Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 129)

Remote I/O Communications 8–37
Publication 2706-6.1
Triggering a Message using a Block Transfer Write
The following shows the format of a bit trigger using block transfers
in Bit Trigger mode. If Block Transfer Write Length is set to 0 in the
PLC program, a default length of 32 is used.
WORDS
1
through
31
WORD 0
Block Transfer Write File
Priority Message Number
Priority Section
Round Robin Section
Return Message Number (Block Transfer Read)
The following shows the format of the return message number sent
to the PLC when using a block transfer read in Bit Trigger mode. If
Block Transfer Read Length is set to 0 in the PLC program, the
DL40 Plus returns 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)
The following shows the format of clock/date data returned to the
PLC when using block transfers in Bit Trigger mode. If Block
Transfer Read Length is set to 0 in the PLC program, the DL40 Plus
returns 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