Bailey INFI 90 IMASO01 User manual

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Process Control and
Automation Solutions
from Elsag Bailey Group
E96-303
Analog Slave Output Module
(IMASO01)
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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
LA PLUPART DES ÉQUIPEMENTS ÉLECTRONIQUES SONT SENSIBLES AUX PERTURBATIONS PAR
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
contained herein and/or for the fitness for any particular use and/or for the performance of any material and/
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.
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I-E96-303A1 31 March 1993
Preface
The Analog Slave Output module (IMASO01) outputs fourteen
analog signals from the INFI 90 Process Management System
to process field devices. Master modules use these outputs to
control a process.
This instruction explains the slave module features, specifica-
tions and operation. It details the procedures to follow to set up
and install an Analog Slave Output (ASO) module. It explains
troubleshooting, maintenance and module replacement proce-
dures.
The system engineer or technician using the ASO 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.
This instruction includes updated information that covers
changes to the specification of the ASO module.
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31 March 1993 I-E96-303A1
®
List of Effective Pages
Total number of pages in this instruction is 38, consisting of the following:
Page No. Change Date
Preface 31 March 1993
List of Effective Pages 31 March 1993
iii through vii Original
1-1 through 1-4 Original
1-5 31 March 1993
2-1 through 2-6 Original
3-1 through 3-6 Original
4-1 through 4-2 Original
5-1 through 5-4 Original
6-1 Original
7-1 Original
8-1 Original
A-1 through A-3 Original
B-1 through B-2 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.
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vi I-E96-303A
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. 3-5, 5-3)
The outputs go to 0% at start-up. On error detection, these outputs
will change to a fixed value. This value must be selected by the user
(and configured in the MFP) to ensure safe operation when error
conditions occur. (p. 3-2)
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I-E96-303A vii
Sommaire de Sécurité
AVERTISSEMENT
D'ORDRE
GENERAL
Environment de l'equipement
Nes pas soumettre les composantes a une atmosphere corrosive
lors du transport, de l'entreposage ou de l'utilisation.
Risques de chocs electriques lor de l'entretien
S'assurer de debrancher l'alimentation ou de prende les precau-
tions necessaires a eviter tout contact avec des composants sours
tension lors de l'entretien.
Precautions de Manutention
Ce module contient des composantes sensibles aux decharges
electro-statiques.
AVERTISSEMENT
D'ORDRE
SPECIFIQUE
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. 3-5, 5-3)
Les signaux de sortie prennent automatiquement la valeur de 0%
au moment demarrage. Quand une erreur est decelee, ces signaux
prennent une valeur fixe. Cette valeur doit etre affectee par l'utili-
sateur (et configuree dans le MFP), de sorte a assurer un fonction-
nement sur en cas d'erreur. (p. 3-2)
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Table of Contents
Page
I-E96-303A iii
SECTION 1 - INTRODUCTION....................................................................................................1-1
OVERVIEW ..................................................................................................................1-1
INTENDED USER.........................................................................................................1-2
MODULE DESCRIPTION ..............................................................................................1-2
FEATURES...................................................................................................................1-2
INSTRUCTION CONTENT .............................................................................................1-2
HOW TO USE THIS MANUAL .......................................................................................1-3
GLOSSARY OF TERMS AND ABBREVIATIONS .............................................................1-3
NOMENCLATURE ........................................................................................................1-4
SPECIFICATIONS.........................................................................................................1-5
REFERENCE DOCUMENTS..........................................................................................1-5
SECTION 2 - DESCRIPTION AND OPERATION........................................................................2-1
INTRODUCTION...........................................................................................................2-1
MODULE BLOCK DIAGRAM.........................................................................................2-1
Analog Output Circuits ..........................................................................................2-1
Control Logic .........................................................................................................2-2
Output Logic..........................................................................................................2-3
Readback Logic ......................................................................................................2-3
Default Operation ..................................................................................................2-3
OUTPUT CIRCUIT CONNECTIONS ...............................................................................2-4
SLAVE EXPANDER BUS...............................................................................................2-4
UNIVERSAL SLAVE EXPANDER BUS INTERFACE........................................................2-4
MODULE DATA............................................................................................................2-5
Status Data ...........................................................................................................2-5
Readback Data ......................................................................................................2-5
Output Data ..........................................................................................................2-5
LOGIC POWER.............................................................................................................2-6
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 ....................................................................................3-1
SETUP/PHYSICAL INSTALLATION ...............................................................................3-2
Slave Address Selection Switch (S1) .......................................................................3-2
Analog Output Mode Switch (S2 through S15) ........................................................3-4
Termination Unit/Module Configuration ................................................................3-4
Physical Installation...............................................................................................3-4
WIRING CONNECTIONS AND CABLING .......................................................................3-5
Wiring....................................................................................................................3-6
Cable Connections .................................................................................................3-6
FUSING........................................................................................................................3-6
PRE-OPERATING ADJUSTMENTS ................................................................................3-6
SECTION 4 - OPERATING PROCEDURES................................................................................4-1
INTRODUCTION...........................................................................................................4-1
MODULE STATUS INDICATOR.....................................................................................4-1
START-UP PROCEDURES ............................................................................................4-2
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iv I-E96-303A
Table of Contents (continued)
Page
®
SECTION 5 - TROUBLESHOOTING...........................................................................................5-1
INTRODUCTION .......................................................................................................... 5-1
ERROR INDICATIONS AND CORRECTIVE ACTION ...................................................... 5-1
Status LED............................................................................................................ 5-1
Master Module Errors............................................................................................ 5-1
MODULE PIN CONNECTIONS...................................................................................... 5-3
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 PROCEDURES ...................................................... 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 - TERMINATION UNIT (NTDI01)
CONFIGURATION......................................................................................................................A-1
INTRODUCTION ..........................................................................................................A-1
APPENDIX B - TERMINATION MODULE (NIDI01) CONFIGURATION....................................B-1
INTRODUCTION ..........................................................................................................B-1
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List of Figures
No. Title Page
I-E96-303A v
1-1. INFI 90 Communication Levels...............................................................................1-1
2-1. Analog Slave Output Module Block Diagram ..........................................................2-1
2-2. Analog Output Circuit............................................................................................2-2
3-1. Analog Slave Output Module ..................................................................................3-2
3-2. Address Select Switch (S1) .....................................................................................3-3
3-3. IMASM01 Cable Connections and Termination .......................................................3-6
4-1. IMASO01 Front Panel ............................................................................................4-1
A-1. NTDI01 Circuit Diagram (Voltage Mode) ................................................................ A-1
A-2. NTDI01 Circuit Diagram (Current Mode) ............................................................... A-2
A-3. NTDI01 Terminal Assignments.............................................................................. A-3
B-1. NIDI01 Circuit Diagram (Voltage Mode) ................................................................. B-1
B-2. NIDI01 Circuit Diagram (Current Mode) ................................................................ B-2
B-3. NIDI01 Terminal Assignments............................................................................... B-2
List of Tables
No. Title Page
3-1. Address Switch Settings (S1)..................................................................................3-3
3-2. Analog Output Mode Switch Settings .....................................................................3-4
4-1. IMASO01 Status LED Indicator ..............................................................................4-2
5-1. Status LED Indications and Corrective Actions ......................................................5-2
5-2. P1 Power Pin Connections......................................................................................5-3
5-3. P2 Expander Bus Connections ...............................................................................5-3
5-4. P3 Output Pin Connections ....................................................................................5-4
6-1. Maintenance Schedule ...........................................................................................6-1
A-1. NTDI01 Dipshunt Configuration............................................................................ A-2
B-1. NIDI01 Jumper Configuration ............................................................................... B-2
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OVERVIEW
I-E96-303A 1 - 1
SECTION 1 - INTRODUCTION
OVERVIEW
The Analog Slave Output module (IMASO01) outputs fourteen
separate analog signals that the INFI 90 system uses to control
a process. It is an interface between the process and the INFI
90 Process Management System. Master modules perform the
control functions; slave modules provide the I/O.
This manual explains the purpose, operation and maintenance
of the slave module. It addresses handling precautions and
installation procedures. Figure 1-1 illustrates the INFI 90 com-
munication levels and the position of the ASO module within
these levels.
Figure 1-1. INFI 90 Communication Levels
COMMUNICATION HIGHWAY (INFI-NET OR PLANT LOOP)
CONTROLWAY
MFP
ASO
TU/TM
ANALOG
OUTPUTS
OTHER MODULES
OTHER SLAVES
SLAVE EXPANDER BUS
COMMUNICATION
MODULES
TP27155A
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INTRODUCTION
INTENDED USER
1 - 2 I-E96-303A
®
INTENDED USER
System engineers and technicians should read this manual
before installing and operating the ASO module. A module
SHOULD NOT be put into operation until this instruction is
read and understood. You can refer to the Table of Contents to
find specific information after the module is operating.
MODULE DESCRIPTION
The ASO consists of a single printed circuit board (PCB) that
occupies one slot in a Module Mounting Unit (MMU).
Dipswitches on the PCB configure each of the analog outputs.
Two captive screws on the faceplate secure the module to the
MMU. A front panel LED indicates the module status.
The slave module has three connection points for external sig-
nals and power (P1, P2 and P3). P1 connects to logic power that
drives the module circuits (refer to Table 5-2). P2 connects it to
the slave expander bus to communicate with a Multi-Function
Processor (MFP) module (refer to Table 5-3). The analog signals
are output through connector P3 using a cable connected to a
Termination Unit (TU) or Termination Module (TM) (refer to
Table 5-4). The terminal blocks (physical connection points) for
field wiring are on the TU/TM.
FEATURES
The modular design of the ASO, as with all INFI 90 modules,
allows for flexibility when you are creating a process manage-
ment strategy. It outputs fourteen analog signals that an MFP
uses to control a process.
The ASO analog outputs are signals of 1 to 5 VDC or 4 to 20
mA. Individual switches configure the mode (current or voltage)
for each output. This capability allows the INFI 90 system to
match the process requirements.
The front panel LED provides a visual indication of the module
status to aid in system test and diagnosis. You can remove or
install an ASO module without powering the system down.
INSTRUCTION CONTENT
This manual consists of eight sections. Introduction is an over-
view of the ASO module: Features, description and specifica-
tions. Description and Operation explains the module
operation and output circuitry. Installation describes precau-
tions to observe when handling ASO modules, and setup proce-
dures required before module operation. This section discusses
switch settings, and installation procedures. Operating Proce-
dures explains the front panel indicator and start-up of the
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INTRODUCTION
HOW TO USE THIS MANUAL
I-E96-303A 1 - 3
slave module. Troubleshooting describes the error indications
and corrective actions to take. Maintenance has a maintenance
schedule for the slave module. Repair/Replacement Proce-
dures details the procedures to replace a slave module. Sup-
port Services provides replacement part ordering information.
It explains other areas of support that Bailey Controls provides.
HOW TO USE THIS MANUAL
Read this manual through in sequence. It is important to
become familiar with the entire contents of this manual before
using the ASO. The manual is organized in sections to enable
you to find specific information quickly.
1. Read and do the steps in Section 1.
2. Read Section 4 before powering up the module.
3. Refer to Section 5 if a problem occurs.
4. Refer to Section 6 for scheduled maintenance require-
ments.
5. Use Section 8 when ordering replacement parts.
GLOSSARY OF TERMS AND ABBREVIATIONS
Term Definition
Analog A continuous time signal with an infinite number of values.
CTT Configuration and Tuning Terminal; hand held module that provides a local
means for system configuration, tuning and diagnostics.
Configuration A control strategy with function blocks.
Controlway A redundant peer-to-peer communication path for status and point data
transfer between intelligent modules within a process control unit.
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.
Function Block A function code located in the user defined memory of a multi-function pro-
cessor.
Function Code An algorithm which defines specific functions. These functions are linked
together to form the control strategy.
LED Light Emitting Diode; the module front panel indicator that shows status and
error messages.
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INTRODUCTION
GLOSSARY OF TERMS AND ABBREVIATIONS (continued)
1 - 4 I-E96-303A
®
GLOSSARY OF TERMS AND ABBREVIATIONS
(continued)
NOMENCLATURE
The following modules and equipment can be used with an
ASO:
Term Definition
LSB Least Significant Bit; the bit of a binary number that carries the least numeri-
cal 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 acqui-
sition and information processing capabilities.
MMU Module Mounting Unit; a card cage that provides electrical and communica-
tion support for INFI 90 modules.
MSB Most Significant Bit; the bit of a binary number that carries the most numeri-
cal 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.
PAL Programmable Array Logic; an integrated circuit that performs logic func-
tions based on a program that is downloaded to it.
PCU Process Control Unit; rack type industrial cabinet that contains master, slave
and communication modules, and their communication paths.
RAM Random Access Memory; processor memory that has both read and write
capability. This memory is volatile; its contents are lost when power is
removed.
Slave Expander
Bus Parallel address/data bus between the master module and the slave that
point data and slave status data are exchanged over.
TM Termination Module; provides input/output connection between plant equip-
ment 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.
Nomenclature Hardware
IMMFP01/02 Multi-Function Processor Module
NTDI01 Termination Unit
NIDI01 Termination Module
NKTU01 Cable, Termination Unit
NKTU02 Cable, Termination Module
NKTM01 Cable, Termination Module
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INTRODUCTION
SPECIFICATIONS
I-E96-303A 1 - 5
SPECIFICATIONS
REFERENCE DOCUMENTS
Power Requirements
Voltage
Current Consumption
Power Dissipation
+5 VDC ±5%
+15 VDC ±5%
-15 VDC ±5%
+24 VDC ±10% (from termination unit/termination module)
480 mA (+5 VDC)
200 mA (+15 VDC)
195 mA (-15 VDC)
310 mA (+24 VDC)
3.75 watts @ +5 VDC
5.25 watts @ +15 VDC
3.75 watts @ -15 VDC
D/A Resolution 10 bits for analog outputs
Output Accuracy ≤0.15% (voltage mode)
≤0.25% (current mode)
Output Load 750 ohms maximum (current mode)
22 kilohms minimum (voltage mode)
Current Limiting
Short Circuit Protection 50 mA (nominal) output current limit
Surge Protection Meets IEEE-472-1974 Surge Withstand Capability Test1
Mounting Occupies one slot in standard INFI 90 Module Mounting Unit.
Environmental
Ambient Temperature
Relative Humidity
Altitude
Air Quality
0oto 70oC (32oto 158oF)
0% to 95% up to 55oC (131oF)(non-condensing)
0% to 45% at 70oC (158oF)(non-condensing)
Sea Level to 3 Km (1.86 miles)
Non-corrosive
Certification CSA certified for use as process control equipment in an ordinary
(non-hazardous) location.
NOTE: 1. Do not use the NKTM01 cable when compliance with IEEE-472-1974 is necessary.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Document
Number Description
I-E92-501-2 Configuration and Tuning Terminal
I-E93-916 Engineering Work Station
I-E96-100 Operator Interface Station
I-E96-200 Function Code Application Manual
I-E96-201 Multi-Function Processor (IMMFP01)
I-E96-202 Multi-Function Processor (IMMFP02)
I-E96-410 Digital I/O Termination Module (NIDI01)
I-E96-424 Digital I/O Termination Module (NTDI01)
I-E96-303A1 31 March 1993
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INTRODUCTION
I-E96-303A 2 - 1
SECTION 2 - DESCRIPTION AND OPERATION
INTRODUCTION
This section explains the output circuitry, control logic, data,
logic power and connections for the Analog Slave Output (ASO)
module. The ASO is an analog signal interface between a
Multi-Function Processor (MFP) or Multi-Function Controller
(MFC) module and process field devices. A master module com-
municates with its slave module on a 12-line slave expander
bus as shown in Figure 1-1. Each slave on the bus has a
unique address set by its slave address dipswitch (S1).
Analog output signals are either 1 to 5 VDC or 4 to 20 mA. The
process requirements determine the output mode (current or
voltage). These signals, sent to the process, control field
devices.
MODULE BLOCK DIAGRAM
The ASO circuits control the fourteen analog outputs, and
transmit slave operating status back to an MFP module. Figure
2-1 is a block diagram of the ASO module. It illustrates signal
flow through the module. Figure 2-2 shows the analog output
circuit.
Analog Output Circuits
The analog output block consists of fourteen separate output
circuits that develop the analog outputs. They are closed loop
current/voltage output circuits that monitor and adjust the
output as compared to the sample/hold (S/H) output demand.
Figure 2-1. Analog Slave Output Module Block Diagram
SLAVE EXPANDER
BUS
LOGIC POWER
ANALOG
OUTPUTS (14)
TP27154A
A/D
CONVERTER FEEDBACK SELECT
REFERENCE
MODULE
STATUS
D/A
CONVERTER SAMPLE/ HOLD
SAMPLE/
HOLD
SELECT
ANALOG
OUTPUT
P2
P3
P1
MODULE
STATUS LED
D/A
REGISTER
MODULE
MEMORY
CONTROL
LOGIC
SLAVE
EXPANDER BUS
INTERFACE
BUS FAULT
DETECTOR
18
OPEN
S1
OPEN
S2-S15
132
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DESCRIPTION AND OPERATION
MODULE BLOCK DIAGRAM
2 - 2 I-E96-303A
®
This compensates for supply voltage variation and unknown
load impedance. All outputs automatically go to 0 percent (1
VDC or 4 mA) at start-up.
Output mode is selectable for each output channel: current (4
to 20 mA) or voltage (1 to 5 VDC). Switches S2 through S15
select the mode for channels 1 through 14 respectively. Refer
to Section 3 for switch settings. A current limiter in each out-
put circuit provides short circuit protection. For a short condi-
tion, it limits the output current to 50 mA.
Control Logic
The module memory block is a Dual Port RAM (DPRAM) that
acts as a buffer between the MFP and the analog output chan-
nels. An MFP writes output and default values to the DPRAM
for each of the output channels through the slave expander
bus interface. Two sided (dual port) operation allows the MFP
module and ASO circuits to access the DPRAM simulta-
neously. The MFP is given priority when it and the ASO
attempt to access the same memory location.
Programmable Array Logic (PAL) circuits in the control logic
block provide module control for both normal and default oper-
ation. These circuits cycle through the DPRAM, write output
data (analog count) to the D/A converter and select the S/H
circuits. They also monitor the bus fault (time-out) signal to
Figure 2-2. Analog Output Circuit
–15 V
TP27146A
FROM SAMPLE/
HOLD CIRCUITS
FIELD
OUTPUT
FEEDBACK
–
+
+24 V
+15V
–15 V
–
+
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DESCRIPTION AND OPERATION
MODULE BLOCK DIAGRAM
I-E96-303A 2 - 3
determine when the default states should be used. Refer to
BUS FAULT TIMER in this section for further explanation of
time-out. The PAL cycles the DPRAM and the S/H circuits
through each output channel. It selects only one output chan-
nel and its corresponding S/H circuit at a time.
Output Logic
Defining Function Code (FC) 149 in the MFP configuration
establishes the output values; this function code defines only
seven outputs. Two function blocks must be linked, using
specification 2 (FC 149), to define all fourteen outputs. The
MFP sends an analog count value to the ASO for each of the
analog outputs. These counts are determined by FC 149.
The ASO sets each output based on its analog count (digital
value); the D/A converter changes this count to an analog sig-
nal that it sends to the S/H block. An analog count from the
DPRAM is held in the D/A register until the D/A converter is
ready for it. The S/H select block is a multiplexer that selects
the appropriate S/H circuit. The selected circuit corresponds
to the current output channel; the output channel and S/H
circuit selection are controlled by the PAL. S/H circuits sample
the analog signal and hold its value while the PAL sequences
through the rest of the channels. During normal operation,
this sequence repeats continuously for each of the output
channels.
Readback Logic
The feedback select block is a multiplexer that selects one of
the output feedback signals or the reference voltages. An A/D
converter changes these signals to analog count values the
MFP reads through the slave expander bus interface. Each
channel is read separately. These values allow the MFP to
adjust the outputs and check for output circuit failures. It does
this by comparing the values against the data written to each
output. Reading the reference voltage count values allows the
MFP to check A/D converter operation.
Default Operation
Atime-out condition causes the ASO module to go to default
operation. The PAL puts the module into default operation when
it receives a bus fault signal from the slave expander bus inter-
face. Each output goes to its default state (0 percent, 100 per-
cent or hold); FC 149 (specifications 11 through 17) define each
output default state. This FC defines only seven channels; two
function blocks must be linked to define all fourteen channels.
The PAL reads default data from the DPRAM to control the out-
put data that is sent to the D/A converter during a bus stall
(time-out) condition. A 0 percent option causes the D/A register
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DESCRIPTION AND OPERATION
OUTPUT CIRCUIT CONNECTIONS
2 - 4 I-E96-303A
®
to clear and output all zeros to the converter; this causes the
outputs to go to 0 percent (1 VDC or 4 mA). A 100 percent
option causes the D/A register to output all ones; this causes
the outputs to go to 100 percent (5 VDC or 20 mA). If a hold
option is selected, the ASO module uses the last value stored in
memory. It updates the outputs with the last value to keep
them at their current states (hold).
OUTPUT CIRCUIT CONNECTIONS
The output signals connect to the 30-pin card edge connector
P3 of the ASO using a termination cable from a TU/TM. P3 also
supplies +24 VDC power to operate the analog output circuits.
SLAVE EXPANDER BUS
The INFI 90 slave expander bus is a high speed synchronous
parallel bus. It provides a communication path between master
modules and slave modules. The master module provides the
control functions and the slave module provides the I/O func-
tions. The P2 card edge connector of the slave and master mod-
ule connect to the bus.
The slave expander bus is twelve parallel signal lines located
on the Module Mounting Unit (MMU) backplane. A 12-position
dipshunt placed in a connection socket on the MMU backplane
connects the bus between the master and slave modules. Cable
assemblies can extend the bus to up to six MMUs.
A master module and its slaves form an individual subsystem
within a Process Control Unit (PCU). The slave expander bus
between master/slave subsystems must be separated. Leaving
a dipshunt socket empty or not connecting the MMUs with
cables separates them.
UNIVERSAL SLAVE EXPANDER BUS INTERFACE
The ASO uses a custom gate array to perform the slave
expander bus interface function. All the control logic and com-
munication protocol are built into an integrated circuit (IC).
This IC 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.
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DESCRIPTION AND OPERATION
MODULE DATA
I-E96-303A 2 - 5
MODULE DATA
FC 149 in the master module configuration accesses the ASO
on the slave expander bus. Specifically, it allows the MFP to
automatically read status data and readback data from the
slave module, and write output data to it. FC 149 defines only
seven outputs; two function blocks must be linked together
(specification 2) to define all fourteen outputs. The slave
address in FC 149 must be the same as the address set on the
slave address dipswitch (S1).
Status Data
Status data is one 8-bit byte consisting of module identification
and status information. Slave module identification is in the
four most significant bits (MSB). It identifies the slave module,
and verifies the slave expander bus communication integrity
and MFP configuration.
Also included in the status byte is information concerning the
slave operating status. The MFP uses this information to deter-
mine if the slave has been removed and reinserted or powered
down or has ever had data written to it. A remove/reinsert or
power down clears default information from the slave memory.
If the status byte reflects any of these conditions, the MFP
downloads the information needed for default operation. The
LED state is read back to the MFP in the status byte to verify
proper indication.
Readback Data
This data consists of analog output readback values that the
MFP reads to verify ASO module operation. The A/D converter
changes analog output feedback signals from each output and
the reference voltages (1 VDC and 5 VDC) to analog count val-
ues. The MFP reads each of these count values once every exe-
cution cycle. It reads the fourteen readback values to allow
adjustment of the analog outputs and to check for output cir-
cuit failures. It reads the reference voltages to calibrate and
verify A/D converter operation.
Output Data
Output data is a 2-byte value consisting of an analog output
count and default values. The MFP writes this data to the
DPRAM each execution cycle for each of the fourteen outputs.
The count sets the analog outputs during normal operation.
Default values are sent to the PAL to set the outputs during a
time-out; the default values are selected in the MFP configura-
tion (Function Code 149).
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