Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 20
The value of redundancy is dependent on the ability of the application to detect the failure. For analog and
actuator outputs, current and/or voltage read back is provided. For discrete outputs, fault detection requires
sensing the relay contact state.
2.4—MicroNet Plus Simplex Operation
To use the MicroNet Plus for simplex operation, the CPU must be in the first user slot (slot A1).
In the GAP application, select the MICRONET14 or MICRONET8 chassis and use a CPU module in
slot A1.
The CPU can only be the CPU5200/CPU5200L or CPU P1020.
Assign communication and I/O modules according to your application needs.
Compile and code your application using the Woodward GAP/Coder tools.
Use the AppManager Service Tool to load and start the application over Ethernet.
After starting the application, the CPU will initialize the I/O and run the real-time application.
System initialization is complete when all the I/O module fault LED's are cleared.
Expansion Chassis Notes
The GAP application may also define expansion chassis by using the Remote Real Time Network (Remote
RTN) module in slot A1 of each expansion chassis.
Note: MicroNet Plus based systems require that the expansion chassis use the Remote RTN
module in slot A1. The CPU in the main chassis controls the expansion chassis through its
redundant RTN port connections to the Remote RTN module.
2.5—Module Replacement
Chapter 15 contains Installation and Replacement procedures for VME Modules, power supplies, relay
boxes, and other devices. Individual CPU and I/O module sections in Chapters 6 through 9 are an additional
reference for installation and replacement information.
Sections 5.2 and 5.4 contain additional details for power supply installation and replacement. Note that
power must be removed from the power supply input before a module is removed or inserted.
BEFORE REMOVAL
!
RESET
MODULE
Live insertion and removal of the CPU5200, CPU P1020, and Remote
RTN modules is allowed in a MicroNet Plus chassis. These modules
should be reset immediately before removing them from the chassis.
This notifies the module that it will be removed and provides a graceful
failover to another healthy CPU or Remote RTN module if available.
2.6—Latent Fault Detection
Because a redundant system can tolerate some single faults, it is possible for a fault to go undetected.
Undetected faults are termed latent faults. If another fault occurs when a latent fault exists, the second fault
could cause a shutdown. It is important to detect a latent fault in a redundant system so that it may be
repaired before another fault occurs. Without a fully triplicated system it is not possible to detect all latent
faults, however most faults can be detected. For single or redundant I/O points, fault detection is dependent
on the application software to detect its I/O faults.
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