Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 172)

ASCII Module
PLC-2 Family Processors
Appendix A
AĆ4
Figure A.2
Block Format Block Transfer Instructions
EN
BLOCK XFER READ
DATA ADDR:
MODULE ADDR:
BLOCK LENGTH:
FILE: 030
100
01
110 - 110
DN
010
07
110
07
EN
BLOCK XFER WRITE
DATA ADDR:
MODULE ADDR:
BLOCK LENGTH:
FILE: 030
100
01
110 - 110
DN
010
06
110
06
A block transfer instruction is programmed
in the ladder diagram by depressing the
[BLOCK XFER] key followed by [1] (for a
READ) or [0] (for a WRITE). The appropriate
read or write block, as shown, will
appear on the industrial terminal screen.
Numbers shown are default values.
Numbers in shaded areas must be
replaced by user-entered values. The
number of default address digits initially
displayed, 3, 4, or 5 will depend on the
size of the data table. Initially displayed
default values are governed by the I/O
rack configuration.
Data Address : First possible address in accumulated value area of data table.
Module Address : Rack, module group, and slot number.
Block Length : Number of words to be transferred. (00 can be entered for default value or for 64 words).
File :
Enable Bit (EN) : Automatically entered from the module address. Set on when rung containing the instruction
Done Bit (DN) : Automatically entered from the module address. Remains on for 1 scan following successful
is true.
transfer.
11121
Address of first word in the file. Storage is 100
8
above the data address.
Data and Module Addresses
The data address is the block transfer instruction address. It is used to
store the I/O rack address of the ASCII module (module address). The
module address is stored in BCD by rack, module group, and slot number
and identifies the module’s location in the I/O rack. You enter the data
address in the instruction after you enter the instruction.
The data address of a block transfer instruction should be the first
available address in the timer/counter accumulated area of the data table.
This address is 030 for the Mini-PLC-2/15 controller. For the PLC-2/30
controller, this address depends on the number of I/O racks connected to
the processor module, i.e. address 020 for one I/O rack, 030 for two racks,
etc. to 070 for six racks and 200 for seven racks. When more than one
block transfer module is used, the data addresses should be consecutive.