INTRODUCTION
INTENDED USER
1 - 2
I-E96-620A
®
INTENDED USER
System engineers and technicians should read this manual
before installing and operating the INPCI01. Refer to the Table
of Contents to find specific information after the module is
operating.
INTERFACE DESCRIPTION
The Plant Loop to Computer Interface enables a host computer
to communicate with any node on the Plant Loop. INPCI01
software enables the computer to acquire data, do process
monitoring, load control strategies and configure modules.
This interface is made up of three INFI 90 Communication
Modules. The Serial Interface Module provides two RS-232-C
ports. The Loop Interface Module provides a serial interface to
the Plant Loop. The Point Table Module transfers information
from the Plant Loop to the module bus and coordinates inter-
action between the LIM and SIM.
Serial Interface Module
This module provides an RS-232-C communication port for a
host computer and an RS-232-C diagnostic port. By design,
this module acts as an RS-233-C type Z interchange, which is a
non-specified optional interchange. Jumpers on board the SIM
circuit board setup the use of signal lines on the RS-232-C port.
Loop Interface Module
The Loop Interface Module handles the Plant Loop communica-
tion protocol. This module buffers and processes all incoming
and outgoing messages. Messages are formatted with source/
destination addresses, header data, circulation count, message
class, data, and cyclic redundancy checks (CRC).
Point Table Module
This module joins the SIM and LIM and does report routing. It
also interprets messages from the Plant Loop, interprets com-
mands from the computer, and stores data values in point
tables.
FEATURES
This interface provides a plant operator with continuous com-
munication to and from the Plant Loop, through a computer.
The INPCI01 protects both the Infi 90 Plant Loop and computer
by buffering the two communication protocols. Through the
INPCI01 software, the computer can read station variables,
values of function blocks, and module status (through module
exception reports). The computer can set station variables and
mode, set logic switches, and report values to modules and
Operator Interface Stations (OIS) configured to read them.