INTRODUCTION
I-E96-302B
2 - 1
SECTION 2 - DESCRIPTION AND OPERATION
INTRODUCTION
This section explains the operation of the FBS module. The
module does two major tasks. It provides an interface by which
the controlling module (multi-function processor or
multi-function controller module (MFP/MFC)) can input analog
process data from external devices or smart transmitters. It
also serves as a communication link between the INFI 90 con-
trol system and field devices.
The FBS module has three modes of operation: FSK field bus
mode, FSK analog point-to-point mode and baseband analog
point-to-point mode.
SYSTEM OPERATION
The digital interface, made up of the FBS module and the con-
trolling module, provides a communication path between an
INFI 90 operator interface and Bailey-Fischer & Porter smart
transmitters as shown in Figure
. Commands can be sent
from an operator interface to change transmitter parameters or
to rerange a transmitter output. In return, the transmitters
send process and status data to the operator interface through
the FBS module and controlling module (MFP/MFC). The con-
trolling module communicates with the FBS module over the
I/O expander bus.
MFP/MFC Module
The controlling module (MFP/MFC) directs the operation of the
smart transmitters and holds their operating strategy. The
configuration of function code 133 (smart transmitter defini-
tion) in the controlling module determines the operating strat-
egy of each smart transmitter. Function code 132 (analog
input/slave) reads the inputs of the FBS module. Operation
Figure 2-1. Field Bus Mode
T P 2 5 1 6 6 C
IMFBS01
NTFB01
SMART TRANSMITTERS USING
FSK COMMUNICATION AND
SENDING DIGITIZED DATA
FIELD BUS
BCN
PTS
EQN
PTS
TBN
PTS
