The fallback mode is defined in the configuration and can be read from the word %KWr.m.0.19.0:
(r = rack address, m = module address)
Operation:
When the AS-i channel changes to STOP:
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With fallback to 0 option: outputs are forced to 0, then communication stops on the medium.
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With maintain state option: outputs are maintained, then communication stops on the medium.
Automatic Slave Addressing
When this function is enabled in the module configuration, it allows the replacement of a faulty slave with a slave of the same type without stopping the AS-i bus, and without the need for special action:
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If the replacement slave is programmed with the same address and has the same profile, it will be automatically inserted in the list of slaves detected, then activated. If this is not the case, the ERR and AS-i LEDs will flash simultaneously.
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If the new slave has never been used (address 0, new slave) and has the same profile, the slave automatically takes on the address of the replaced slave and is therefore in the list of detected slaves and the list of active slaves. If this is not the case, the ERR and AS-i LEDs will flash simultaneously.
These actions are only possible if one and only one slave is faulty in the configuration.
If there is a communication break with the processor, the module switches to OFFLINE mode.
Communication breaks are caused by the following:
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Triggering of the processor watchdog if the TSX SAY 100 module is positioned in the rack holding the processor.
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Disconnection of the X Bus cable if the TSX SAY 100 module is positioned in an extension rack.
In the event of a serious fault on the TSX SAY 100 module (faulty component, etc.) the module stops communicating with the X Bus and with the AS-i Bus. The same type of behavior occurs when a module is removed with the power on.
Removing a Module with Power Switched On
Should a module be removed with the power switched on, communication with the X Bus stops and the processor indicates a module fault.
Communication with the AS-i bus is also interrupted without notice. In this case, the slaves with a watchdog set their outputs in the desired state, and the others remain in position and cannot be set to 0 since the module cannot guarantee communication.
Inserting a module with power switched on
After switching on the TSX SAY 100 module, it waits to receive configuration from the processor or for one of the push buttons ↑↓ or +/- to be pressed, otherwise it remains at a stop.
When an AS-i supply module fault occurs, communication stops with:
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Slaves with a watchdog positioning their outputs in the desired state, except if the slave takes its power from the AS-i.
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Slave commands switch to 0 due to lack of power.
This fault is indicated by the AS-i LED.
There are several ways in which a break in the medium can occur:
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There is a break in the medium as it exits the module:
Behavior is the same as that for a power outage, with all slaves disappearing and a supply fault being indicated.
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There is a break in the medium after the TSX SAY 100 module and the AS-i supply:
All slaves disappear and there is no indication of a supply fault.
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There is a break in the medium after the TSX SAY 100 module, the AS-i supply and some slaves:
Slaves located after the break disappear and there is no indication of a supply fault.
