Run/Stop Switch Operation; Logic/Configuration Source And Cpu Operating Mode At Power-Up - Emerson PACSystems RX3i User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual
GFK-2222AK
write-to-flash transfer is not completed due to canceling, power cycle, or some other
intervention, the CPU will clear flash memory. Similarly, if a read-from-flash transfer is
interrupted, user memory will be cleared.
4.6.1

RUN/STOP Switch Operation

The RUN/STOP Switch is a 3-position switch which operates as follows:
Switch
Position
RUN I/O or
RUN I/O
Enable
RUN or
RUN Output
Disable
STOP
The RUN/STOP Switch can be disabled in the programming software HWC. The memory
protection function of the switch can be disabled separately in HWC. The RUN/STOP
Switch is enabled by default. The memory protection functionality is disabled by default.
The Read Switch Position (Switch_Pos) function allows the logic to read the current
position of the RUN/STOP Switch, as well as the mode for which the switch is configured.
For details, refer to PACSystems RX3i and RSTi-EP CPU Programmer's Reference Manual, GFK-
2950.
4.7 Logic/Configuration Source and CPU Operating
Mode at Power-Up
Flash and user memory can contain different values for the Logic/Configuration Power-up
Source parameter. The following tables summarize how these settings determine the
logic/configuration source after a power cycle. CPU mode is affected by the Power-up
Mode, the RUN/STOP Switch and Stop-Mode I/O Scanning parameters, the physical
RUN/STOP Mode Switch position, and the Power Down Mode as shown in sections 4.7.1
and 4.7.2.
CPU Operation
CPU and Sweep Mode
The CPU runs with I/O sweep
enabled.
The CPU runs with outputs
disabled.
The CPU is not allowed to go
into RUN Mode.
October 2019
Memory Protection
User program memory is
read only.
User program memory is
read only.
User program memory can
be written.
Section 4
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