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Configuring the Island Bus
890USE19600 April 2004 33
The RST Button
Summary Use the RST function to reconfigure your island after you have added a new I/O
module to a previously auto-configured island. If a new I/O module is added to the
island, pressing the RST button forces the auto-configuration process. The updated
island configuration data is automatically saved. RST works only after the island has
been successfully configured at least once.
Physical
Description
The RST button is located immediately above the CFG port, and behind the same
hinged cover:
Holding down the RST button for two seconds or longer causes the island to auto
configure and the Flash memory to be overwritten.
Engaging the
RST Button
To engage the RST button, use a small screwdriver with a flat blade no wider than
2.5 mm (.10 in). Do not use a sharp object that might damage the RST button or a
soft item such as a pencil that might break off and jam the button.
When you push the RST button for at least two seconds, the NIM reconfigures the
island bus as follows:
RST button
Stage Description
1 The NIM auto-addresses the I/O modules on the island and derives their
factory-default configuration values.
2 The NIM overwrites the current configuration in Flash memory with
configuration data that uses the factory-default values for the I/O modules.
3 It re-initializes the island bus and brings it into operational mode.
Note: Network settings such as the fieldbus baud and the fieldbus node ID remain
unaffected.