Rockwell Automation 2706 DL40 HARDWARE USER MANUAL - Manual (Page 120)

Chapter 10
Using Remote I/O
10 – 28
WORDS
1
through
31
WORD 0
Block Transfer Write File
Priority Message Number
Priority Section
Round Robin Section
Return Message Number for Message Being Displayed to PLC
(Block Transfer Read)
Note: If Block Transfer Read Length is set to 0 in the PLC program, the
DL40 will return 2 words.
WORD 1
17 16 15 14 WORD 0
Acknowledge Bit
Block Transfer Read File
Diagnostic Code
Message Number
Clock/Date Data Bit = 1
Return Clock or Date Data to PLC (Block Transfer Read)
Note: If Block Transfer Read Length is set to 0 in the PLC program, the
DL40 will return 2 words.
WORD 1
17 16 15 14 WORD 0
Block Transfer Read
File
Clock/Date Data Bit = 1
Diagnostic Code Hour/Month
Minute/Day Second/Year
The Handshake Bit provides an indication to the sender (either the DL40 or
the PLC) that the Image Table (either Output or Input) was received by the
receiver.
For complex system configurations, there could be too little time to insure
that data is received by the PLC. In this case, the Handshake feature can be
selected to insure that data is not lost. When activated, the Handshake feature
holds data until the DL40 receives acknowledgment from the PLC that it has
received the data.
The Handshake Bit