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ODB database data are ignored
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if requested, it composes the IDB using valid data
A new state is enabled following a change state procedure or if there is a fault.
OPERATE state
This is the normal operating state. In this state, the slave:
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activates the communication watchdog
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checks the MAC address of incoming messages
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all databases are valid
Another state is enabled following a change state procedure or if there is a fault.
FAIL state
In this state the device is blocked due to a serious slave device fault.
This state is also enabled if the slave device is in the OPERATE or PROG state
but has not received any messages for some time (communication watchdog).
In this state, the slave
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disables the communication watchdog
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all outputs are set to safe state (as in the reset hardware condition)
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the previous ID settings are maintained
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ODB database data are ignored
The only way to quit this state safely is to reset the hardware or software.
Topology detection
All GDNet slave devices start off with the network and slave device identifiers
equal to 1 and 0, respectively.
The master device requests the database to these identifiers and can thus know
the number of slave devices in order to set the cycle time, and numbers the slave
devices according to the order in which messages arrive.
EN- 21
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