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Triggering a message using a block transfer write, Return message number (block transfer read) – Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL User Manual

Page 129

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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