ABB Bailey* network90 Loop Interface/Bus Interface(LIM/BIM)
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NOTES highlight procedures and contain information which assists the operator in understanding the information con.
tained in this manual.
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General
Installation - gives step-by.step procedures for
preparing the LIM/BIM'pair for installation in
The Loop and Bus Interface Modules(LIM/BIM) pro-
the PCU.
vide the principal communication interface between
NETWORK 90 Process Control Units and the Plant
Operation - provides the user with normal,
Communication Loop (PCL). Information is passed
everyday operating instructions.
over the Loop to other nodes. A node can be a Pro-
cess Control Unit (PCU),Management Command
Troubleshooting - explains possible error
System (MCS), Operator Interface Unit (OIU),Plant
situations and correctivemeasures; also
Loop Gateway(PPG) or Computer Interface Unit (CIU).
includes service/replacement information.
A maximum of 63 nodes, in any combination, can be
on the Loop.
How to Use this Manual
The basic function of the BIM is to gather data
from modules and transfer it to the LIM. The basic
Read the introductory material first. Then, proceed to
function of the LIM is to examine the data and
the Theory of Operation section to get a fundamen-
transmit it to the assigned destination on the Loop.
tal understanding of how the modules work. Next,
Detailed theory of LIM/BIM operation is covered in the
read the Installation section. This should be read
Theory of Operation section of this document.
thoroughly, and all preparatory steps performed,
before putting the modules into operation. After
This document is divided into the following
installing the modules, read the Operation section to
sections:
find out what to look for in the normal and abnormal
operating modes. Refer to the Troubleshooting sec.
tion if any abnormal situations occur after putting the
Theory of Operation - provides an in-depth view
modules into operation.
of how the LIM/BIM pair work.
Glossary
Common Database
Data shared by LIM/BIM pairs on the Plant Loop.
Exception Report
Information update generated when a point change is greater than a speci-
fied significant amount.
Frame
Valid string of bytes on the Plant Loop.
Node
Any drop on the Loop; can be a Management Command System, Operator
Interface Unit, Computer Interface Unit, Plant Loop Gateway or Process
Control Unit.
Packing
The process of grouping multiple Exception Reports into one message.
Plant Communication Loop
The unidirectional highway for serial data shared by all nodes on the Loop.
Polling Rate
The time interval that the BIM checks the modules for Exception Reports.
Receive Data
Data received by destination PCU.
Synchronization Time
The time it takes for internal circuitry to readjust when a module goes into or
comes out of bypass.
Transmit Data
Data sent by one PCU to another.