Maxiflex P3 PAC User Manual
103
-© Omniflex
UMM126XR18.pdf
The following able shows the actions performed by the Primary Controller during its
different modes of operation.
Mode
Actions
Active
•
Respond to messages addressed to the Redundant Controller Node Address
•
Execute User program
•
Read Inputs from Remote I/O Rack
•
Write Outputs to Remote I/O Rack
•
Check Health status
•
Check for change-over instruction to Standby from Secondary Controller
•
Read Health Status from Secondary Controller
•
Check for the Force Change-over command
Standby
•
Do NOT Respond to messages addressed to Controller Node Address.
•
Check Health status and make it available to Secondary Controller
•
Check for change-over instruction to Active from Secondary Controller
•
Read Health Status from Secondary Controller
Failure
•
This mode of operation is a hardware failure and the Controller is not operable
therefore no action is expected.
Table 13.1: Action List by Operating Mode – Primary Controller
13.4.2 The Secondary Controller
The
Secondary
operates in a similar three modes to the primary controller.
A C T IV E
M O D E
P O W E R U P A N D
S E C O N D A R Y H E A L T H Y
F A IL U R E
M O D E
S T A N B Y
M O D E
S E T S T A N D B Y B Y S E C O N D A R Y
(IF P R IM A R Y H E A L T H Y )
P R IM A R Y U N H E A L T H Y
S E C O N D A R Y
U N H E A L T H Y (I.E .
H A R D W A R E
F A IL U R E )
S E C O N D A R Y
H E A L T H Y
Figure 13.3: Operating Mode of Secondary Controller
Table 2 below
shows
the actions performed by the Secondary Controllers during its various
operating modes.
