Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 188)

Block Transfer
Chapter 10
10Ć5
Table 10.B
The First Available Address in Timer/Counter Area of Data Table
# I/O Racks First Available Address in
Timer/Counter Area
1
2
3
4
5
6
7
020
030
040
050
060
070
200
The module address is stored in BCD by r=rack, g=module group and
s=slot number. When block transfer is performed, the processor searches
the timer/counter accumulated area of the data table for a match of the
module address.
The block length is the number of words that the module will transfer. It
depends on the type of module and the number of channels connected to it.
The number of words requested by the instruction must be a valid number
for the module: i.e. from 1 up to the maximum of 64. The maximum
number is dependent on the type of module that is performing block
transfer. The block length can also be set at the default value of the
module, useful when programming bidirectional block transfers. For some
modules, the default value allows the module to decide the number of
words to be transferred. See the data sheet or user’s manual pertaining to
the module for additional information.
The block length heading of the instruction will accept any value from
00–63 whether or not valid for a particular module. A value of 00 is
entered for the default value and/or for a block length of 64.
The block length is stored in binary in the byte corresponding to the
module’s address in the output image table.
The file address is the first word of the file to which (or from which) the
transfer will be made. The file address is stored 100
8
words above the
data address of the instruction. When the file address is entered into the
instruction block, the industrial terminal computes and displays the ending
address based on the block length.
When reserving an area for a block transfer file, an appropriate address
must be selected to ensure that block transfer data will not write over
assigned timer/counter accumulated and preset values. The file address
cannot exceed address 17777
8
.
10.2.2
Block Length
10.2.3
File Address