Controller Components
Chapter 2
210
Mode Select Switch
The Mode Select Switch (Figure 2.5) places the Processor in one of four
operating modes:
PROG - This switch position places the Processor into the PROGRAM mode
of operation. The User Program instructions are entered into memory in this
switch position. EPROMs are programmed in this mode. All output devices
are disabled. When a programmed EPROM is already in place, this mode is
limited by the Memory Write Protect feature. See section titled Memory
Write Protect for details.
TEST - This switch position allows the User Program to be tested by
enabling inputs but not outputs. This allows debugging of the User Program.
RUN - This switch position allows the Processor to scan and execute the
User Program. Changes to the Data Table or User Program are not permitted
in this switch position. Output devices will be energized according to the
User Program.
RUN/PROG - This switch position allows the Processor to function as it does
in the RUN position. On-line changes to the Data Table or User Program are
permitted in this switch position. When a programmed EPROM is already in
place, this mode is limited by the Memory Write Protect feature. See section
titled Interface Socket for details.
When the keyswitch is in the RUN/PROG position, the Processor can be placed
in one of three remote modes from the 1770-T3 Industrial Terminal keyboard:
REMOTE RUN/PROGRAM - the default mode. When the keyswitch is
turned to the RUN/PROG position, the Processor automatically enters this
mode. On-line changes to the program and Data Table are allowed in this
mode. When a programmed EPROM is already in place, this mode is limited
by the Memory Write Protect feature. See section titled Interface Socket for
details.
REMOTE PROGRAM - identical to the PROGRAM mode. The program
scan and I/O scan will be halted. All outputs are disabled. Going into this
mode from REMOTE RUN/PROGRAM will reset an I/O fault, and clear a
memory parity error.
REMOTE TEST - identical to the TEST mode. The program scan will be
running, but all outputs are disabled. Going into this mode from REMOTE
RUN/PROGRAM will reset an I/O fault as does physically changing the
keyswitch position from RUN/PROG or RUN to TEST.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
