS-i bus.

The replacement of a faulty slave by a slave of the same type occurs without the AS-i bus having to stop, and without requiring any specific manipulation. Two options are available:

The replacement slave is programmed with the same address using the pocket programmer, and has the same profile as the faulty slave. It will then be automatically inserted into the list of detected slaves (LDS) and list of active slaves (LAS).
The replacement slave is blank (address 0, new slave) and has the same profile as the faulty slave. It will automatically assume the address of the replaced slave, and will then be inserted into the list of detected slaves (LDS) and the list of active slaves (LAS).

Procedure

The following table shows the procedure for identifying the address of the faulty slave :

Step	Action
1	Switch the TBX SAP 10 to diagnostic mode and check the list of active slaves (LAS).
2	On the TBX SAP 10 display block, check the number of the LED that is flashing.

Procedure

The following table shows the procedure for replacing a faulty slave :

Step	Action
1	Disconnect the faulty slave.
2	Connect an identical slave instead (with the same identification and I/O code) at address 0 or at the same address as the slave to be replaced. Result: The TBX SAP 10 automatically assigns the address of the faulty slave to the new slave connected to the AS-i bus. It is immediately activated and operational.
3	Make sure that: The I/O LED on the display block is not lit, On the display block, the LED of the address that was flashing stays permanently on, The fault sent to the PLC disappears.