Bailey Infi 90 IMDSO01 User manual

®
®
Process Control and
Automation Solutions
from Elsag Bailey Group
E96-310
Digital Output Module
(IMDSO01/02/03)

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 Bailey Controls 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 Bailey Controls TOUTE NÉGLIGENCE À
CET ÉGARD POURRAIT ÊTRE UNE CAUSE D’ACCIDENT OU DE DÉFAILLANCE DU MATÉRIEL.
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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.
Bailey Controls Company, its affiliates, employees, and agents, and the authors and contributors to this pub-
lication specifically disclaim all liabilities and warranties, express and implied (including warranties of mer-
chantability and fitness for a particular purpose), for the accuracy, currency, completeness, and/or reliability
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any material and/or equipment selected in whole or part with the user of/or in reliance upon information con-
tained herein. Selection of materials and/or equipment is at the sole risk of the user of this publication.
This document contains proprietary information of Bailey Controls Company, Elsag Bailey Process Auto-
mation, 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 doc-
ument may be photocopied or reproduced without the prior written consent of Bailey Controls Company.

I-E96-310B
Preface
The IMDSO01, IMDSO02 and IMDSO03 Digital Output Mod-
ules (DSO) output eight separate digital signals from the
INFI 90®Process Management System to a process. Control
modules use these outputs to control (switch) process field
devices.
This instruction explains the DSO module features, specifica-
tions and operation. It also includes installation and trouble-
shooting procedures for each module.
The system engineer or technician using the modules should
read and understand this instruction before installing any
modules. In addition, a complete understanding of the system
is beneficial.
There are four types of DSO modules. This instruction dis-
cusses the IMDSO01, IMDSO02 and IMDSO03 modules. Refer
to the appropriate instruction for information about the
IMDSO04 Digital Output Module.
® INFI 90 is a registered trademark of Elsag Bailey Process Automation.

I-E96-310B
®
List of Effective Pages
Total number of pages in this manual is 42, 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 3-4 Original
4-1 through 4-2 Original
5-1 through 5-3 Original
6-1 through 6-4 Original
7-1 through 7-2 Original
8-1 through 8-2 Original
A-1 through A-3 Original
B-1 through B-2 Original
Index-1 Original
When an update is received, insert the latest changed pages and dispose of the super-
seded pages.
NOTE: On an updated page, the changed text or table is indicated by a vertical bar in the outer mar-
gin of the page at the changed area. A changed figure is indicated by a vertical bar in the outer mar-
gin next to the figure caption. The date the update was prepared will appear beside the page
number.

Table of Contents
Page
I-E96-310B iii
SECTION 1 - INTRODUCTION....................................................................................................1-1
OVERVIEW ..................................................................................................................1-1
INTENDED USER .........................................................................................................1-2
MODULE DESCRIPTION ..............................................................................................1-2
FEATURES...................................................................................................................1-2
INSTRUCTION CONTENT .............................................................................................1-3
HOW TO USE THIS INSTRUCTION ...............................................................................1-3
GLOSSARY OF TERMS AND ABBREVIATIONS .............................................................1-4
REFERENCE DOCUMENTS..........................................................................................1-4
NOMENCLATURE ........................................................................................................1-4
SPECIFICATIONS.........................................................................................................1-5
SECTION 2 - DESCRIPTION AND OPERATION........................................................................2-1
INTRODUCTION...........................................................................................................2-1
DIGITAL OUTPUTS.......................................................................................................2-1
FUNCTIONAL BLOCK DIAGRAM ..................................................................................2-1
Digital Output Circuits...........................................................................................2-1
Output Control Logic .............................................................................................2-3
Status Logic...........................................................................................................2-3
OUTPUT CIRCUIT CONNECTIONS................................................................................2-4
I/O EXPANDER BUS ....................................................................................................2-4
UNIVERSAL I/O EXPANDER BUS INTERFACE .............................................................2-4
MODULE DATA............................................................................................................2-5
Status Data ...........................................................................................................2-5
Output Data ..........................................................................................................2-5
Default Data ..........................................................................................................2-5
LOGIC POWER.............................................................................................................2-5
BUS FAULT TIMER ......................................................................................................2-6
STATUS LED INDICATOR.............................................................................................2-6
SECTION 3 - INSTALLATION.....................................................................................................3-1
INTRODUCTION...........................................................................................................3-1
SPECIAL HANDLING ....................................................................................................3-1
UNPACKING AND INSPECTION ....................................................................................3-2
TERMINATION DEVICE CONFIGURATION AND INSTALLATION....................................3-2
SETUP AND PHYSICAL INSTALLATION ........................................................................3-2
Dipswitch S1 Settings ............................................................................................3-3
Fuses.....................................................................................................................3-3
Physical Installation...............................................................................................3-4
SECTION 4 - OPERATING PROCEDURES................................................................................4-1
INTRODUCTION...........................................................................................................4-1
LED INDICATORS ........................................................................................................4-1
Module Status LED ................................................................................................4-2
Output Status LEDs ..............................................................................................4-2
Fuse Status LED....................................................................................................4-2
START-UP PROCEDURES ............................................................................................4-2
SECTION 5 - TROUBLESHOOTING...........................................................................................5-1
INTRODUCTION...........................................................................................................5-1
ERROR INDICATIONS ..................................................................................................5-1

iv I-E96-310B
Table of Contents (continued)
Page
®
SECTION 5 - TROUBLESHOOTING
(continued)
Module Status LED ............................................................................................... 5-1
Fuse Status LED ................................................................................................... 5-2
CONTROL MODULE ERRORS ...................................................................................... 5-2
EDGE CONNECTORS .................................................................................................. 5-2
SECTION 6 - MAINTENANCE.....................................................................................................6-1
INTRODUCTION .......................................................................................................... 6-1
PREVENTIVE MAINTENANCE SCHEDULE ................................................................... 6-1
EQUIPMENT AND TOOLS REQUIRED.......................................................................... 6-2
PREVENTIVE MAINTENANCE PROCEDURES .............................................................. 6-2
Printed Circuit Board Cleaning .............................................................................. 6-2
General Cleaning and Washing........................................................................ 6-3
Edge Connector Cleaning ................................................................................ 6-3
Checking Connections ........................................................................................... 6-4
SECTION 7 - REPAIR/REPLACEMENT PROCEDURES...........................................................7-1
INTRODUCTION .......................................................................................................... 7-1
MODULE REPLACEMENT PROCEDURE ...................................................................... 7-1
FUSE REPLACEMENT PROCEDURE............................................................................ 7-2
TERMINATION UNIT OR MODULE REPLACEMENT PROCEDURE ................................ 7-2
SECTION 8 - SUPPORT SERVICES...........................................................................................8-1
INTRODUCTION .......................................................................................................... 8-1
REPLACEMENT PARTS AND ORDERING INFORMATION.............................................. 8-1
TRAINING.................................................................................................................... 8-2
TECHNICAL DOCUMENTATION................................................................................... 8-2
APPENDIX A - NTDI01 TERMINATION UNIT CONFIGURATION ............................................A-1
INTRODUCTION ..........................................................................................................A-1
APPENDIX B - NIDI01 TERMINATION MODULE CONFIGURATION ......................................B-1
INTRODUCTION ..........................................................................................................B-1

List of Figures
No. Title Page
I-E96-310B v
1-1. IMDSO01, IMDSO02 and IMDSO03 Applications....................................................1-1
2-1. Digital Output Module Block Diagram ....................................................................2-2
2-2. Digital Output Circuit ............................................................................................2-2
3-1. DSO Dipswitch and Fuse Locations ........................................................................3-2
4-1. DSO Faceplate LEDs ..............................................................................................4-1
A-1. NTDI01 Component Locations............................................................................... A-1
A-2. NTDI01 Terminal Block Assignments .................................................................... A-2
A-3. NTDI01 Unit to IMDSO01, IMDSO02 and IMDSO03 Module Connections .............. A-3
B-1. NIDI01 Component Locations................................................................................ B-1
B-2. NIDI01 Terminal Block Assignments ..................................................................... B-2
B-3. NIDI01 Module to IMDSO01, IMDSO02 and IMDSO03 Module Connections .......... B-2
List of Tables
No. Title Page
1-1. Glossary of Terms and Abbreviations......................................................................1-4
1-2. Reference Documents ............................................................................................1-4
1-3. Nomenclature ........................................................................................................1-4
1-4. Specifications.........................................................................................................1-5
3-1. DSO Dipswitch S1 Settings ....................................................................................3-3
3-2. Fuse Ratings..........................................................................................................3-3
5-1. Module Status LED Error Indications and Corrective Actions ..................................5-1
5-2. Edge Connector P1 Pin Assignments ......................................................................5-3
5-3. Edge Connector P2 Pin Assignments ......................................................................5-3
5-4. Edge Connector P3 Pin Assignments ......................................................................5-3
6-1. Preventive Maintenance Schedule ..........................................................................6-2
8-1. Spare Parts List .....................................................................................................8-1
A-1. NTDI01 Dipshunt Configurations .......................................................................... A-2

vi I-E96-310B
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 insure that contact with
energized parts is avoided when servicing.
Special Handling
This module uses electrostatic sensitive devices.
SPECIFIC
WARNINGS Disconnect power before installing dipshunts on the module mount-
ing unit backplane. Failure to do so will result in contact with cabinet
areas that could cause severe or fatal shock. (p. 3-4)
Wear eye protection whenever working with cleaning solvents.
When removing solvents from printed circuit boards using com-
pressed air, injury to the eyes could result from splashing solvent as
it is removed from the printed circuit board. (p. 6-1)
If input or output circuits are a shock hazard after disconnecting sys-
tem power at the power entry panel, then the door of the cabinet
containing these externally powered circuits must be marked with a
warning stating that multiple power sources exist. (p. 7-1)
SPECIFIC
CAUTIONS Disable the module output signals before removing the module.
Damage to the module may result. (p. 5-1, 7-1)

I-E96-310B 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
Interrompez l'alimentation avant d'installer des dipshunts sur le fond
de panier du châssis de montage des modules. Sinon, tout contact
avec cette zone entraîne des risques d'électrocution sérieuse ou
fatale. (p. 3-4)
Des lunettes de protection devraient être portées lors de travail avec
des solvants nettoyants. Lorsqu’on enlève les solvants des circuits
imprimés à l’aide d’air comprimé, les éclaboussures de solvant
pourraient causer des blessures aux yeux. (p. 6-1)
Si des circuits d'entrée ou de sortie sont alimentés à partir de
sources externes, ils présentent un risque de choc électrique même
lorsque l'alimentation du système est débranchée du panneau
d'entrée d'alimentation. Le cas échéant, un avertissement signalant
la présence de sources d'alimentation multiples doit être apposé sur
la porte de l'armoire. (p. 7-1)
ATTENTIONS
D’ORDRE
SPÉCIFIQUE
Il est nécessaire de désactiver les signaux de sortie du module
avant de le retirer de sa position. Un manquement à cette précau-
tion pourrait endommager le module. (p. 5-1, 7-1)

OVERVIEW
I-E96-310B 1 - 1
SECTION 1 - INTRODUCTION
OVERVIEW
The IMDSO01, IMDSO02 and IMDSO03 Digital Output (DSO)
Modules output eight isolated digital signals from the INFI 90
system to control a process. The signals provide digital switch-
ing (on or off) for process field devices. Control modules per-
form the control functions and I/O modules provide the input
and output signals. Figure 1-1 illustrates the position of the
DSO module within the INFI 90 architecture.
The DSO modules all function and operate the same. The only
difference is in the output switching capability and associated
fusing.
Figure 1-1. IMDSO01, IMDSO02 and IMDSO03 Applications
OTHER I/O MODULES
OTHER MODULES
CONTROLWAY OR MODULE BUS
I/O EXPANDER BUS
MFP
TU
TM
TP27127B
DSO
DIGITAL OUTPUTS
COMMUNICATION MODULES
COMMUNICATION HIGHWAY (INFI-NET OR PLANT LOOP)

INTRODUCTION
INTENDED USER
1 - 2 I-E96-310B
®
INTENDED USER
Personnel installing, operating or maintaining the DSO module
should read this instruction before performing any installa-
tion, operation or maintenance procedures. Installation
requires an engineer or technician with experience handling
electronic circuitry and who is familiar with live I/O circuits.
MODULE DESCRIPTION
The DSO module is an I/O module that outputs eight separate
digital signals through solid state relays mounted on the cir-
cuit board. These outputs can be used to control devices that
in turn control the process.
The DSO module is a single printed circuit board that occupies
one slot in the module mounting unit. The circuit board con-
tains circuitry, fuses and solid state relays that enable it to
control field devices that control the process.
Two captive latching screws on the faceplate secure the DSO
module to the module mounting unit. There are ten LEDs on
the faceplate that display module status, fuse status and the
status of each output.
The DSO module has three card edge connectors for external
signals and power (P1, P2 and P3). Connector P1 connects to
the common and +5 VDC power. Connector P2 connects the
DSO module to the I/O expander bus. Connector P3 passes the
digital output signals through a cable that is connected to a
termination device. The output signals are wired from the ter-
mination device to the controlled field device.
FEATURES
The DSO module has the following features:
•The DSO module provides eight separate digital output sig-
nals.
•The three DSO modules allow for the switching of three
voltage ranges of signals. The IMDSO01 module switches
voltages of 24 to 240 VAC. The IMDSO02 module switches
voltages of four to 60 VDC. The IMDSO03 module switches
voltages of five to 160 VDC.
•Front panel LEDs provide a visual indication of the module
status to aid in system testing and troubleshooting.
•User-defined default states.

INTRODUCTION
INSTRUCTION CONTENT
I-E96-310B 1 - 3
INSTRUCTION CONTENT
This instruction consists of eight sections and two appendices.
Introduction Provides an overview of the DSO modules. It contains a module
description, features and specifications.
Description and
Operation Explains module operation.
Installation Covers handling guidelines and explains how to configure the
modules before placing them into operation.
Operating Procedures Provides information about normal module operation.
Troubleshooting Explains how to troubleshoot the modules using error codes
and lists the corrective action.
Maintenance Contains a maintenance schedule for the modules.
Repair/Replacement
Procedures Explains how to replace the modules.
Support Services Explains the customer training Bailey Controls Company pro-
vides and information about ordering replacement parts.
Appendices Provide information on termination unit and module configu-
ration.
HOW TO USE THIS INSTRUCTION
Read this instruction in sequence. It is important to become
familiar with the entire contents of this instruction before
using the modules. This instruction is organized to enable
quick information retrieval.
1. Perform all steps in the installation section.
2. Thoroughly read the operating procedures section before
applying power to the process control unit interfaces.
3. Refer to the troubleshooting section if a problem occurs.
This section will help to diagnose and correct a problem.
4. Refer to the maintenance section for scheduled mainte-
nance requirements.
5. Go to the repair/replacement procedures section to find
instructions on how to replace a module.
6. Refer to the support services section for a list of replace-
ment parts and warranty information.

INTRODUCTION
GLOSSARY OF TERMS AND ABBREVIATIONS
1 - 4 I-E96-310B
®
GLOSSARY OF TERMS AND ABBREVIATIONS
Table 1-1 lists the terms and abbreviations used in this man-
ual that are unique to Bailey Controls Company.
REFERENCE DOCUMENTS
Table 1-2 lists the documents that provide additional informa-
tion for related hardware and software. Refer to them as
needed.
NOMENCLATURE
Table 1-3 lists equipment associated with the DSO modules.
® Network 90 is a registered trademark of Elsag Bailey Process Automation.
Table 1-1. Glossary of Terms and Abbreviations
Term Definition
I/O Expander Bus Parallel communication bus between the controller and I/O modules.
Process Control Unit A node on the plant wide communication network containing control and I/O mod-
ules.
Termination Module Provides input/output connection between plant equipment and the INFI 90/
Network 90®modules.
Termination Unit Provides input/output connection between plant equipment and the INFI 90/
Network 90 modules.
Table 1-2. Reference Documents
Document
Number Title
I-E96-200 Function Code Application Manual
I-E96-201 IMMFP01 Multi-Function Processor Module
I-E96-202 IMMFP02 Multi-Function Processor Module
I-E96-203 IMMFP03 Multi-Function Processor Module
I-E96-209 IMLMM02 Logic Master Module
I-E96-313 IMDSO04 Digital Output Module
I-E96-410 NIDI01 Digital Input Termination Module
I-E96-424 NTDI01 Digital I/O Termination Unit
Table 1-3. Nomenclature
Nomenclature Description
IEMMU01/02/04 Module mounting unit
IMLMM02 Logic master module
IMMFP01/02/03 Multi-function processor module
NFTP01 Field termination panel

INTRODUCTION
SPECIFICATIONS
I-E96-310B 1 - 5
SPECIFICATIONS
Refer to Table 1-4 for the specifications of the DSO modules.
NIDI01 Digital input termination module
NKTU01 Termination cable, IMDSO01/02/03 to NTDI01 (PVC)
NKTU02 Termination cable, IMDSO01/02/03 to NIDI01 (PVC)
NKTU11 Termination cable, IMDSO01/02/03 to NTDI01 (non-PVC)
NKTU12 Termination cable, IMDSO01/02/03 to NIDI01 (non-PVC)
NTDI01 Digital I/O termination unit
NTMU01/02 Termination mounting unit
Table 1-3. Nomenclature (continued)
Nomenclature Description
Table 1-4. Specifications
Property Characteristic/Value
IMDSO01
Power requirements +5.00, ±0.25 VDC at 150 mA; 0.75 W nominal
Max. load voltage 24 VAC to 240 VAC
Max. load current 3.0 A at 25°C (77°F)
2.0 A at 50°C (122°F)
1.0 A at 70°C (158°F)
Max. off leakage current 8.5 mA at 120 VAC, 25°C (77°F)
17.5 mA at 240 VAC, 25°C (77°F)
Max. on voltage drop 3.0 V at 3.0 A, 25°C (77°F) with 0.3-m (1-ft) long termination device cable
Max. surge current 50 A for 1 cycle
IMDSO02
Power requirements +5.00, ±0.25 VDC at 150 mA; 0.75 W nominal
Max. load voltage 4 VDC to 60 VDC1
Max. load current 3.0 A at 25°C (77°F)
2.5 A at 50°C (122°F)
1.5 A at 70°C (158°F)
Max. off leakage current 1.0 mA at 70°C (158°F)
Max. on voltage drop 2.9 V at 3.0 A, 25°C (77°F) with 0.3-m (1-ft) long termination device cable
Max. surge current 5 A for 1 second
IMDSO03
Power requirements +5.00, ±0.25 VDC at 150 mA; 0.75 W nominal
Max. load voltage 5 VDC to 160 VDC2
Max. load current 1.0 A at 25°C (77°F)
0.9 A at 50°C (122°F)
0.5 A at 70°C (158°F)
Max. off leakage current 2.0 mA at 70°C (158°F)

INTRODUCTION
SPECIFICATIONS
1 - 6 I-E96-310B
®
IMDSO03
(continued)
Max. on voltage drop 2.1 V at 1.0 A, 25°C (77°F) with 0.3-m (1-ft) long termination device cable
Max. surge current 2 A for 1 second
All IMDSO01/02/03
Isolation 300 VRMS between output and logic circuitry and between outputs. CSA
approved for 300 V isolation.
Mounting Occupies one slot in standard INFI 90 module mounting unit.
Electromagnetic/radio
frequency interference Values not available at this time. Keep cabinet doors closed. Do not use com- munication equipment any closer than 2 meters from the cabinet.
Ambient temperature 0° to 70°C (32° to 158°F)
Relative humidity 5% to 90% up to 55°C (131°F) (noncondensing)
5% to 40% above 55°C (131°F) (noncondensing)
Atmospheric pressure Sea level to 3 km (1.86 mi.)
Air quality Noncorrosive
Installation category Category III
Certification CSA certified for use as process control equipment in an ordinary (nonhaz-
ardous) environment
Factory Mutual approved for use in Class I, Division 2, hazardous locations.
NOTES:
1. The open fuse detection circuitry may not function for load voltages below 10 VDC.
2. The open fuse detection circuitry may not function for load voltages below 24 VDC.
Table 1-4. Specifications (continued)
Property Characteristic/Value

INTRODUCTION
I-E96-310B 2 - 1
SECTION 2 - DESCRIPTION AND OPERATION
INTRODUCTION
This section explains the digital output circuitry, control logic,
data, logic power, and connections for the IMDSO01, IMDSO02
and IMDSO03 Digital Output Module (DSO). The DSO module
is a digital signal interface between a control module
(multi-function processor module, multi-function controller
module, or logic master module) and process field devices. The
control module communicates with its DSO module on the I/O
expander bus as shown in Figure 1-1. Each DSO module on
the I/O expander bus has a unique I/O expander bus address.
The address of a DSO module is set by dipswitch S1.
DIGITAL OUTPUTS
Digital signals have two states, on or off. The DSO digital out-
puts switch voltages of 24 to 240 VAC (IMDSO01 module), four
to 60 VDC (IMDSO02 module) or five to 160 VDC (IMDSO03
module). These voltages energize (turn on) or de-energize (turn
off) field devices. The type of process field devices determines
which DSO module to use.
FUNCTIONAL BLOCK DIAGRAM
The DSO module consists of registers, buffers and interface
circuits. They control the digital output switching and transmit
operating status to a control module. Solid state relays provide
the switching functions. Figure 2-1 is a block diagram of the
DSO module. It illustrates signal flow through the module.
Digital Output Circuits
The digital output block consists of eight solid state relays that
function as digital output switches. The digital output block
also includes fuses that protect the module circuitry and field
devices from current surges and short circuits. Each of the
three DSO module variants have different output switching
capabilities and fusing. The solid state relays on a DSO module
determine the voltage switching capability of that module. All
the relays are normally open or de-energized until a signal
from the data selector block causes the relay circuit to close or
energize. Figure 2-2 shows the digital output circuit.
The data selector block drives the solid state relays. It uses
data from the output register or default register to open or

DESCRIPTION AND OPERATION
FUNCTIONAL BLOCK DIAGRAM
2 - 2 I-E96-310B
®
close them. The relays follow the output of the registers. Dur-
ing normal operation, the DSO module selects the output reg-
ister data. Its outputs also turn the front panel output status
LEDs on or off. A logic one is inverted by the output block cir-
cuits to energize a relay and light an LED. A logic zero de-ener-
gizes a relay and turns an LED off.
Figure 2-1. Digital Output Module Block Diagram
Figure 2-2. Digital Output Circuit
TP21193A
I/O EXPANDER BUS
I/O EXPANDER BUS
INTERFACE
ADDRESS
DIPSWITCH
I/O EXPANDER BUS
FAULT DETECTOR
MODULE
STATUS
MODULE
STATUS LED
OUTPUT
REGISTER
DEFAULT
REGISTER
STATUS
BUFFER
DATA
SELECTOR
DEFAULT
CONTROL LOGIC
DIGITAL
OUTPUT
DIGITAL
OUTPUT
STATUS LEDs
FUSE STATUS
DETECTOR
FUSE
STATUS
LED
DIGITAL OUTPUTS
+
-
+
-
+5 V
+5 V
+5 V
FROM OUTPUT
CIRCUITRY
+5 V
+
-
+5 V
+5 V
FIELD
OUTPUT
+
-
TO FUSE BLOWN
INDICATOR
CIRCUITRY
TP27122A
SOLID
STATE
RELAY

DESCRIPTION AND OPERATION
FUNCTIONAL BLOCK DIAGRAM
I-E96-310B 2 - 3
Output Control Logic
An output register holds the output data that is sent to the
solid state relays. The I/O expander bus interface writes con-
trol module data to this register. This data, sent to the data
selector block, sets the relay states for normal operation.
Default data from the control module is sent to the default reg-
ister. The control module configuration sets the default values
(function code 128). The default register is reset to logic zeros
during power up to drive the output relays to a de-energized
state. Function code 128 in the control module configuration
selects the output values used to drive the output circuits in
the event of a control module failure (time-out condition). If
function code 128 is not defined, the outputs will go to a
de-energized state during a time-out condition. Refer to BUS
FAULT TIMER for further explanation of a time-out condition.
The default control logic block is a one-bit latch register. It
sends a signal to the data selector block to select either the
default register data or the output register data during a
time-out condition (indicating a control module error). This sig-
nal is dependent on the control module configuration (function
code 83, specification S2). The bus fault detector in the I/O
expander bus interface checks for a time-out condition. During
a time-out condition, the data selector block normally selects
the default register data. If a hold option is selected in function
code 83, the control logic block sends a logic one to override
the data selector. It causes the data selector to drive the relays
with output register data instead of default data to maintain
the outputs at their current values.
Status Logic
Optocouplers in the fuse status detector block isolate the digi-
tal outputs from the I/O module circuits. The fuse status
detector block also has circuits that test the individual fuse
conditions to indicate a blown (open) or good fuse. This block
sends the individual fuse state signals to a status buffer and
an OR gate. Blown fuses cause the OR gate to output a signal
that lights the front panel blown fuse LED indicator. It also sets
a bit in a status buffer to indicate to the control module that
the fuse LED is lit.
When field and power wiring are connected to the appropriate
termination unit or module, the blown fuse detection circuitry
is enabled in IMDSO01 modules. For IMDSO02 and IMDSO03
modules, the blown fuse detection circuitry for each output is
operational only when the solid state relay of the output is
energized. The energized relay provides a current path for the
isolated I/O supply voltage that drives the blown fuse detection
circuits. When a fuse blows, it is detected by the circuits and
latched. This latched output lights the front panel fuse status

DESCRIPTION AND OPERATION
OUTPUT CIRCUIT CONNECTIONS
2 - 4 I-E96-310B
®
LED and is input to the module status buffer. A module reset
(remove and insert) clears the latch. Removing the module to
replace the fuse resets the fuse status.
The status buffer block provides module status information to
the control module. This information is output states, fuse sta-
tus, and module identification and status. The control module
reads this data through the I/O expander bus interface. Refer
to MODULE DATA for an explanation of the data.
OUTPUT CIRCUIT CONNECTIONS
The output signals connect to edge connector P3 of the DSO
module using a cable from a termination device. The IMDSO02
and IMDSO03 modules require that proper polarity be
observed when wiring DC field signals. Polarity of AC signals
does not affect switching (IMDSO01 module).
I/O EXPANDER BUS
The INFI 90 I/O expander bus is a high speed synchronous
parallel bus. It provides a communication path between control
modules and I/O modules. The control module provides the
control functions and the I/O module provides the I/O func-
tions. The P2 edge connector of the I/O and control modules
connects to the bus.
The I/O expander bus is 12 parallel signal lines located on the
module mounting unit backplane. A 12-position dipshunt
placed in a connection socket on the module mounting unit
backplane connects the bus between the control and I/O mod-
ules. Cable assemblies can extend the bus to additional mod-
ule mounting units within a cabinet.
A control module and its I/O modules form an individual sub-
system within a process control unit. The I/O expander bus
between subsystems must be separated. Leaving a dipshunt
socket empty or not connecting the module mounting units
with cables separates the subsystems.
UNIVERSAL I/O EXPANDER BUS INTERFACE
The DSO module uses a custom gate array to perform the I/O
expander bus interface function. All the control logic and com-
munication protocol are built into an integrated circuit. This
integrated circuit provides the following functions:
• Address comparison and detection.
• Function code latching and decoding.
• Read strobe generation.
• Data line filtering of bus signals.
• On-board bus drivers.

DESCRIPTION AND OPERATION
MODULE DATA
I-E96-310B 2 - 5
MODULE DATA
Function code 83 in the control module configuration accesses
the DSO module on the I/O expander bus. It also allows the
control module to automatically read status data from the I/O
module, and write output data to it. The I/O module address in
function code 83 must be the same as the address set on the
I/O expander bus address dipswitch (dipswitch S1).
Status Data
Status data consists of three eight-bit bytes read by the control
module. The first byte contains readback data that reflects the
state of the solid state output relays. Each bit of this data cor-
responds to the digital output state (on or off). The second byte
is the fuse status; each bit reflects the condition of a fuse (logic
one = blown fuse, logic zero = good fuse). The third byte is the
module identification and module status. I/O module identifi-
cation is in the four most significant bits (MSB). It identifies the
I/O module to the control module. It also verifies the I/O
expander bus communication integrity and the control module
configuration. I/O module status is the least significant bit
(LSB). During initialization, the control module writes data to
the output register and default register, and forces this bit to a
logic one. A reset or time-out condition (bus fault error) resets
it to a logic zero. Default data is normally written only during
control module start-up. The control module reads the module
status bit to test for a change in the state of the module. It uses
this bit as a signal to rewrite data to the module to insure that
proper default values are in the default register. A fuse LED
status bit reflects the state of the LED: logic one (on), logic zero
(off).
Output Data
Output data is an eight-bit byte sent to the output registers.
Each bit of the digital output byte corresponds to one output.
The bit value reflects the state of the output. Logic one turns a
field device on; logic zero turns it off.
Default Data
Default data is an eight-bit byte sent to the default registers. It
is set by the control module configuration (function code 128).
The function of this data is the same as the output data but is
used only when a time-out condition occurs.
LOGIC POWER
Logic power (+5 VDC) drives the DSO module circuits. It con-
nects through edge connector P1 shown in Figure 3-1.