DESCRIPTION AND OPERATION
FUNCTIONAL OPERATION
2 - 2
WBPEEUI240756A0
®
determines the operating strategy of each smart transmitter.
Operation begins when the controlling module is placed in the
execute mode with function code 132, and optionally with
function code 133, in its configuration. When the controlling
module enters the execute mode, it downloads the operating
strategy to the FEC module.
FUNCTIONAL OPERATION
The FEC module can be divided into four functional blocks for
the IMFEC12 and five functional blocks for the IMFEC11.
Figure
shows a block diagram of the IMFEC1
Analog
Input (FEC) module. The functional blocks are:
•
Module inputs/outputs (AC coupler and FSK multiplexer
for the IMFEC11 only).
•
Communication circuitry (IMFEC11 only).
•
Microprocessor and control logic.
•
Analog-to-digital converter.
•
I/O expander bus interface.
The following sections explain the operation of the functional
blocks that make up the IMFEC1
circuitry.
Figure 2-1. Functional Block Diagram
T00915A
ADC
CONTROL
DUAL SLOPE
ADC
ANALOG
MULTIPLEXER
CURRENT/
VOLTAGE
CONVERTER
FSK
MULTIPLEXER
FSX TXD/RXD
I/O EXPANDER BUS
MICROPROCESSOR
DATA/STATUS
BUFFERS
MEMORY
I/O FIFO
TRANSMITTER
INPUTS
ANALOG
INPUT
FILTERS
TRANSMIT
RECEIVE
GATING
FSK
COMMUNICATION
I/O
EXPANDER
BUS IC
AC COUPLER
ANALOG-TO-DIGITAL
CONVERSION
IMFEC11 FSK
COMMUNICATION
MICROPROCESSOR
AND
CONTROL LOGIC
MODULE I/O
