Allen-Bradley 1784-KTX Reference Manual page 78

Appendix A
Dual port Layout
Address Mnemonic
:00E host_dead_counter
:00F reserved2
:012 alive_flag
:013 duplicate_node
:014 off_ktx
:015 stopped_flag
:016 module_state
:017 cos_link_address
:01B unused
:07C num_adapter_addresses
:07D num_faulted_adapters
:07E operating_status
A-2
Size Host KTx
1
3
1
1 R W
1
1
1 R W
1 R/W R/W
65H
1 R R/W
1 R R/W
2 R R/W
Description
If zero, the host dead counter is disabled. A non-zero
value defines the timeout period:
20ms * value
The host must set the alive_flag = 0 before the timeout
expires or the scanner will declare the host dead.
See host_dead_counter.
Set to 1 if a duplicate scanner is detected.
If there is a runtime error (CRC or RAM test), the error
code will be written here.
If the host enables CHANGE OF STATE detection, the link
address of the adapter that had a change of state will be
written here by the scanner. The host must clear this by
writing an 0FFh.
Number of adapters on link
Number of adapters on link that are currently faulted
This byte is used by the KTx to indicate to the host the
state of the module by setting/clearing the bits. The bits
(when set) are defined as:
Bit 0: Program mode
Bit 1: Test mode
Bit 2: Run mode
Bit 3: Debug mode
Bit 4: Unsolicited BT received on link
Bit 5: BT pending
Bit 6: Fault exists
Bit 7: Fault changed
Bit 8: Unsolicited BT read reply
Bit 9: Unsolicited BT write reply
Bit 10: Confirmation queue is full
Bit 11: Unknown host interrupt type
Bit 12: Scanner declared host dead
Bit 13: Input Image Table changed state
Bits 14-15: unused