Handling Of More Than One Nautopilot Operator Unit In A Steering System (Master -- Slave -- Application); Figure 58: Master-- And Slave Nautopilot Operator Units - Raytheon NautoPilot NP 5100 Operator's Manual

5.3 Handling of more than one NautoPilot Operator Unit in a steering system
(Master - - Slave - - application)
It is possible to install more than one NautoPilot Operator Unit in a steering system.
However, only one of the NautoPilot Operator Units is a master, whilst the others are
designated as slaves.
A slave NautoPilot Operator Unit can be switched into active mode or inactive mode.
If a slave is active all other NautoPilot Operator Units in a steering system are inactive,
even the master NautoPilot Operator Unit (except its calculation task).
"OU Display" (see also section 5.3.1) is indicated at the inactive NautoPilot Operator
Units, at the top left corner of the display (above the control mode).

Figure 58: Master-- and Slave NautoPilot Operator Units.

Only the master NautoPilot Operator Unit performs (calculates) the control function of a
steering control system. The active slave NautoPilot Operator Units serves for data/
value input and visual monitoring only -- all inputs, as well as configuration values, can
be performed.
The lower LED (below the "Heading", "Course" or "Track" buttons) can only light up
yellow for steering systems with more than one NautoPilot Operator Unit.
An acknowledgement of alarms/status messages is possible at all NautoPilot Operator
Units (independent of master or slave).
4002.DOC010102
OPERATION
NautoPilot 5000 Series
NP5x00 Slave
Exceptions or additional information to applications with several
NautoPilot Operator Units are given in the corresponding
sections.
NP5x00 Master
130
NP5x00 Slave
Edition: September 2014