DESCRIPTION AND OPERATION
MODULE BUS/CONTROLWAY
I-E96-221A
2 - 3
MODULE BUS/CONTROLWAY
Controlway is a one megabaud peer-to-peer communication
link capable of supporting up to 32 drops. The Controlway
interface is provided by a custom Bailey Controls integrated
circuit, that links the IMCPM02 module to Controlway. It has
full direct memory access (DMA) capabilities (allowing for
quicker operation), and two redundant, independent channels.
Module bus is a nonredundant version of the peer to peer com-
munication channel that operates at 83.33 kilobaud.
There are two separate traces on the MMU backplane circuit
for Controlway. Data is transmitted over both channels simul-
taneously and received in separate receivers where it is
checked for integrity. A failed channel on the Controlway is
flagged and shut down to allow Controlway communication to
continue on the other channel.
As the point data between modules travels on the bus, the
Controlway does a bit-by-bit comparison that provides collision
avoidance maximizing efficiency and throughput.
LEDS
The IMCPM02 module has one two-color status LED on the
faceplate to indicate the execute/failed status of the IMCPM02
module. It has eight red status LEDs on the faceplate for diag-
nostic purposes and an activity indicator. The LEDs are
arranged vertically and numbered from one through eight, top
to bottom.
In normal operation mode, the IMCPM02 module uses the nine
LEDs on the faceplate to indicate its status. The two-color sta-
tus LED indicates the mode of the IMCPM02 module: green for
execute mode and red for failed mode. When in execute mode,
the IMCPM02 module uses LEDs 1 through 8 as activity indi-
cators.
When the IMCPM02 module is in failed mode, LEDs 1 through
8 display a code indicating the error condition (Refer to
in Section 5). In diagnostic mode, the LEDs
indicate the status of the diagnostic test (Refer to
DIPSWITCHES/JUMPERS
The IMCPM02 module has two configurable dipswitches and
eight jumpers. Each dipswitch has eight poles. Dipswitch SW2
sets module options. Dipswitch SW3 sets the module address.
