Bailey Infi 90 IMDSM04 User manual

®
®
Process Control and
Automation Solutions
from Elsag Bailey Group
E96-308
Pulse Input Slave Module
(IMDSM04)

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
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DAMAGE MAY RESULT.
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TION SHOULD BE EXERCISED WITH REGARD TO THE USE OF PORTABLE COMMUNICATIONS EQUIP-
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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.
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NOTICE
The information contained in this document is subject to change without notice.
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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
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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-E96-308A
Preface
The Pulse Input Slave Module (IMDSM04) is an interface used
to bring eight separate process field signals into the Infi 90
process management system. These pulse inputs are used by
master modules to monitor and control a process.
This instruction explains the slave module features, specifica-
tions and operation. It details the procedures you must follow
to set up and install an IMDSM04 module, and explains status
indicators that help in system test and diagnosis.
The system engineer or technician using the IMDSM04 should
read and understand this instruction before installing and
operating the slave module. In addition, a complete under-
standing of the Infi 90 system is beneficial.

I-E96-308A
®
List of Effective Pages
Total number of pages in this instruction is 38, 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 3-7 Original
4-1 Original
5-1 through 5-2 Original
6-1 Original
7-1 Original
8-1 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-E96-308A
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 (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. 3-6)
SPECIFIC
CAUTIONS Damage to the DSM may result if you select voltage range 1 for an
input using a preamplifier. (p. 3-4)

I-E96-308A 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 moretlles. (p. 3-6)
ATTENTIONS
D’ORDRE
SPÉCIFIQUE
La selection de la gamme 1 de tension dans le cas d’une entree util-
isant un preamplificateur pourrait entrainer des dommages au mod-
ule DSM. (p. 3-4)

Table of Contents
Page
I-E96-308A 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 MANUAL .......................................................................................1-3
GLOSSARY OF TERMS AND ABBREVIATIONS .............................................................1-4
REFERENCE DOCUMENTS..........................................................................................1-5
NOMENCLATURE ........................................................................................................1-5
SPECIFICATIONS.........................................................................................................1-6
SECTION 2 - DESCRIPTION AND OPERATION........................................................................2-1
INTRODUCTION...........................................................................................................2-1
OPERATING MODES....................................................................................................2-2
Totalize Operating Mode.........................................................................................2-2
Frequency Operating Mode ....................................................................................2-2
Period Operating Mode...........................................................................................2-2
INPUT MODES .............................................................................................................2-2
Externally Powered Normal Logic Level Input Mode ................................................2-3
Internally Powered Contact Input Mode..................................................................2-3
Low Level Input Mode ............................................................................................2-3
MODULE DESCRIPTION ..............................................................................................2-3
Multiplexer and Input State Circuitry .....................................................................2-4
Time Base Generation............................................................................................2-4
Slave Expander Bus Interface ................................................................................2-4
Count and Output Memory ....................................................................................2-4
Mode Memory ........................................................................................................2-5
Sequencer..............................................................................................................2-5
Inputs....................................................................................................................2-5
Input Section .........................................................................................................2-5
Power Supply.........................................................................................................2-6
Connector Functions..............................................................................................2-6
SECTION 3 - INSTALLATION.....................................................................................................3-1
INTRODUCTION...........................................................................................................3-1
SPECIAL HANDLING ....................................................................................................3-1
UNPACKING AND INSPECTION ....................................................................................3-1
SETUP .........................................................................................................................3-2
Slave Address Selection Switch (S1) .......................................................................3-2
Setting Preamplifier Select Switches S2 and S3 ......................................................3-4
Input Jumper Settings ...........................................................................................3-4
Connecting Voltage Selection Jumpers ...................................................................3-5
Connecting Debounce Jumpers..............................................................................3-5
Termination Unit/Module Configuration ................................................................3-5
Physical Installation...............................................................................................3-6

iv I-E96-308A
Table of Contents (continued)
Page
®
SECTION 3 - INSTALLATION
(continued)
WIRING CONNECTIONS AND CABLING ....................................................................... 3-6
Wiring ................................................................................................................... 3-6
Cable Connections................................................................................................. 3-7
FUSING ....................................................................................................................... 3-7
PRE-OPERATING ADJUSTMENTS................................................................................ 3-7
SECTION 4 - OPERATING PROCEDURES................................................................................4-1
INTRODUCTION .......................................................................................................... 4-1
START-UP.................................................................................................................... 4-1
SECTION 5 - TROUBLESHOOTING...........................................................................................5-1
INTRODUCTION .......................................................................................................... 5-1
ERROR MESSAGES AND CORRECTIVE ACTION ......................................................... 5-1
MASTER MODULE ERRORS ........................................................................................ 5-1
MODULE PIN CONNECTIONS ...................................................................................... 5-2
SECTION 6 - MAINTENANCE.....................................................................................................6-1
INTRODUCTION .......................................................................................................... 6-1
MAINTENANCE SCHEDULE ........................................................................................ 6-1
SECTION 7 - REPAIR/REPLACEMENT PROCEDURES...........................................................7-1
INTRODUCTION .......................................................................................................... 7-1
MODULE REPAIR/REPLACEMENT.............................................................................. 7-1
SECTION 8 - SUPPORT SERVICES...........................................................................................8-1
INTRODUCTION .......................................................................................................... 8-1
REPLACEMENT PARTS AND ORDERING INFORMATION ............................................. 8-1
TRAINING.................................................................................................................... 8-1
TECHNICAL DOCUMENTATION................................................................................... 8-1
APPENDIX A - NTDI01
TERMINATION UNIT CONFIGURATION...................................................................................A-1
INTRODUCTION ..........................................................................................................A-1
CONFIGURING INPUTS ...............................................................................................A-1
APPENDIX B - NIDI01
TERMINATION MODULE CONFIGURATION............................................................................B-1
INTRODUCTION ..........................................................................................................B-1
INPUT CIRCUITS FOR NIDI01......................................................................................B-1
CONFIGURING INPUTS FOR NIDI01 ............................................................................B-2
CONNECTING THE POWER SUPPLY FOR NIDI01 ........................................................B-2

List of Figures
No. Title Page
I-E96-308A v
1-1. Infi 90 Communication Levels ................................................................................1-1
2-1. Input Circuit..........................................................................................................2-1
2-2. Module Block Diagram...........................................................................................2-1
3-1. Switches and Jumpers...........................................................................................3-2
3-2. IMDSM04 Cable Connections.................................................................................3-7
A-1. Dipshunts and Terminal Blocks ............................................................................ A-1
A-2. Dipshunt Installed for NTDI01 .............................................................................. A-2
A-3. Dipshunt Configurations for NTDI01 A-2
A-4. Terminal Assignments for NTDI01......................................................................... A-2
A-5. Cable Connections for NTDI01 .............................................................................. A-3
B-1. Input Circuit......................................................................................................... B-1
B-2. Termination Assignments for NIDI01..................................................................... B-2
B-3. Configuration Summary for NIDI01 ....................................................................... B-2
B-4. Power Supply Connections for NIDI01 ................................................................... B-3
B-5. Cable Connections for NIDI01 ............................................................................... B-3
List of Tables
No. Title Page
3-1. Address Switch Settings (MFP/LMM)......................................................................3-3
3-2. Voltage Jumpers Selections....................................................................................3-4
3-3. Debounce Jumpers Selections ...............................................................................3-5
5-1. P1 Power Pin Connections......................................................................................5-2
5-2. P2 Slave Expander Bus Connections ......................................................................5-2
5-3. P3 Input Signal Pin Connections ............................................................................5-2
6-1. Maintenance Schedule ...........................................................................................6-1

OVERVIEW
I-E96-308A 1 - 1
SECTION 1 - INTRODUCTION
OVERVIEW
The Pulse Input Slave Module (IMDSM04) brings eight separate
pulse signals into the Infi 90 system for processing and moni-
toring. It interfaces process field inputs with the Infi 90 Process
Management System. Master modules provide the control
functions; slave modules provide I/O to the master modules.
This manual explains the purpose, operation and maintenance
of the Pulse Input Slave Module (DSM). It addresses handling
precautions and installation procedures. Figure 1-1 illustrates
the Infi 90 communication levels and the position of the DSM
module within these levels.
Figure 1-1. Infi 90 Communication Levels
COMMUNICATION HIGHWAY (INFI-NET OR PLANT LOOP)
CONTROLWAY
MFP
DSM
TU/TM
DIGITAL
INPUTS
OTHER MODULES
OTHER SLAVES
SLAVE EXPANDER BUS
COMMUNICATION
MODULES
TP35738A

INTRODUCTION
INTENDED USER
1 - 2 I-E96-308A
®
INTENDED USER
System engineers and technicians should read this manual
before installing and operating the DSM. A module SHOULD
NOT be put into operation until you read and understand this
instruction. You can refer to the Table of Contents to find spe-
cific information after the module is operating.
MODULE DESCRIPTION
The DSM has a single printed circuit board that occupies one
slot in a Module Mounting Unit (MMU). Two captive screws on
the module faceplate secure the DSM to the MMU. The slave
module has three card edge connectors for external signals and
power (P1, P2 and P3). P1 connects to common (ground) and +5
VDC power (refer to Table 5-1). P2 connects the module to the
slave expander bus to communicate with a master module
(refer to Table 5-2). The pulse signals input through connector
P3 using a cable connected to a Termination Unit (TU) or Ter-
mination Module (TM) (refer to Table 5-3). The terminal blocks
(physical connection points) for field wiring are on the TU/TM.
Each input can respond to either 4 to 6 VDC or 21.6 to 27 VDC
and either the rising or falling edge of the signal. In addition,
channels 1 and 2 can be routed through preamplifiers so they
can respond to inputs from 50 mV (peak to peak) to 10 V (peak
to peak).
The DSM set up information goes into an MFP using function
codes. Use either a configuration tuning module or an operator
interface unit. Function codes start the three modes of DSM
operation. The three operating modes are: Totalize, Frequency,
or Period. Configure the MFP to set the DSM inputs for one of
these modes. Refer to Section 4 for more information.
FEATURES
The DSM is an active interface device that supplies data to the
Infi 90 Multi-Function Processor (MFP). The DSM conditions,
converts and processes pulse inputs such as low level ampli-
tude pulses, sinewaves, logic level pulses, or contact closures
into digital signals. Applications for the DSM include: turbine
flowmeters, tachometers, Wattmeters, proximity sensors and
counters. One slave provides eight independent pulse or fre-
quency inputs to the master module. The input signals are
optically isolated. The DSM also Interfaces to existing
Network 90 Multi-Function Controllers (MFCs).
The modular design of the DSM, as with all Infi 90 modules,
allows for flexibility when you are creating a process manage-
ment system strategy. It can bring eight separate pulse signals
in three voltage ranges. Two ranges are 4 to 6 VDC and 21.6 to
27 VDC (the 21.6 to 27 VDC range allows connection of dry

INTRODUCTION
INSTRUCTION CONTENT
I-E96-308A 1 - 3
contact inputs). The third range is input to the preamplifiers
on channels 1 and 2 (for low level pulse inputs between 50 mil-
livolts and 10 Volts peak to peak). The DSM connects inputs to
the Infi 90 system without separate converters.
You can select individual voltage and response time with jump-
ers on the module to configure each input. Selectable response
times (fast or slow) allow the Infi 90 system to compensate for
process field device debounce time.
The slave provides 16 bit resolution in the input channels for
frequencies up to 50 kilohertz. It makes high resolution mea-
surements of low frequency signals at selected rates for periods
between 20 microseconds and 655 x 103 seconds. The slave
can count the number of rising or falling edges of input signals
and measure the time between the pulse edges. Refer to
Section 2 for more information.
INSTRUCTION CONTENT
This manual has eight sections.
Introduction Is an overview of the DSM: Features, description and
specifications.
Description and
Operation Explains the module operation and input circuitry.
Installation Describes precautions to observe when handling DSM modules
and setup procedures required before module operation. This
section also discusses switch and jumper settings, and instal-
lation procedures.
Operating Procedures Explains the start-up of the slave module.
Troubleshooting Describes the error indications and corrective actions to take.
Maintenance Has a maintenance schedule for the slave module.
Repair/Replacement
Procedures Describes how to replace a slave module.
Support Services Provides replacement part ordering information. It explains
other areas of support that Bailey Controls provides.
HOW TO USE THIS MANUAL
Read this manual before handling the DSM module. Refer to
the sections in this list as needed for more information.
1. Read Section 4 before you connect the IMDSM05.
2. Read and do the steps in Section 3.

INTRODUCTION
GLOSSARY OF TERMS AND ABBREVIATIONS
1 - 4 I-E96-308A
®
3. Refer to Section 5 for what to do if a problem occurs.
4. Refer to Section 6 for the scheduled steps needed to main-
tain the DSM.
5. Refer to Section 7 for how to replace a module.
6. Refer to Section 8 for how to order parts. This section also
describes some of the services Bailey Controls offers.
GLOSSARY OF TERMS AND ABBREVIATIONS
Term Definition
Configuration A control strategy with function blocks.
Controlway A redundant peer-to-peer communication path for point data transfer between
intelligent 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 controllerwith data acquisition and
information processing capabilities.
MMU Module Mounting Unit; a card cage that provides electrical and communication
support 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.

INTRODUCTION
GLOSSARY OF TERMS AND ABBREVIATIONS (continued)
I-E96-308A 1 - 5
GLOSSARY OF TERMS AND ABBREVIATIONS
(continued)
REFERENCE DOCUMENTS
NOMENCLATURE
The following modules and equipment can be used with a DSM
module:
Term Definition
Pulse Inputs Pulse inputs for the IMDSM04 may be low level amplitude pulses, sinewaves, logic
level pulses, or contact closures into digital signals. Examples are: turbine
flowmeters, tachometers, Wattmeters, proximity sensors and counters.
Slave Expander
Bus Parallel address/data bus between the master module and the slave.
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
termination 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.
Document
Number Document
I-E96-201 Multi-Function Processor (IMMFP01)
I-E96-202 Multi-Function Processor (IMMFP02)
I-E96-209 Logic Master Module (IMLMM02)
I-E93-911 Termination Unit Manual
I-E96-110 Operator Interface Station
I-E96-701 Engineering Work Station
I-E92-501-2 Configuration and Tuning Terminal
I-E93-900-20 Function Code Application Manual
Nomenclature Hardware
IMMFP01/02/03 Multi-Function Processor Module
NIDI01 Termination Module, Digital Inputs
NTDI01 Termination Unit, Digital Inputs
NKTM01 Cable, Termination Module
NKTU02 Cable, Termination Module
NKTU01 Cable, Termination Unit

INTRODUCTION
SPECIFICATIONS
1 - 6 I-E96-308A
®
SPECIFICATIONS
Power Supply
Voltages: ± 5 VDC Logic Supply ± 5%
± 24 VDC I/O Supply + 12%, -10%
Current Consumption: 5 VDC 1.4 Amps typical, 1.5 Amps maximum
24 VDC 62 mA typical, 70 mA maximum
Inputs
Input Voltages: Range 1, 5 VDC Supply: 4.0 VDC to 6.0 VDC
Range 2, 24 VDC Supply: 21.6 VDC to 27.0 VDC
Range 3, Preamplifiers: 50 mV (peak to peak)
to 10 V (peak to peak)
Max. Input Signal Current
at Max. Input Voltage: Range 1: 14.8 mA at 6 VDC Range 2: 8.4 mA at 24 VDC
Range 3: 0.4 mA at 10 V (peak to peak)
Logic 1 Input Voltages: Range 1: 4 VDC minimum, 6 VDC maximum
Range 2: 21.6 VDC minimum, 27 VDC maximum
Range 3: 25.0 mV peak minimum, 5 V peak maximum
Logic 0 Input Voltages: Range 1: 0 V minimum, 1.0 V maximum
Range 2: 0 V minimum, 2.0 V maximum
Range 3: -5 V peak in., -25.0 mV peak maximum
Debounce Times ON time 8.5 milliseconds (typical)
OFF time 8.5 milliseconds (typical)
Input Signal Frequency Limit Upper frequency limit for using debounce: 40Hz
Mode Accuracy Totalize: ± 0 Counts
Frequency Count: ± 1 Count
Period Determination: ± 1 Count
Maximum Input Frequency 50 kHz (at 50% duty cycle)
Timebase Accuracy ±0.033%
Isolation Voltage 150 V RMS channel to channel
350 V RMS inputs to logic
Surge Withstand Meets requirements of IEEE Surge Capability Standard 472-1974,
on all debounced inputs
NOTE: If you select a preamplifier for a channel, the counter associated
with that channel may increment during surge pulsing.
Mounting Uses 1 slot in Infi 90 Module Mounting Unit.
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 (32oto 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
Certification CSA certified for use as process control equipment in an ordinary
(nonhazardous) location.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

INTRODUCTION
I-E96-308A 2 - 1
SECTION 2 - DESCRIPTION AND OPERATION
INTRODUCTION
This section explains the inputs and input circuitry, control
logic, logic power and connections for the Pulse Input Slave
Module (DSM). The DSM is a digital input interface to a
Multi-Function Processor (MFP) module. The slave has eight
pulse input circuits that condition process signals, see Figure
2-1. Input signals are processed, stored and sent to the master
module. The master module communicates with its slave mod-
ule on a 12-line slave expander bus shown in Figure 2-2. Each
slave on the slave expander bus has a unique address set by
the slave address dipswitch.
Figure 2-1. Input Circuit
TP35737A
IMDSM04 INPUT CIRCUIT TERMINATION
CABLE
+5 VDC
J1-J8
J9-J16
A
B
DCV
Figure 2-2. Module Block Diagram
10 MHz
CLOCK TIME BASE GENERATOR
MODE
MEMORY
OUTPUT
BUFFER
16 X 16
MEMORY
16 BIT
COUNTER
INPUT STATE
LOGIC MULTIPLEXER INPUT SIGNAL
CONDITIONING
PULSE INPUT
CHANNEL
THROUGH P3
CARD EDGE
CONNECTOR
1
2
3
4
5
6
7
8
SEQUENCER
EXPANDER
BUS
INTERFACE
EXPANDER BUS (P2) MFP
TP35728A

DESCRIPTION AND OPERATION
OPERATING MODES
2 - 2 I-E96-308A
®
OPERATING MODES
After installing the DSM, enter the module address and the
input specifications into the MFP along with the normal oper-
ating configuration. Use either an Engineering Work Station
(EWS), Operator Interface Station (OIS), Configuration Tuning
Module (CTM) or a Configuration Tuning Terminal (CTT). Enter
the DSM specifications into a MFP using the appropriate func-
tion codes for the three modes of DSM operation. The three
operating modes are: Totalize (FC 104), Frequency (FC
103), or Period (FC 102). Configure the MFP to set the DSM
inputs for one of these modes.
Totalize Operating Mode
In Totalize mode, the DSM counts the total number of pulses of
an input up to 65,534 or until the master resets the counter.
The MFP module sends a request to the DSM (at a user speci-
fied rate). The slave replies with a running total of the number
of input pulses it has accumulated for each channel in the
totalize mode. The MFP can read a channel or read and reset a
channel.
Frequency Operating Mode
In Frequency mode, the DSM counts the number of input
pulses or cycles that occur in a preset period on a channel. The
measurement range is 0.15 millihertz to 50 kilohertz, select-
able in one of 5 range segments. The range segments are speci-
fied by the function code parameters. The DSM reads the value
and sends it to the MFP when the MFP sends a request. The
resolution of the DSM depends on your application.
Period Operating Mode
In Period mode, the DSM will count the number of time-base
pulses that occur during the period of an input pulse. Each
input channel can use a different time-base clock to measure
the period of the input signal. The time-base pulses may be set
to 0.1 millisecond, 1.0 millisecond, 10 milliseconds, 0.1 sec-
ond, 1.0 second, or 10 seconds. The resolution of the DSM
depends on your application.
INPUT MODES
Each of the eight input channels can be set to one of two possi-
ble modes. A third mode is possible for channels 1 and 2 in
which the inputs may be routed to preamplifiers on the DSM to
sense low level signals. The three modes are: externally pow-
ered normal logic level input, internally powered contact input
and low level input (only on channels 1 and 2).

DESCRIPTION AND OPERATION
MODULE DESCRIPTION
I-E96-308A 2 - 3
Externally Powered Normal Logic Level Input Mode
Set up the externally powered normal logic level input mode
with self powered input circuits isolated from the pulse pro-
cessing circuits. There are two available ranges that may be set
by jumpers J1 through J8 on the module. Range 1 is 4.0 VDC
to 6.0 VDC and range 2 is 21.6 VDC to 27 VDC.
Internally Powered Contact Input Mode
The 24 VDC input and output power supply uses the internally
powered contact input mode. It is used to sense open and
closed conditions in the input circuit. Set up this mode by
making proper dipshunt connections on the termination unit.
Voltage range 2 must be selected on the module for this mode.
Low Level Input Mode
The Low Level input mode (only for channels 1 and 2) detects
differential input voltage. Voltages can range from 50 millivolts
(p-p) to 10 Volts (p-p). Set voltage ranges by routing the inputs
through preamplifiers. Switch the preamplifiers in or out with
slide switches S2 and S3 on the DSM. An input voltage of 25
millivolts or more is a logic one in the module, and a voltage of
less than -25 millivolts is a logic 0. To select this range you also
must select range 2.
The input isolation block has current limiters and optocou-
plers to isolate the sixteen field inputs from the module cir-
cuitry. All inputs pass through high-speed, open collector,
opto-isolators. The input signals go through the Schmitt-trig-
ger inverters to enhance the pulse definition.
Between the opto-isolators and the inverters are RC circuits
that produce an 8.5 millisecond debounce time delay. Connect
jumpers J9 through J16 for the time delay. The input circuits
provide 350 Volts RMS isolation between input and logic cir-
cuits, and 150 Volts RMS isolation between input channels.
The DSM can be divided into functional modules, see Figure
2-2. These modules provide the control functions in the DSM.
MODULE DESCRIPTION
Figure 2-2 shows the DSM block diagram to illustrate signal
flow through the module. The input circuits connect to the ter-
mination unit that connects them through the termination
unit cable to the P3 edge connector on the DSM.

DESCRIPTION AND OPERATION
MODULE DESCRIPTION
2 - 4 I-E96-308A
®
Multiplexer and Input State Circuitry
The eight conditioned input signals from the Schmitt-trigger
inverters are time-division multiplexed to use a single 16-bit
counter. A channel counter increments the multiplexer. Each
channel processes in turn every 7.2 microseconds (every 7.8
microseconds if a slave expander bus transaction takes place).
The channel counter spends about 900 nanoseconds process-
ing each input before moving onto the next channel.
When the multiplexer selects a channel, an 8-bit shift register
stores the input state (0 or 1). The register shifts for each chan-
nel sample. The 8-bit register will hold the previous input state
for each complete count. The MFP may read the present input
state.
Time Base Generation
The six time-base signals generated here are multiplexed for
greatest resolution for the sampled input. The choice recorded
in the mode memory determines the time-base signal selected.
Present and previous time-base pulse states are stored for use
in determining count completion.
Slave Expander Bus Interface
The expander bus interface translates the 8-bit bidirectional
expander bus into two 8-bit unidirectional internal busses; one
input and one output. Information is communicated over the
expander bus by sending either three or five bytes in sequence
depending on the operation. The operations that the MFP can
request from the DSM are: read module type status, read input
states, write channel configuration, read channel and reset
and read channel.
The expander bus interface receives an 8-bit module address
from the MFP and compares it to the address set on S1. If the
addresses match, then the module will respond to the bytes
that follow. If the function code byte specifies a read operation,
the interface will send the selected information from the output
buffer.
Count and Output Memory
There is only one 16 bit counter. All 8 input channels share the
counter. A 16-bit memory location stores the count value asso-
ciated with each channel. The memory (count memory) takes
up one-half of a 16 x 16 memory array made up of four RAM
memory chips.
The other half the memory array (output memory) stores the
final or total accumulated count. Whenever the MFP reads a

DESCRIPTION AND OPERATION
MODULE DESCRIPTION
I-E96-308A 2 - 5
channel, the 16-bit count value in output memory for that
channel is transferred into an output buffer comprised of two
output memory buffer chips.
The output buffer is enabled at the appropriate time to place
the count value into the expander bus. If the operation is a
reset-read, after transferring the count value, the buffer clears
both the count memory and the output memory for that chan-
nel. The count will be flagged as invalid if the count is not com-
plete. The count will not be valid until at least one input pulse
is complete, but will always be valid by the end of the second
pulse.
Mode Memory
The mode memory stores the information that determines how
each input is to be handled. Each input can be set for one of
three modes: totalization, frequency or period. The mode for an
input can be set so that the circuitry counts on either the ris-
ing or falling part of the signal. The frequency mode can be set
for three ranges and the period mode can be set for one of six
ranges.
The mode memory occupies one-half of an 8 x 16 memory
array. The other half is the data valid memory. The array stores
the information here necessary to decide if the data valid bit
should be set or not.
Sequencer
Three programmable array logic integrated circuits (ICs) make
up the sequencer. The sequencer is the control center for the
DSM. It provides all the timing signals needed by the other cir-
cuit blocks.
Inputs
Digital field inputs are voltages of either 4 to 6 VDC, 21.6 to 27
VDC, 50 millivolts and 10 Volts (peak to peak). These voltages
indicate an energized (ON) field device; a 0 Volt input indicates
a de-energized (OFF) field device. Jumpers on the DSM select
the voltage level and debounce for each input. The Installation
section explains the jumper connections.
Input Section
The field inputs connect to the termination unit. It sends them
through the termination unit cable to the P3 edge connector on
the DSM. Each of the eight input channels can be set to one of
two possible modes. A third mode is possible for channels 1
and 2. Inputs may be routed to preamplifiers on the DSM to
sense low level signals. The Installation section covers the spe-
cific connections needed for each mode.