Revision 6 HC900 Process & Safety Controller User and Installation Manual 161
21 April 2017
Controller Mode Transitions
Mode changes are controlled primarily by positioning of the MODE switch (Figure 85) on the controller
module or RSM, and secondarily by selection of mode names on operator interface displays. That is, the
Mode switch takes precedence. In the RUN (Locked) position or in the PROG (Locked) position, selecting
a mode name at the operator interface has no effect on the operational mode. In the RUN/PROG position,
the mode may be changed from any mode to any other mode.
The effects of the Mode switch operator interface selections are described in Table 23. The effects on
controller operation for each mode transition are described in Table 24.
Figure 85 – Mode Switches: Controller (left), RSM (right)
Table 23 – Mode Switch Functions
Mode Selections at
Operator Interface
In this position, the Controller is locked in the RUN mode of
operation. Run mode configuration changes are disabled
and mode cannot be changed at any operator interface.
SIL application must operate in this position. SIL
requirements may not occur in other operational modes.
This RUN-locked mode is the Safety mode for Safety
controllers and the proper normal operational mode for All
controllers.
In this position, the mode can be changed at any operator
interface using screen selections PROGRAM, RUN, or
OFFLINE. The Run/Program mode should be used only
when changes are anticipated. The Run-Locked mode is
the preferred operational mode to prevent any unintentional
changes.
In this position, the Controller is locked in the PROGRAM
mode of operation. Mode cannot be changed at any
operator interface.
While in PROG position the S1 serial port is set to
Honeywell ELN protocol. This temporarily overrides the
configured settings for S1 port. With your PC’s serial com
port connected to S1, use Designer Software’s Utilities to
view any setting of any controller port (such as network IP
address) and change if needed. Refer to Designer
Software documentation for details. Placing the
Run/Program switch in RUN or RUN/PROG mode returns
S1 to its configured protocol and settings.
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