Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 72
Chapter 7.
Communication
7.1—Remote RTN Module
7.1.1—Module Description
The MicroNet Remote Real Time Network (RTN) module is designed to be located in an expansion rack.
The module’s primary function is to gather data from local I/O modules and communicate this data to the
main rack CPUs while providing redundant failover control of the rack in which it is located.
The Remote RTN module contains a Motorola MPC5200 processor, 128 MB DDR RAM, 64 MB of flash
memory, a Real Time clock, and various communication peripherals. These peripherals include (2) Real
Time Network ports and (1) service port. This module includes an FPGA to provide VMEbus master/slave
capability, health monitoring, and failover functions necessary for redundant systems.
Remote RTN modules can support both simplex and redundant systems. Every RTN expansion chassis
contains one Remote RTN module located in the first slot (CPU1) of the MicroNet chassis. A redundant
configuration will also have a Remote RTN module located in the CPU2 location (slot 8 or slot 14
depending on the chassis used).
This module was designed and rated for –40 to +85 °C operation in the industrial marketplace.
For Remote RTN module installation and replacement instructions, see the instructions for installing and
replacing the VME module in Chapter 15, Installation and Service, and Section 9.4.3—Installation. This
module will NOT automatically re-initialize to a running state after reset, but the main-chassis CPU
application can re-init this module upon request.
BEFORE REMOVAL
!
RESET
MODULE
Live insertion and removal of this module is allowed in a MicroNet
Plus chassis. This module should be reset immediately before
removing it from the chassis. This notifies the module that it will be
removed and provides a graceful failover to another healthy
Remote RTN module if available.
Operation
For redundant systems, up to (2) Remote RTN modules may be installed into each expansion chassis.
When initialized by the main chassis CPU, the Remote RTN modules will acquire either a SYSCON or
STANDBY status. The Remote RTN module that becomes SYSCON will control the expansion chassis it
is located in. It will synchronize with the STANDBY Remote RTN module and perform any redundancy
functions as necessary. Input and output data from all I/O modules will be managed appropriately and
made available to the GAP Application running in the main-chassis CPUs.
The Remote RTN module communicates with the I/O modules in the expansion chassis, and also
communicates with the CPU modules in the main chassis. Figure 7-3 is a block diagram of a Remote
RTN module. When the power is applied, the Remote RTN module will perform diagnostic tests, before
beginning communications.
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