Rockwell Automation 1756-RIO ControlLogix Remote I/O Communication Interface Module User Manual - Manual (Page 150)

150 Publication 1756-UM534B-EN-P - November 2010
Appendix B Adapter Mode I/O Map
Block Transfer Write Data on Monitored or Active Racks
The data mapped for block transfer writes consists of two status words
followed by up to 64 words of data on active or monitored racks. Block
transfer write data on active and monitored racks are mapped to ControlLogix
inputs.
Offset 0 bits 0…7 contain a free-running counter that increments each time a
block transfer read executes successfully.
The 1756-RIO module sets the BTR error bit; offset 0, bit 11, when an error
occurs executing a block transfer read. It clears the bit when the block transfer
read enable bit occurs.
When a block transfer read error occurs, offset 0, bit 8…10 contain an error
code.
The error codes are as follows.
Block Transfer Error Codes
Error Code Description
0 OK
1 Time-out
0 1 2 3 4 5 6 7 8 9...
BTR Block Transfer Write Data
1st
16-bit
Word
BTW
44843
44847