Adapter Status Table - Allen-Bradley 1784-KTX Reference Manual

Adapter Status Table

Allen-Bradley Parts
For each of the 128 possible adapter addresses, there are 3 contiguous
bytes of data in the dual port:
adapter configuration byte
adapter fault byte
adapter retry count byte
Remember, each logical rack can be divided in quarters known as
quarter-racks.
Adapter Configuration Byte
The host uses the adapter configuration byte to:
verify that the adapter is in the scan list
verify that the adapter is responding to scanner commands
determine the physical size of the the adapter's rack
distinguish between node adapters and standard adapters
This table defines the bits of the adapter configuration byte.
Bit # Mnemonic Description
0 in_scan When set, this bit indicates that the adapter is in the current
scan list.
1 exists When set, the adapter has replied to scanner commands.
2 known Reserved for internal scanner use.
3-4 size These bits indicate the physical device size of the
adapter's rack:
5 node_adapter When set, this bit indicates that the adapter is a node
adapter device.
6-7 undefined Reserved for future use.
Chapter 6
Reporting KTx Scanner Status
size bits physical device size
0 quarter rack
1 half rack
2 three quarter rack
3 full rack
6-3