Bailey infi 90 IMASI02 User manual

®
®
Process Control and
Automation Solutions
from Elsag Bailey Group
E96-304
Analog Slave Input Module
(IMASI02)

WARNING notices as used in this instruction apply to hazards or unsafe practices that could result in
personal injury or death.
CAUTION notices apply to hazards or unsafe practices that could result in property damage.
NOTES highlight procedures and contain information that assists the operator in understanding the
information contained in this instruction.
WARNING
INSTRUCTION MANUALS
DO NOT INSTALL, MAINTAIN, OR OPERATE THIS EQUIPMENT WITHOUT READING, UNDERSTANDING,
AND FOLLOWING THE PROPER Elsag Bailey INSTRUCTIONS AND MANUALS; OTHERWISE, INJURY OR
DAMAGE MAY RESULT.
RADIO FREQUENCY INTERFERENCE
MOST ELECTRONIC EQUIPMENT IS INFLUENCED BY RADIO FREQUENCY INTERFERENCE (RFI). CAU-
TION SHOULD BE EXERCISED WITH REGARD TO THE USE OF PORTABLE COMMUNICATIONS EQUIP-
MENT IN THE AREA AROUND SUCH EQUIPMENT. PRUDENT PRACTICE DICTATES THAT SIGNS
SHOULD BE POSTED IN THE VICINITY OF THE EQUIPMENT CAUTIONING AGAINST THE USE OF POR-
TABLE COMMUNICATIONS EQUIPMENT.
POSSIBLE PROCESS UPSETS
MAINTENANCE MUST BE PERFORMED ONLY BY QUALIFIED PERSONNEL AND ONLY AFTER SECURING
EQUIPMENT CONTROLLED BY THIS PRODUCT. ADJUSTING OR REMOVING THIS PRODUCT WHILE IT IS
IN THE SYSTEM MAY UPSET THE PROCESS BEING CONTROLLED. SOME PROCESS UPSETS MAY
CAUSE INJURY OR DAMAGE.
AVERTISSEMENT
MANUELS D’OPÉRATION
NE PAS METTRE EN PLACE, RÉPARER OU FAIRE FONCTIONNER L’ÉQUIPEMENT SANS AVOIR LU,
COMPRIS ET SUIVI LES INSTRUCTIONS RÉGLEMENTAIRES DE Elsag Bailey. TOUTE NÉGLIGENCE À
CET ÉGARD POURRAIT ÊTRE UNE CAUSE D’ACCIDENT OU DE DÉFAILLANCE DU MATÉRIEL.
PERTURBATIONS PAR FRÉQUENCE RADIO
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FRÉQUENCE RADIO. DES PRÉCAUTIONS DEVRONT ÊTRE PRISES LORS DE L’UTILISATION DU MATÉ-
RIEL DE COMMUNICATION PORTATIF. LA PRUDENCE EXIGE QUE LES PRÉCAUTIONS À PRENDRE
DANS CE CAS SOIENT SIGNALÉES AUX ENDROITS VOULUS DANS VOTRE USINE.
PERTURBATIONS DU PROCÉDÉ
L’ENTRETIEN DOIT ÊTRE ASSURÉ PAR UNE PERSONNE QUALIFIÉE EN CONSIDÉRANT L’ASPECT
SÉCURITAIRE DES ÉQUIPEMENTS CONTRÔLÉS PAR CE PRODUIT. L’AJUSTEMENT ET/OU L’EXTRAC-
TION DE CE PRODUIT PEUT OCCASIONNER DES À-COUPS AU PROCÉDÉ CONTRÔLE LORSQU’IL EST
INSÉRÉ DANS UNE SYSTÈME ACTIF. CES À-COUPS PEUVENT ÉGALEMENT OCCASIONNER DES
BLESSURES OU DES DOMMAGES MATÉREILS.
NOTICE
The information contained in this document is subject to change without notice.
Elsag Bailey, its affiliates, employees, and agents, and the authors and contributors to this publication specif-
ically disclaim all liabilities and warranties, express and implied (including warranties of merchantability and
fitness for a particular purpose), for the accuracy, currency, completeness, and/or reliability of the information
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or equipment selected in whole or part with the user of/or in reliance upon information contained herein.
Selection of materials and/or equipment is at the sole risk of the user of this publication.
This document contains proprietary information of Elsag Bailey, Elsag Bailey Process Automation, and
is issued in strict confidence. Its use, or reproduction for use, for the reverse engineering, development
or manufacture of hardware or software described herein is prohibited. No part of this document may be
photocopied or reproduced without the prior written consent of Elsag Bailey.

I-E96-304A
Preface
The Analog Slave Input module (IMASI02) is an interface that
supplies fifteen separate process field signals into the Infi 90
Process Management System. These analog inputs are used by
the Multi-Function Processor Module (MFP) to monitor and
control a process. The slave can also send operating com-
mands it receives from the MFP or the Smart Transmitter Ter-
minal (STT) to Bailey Controls smart transmitters.
This instruction explains the slave module features, specifica-
tions and operations. It details the procedures you must follow
to set up and install an ASI module, and explains status indi-
cators that help in system test and diagnosis.
The system engineer or technician using the ASI should read
and understand this instruction before installing and operat-
ing the slave module. In addition, a complete understanding of
the Infi 90 system is beneficial to the user.

I-E96-304A
®
List of Effective Pages
Total number of pages in this instruction is 40, consisting of the following:
Page No. Change Date
Preface Original
List of Effective Pages Original
iii through vii Original
1-1 through 1-6 Original
2-1 through 2-6 Original
3-1 through 3-5 Original
4-1 Original
5-1 through 5-2 Original
6-1 through 6-4 Original
7-1 Original
8-1 Original
9-1 Original
A-1 through A-3 Original
B-1 through B-3 Original
When an update is received, insert the latest changed pages and dispose of the super-
seded pages.
NOTE: On an update page, the changed text or table is indicated by a vertical bar in the outer mar-
gin of the page adjacent to the changed area. A changed figure is indicated by a vertical bar in the
outer margin next to the figure caption. The date the update was prepared will appear beside the
page number.

vi I-E96-304A
Safety Summary
®
GENERAL
WARNINGS Equipment Environment
All components, whether in transportation, operation or storage,
must be in a noncorrosive environment.
Electrical Shock Hazard During Maintenance
Disconnect power or take precautions to ensure that contact with
energized parts is avoided when servicing.
Special Handling
This module uses Electrostatic Sensitive Devices (ESD).
SPECIFIC
WARNINGS Disconnect power before installing dipshunts for slave modules on
the MMU backplane (slave expander bus). Failure to do so could
result in severe or fatal shock. (p. 3-4)

I-E96-304A vii
Sommaire de Sécurité
AVERTISSEMENTS
D’ORDRE
GÉNÉRAL
Environnement de l’équipement
Ne pas soumettre les composants à une atmosphère corrosive lors
du transport, de l’entreposage ou l’utilisation.
Possibilité de chocs électriques durant l’entretien
Débrancher l’alimentation ou prendre les précautions pour éviter
tout contact avec des composants sous tension durant l’entretien.
Precautions de Manutention
Ce module contient des composantes sensibles aux decharges
electro-statiques.
AVERTISSEMENTS
D’ORDRE
SPÉCIFIQUE
Couper l’alimentation avant d’installer les dipshunts sur la plaque
arriere du chassis de montage de modules (MMU). Toute negli-
gence a cet egard constitue un risque de choc pouvant entrainer
des blessures graves, voire moretiles. (p. 3-4)

Table of Contents
Page
I-E96-304A iii
SECTION 1 - INTRODUCTION....................................................................................................1-1
OVERVIEW ..................................................................................................................1-1
NTENDED USER..........................................................................................................1-2
MODULE DESCRIPTION ..............................................................................................1-2
FEATURES...................................................................................................................1-2
INSTRUCTION CONTENT .............................................................................................1-3
HOW TO USE THIS MANUAL .......................................................................................1-4
REFERENCE DOCUMENTS..........................................................................................1-4
NOMENCLATURE ........................................................................................................1-4
SPECIFICATIONS.........................................................................................................1-5
GLOSSARY OF TERMS AND ABBREVIATIONS .............................................................1-6
SECTION 2 - DESCRIPTION AND OPERATION........................................................................2-1
INTRODUCTION...........................................................................................................2-1
FUNCTIONAL OPERATION ...........................................................................................2-1
INPUTS ........................................................................................................................2-1
Input Circuit Description .......................................................................................2-2
Input Circuit Connections......................................................................................2-2
PROCESSOR AND CONTROL LOGIC ............................................................................2-2
A/D CONVERSION.......................................................................................................2-3
SMART TRANSMITTER COMMUNICATION ...................................................................2-3
MFP Communication .............................................................................................2-4
STT Terminal Communication................................................................................2-4
Smart Transmitter Communication........................................................................2-4
Command Buffering During Transmitter Communication Failure ...........................2-4
Data Byte...............................................................................................................2-5
Status Byte............................................................................................................2-5
Security Byte .........................................................................................................2-5
Communication Lockout Byte ................................................................................2-5
LOGIC POWER.............................................................................................................2-6
SLAVE EXPANDER BUS...............................................................................................2-6
UNIVERSAL SLAVE EXPANDER BUS INTERFACE........................................................2-6
SECTION 3 - INSTALLATION.....................................................................................................3-1
INTRODUCTION...........................................................................................................3-1
SPECIAL HANDLING ....................................................................................................3-1
UNPACKING AND INSPECTION ....................................................................................3-1
SETUP/INSTALLATION ................................................................................................3-2
Slave Address Selection Switch (S1) .......................................................................3-2
Termination Unit/Module Configuration ................................................................3-3
Physical Installation...............................................................................................3-3
WIRING CONNECTIONS AND CABLING .......................................................................3-4
Wiring....................................................................................................................3-4
Cable Connections .................................................................................................3-4
FUSING........................................................................................................................3-5
PRE-OPERATING ADJUSTMENTS ................................................................................3-5

iv I-E96-304A
Table of Contents (continued)
Page
®
SECTION 4 - CALIBRATION.......................................................................................................4-1
INTRODUCTION .......................................................................................................... 4-1
ADJUSTING R22.......................................................................................................... 4-1
SECTION 5 - OPERATING PROCEDURES................................................................................5-1
INTRODUCTION .......................................................................................................... 5-1
START-UP.................................................................................................................... 5-1
OPERATION................................................................................................................. 5-1
SECTION 6 - TROUBLESHOOTING...........................................................................................6-1
INTRODUCTION .......................................................................................................... 6-1
ERROR MESSAGES AND CORRECTIVE ACTION ......................................................... 6-1
Status Reports ...................................................................................................... 6-1
Master Module Errors............................................................................................ 6-2
MODULE PIN CONNECTIONS ...................................................................................... 6-3
SECTION 7 - MAINTENANCE.....................................................................................................7-1
INTRODUCTION .......................................................................................................... 7-1
MAINTENANCE SCHEDULE ........................................................................................ 7-1
SECTION 8 - REPAIR/REPLACEMENT PROCEDURES...........................................................8-1
INTRODUCTION .......................................................................................................... 8-1
MODULE REPAIR/REPLACEMENT.............................................................................. 8-1
SECTION 9 - SUPPORT SERVICES...........................................................................................9-1
INTRODUCTION .......................................................................................................... 9-1
REPLACEMENT PARTS AND ORDERING INFORMATION ............................................. 9-1
TRAINING.................................................................................................................... 9-1
TECHNICAL DOCUMENTATION................................................................................... 9-1
APPENDIX A - TERMINATION UNIT (NTAI05) CONFIGURATION.......................................... A-1
INTRODUCTION ..........................................................................................................A-1
CONFIGURING INPUTS ...............................................................................................A-1
APPENDIX B - TERMINATION MODULE (NIAI04) CONFIGURATION.................................... B-1
INTRODUCTION ..........................................................................................................B-1
CONFIGURING INPUTS ...............................................................................................B-1

List of Figures
No. Title Page
I-E96-304A v
1-1. Infi 90 Communication Levels ................................................................................1-1
2-1. IMASI02 Functional Block Diagram .......................................................................2-1
2-2. IMASI02 Analog Input Circuit ................................................................................2-2
2-3. A/D Converter .......................................................................................................2-3
3-1. Address Select Switch (S1) .....................................................................................3-2
3-2. IMASI02 Cable Connections and Termination.........................................................3-5
5-1. IMASI02 Adapter Jack Location .............................................................................5-2
A-1. Input Circuit for NTAI05 ....................................................................................... A-1
A-2. Dipshunts for NTAI05 ........................................................................................... A-2
A-3. Terminal Assignments for NTAI05 ......................................................................... A-3
A-4. Cable Connections for NTAI05............................................................................... A-3
B-1. Input Circuit for NIAI04 ........................................................................................ B-1
B-2. Dipswitch Settings for NIAI04 ............................................................................... B-2
B-3. Terminal Assignments for NIAI04 .......................................................................... B-3
B-4. Cable Connections for NIAI04 ............................................................................... B-3
List of Tables
No. Title Page
3-1. Address Switch Settings (S1)..................................................................................3-3
6-1. ASI Error Code.......................................................................................................6-2
6-2. Smart Transmitter Error Codes ..............................................................................6-2
6-3. P1 Power Pin Connections......................................................................................6-3
6-4. P2 Expander Bus Connections ...............................................................................6-4
6-5. P3 Input Signal Pin Connections ............................................................................6-4
7-1. Maintenance Schedule ...........................................................................................7-1

OVERVIEW
I-E96-304A 1 - 1
SECTION 1 - INTRODUCTION
OVERVIEW
The Analog Slave Input Module (IMASI02) inputs 15 channels
of analog signals to the Multi-Function Processor (IMMFP01/
02) or Network 90 Multi-Function Controllers. It is a dedicated
slave module that connects field equipment and Bailey smart
transmitters to the master modules in the Infi 90/Network 90
System.
The slave also provides a signal path from an Infi 90 operator
interface such as Operator Interface Station (OIS), or Configu-
ration and Tuning Terminal (CTT) to the Bailey Controls smart
transmitters. The OIS or CTT connects to the Bailey Controls
smart transmitters through the MFP and the ASI. See
Figure 1-1 for Infi 90 communication levels.
Figure 1-1. Infi 90 Communication Levels
COMMUNICATION HIGHWAY (INFI-NET OR PLANT LOOP)
CONTROLWAY
MFP
ASI STT02
TU/TM
ANALOG
INPUTS
OTHER MODULES
OTHER SLAVES
SLAVE EXPANDER BUS
COMMUNICATION
MODULES
TP35740A

INTRODUCTION
NTENDED USER
1 - 2 I-E96-304A
®
This manual explains the purpose, operation, maintenance,
handling precautions and installation procedures of the Analog
Slave Input (ASI) module.
NTENDED USER
System engineers and technicians should read this manual
before installing and operating the ASI module. Put the module
into operation only after reading and understanding this
instruction. Refer to the Table of Contents to find the informa-
tion you need. Refer to the HOW TO USE THIS MANUAL entry
in this section to help you get started.
MODULE DESCRIPTION
The ASI is a single printed circuit board that uses one slot in a
Module Mounting Unit (MMU). Two captive screws on the mod-
ule faceplate secure it to the MMU. The slave module has three
card edge connectors for external signals and power: P1, P2
and P3. P1 connects to common and supply voltages. P2 con-
nects the module to the master module through the slave
expander bus.
Connector P3 carries the inputs from the input cable plugged
into the Termination Unit (TU) or Termination Module (TM).
The terminal blocks for field wiring are on the TU/TM. Refer to
Tables 6-3 through 6-5.
The connector on the front of the module is for the STT01 ter-
minal. The STT02 terminal can connect to this plug if you
change the cable. The optional cable to connect the STT02 to
the ASI can be ordered from your local Bailey Sales Office
(order kit number 258445_1). The STT terminal enters com-
mands through the ASI to the smart transmitters in the pro-
cess system.
The single dipswitch on the ASI module sets the address for the
module. Refer to Section 3 for the steps to set the module
address. Be sure to double check the switch setting before put-
ting the module into the MMU.
FEATURES
The design of the ASI module, as with all Infi 90 modules,
allows for flexibility in creating a process management system.
Refer to NOMENCLATURE in this section to see the list of
devices that can be used with the slave module in an Infi 90
system.
The ASI uses baseband communication designed for Bailey
old-style smart BC/EQ/pH transmitters. Baseband allows dig-
ital signals to flow with the analog data. You always have
access to the real time process status.

INTRODUCTION
INSTRUCTION CONTENT
I-E96-304A 1 - 3
The ASI stores process data, control commands and transmit-
ter setup data in memory. It can restore communication with a
transmitter if a failure occurs. After it restores communication,
the ASI checks the transmitter setup before the MFP resumes
process control.
You can send commands to change transmitter operating
parameters and calibration, and to view process data. Connect a
hand-held Smart Transmitter Terminal (STT) to the adapter jack
on the ASI front plate to enter transmitter commands by hand.
The ASI module can be removed or installed without turning off
power to the system.
INSTRUCTION CONTENT
This manual has eleven sections.
Introduction Is an overview of the ASI module: features, description and
specifications.
Description and
Operation Explains the module operation and input circuits.
Installation Describes cautions to observe when handling ASI modules. It
shows the steps to follow to install and connect the module
before you apply power. This section also presents switch and
jumper settings.
Calibration Presents steps to verify if the ASI module is calibrated.
Operating Procedures Explains the front panel connector and start-up of the slave
module.
Troubleshooting Describes how to monitor the transmitter errors from the sta-
tus reports. It explains how to check for MFP and OIS error and
corrective actions to take.
Maintenance Has a schedule for taking care of the slave module. This sched-
ule can be used for all the modules in the MMU.
Repair/Replacement
Procedures Contains the cautions and steps for taking out and replacing
modules from the MMU.
Support Services Provides a list of information to present when you order parts
from your local Bailey Sales Office. It explains other areas of
support that Bailey Controls provides.
Appendix A and
Appendix B Contain data to connect the termination unit/module to the
ASI. Appendix A shows the dipswitch settings, terminal wiring
for the termination unit and the cabling needed for the ASI.
Appendix B shows the jumper settings, terminal wiring for the
termination module and the cabling needed for the ASI.

INTRODUCTION
HOW TO USE THIS MANUAL
1 - 4 I-E96-304A
®
HOW TO USE THIS MANUAL
Read this manual before handling the ASI module. Refer to the
sections in this list as needed for more information.
1. Read Section 1 before you connect the IMASI02.
2. Read and do the steps in Section 3.
3. Read and do the steps in Section 4.
4. Refer to Section 6 for what to do if a problem occurs.
5. Refer to Section 7 for the scheduled steps needed to main-
tain the ASI.
6. Refer to Section 8 for how to replace a module.
7. Use Section 9 for how to order parts. This section also tells
you some services Bailey offers.
REFERENCE DOCUMENTS
NOMENCLATURE
The following modules and equipment can be used with an ASI
module:
Document
Number Description
I-E96-201 Multi-Function Processor (IMMFP01)
I-E96-202 Multi-Function Processor (IMMFP02)
I-E93-911 Termination Unit Manual
I-E96-110 Operator Interface Station
I-E93-916 Engineering Work Station
I-E92-501-2 Configuration and Tuning Terminal
I-E21-28 Smart Transmitter Terminal (STT02)
I-E93-900-20 Function Code Application Manual
Hardware Nomenclature
IMMFP01/02 Multi-Function Processor Module
NIAI04 Termination Module, Analog Inputs
NTAI05 Termination Unit, Analog Inputs
NKTM01, NKTU02 Cable, Termination Module
NKTU01 Cable, Termination Unit
STT02 Smart Transmitter Terminal
BC Bailey Pressure Transmitters
EQ Bailey Temperature Transmitters
pH Bailey pH Transmitters

INTRODUCTION
SPECIFICATIONS
I-E96-304A 1 - 5
SPECIFICATIONS
Logic Power 5 VDC ±5% at 85 mA typical
+ 15 VDC ±5% at 25 mA typical
- 15 VDC ±5% at 20 mA typical
Power Dissipation 1.1 W typical
Operating
Analog Inputs 15 Independently configured channels:
Analog Input Ranges; 4-20 mA, 1-5 VDC,
0-1 VDC, 0-5 VDC, 0-10 VDC, -10 VDC to +10 VDC
Analog Updates A/D Conversions 10 times per second
A/D Resolution 14 Bits with polarity
Analog Accuracy 0.1% for 4-20 mA
1-5 VDC, 0-5 VDC
0-10 VDC and ±10 VDC
0.25% for 0-1 VDC
Common Mode Voltage -12 VDC minimum
+15 VDC maximum
±12 VDC for ±1 VDC input span
±10 VDC for ±5 VDC input span
±5 VDC for ±10 VDC input span
Common Mode Rejection 90 dB minimum at 60 Hz
Normal Mode Rejection 70 dB minimum at 60 Hz
Input Impedance >1 Megohm
Environmental
Electromagnetic/
Radio Frequency
Interference
No values available at this time.
Keep cabinet doors closed. Do not use communication equipment closer
than 2 meters from the cabinet.
Ambient Temperature 0oto 70oC (0oto 158oF)
Relative Humidity 5% to 95% up to 55o C (131oF) (non-condensing)
5% to 45% at 70oC (158oF) (non-condensing)
Atmospheric Pressure Sea level to 3 km (1.86 miles)
Air Quality Noncorrosive
Mounting Occupies a single slot in a standard Infi 90 Module Mounting Unit (MMU).
Certification CSA certified for use as process control equipment in an ordinary (nonhaz-
ardous) location.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

INTRODUCTION
GLOSSARY OF TERMS AND ABBREVIATIONS
1 - 6 I-E96-304A
®
GLOSSARY OF TERMS AND ABBREVIATIONS
Term Definition
A/D Conversion Analog-to-digital conversion.
Configuration A control strategy with function blocks.
Controlway A redundant peer-to-peer communication path for point data transfer between intelli-
gent modules within a process control unit.
Digital A discrete input signal having only ON and OFF states.
Dipshunt Dual in-line package with shorting bars.
Dipswitch A dual in-line package that contains single pole switches.
EWS Engineering Work Station; an integrated hardware and software personal computer
system for configuring and monitoring Infi 90 modules and systems.
Function Code An algorithm that defines specific functions. These functions link together to form the
control strategy.
LED Light Emitting Diode; the module front panel indicator that shows status and error
messages.
LSB Least Significant Bit; the bit of a binary number that carries the least numerical
weight.
Master Module One of a series of controller modules designed to direct field processes through a
slave module. The multi-function processor is an example.
MFP Multi-Function Processor Module; a multiple-loop controller with data acquisition and
information processing capabilities.
MMU Module Mounting Unit; a card cage that provides electrical and communication sup-
port for Infi 90 modules.
MSB Most Significant Bit; the bit of a binary number that carries the most numerical
weight.
OIS Operator Interface Station; integrated operator console with data acquisition and
reporting capabilities. It provides a window into the process for flexible control and
monitoring.
PCU Process Control Unit; rack type industrial cabinet that contains master, slave and
communication modules, and their communication paths.
Pressure Manifold (Automatic remote) Manifold through which pressure transmitters receive differential
pressure inputs. Receives signals from smart transmitters to set manifold to operate
position, or to provide a zero differential pressure input for transmitter zero output
calibration.
Slave Expander
Bus A parallel address/data bus between the master module and the slave.
Smart Transmitter A field measuring device that can handle digital communication. It allows configuring
of operating parameters, on-line parameter changes, and remote troubleshooting.
TM Termination Module: Provides input/output connection between plant equipment and
the Infi 90 process modules. The termination module slides into a slot in the termina-
tion mounting unit.
TU Termination Unit: Provides input/output connection between plant equipment and the
Infi 90 process modules. The termination unit is a flat circuit board for panel
mounting.

INTRODUCTION
I-E96-304A 2 - 1
SECTION 2 - DESCRIPTION AND OPERATION
INTRODUCTION
This section explains the inputs, control logic, communication
and connections for the Analog Slave Input (ASI) module. The
analog slave performs three major tasks.
•Interfacing analog inputs to the Multi-Function Processor
(MFP).
•Interfacing communication between the Infi 90 control sys-
tem and Bailey Controls smart transmitters.
•Providing an interface for hand-held terminal communica-
tions with Bailey Controls smart transmitters.
FUNCTIONAL OPERATION
Figure 2-1 shows a block diagram of the IMASI02 input mod-
ule. Refer to this figure when you read the module description.
Note that the digital smart transmitter command signal rides
on the analog input signal.
INPUTS
The analog input signal enters the P3 card edge connector on
the ASI module. The analog input filters separate the analog
signal from the digital 100 millivolt signal. The analog input
multiplexers select the sequence to convert the analog input
signals to digital signals. The signals are changed from up to
±10 VDC to logic levels in the A/D converter.
Figure 2-1. IMASI02 Functional Block Diagram
MODULE
POWER
STT
CONNECTOR
SLAVE
EXPANDER
BUS
(TO MFP)
SMART
TRANSMITTERS/
ANALOG INPUTS
P1
P3
P2
TP35741A
SMART
TRANSMITTER
MULTIPLEXERS
SMART
TRANSMITTER
AMPLIFIERS
ANALOG INPUT
FILTERS
ANALOG INPUT
MULTIPLEXERS
A/D
CONVERTER
MICRO-
PROCESSOR EXPANDER
BUS
INTERFACE

DESCRIPTION AND OPERATION
PROCESSOR AND CONTROL LOGIC
2 - 2 I-E96-304A
®
The ASI interfaces 15 channels of analog inputs from field
equipment and smart transmitters to the MFP. Inputs from the
field connect to Termination Module NIAI04 or Termination
Unit NTAI05. The termination devices connect through cables
to the ASI. The ASI accepts analog inputs from any device with
current or voltage outputs. Input voltages may be: 4 to 20 mA,
0 to 1 VDC, 0 to 5 VDC, 0 to 10 VDC, 1 to 5 VDC, or -10 VDC to
+10 VDC.
The ASI constantly does A/D conversions on each input chan-
nel at 10 times per second. The ASI memory stores all con-
verted digital values until it sends them to the MFP.
Upon system start-up, the MFP does not accept inputs from a
smart transmitter channel until the transmitter receives its
complete configuration from the ASI.
Input Circuit Description
Input signals go through two low band pass filters to the A/D
converter. Figure 2-2 shows a typical analog input circuit.
Input Circuit Connections
Analog input signals from a termination unit or module con-
nect to the P3, 30-pin, card edge connector through a cable.
PROCESSOR AND CONTROL LOGIC
The on board microprocessor on the ASI coordinates module
functions. The microprocessor has four main functions:
•Storing the digital data in RAM memory.
•Coordinating A/D conversion.
•Preparing the digital commands to send to the smart trans-
mitters.
•Reading and sending data to the MFP.
Figure 2-2. IMASI02 Analog Input Circuit
TP35739A
ANALOG INPUT
FROM THE FIELD MULTIPLEX CIRCUIT TO A/D CONVERTER
–
+

DESCRIPTION AND OPERATION
A/D CONVERSION
I-E96-304A 2 - 3
The microprocessor sends command signals to the smart
transmitters through the smart transmitter amplifier and
smart transmitter multiplexers. The smart transmitter ampli-
fier converts the logic level commands to 100 millivolt com-
mands. The smart transmitter multiplexers select the channel
(and the analog signal) that the command rides on.
The MFP communicates with the ASI over the slave expander
bus. The slave expander bus interface circuit interfaces the
microprocessor to the slave expander bus. Function code (FC)
132 or 133 allows the master module to read point (input) data
or status data from the ASI automatically. This data is output
by the ASI buffer circuits in the control logic to the slave
expander bus interface. The slave address in FC 132 or FC 133
must be the same as the address set on the slave address
dipswitch S1.
A/D CONVERSION
A dual slope analog to digital converter does the A/D conver-
sion. It has 14 bit resolution and polarity detection. The A/D
chip contains the logic to control the converter. The ASI con-
verts each channel about every 100 milliseconds. The ASI
stores the converted data in memory. When the MFP requests
the data for the channel, the ASI sends the converted data. The
ASI also sends two transmitter status bytes for each channel,
see Figure 2-3.
SMART TRANSMITTER COMMUNICATION
The digital interface through the ASI and the MFP provides a
communication path between an Infi 90 operator interface and
the Bailey Controls smart transmitters (Figure 1-1). The opera-
tor can send commands from an operator interface to change
Figure 2-3. A/D Converter
ANALOG INPUTS
MUX
OPERATION
SELECT
DUAL SLOPE
INTEGRATOR/
DE-INTEGRATOR
AND
ZERO-CROSSING
DETECTOR
TP50181A
REFERENCES
INPUTS
A/D CONTROL
CHIP 9008

DESCRIPTION AND OPERATION
SMART TRANSMITTER COMMUNICATION
2 - 4 I-E96-304A
®
transmitter parameters such as range, or to calibrate transmit-
ter output. Transmitters also send process and status data
through the ASI for the Infi 90 system to monitor. Access this
status data from the status reports. Refer to Section 6 for more
detail on using the status reports.
MFP Communication
The MFP communicates with the ASI over the slave expander
bus in parallel digital format. The ASI slave bus interface con-
verts this parallel format to serial digital format and sends it to
the transmitters over the current loop.
STT Terminal Communication
An adapter jack on the front plate of the ASI allows the connec-
tion of a portable Smart Transmitter Terminal (STT). The STT
monitors outputs of a field device connected to the ASI. It han-
dles these transmitter commands: select the channel, change
the ID tag, report the input or output, report the status, get the
configuration data.
Smart Transmitter Communication
System start-up downloads the smart transmitter configura-
tions and operating ranges from the MFP through the ASI. The
MFP sends commands to the transmitters to change parame-
ters. Command functions include: calculating range, doing
output calibration, and operating an automatic remote mani-
fold.
Command Buffering During Transmitter Communication Failure
If any command fails to get to a transmitter, the ASI halts com-
munication with that transmitter. The ASI already has the
transmitter setup data stored in memory. The ASI now stores
the set of transmitter commands an operator enters during the
communication failure. The ASI can store two commands, one
from each column in the list.
The ASI tries to restart communication with a failed smart
transmitter once each minute. When communication over a
failed channel resumes, the ASI downloads the setup data and
stored commands to that transmitter.
AUTOZERO MANIFOLD RUN
OUTPUT ZERO MANIFOLD ZERO
OUTPUT SPAN
FIX OUTPUT
CANCEL

DESCRIPTION AND OPERATION
SMART TRANSMITTER COMMUNICATION
I-E96-304A 2 - 5
The operator can enter one command from each column
through the MFP during a failure. The ASI stores only the last
command entered of each set. The transmitter receives this
last command when the parameters download from the ASI.
Data Byte
The point data is two 8-bit bytes, each bit of data represents
one input. The bit value reflects the state of that input, either
open (logic 1) or closed (logic 0).
Status Byte
The status byte makes sure the slave expander bus data and
the master module setup data are correct. The ASI sends a sta-
tus byte to ensure correct data transfer. The status byte com-
pares the sum of the bytes sent to the sum of the bytes
received. The master module reads the status byte and com-
pares it to an expected value. If a mismatch occurs, it flags the
error and marks the point as bad quality.
Security Byte
When a smart transmitter is operating with the ASI in a control
system, transmitter operating parameters should not be
changed except through the ASI. To prevent changes, the ASI
sends a security byte at the beginning of each communication.
The security byte triggers the smart transmitters to take com-
mands only from the ASI. The security byte locks out com-
mands, such as reranging, from any other interface device.
These devices (smart transmitter terminals) connect to the
transmitter current loop.
Communication Lockout Byte
In normal operation, the ASI sends the lockout byte once each
minute to the smart transmitters when the ASI checks trans-
mitter status. If the ASI does not send a byte within a two
minute period, the transmitter unlocks itself, and accepts com-
mands from other sources on the current loop. You can unlock
transmitters to allow communication from other sources. To do
this, set specification 1 in Function Code 133, smart transmit-
ter definition. This lockout feature prevents unwanted trans-
mitter configuration changes. To enter changes, connect a STT
terminal to the plug in the front of the ASI module. Changes
also can be entered through another interface device connected
to the transmitter current loop while the system is operating.