Rockwell Automation 1336T PLC Comm. Adapter, Series B, FRN 2.xx-3.xx User Manual
Page 58
3–14
Publication 1336 FORCE–5.13 –– September, 1998
The components of the block transfer instructions are:
This component:
Specifies:
Rack
The rack number. The RIO switch settings on the PLC
Communications Adapter Board determine the rack number.
Group
The group number of the first group in the rack associated
with the PLC Communications Adapter Board. In the PLC
5/15 and 5/25 example, the rack has been set up as a full
eight group rack. Therefore, the first group is 0. If you select
a 1/2 rack, the first group in the rack is 0, 2, or 4. If you
select a 1/4 rack, the first group in the rack is 0, 2, 4, or 6.
Module
The module number associated with the block transfer in the
associated slot. This is always 0.
Control Block
The control block, which is a pre–defined set of words that
contain bit information associated with the PLC block
transfer functions.
In the PLC–5/15 and 5/25, the control block requires five
contiguous words. In the PLC–5/15 and 5/25 example, words
N111:0 through N111:4 are reserved for the bit array in the
BTW block and words N111:90 through N111:94 are
reserved for the BTR block.
In the PLC–5/40 and 5/60, the control block may be either an
integer type and require five contiguous words or a block
transfer type and require one element, as shown in the
previous figure.
Data File
The address of the message sent by the BTW or received by
the BTR block. The data file contains both header and data
information. The number of words required for the data file
depends on the type of message being sent. In the PLC–5/15
and 5/25 example, N111:5 is the first word in the data file for
the BTW block and N111:50 is the first word for the BTR
block. Refer to the message description section in Chapter 7,
Block Transfer Services, for the header and data that must be
included in the data file.
Length
The length of the block transfer message in words. This
length depends on the message being sent. The BTW and
BTR instruction lengths may be different. Refer to the
message examples for the minimum lengths required for each
message.
Continuous
Whether the block transfer block is to be executed
continuously or only when the run is true. You should always
set this to N.