Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 210)

12–7 Uploading and Downloading with A-B Processors
Publication 1770Ć6.5.16 - October 1996
Downloading to a PLCĆ2 Processor
1. Place the PLC-2 processor in Download mode by setting the
mode selector switch on the PLC-2 processor to the RUN/PROG
or PROG position.
!
ATTENTION: Leaving outputs on during a
download can cause unexpected machine motion.
If you are downloading to a PLC-2/20 or
mini-PLC-2 processor in RUN or RUN/PROGRAM
mode, the only way to turn an output off is to use
physical write to set all output image bits to 0.
2. Place the PLC-2 processor in Download mode using
enter download mode. (For more on enter download mode,
see page
7–9 ). This command:
•
inhibits program scan
•
inhibits access by a programming terminal
•
does not allow the PLC-2 processor to send commands
•
allows the PLC-2 processor to only receive downloading and
diagnostic commands
•
places a PLC-2/05, -2/15, -2/16, -2/17, or -2/30 processor in
program mode. If the last state switch at each I/O chassis is
set to OFF, the outputs are disabled
•
lets the outputs of a PLC-2/20 or a mini-PLC-2 remain
enabled if the mode selector switch is in the Run or
Run/Program position
3. If necessary, set the data table size using set data table size.
(For more on set data table size, see page
7–24 .)
Important: Do not write beyond your PLC-2 memory.
If you need to change the size of your PLC-2
data table to download the new program, refer to
your PLC-2 processor user manual.
4. Download the information using one or more physical writes.
(For more on physical write, see page
7–14 .)
Downloading programs
When you download a program, write zeros into the unused
portion of memory following the program.
5. Verify that the information transferred properly using
physical read. (For more on physical read, see page
7–13 .)
6. Exit Download mode using exit download/upload mode
(For more on exit download/upload mode, see page
7–10 .)
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