Bailey IMFEC11 - Section 2 - Description and Operation; Introduction; General Operation; Mfp;Mfc Module Operation

INTRODUCTION
WBPEEUI240756A0 2 - 1
SECTION 2 - DESCRIPTION AND OPERATION
INTRODUCTION
This section explains the operation of the IMFEC1  Analog
Input Module (FEC). The module does two major tasks. It pro-
vides an interface by which the controlling module (multifunc-
tion processor or multifunction 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 OPEN control system and field devices.
The IMFEC12 module accepts inputs from conventional trans-
mitters (BC, EQ and PT) and standard analog inputs of 4 to 20
milliamps, 1 to 5 VDC, 0 to 1 VDC, 0 to 5 VDC, 0 to 10 VDC
and -10 to +10 VDC. The IMFEC11 has all the functionality of
the IMFEC12 module but also provides FSK communications
for interface to Bailey-Fischer & Porter smart transmitters and
other smart devices.
GENERAL OPERATION
Upon receiving initialization from the controlling module
(MFP/MFC), the FEC module stores that information in mem-
ory and checks the configuration of each input channel. If all
input channels check good, operation begins. If the FEC mod-
ule detects a configuration error, that error appears in the
module status report.
Under normal operation, the controlling module sends trans-
mitter commands and requests process input data and status
information from the FEC module. The FEC module continu-
ously reads each input channel, does the necessary conver-
sions and stores the data in memory. When the controlling
module makes a request for data, the FEC module sends it the
most current information that it has in memory.
If a communication failure with one of the transmitters occurs,
the FEC module works to restore communication while con-
tinuing normal operation. It checks the transmitter configura-
tion upon restoring transmitter communication and normal
process control continues.
MFP/MFC MODULE OPERATION
The controlling module (MFP/MFC) directs the operation of the
transmitters and holds their operating strategy. Function code
132 (analog input/slave) reads the analog inputs of the FEC
module. The configuration of function code 133 (smart trans-
mitter definition, for IMFEC11 only) in the controlling module