Woodward MicroNet Simplex User Manual

Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 14
MicroNet Plus
 MicroNet 14 or 8 VME Slot
Chassis
 Dual CPU's for redundant
operation
 Single CPU for simplex
operation
 CPU5200/ CPU5200L and
CPU P1020
 Simplex or Redundant I/O
modules
 Simplex or Redundant Power
 Redundant smart fans
5
i
RS2-TX
+24V +24V*
FAULT
LA1
LA3
LA2
LA4
LA5
LA6
01
6
78
DA/STAT
13
2468
5
FAULT
12
LA7
LA8
7
P
12
34
Figure 2-1. MicroNet Plus Redundant System
2.1.2—Redundant CPU Theory
The MicroNet Plus control system uses redundant CPU5200/CPU5200L modules that must be located in
the first and last VME slots (A1 and A8 / A14). The chassis has a single motherboard and houses 2 power-
supplies, 2 CPUs, and 12 I/O slots. The CPUs share a single data path to the VME modules and each
other.
In a redundant system, there are two CPU modules, running the same application program, receiving power from
the same pins on the VME backplane, and with access to the I/O modules over the same VME bus. The CPU
modules communicate their health to each other over the VME bus, and arbitrate for control of the bus. The CPU
which is in slot 1 and in good “health” first, gains control of the I/O modules, and is called the System Controller or
SYSCON. The other CPU is then the backup or STANDBY CPU. The SYSCON sends all necessary state
information to the backup CPU, allowing it to take control of the I/O modules if the SYSCON fails.
The following conditions will cause a failover from the SYSCON CPU to the backup STANDBY CPU:
 Failure of the on board CPU module power supplies
 Failure of the processor core, including the processor, RAM, flash, oscillator, and supporting internal
circuitry.
 A reset of the SYSCON CPU, caused by the front panel or remote Resets
 An application requested failover
 An application stop
Released

Woodward MicroNet Simplex Specifications

General

Brand	Woodward
Model	MicroNet Simplex
Category	Controller
Language	English