Allen-Bradley controllogix 1756-L63, User Manual

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Publication 1756-UM001E-EN-P - August 2002
Communicate Over a Remote I/O Network 20-13
Write Configuration or Output Data To a Block Transfer Module
1. Enter the following rung:
2. Enter the following rung:
The application writes configuration and output data to dints_output , which is an array of DINTs. Before the controller sends the data
to the module, the FAL instruction moves the values to int_buffer_write . This converts them to 16-bit integers (INTs). (Only include the
msg_read.EN tag and associated instruction if you also send a block transfer read message to the same module.)
42463
Tag Name: Description: Data Type: Scope:
msg_read block transfer read message to the same
module MESSAGE
name_of_controller
(controller)
msg_write block transfer write message MESSAGE
name_of_controller
(controller)
dints_to_ints converts the 32-bit integers from the Logix5000
controller to 16-bit integers for the BT module CONTROL
name_of_controller
(controller)
FAL Length number of elements to convert immediate value equal to
length
int_buffer_write array that stores the data to send to the BT
module as 16-bit integers INT [
length
]
name_of_controller
(controller)
dints_output array that stores the output data that other
instructions produce for the module DINT [
length
]
name_of_controller
(controller)
/
msg_read.EN
/
msg_write.EN
RES
dints_to_ints
EN
DN
ER
File Arith/Logical
Control
dints_to_ints
Length
Position
0
Mode ALL
Dest int_buffer_write[dints_to_ints.POS]
Expression
dints_output[dints_to_ints.POS]
FAL
Where: Is the:
length
number of elements to transfer
After the FAL instruction converts the DINTs to INTs, the MSG instruction sends the data in int_buffer_write to the module.
42463
dints_to_ints.DN
EN
DN
ER Type - Block Transfer Write
Message Control
msg_write ...
MSG
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