Manual

Commands
Chapter 4
4-10
Word 000
Reserve word 000 of the PLC processor output image table when using a
KA2. This means that commands from another station must not be
programmed to control word 000 or any of its bits.
Each PLC/PLC-2 station on a Data Highway can read from or write to
only one specific buffer file at a PLC-3 station. That is the PLC-3 input
file with a number that corresponds to the station number of the
PLC/PLC-2 station. For example, the read/write files assigned to
PLC/PLC-2 stations 1 to 100 (octal) would be as follows:
PLC/PLC-2 Station
Number (octal)
Assigned PLC-3 Input File
for Read/W
rite Access
000
001 I001
002 I002
003 I003
004 I004
005 I005
006 I006
007 I007
I008
I009 (Not assigned)
010 I010
011 I011
012 I012
. .
. .
. .
0770 I077
100 I100
PLC/PLC-2 station numbers are octal, while PLC-3 input files have
decimal addresses. This means that PLC-3 input files with an 8 or 9 in
their addresses are not used for read/write access by a PLC/PLC-2 station.
The only exception to these rules is that station number 000 is assigned
input file I008.
Accessible Data Table Locations
- PLC-3 Processors