Rockwell Automation 1771-KA2 Communication Adapter Module - Manual (Page 44)

Commands
Chapter 4
4-8
Processor work areas
Input image table
Word 027
Later paragraphs describe the limitations in controlling each of these
areas. Access to all other data table areas is subject to the requirements of
the programmer.
Processor Work Areas
The processor work areas for PLC-2 family processors are addresses
000-007 and 100-107. These areas are used for specific processor
functions and are not accessible to commands from a station
communication adapter module. The processor prevents an attempt to
write data into this area from a remote station KA2. Note also that an
attempt to read data from this area causes all 0’s to be read.
Only privileged commands from a computer can write into or read from
this area of the data table.
Input Image Table
The input image table areas for these processors are addressed as follows:
PLC-2 processor: 110-127
PLC-2/30 processor: 110-177
PLC-2/20 processor: 110-177
Mini-PLC-2 processor module: 110-117
Mini-PLC-2/05 processor: 110-117
Mini-PLC-2/15 processor: 110-117
Please see appropriate processor manuals (Table 1.B) for details.
This area of memory is updated each input scan. Any data written into it
will be cleared on the next input scan. This limits use of the input image
table as a storage area for values or bits. Note, however, that the input
image table may be read from or written to another station. This control
restriction applies only when attempting to write data into the input image
table using a command from a communication adapter module.
Word 027
Word 027 has a special function with PLC-2 family processors. For
example, bits 02710-02717 are used for report generation; bit 02700