Omega OMP-MODL User Manual

OM-MODL

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1... INTRODUCTION

1... INTRODUCTION

MANUAL OVERVIEW

This User’s manual provides information relative to the use of the OMP-MODL
Portable Data Logging Systems manufactured by Omega Engineering. The manual
is organized into sections describing the main components of a OMP-MODL system,
from the System Base through the various features within the provided software.
The last section of the manual consists of the Appendices which give detailed
specifications and information for general reference and advanced applications.

After following the instructions for the installation of the HyperWare software, much
can be learned by exploring this manual, the software and the hardware in any
order... without concern for damaging results. However, it is HIGHLY

RECOMMENDED that this User’s manual be read in its entirety before deploying the
OMP-MODL in a real application.

A note on the keyboard / mouse convention used within this manual... Throughout
the manual, instructions on PC keyboard entry or menu selections via mouse are
specified by using italic print such as ENTER which refers to the `Enter’ Key on the
keyboard or FILE which refers to the menu item titled `FILE’.

OMP-MODL SYSTEM: `THE BIG PICTURE’

The OMP-MODL is a battery powered portable data logging and control system. It
can be left at a site to collect data from various analog and digital signal or sensor
inputs. This data is mathematically processed by the OMP-MODL and stored in its
internal memory while simultaneously performing basic onsite alarm functions. The
collected data is then transferred to a PC running the supplied HyperWare software
for data plotting, real-time trending and analysis.

OMP-MNL VS OMP-MODL

The OMP-MNL is a special fixed functionality model of the OMP-MODL family. The
OMP-MNL offers the same functionality as the basic OMP-MODL with the exception
that it cannot be expanded with the addition of Interface Modules.

Throughout this manual, references made to the OMP-MODL generally refer to the
OMP-MNL and the OMP-MODL except where noted.

OMP-MODL SYSTEM COMPONENTS

A OMP-MODL portable data logging system consists of a number of components...
both hardware and software.

The main components are listed below and details follow:

♦ OMP-MODL System Base
♦ Interface Modules
♦ HyperWare™ , Windows based software
♦ Options such as modems, PCMCIA, etc

USING THE OMP-MODL

1-1

1... INTRODUCTION

BOTTOM PLATE/HANGER

OMP-MODL System Base

The OMP-MODL System Base refers to the main data logger unit composed
of a stack of two interconnected modules... the MLCPU-1 module and the
MLAD-1 module. These two modules combined house the main
microprocessor and support circuitry, memory, power supplies, A to D
converter as well as 6 inputs (4 analog, 1 Cold Junction Compensation

ML-TOP
TOP PLATE

MLADC-1

MLCPU-1

ML-BACK

ML001

Figure 1... -1: OMP-MODL System Base w/ top and bottom

temperature and 1 digital) and 4 outputs. The System Base can be used
stand-alone as a 6 input / 4 output data logger (OMP-MNL) or expanded with
the addition of Interface Modules, battery packs, and/or display modules.
The System Base includes a connector bus that provides signal connections
to the added Interface Modules.

Interface Modules

Interface Modules (See Figure 1... -2) are add-on layers that provide the
interface to various types of inputs and output signals. The Interface
Modules can be User installed onto the System Base then configured for the
specific type of signal or sensor to be connected to the OMP-MODL.
Interface Modules are configured via software and/or switch settings on the
modules.

1-2

USING THE OMP-MODL

1... INTRODUCTION

A family of Interface Modules is available for interface to various input signal
types such as thermocouples, RTD’s, voltage, current, frequency, event, etc.
Additionally, Interface Modules are available with outputs for digital alarm
and basic ON/OFF control functions.

Note that the OMP-MNL model does not support installation of additional
Interface Modules.

Configuration Switches

Inter-Module Connection bus

Side Retaining Screw holes

Figure 1... -2; Interface Module

I/O Wiring Terminal
Strip

HyperWare™ Software

Utilized with the OMP-MODL is a powerful Windows based software
package called HyperWare. HyperWare, running on an IBM compatible PC
under the Microsoft Windows environment provides a multitude of functions
for setup of the OMP-MODL as well as analysis of collected data including:

♦ Serial Communications support between the PC and the

OMP-MODL for RS-232 and telephone modem links
(OMP-MNL does not support modem comm)

♦ Programming of the OMP-MODL using the powerful

HyperNet™ visual icon based programming method

♦ Multi-channel, graphic data display of previously

collected data using HyperPlot™

♦ Screen captures of HyperPlot graphs for seamless

integration into other Windows based software
applications such as wordprocessors, spreadsheets, or
desk-top publishing packages

♦ Conversion of collected data files to ASCII text or

Microsoft Excel file formats

USING THE OMP-MODL

1-3

1... INTRODUCTION

Additional Components

Special function modules are also available to provide:

♦ Powerful mathematical data manipulation of collected

data during conversion to HyperPlot graphs, ASCII text
files and Excel files

♦ HyperTrack™ real-time graphic and numeric data

display of OMP-MODL inputs and HyperNet nodes

Telephone Modem Interface - plug-in modules that contain integral
low power 2400 Baud or 14.4 Kbaud telephone modems. These
modules allow for direct connection to standard telephone lines for
data transfer, reprogramming, and control...all from a remote PC
running HyperWare (not supported by OMP-MNL model) .

PCMCIA Memory Card Interface - plug-in module provides a
socket and interface circuitry for removable PCMCIA memory card
support. When utilized, the OMP-MODL stores data to the credit
card sized PCMCIA card. At any time, the card can be unplugged
from its socket and carried or shipped to a another site where the
data can be downloaded to a PC. Advantages of the PCMCIA card
include massive data storage capability, easily transportable data,
field data collection by non-technical staff, and reprogramming of
field units via card.

Battery Pack - add-on module containing 6 alkaline D-Cell batteries
for installations without power.

Front Panel Display and User Switch module - plug-on module
provides a faceplate with 2-line LCD, full set of User switches and
Status indicators.

Special Serial Communications Interface - a variety of special
serial communication types and protocols are available for serial
signal interface. Contact Omega Engineering about your specific
application requirement.

1-4

USING THE OMP-MODL

1... INTRODUCTION

FEATURES

Designed with the User in mind, the OMP-MODL portable data logging system has a
multitude of integral features ranging from special hardware considerations to
unlimited software programmability and data review. Capabilities include:

♦ Up to 24 channels of analog input or 40+ digital input/outputs.
♦ Configurable Interface Modules accept a multitude of signal types and ranges all

on a single module.

♦ Low power design allows for field logging up to 3 weeks from a set of commonly

available D-Cells.

♦ Pluggable I/O wiring Terminal Strips facilitate quick connect and disconnect of

the sensor and signal wiring harness.

♦ Four integral alarm outputs including two relays
♦ True Microsoft Windows based HyperWare software.
♦ Powerful HyperPlot graphic data display software with seamless integration of

plotted data into other Windows applications.

♦ HyperNet visual icon based programming provides unlimited flexibility in

programming, yet maintains simplicity with drag and drop icon configuration. Set
the OMP-MODL up without writing cryptic lines of code nor experiencing the
rigors of excruciating two button menu tree nightmares.

♦ Intelligent logging methodologies include logging only upon change of an input

(Delta-Logging), Conditional logging based on input levels, Conditional logging
based on time of day or elapsed time, dual speed logging initiated by User
programmed conditions, and more.

♦ Real-Time data display (on optional liquid crystal display) of User defined node

points... ranging from raw input signals to intermediate processed data to data
logged to memory.

♦ User defined alarm messages
♦ Pager call-out upon User defined alarm conditions

(Note: OMP-MNL has limited capabilities from above listing)

USING THE OMP-MODL

1-5

1... INTRODUCTION

SUMMARY OF STEPS IN UTILIZING THE OMP-MODL

In a typical application of the OMP-MODL portable data logging system, the
following sequence of steps would be involved. Details of each step are presented
in later sections of this manual.

1. Install the required Interface Modules into the OMP-MODL
System Base. Configure Interface Module hardware switches if
applicable (eg enabling a front end divider for the +/-30VDC
range on the HLIM-1)

2. Connect a serial cable link between the OMP-MODL and your
PC. Launch HyperWare and establish the connection.
HyperWare will automatically configure for the detected logger
model (OMP-MNL, OMP-MODL, or HyperLogger). Then change
to the HyperNet Development Screen.

3. Query the OMP-MODL for its current hardware configuration by
clicking the NEW button.

4. Construct a Program Net for this logging session by dragging
and dropping icons onto the HyperNet screen, then connecting
signals between the icons. Save the Program Net to disk and
print out a Terminal Strip Adapter wiring diagram for field
reference.

5. Transfer the Program Net to OMP-MODL memory via the serial
link and disconnect the serial link.

6. Install the OMP-MODL at the site and make the appropriate
wiring connections to the I/O Terminal Strips and modem (if
used).

7. Enable the OMP-MODL, then as a quick pre-departure check,
check readings at various pre-programmed Program Net nodes
using the Next and Select buttons while viewing the OMP-MODL
display.

8. Leave the OMP-MODL to collect data.

9. Later, connect up to the OMP-MODL via a serial link (RS-232 or
modem) or retrieve the PCMCIA memory card and from within
HyperWare, download the OMP-MODL memory to a file on the
PC.

10. For a fast and immediate review of the collected data, double­click on the data icon and HyperPlot will automatically load and
graphically display the collected data.

11. Save the desired HyperPlot graphic view as a Windows Bitmap
file , then switch to your Windows based wordprocessor and
seamlessly insert the saved graphic into your test report.

12. Optionally, use the HyperWare Post-Processing capability to
configure a special data reduction/ conversion icon network.
Then run the collected data file through the post processor and
generate a text file, Excel Spreadsheet file or another HyperPlot
file.

1-6

USING THE OMP-MODL

13.

1... INTRODUCTION

USING THE MODULOGGER

1-7

2... OMP-MODL System Base

BOTTOM PLATE/HANGER

2... OMP-MODL SYSTEM BASE

SYSTEM BASE OVERVIEW

System Base refers to the main data logger unit composed of a stack of two
interconnected modules... the MLCPU-1 module and the MLAD-1 module. These
two modules combined house the main microprocessor and support circuitry,
memory, power supplies, A to D converter as well as 6 inputs (4 analog, 1 Cold
Junction Compensation temperature and 1 digital) and 4 outputs. The System Base
can be used stand-alone as a 6 input / 4 output data logger (i.e. the OMP-MNL) or
expanded with the addition of Interface Modules, battery packs, and/or display
modules in the case of the OMP-MODL model. Additional modules are covered in
the following chapter.

The System Base includes a connector bus that provides signal connections to any
added Interface Modules.

ML-TOP
TOP PLATE

MLADC-1

MLCPU-1

ML-BACK

ML001

Figure 2... -1: System Base Assembly

ENCLOSURE / MOUNTING

The OMP-MODL (Figure 2... -1) is built up by plugging together a combination of
modular layers. A top plate (or display module ML-DISP) is then fastened to the top
and a bottom plate/hanger is fastened to the bottom of the stack to complete the

Using the OMP-MODL

2-1

2... OMP-MODL System Base

unit. As modules are added to the stack, the connectors must be aligned and
plugged together as the modules slide together. Four side retaining screws are then
installed into the sides to securely hold the assembly together.

Top Plate

A flat metal plate is provided to cover the top end of the module stack in
units not equipped with the ML-DISP Display and User button module (Refer
to the ML-DISP module in Chapter 3). The top plate fits into a recess at the
top of the unit and is fastened in place with 4 screws.

Bottom Plate / Mounting

A bottom plate is provided to cover the bottom end of the module stack as
well as provide means to mount the logger to a surface. Additionally, in
systems utilizing the Battery Pack (P/N: ML-BATT) the bottom plate is an
integral part of the Battery Pack and holds the batteries as well. The ML­BATT is described in Chapter 3.

KEYHOLE SLOTS

ANCHOR
SCREWS

ML003

Figure 2... -2: Bottom Plate / Hanger

Mounting is done by fastening the unit to a surface with round head screws
through the keyhole slots and optionally locking the unit in place with the
addition of another anchor screw (Figure 2... -2)

To mount the unit, remove the bottom plate from the logger by removing the
4 side retaining screws in the side of the plate, then use the plate as a
template to mark the screw hole locations. The bottom plate can then be
mounted on the screws. If desired, 2 locking screws can be added in the
bottom holes to securely hold the logger and prevent it from being slid up
and off of the keyhole screws.

Slip the logger back into the bottom plate and install the 4 side screws.

2-2

Using the OMP-MODL

TIP: For applications utilizing loggers equipped with a large number of
Interface Modules, the stack can become rather tall. In these
applications, side plate mounting may be desired. Contact LBI for
details on the side mounting bracket..

MLCPU-1 MODULE

Overview

RELAY 2

RELAY 1
STATUS
FEEDBACK

2... OMP-MODL System Base

EXTERNAL POWER
RELAY R1
RELAY R2
+5V
TTL
GND

1 2 3 4 5 6 7 8 9

STOP

RESET
ENABLE

POWER

SERIAL PORT

Figure 2... -3: MLCPU-1 Module (end view)

The MLCPU-1 module contains the microprocessor, memory, power
supplies, GPDI input circuitry, alarm output circuitry, User push buttons and
status indicators. Various components in this module are identified in Figure

2... -3. This module is required in all OMP-MODL systems.

User Interface Indicators and Buttons

An array of LED indicators and buttons are available at one end of the
MLCPU-1. Identification and function follows:

Main Power Switch:

A small recessed toggle switch controls the power to the logger.
Using a pencil or other small object, flip the switch side to side to
turn power ON/OFF. Upon turning power ON, after a short delay,
the Feedback LED (see following) will blink 5 times indicating that
the unit has sequenced through a power-up reset and is operative,
ready to accept commands.

Using the OMP-MODL

2-3

2... OMP-MODL System Base

Feedback LED Indicator:

The green Feedback LED is used to provide feedback to the User as
buttons are pressed and the logger performs various commands.
These responses include:

Command Feedback LED Response

Enable Unit 2 blinks
Stop Unit 2 blinks
Power-Up Reset 5 blinks
Two Button Reset 5 blinks
System Initialization (3 button) 10 blinks
Memory Clear ON continuously for 10

Executing Program Net 1 blink every 10 seconds

Status LED Indicator:

The green STATUS LED is merely a visual indicator provided for
User specified application from within a Program Net. This LED can
be programmed by the User to indicate Alarms and other operational
feedback.

seconds then OFF

Alarm LED Indicators (2):

The ALARM LED’s labeled R1 and R2, provide visual indication of
the state of the two programmable operation output relays included
in the MLCPU-1. When an ALARM LED is ON, the relay contacts
are closed.

ENABLE Button:

Pressing the ENABLE button initiates the execution of the current
Program Net residing in OMP-MODL memory. Upon press of the
ENABLE button, the Feedback LED (see following) will blink 2 times
indicating acknowledgement of the command. If the logger is
equipped with the ML-DISP module, the the LCD will change to
display ENABLED on the second line.

If the Feedback LED does not blink twice in response to a press, the
unit may already be Enabled or may have been previously running
in the Rotary Memory Mode.

Note that operation of the ENABLE button may be inhibited if the
logger is programmed with in the Rotary Memory Logging mode.
In this mode, only one logging session can be logged. To initiate
another, the first session must be cleared from memory. This
parameter is set within the Global icon during construction of a
Program Net. Refer to the Master Icon Reference Appendix for
details on the Global icon.

While enabled and executing a Program Net, the Feedback LED will
blink every 10 seconds indicating operation.

2-4

Using the OMP-MODL

2... OMP-MODL System Base

FYI: The label ENABLE was chosen rather than START for a subtle but
important reason. When the ENABLE button is pressed, execution of the
Program Net commences... but that does not necessarily mean that data
logging to memory has started.

For example, a Program Net is developed and uploaded to the OMP­MODL that includes a setpoint function that controls logging to memory.
For example log only when the kiln temperature exceeds 150F. Pressing
the ENABLE button merely causes the OMP-MODL to take readings of the
kiln temperature... but logging to memory STARTS when the temperature
rises above the 150F threshold.

STOP Button:

Pressing STOP at any time causes the OMP-MODL to finish
sequencing through the currently executing Program Net, then stop
executing. The Feedback LED will blink twice to indicate
acknowledgement of the command. If the logger is equipped with
the ML-DISP module, the LCD will change to display STOPPED on
the second line.

The STOP button can also be used to clear data that has been
logged to memory.

CLEARING MEMORY WITH THE STOP BUTTON:

To Clear data memory with the STOP button, press and hold the
STOP button. The Feedback LED will light continually for
approximately 10 seconds, then turn off. When the LED turns
off, memory has been cleared and the button can be released.

RESET Button:

A hardware reset of the OMP-MODL microprocessor can be
performed by depressing and releasing both the STOP and RESET
buttons at the same time. This normally should not be required but
in the event that a noise glitch or some other malfunction occurs,
this manual Reset capability is provided for a User to force a reset of
the microprocessor from the front panel.

After a Reset, the Feedback LED will blink 5 times indicating that a
the system has been reset. This Reset does not clear data memory
nor the Program Net currently residing in logger memory.

WATCH-DOG TIMER RESET

A special automatic reset circuit is incorporated into the System
Base to add additional reliability to the OMP-MODL system. This
circuitry, called a Watch-Dog Timer will force the OMP-MODL
microprocessor to reset and continue operation where it left off
(within 2 seconds) in the event that an unforseen hiccup or noise
glitch (for example, from a nearby lightning strike) causes the
microprocessor to lose its place or lock-up.

Although this circuit normally should not operate, it adds one
more level of robustness to the OMP-MODL for handling
unforeseen events.

Using the OMP-MODL

2-5

2... OMP-MODL System Base

3-Button System Initialization:

A complete initialization of the logger that will clear data memory
and program memory can be performed using the ENABLE, STOP
and RESET buttons. This sequence is normally only used when a
unit is upgraded in the field with a new EPROM or in the event that
the Program memory has become corrupted due to unforeseen
events such as disassembly while powered up, improper insertion of
a PCMCIA card, exposure to an extreme noise noise glitch (for
example, from a nearby lightning strike) that has caused the
microprocessor to lose its place or lock-up or other malfunction.

To perform this 3-Button Initialization,

1. Depress and hold the ENABLE button

2. Momentarily, depress the STOP and RESET buttons
simultaneously.

3. After a second or so, release the ENABLE button.

4. Observe the Feedback LED. After a few seconds, the
Feedback LED should blink 10 times in succession. This
indicates that a complete system initialization has been
performed.
If the logger is equipped with a ML-DISP modules, after a
short sequence of display messages on the LCD, a
SYSTEM INITIALIZED message should display
momentarily indicating that the logger was properly
initialized. If this message does not display, repeat the
procedure.

After initialization, reprogram the logger with a new Net Program
and the unit is ready to operate.

RS-232 Serial Communications Port

A female 6/6 RJ-12 modular phone type jack is provided on the MLCPU-1
for RS-232 communications. A mating 6 conductor cable (CAR-4) plugs into
this port. The other end of the cable plugs into the 9-pin or 25 pin serial port
on a PC via a modular plug to DB-9F (P/N: RJDB-9H) or DB-25F (P/N:
RJDB-25H) adapter. Note that this port is not for direct connection of a

telephone line.

2-6

Using the OMP-MODL

2... OMP-MODL System Base

CAUTION

The RS-232 jack is only for connection of RS-232

type signals (via the supplied cable and adapters)

and is not for direct connection of a telephone line.

For telephone modem communication with the OMP-

MODL, utilize the OMP-MODL Modem Interface

Module.

Direct connection of a telephone line to the RS-232

jack may result in permanent damage to the OMP-

MODL.

For longer communication distances, a longer cable can be used. Longer
cables can be purchased from Omega Engineering or from stores handling
standard phone supplies. If a cable is procured from a source other than
Omega Engineering, insure that the cable is 6 conductor and has the plugs
installed correctly. Refer to Appendix I for wiring details.

Although the RS-232 specification is only for communication distances up to
50’, communication with the OMP-MODL via RS-232 at Baud rates up to

19.2 Kbaud has been successfully achieved with 100’ of cable.
The OMP-MODL RS-232 communication circuitry powers up when a cable is

plugged into the port and a connection is established from within the
HyperWare Software. When the communication circuitry is powered up, an
additional load of approximately 30 mA is put on the logger power supply.

For this reason, when not communicating with the OMP-MODL and
operating from battery power, disconnect the connection from within
HyperWare and/or unplug the RS-232 cable. For extended communication
sessions battery life can be preserved by powering the OMP-MODL from an
external power supply.

TIP: For relative reference, with the communication
circuitry powered up, a new set of batteries will discharge
in approximately 3 days.

Using the OMP-MODL

2-7

2... OMP-MODL System Base

TTL ALARM OUTPUT

Terminal Strip Connections

The MLCPU-1 is provided with a terminal strip connector for connection of
power, input and output wiring (Figure 2... -4). The terminal strip connector
can be unplugged from the module allowing for quick disconnect and
reconnection of wiring. Connection details follow:

RELAY R2

RELAY R1
STATUS
FEEDBACK

EXTERNAL POWER
RELAY R1
RELAY R2
+5V

GND

1 2 3 4 5 6 7 8 9

STOP

RESET
ENABLE

POWER

SERIAL PORT

ML004

Figure 2... -4: MLCPU-1 Terminal Strip Connections (end view)

External Power (Terminals 1 & 2)

An external power source may be used to power the OMP-MODL .
If an external power supply is connected to the OMP-MODL and its
supply voltage is greater than approximately 10.7 VDC, the OMP­MODL will operate from the external supply and the batteries will not
be used. In the event that the external power fails or drops below

10.7V, the OMP-MODL will automatically transfer to battery power

and continue operation.
The External Power Supply terminals will accept either AC or DC

input and polarity is not relevant.

EXTERNAL SUPPLY VOLTAGE RANGE:

A field selectable dual input range feature allows the logger to
accomodate a very wide range of input voltage applied to the
External terminals. A jumper provided on the MLCPU-1
programs the input range for HI or LO range:

2-8

LO Range: (8 to 24 Vdc / 10 to 23 Vac) (factory default)
HI Range: (11 to 32 Vdc / 12 to 23 Vac)

Using the OMP-MODL

2... OMP-MODL System Base

To change the setting, access must be gained to the jumper on
the top of the MLCPU-1 module (Figure 2... -5). Per the
assembly / disassembly instructions in Chapter 3, open the
logger to gain access to the top of the MLCPU-1. The Hi/Lo
jumper is installed on two pins of a 3 pin header. To program a
new range, remove and reinstall the jumper on the desired pair of
pins.

CPU

EPROM

LOW RANGE

Figure 2... -5: MLCPU-1 External Power Voltage Range Jumper

OVERVOLTAGE PROTECTION:

The MLCPU-1 incorporates circuitry to protect the logger from
over-voltage, transient voltage spikes, and over-current
conditions encountered on the External Power Terminals. In the
event that extended out of spec voltages are impressed on the
External Power terminals, protective circuitry will activate and
blow the 1.5A input fuse. Replacement fuses (P/N: Littelfuse

27301.5) are available from Omega Engineering Incorporated or
electronic distributors.

BATTERY CONNECTION PIGTAIL:

The MLCPU-1 is equipped with a pigtail and connector for
connection to the ML-BATT battery pack module. This connector
dangles from the bottom side of the MLCPU-1 circuit board. If
batteries are not utilized, this pigtail should be left unconnected.
Details on connection and use are provided in the section on the
ML-BATT battery module in Chapter 3.

HIGH RANGE

ML005

Relay R1 (Terminals 3 & 4)

Wiring connections for Output Relay 1. The relay is a normally open
device with contacts rated for 500 ma MAX at 32VDC MAX .
Operation is dependent on logic associated with the Relay Alarm #1
icon within the Program Net executing in the logger.

Using the OMP-MODL

2-9

2... OMP-MODL System Base

Relay R2 (Terminals 5 & 6)

Wiring connections for Output Relay 2. The relay is a normally open
device with contacts rated for 500 ma MAX at 32VDC MAX.
Operation is dependent on logic associated with the Relay Alarm #2
icon within the Program Net executing in the logger.

+5V (Terminal 7)

This terminal provides a current limited, voltage regulated +5 VDC
supply for alarm and sensor excitation applications. The supply is
current limited to approximately 100mA and is short-circuit
protected. ON/OFF control of the output is dependent on logic
associated with the +5 Volt Out icon within the Program Net
executing in the logger.

Loads should be connected between Terminal 7 ( + ) and GND at
Terminal 9 ( - ).

TTL Alarm Output (Terminal 8)

A low current 5Vdc rated digital output is available from this terminal
under control from the Digital Alarm #1 icon within HyperNet. The
output swings from 0 to 5VDC relative to the GND terminal (terminal

9) and is intended for sourcing and sinking signal level loads only.

The output is current limited with an internal 4.3Kohm series resistor

2-10

Figure 2... -6: System Base Digital Output

(TTL) Current Sourcing Characteristics

which results in varying output voltage levels as a function of load or
sourced current as shown in Figure 2... -5. This Digital Output
provides sufficient current for control of the Omega Engineering
RPS-1, Rechargable Power Supply which can be used for powering/
exciting higher current sensors such as 4-20mA transmitters (see
Accessories in Appendix H).

GND (Terminal 9)

This terminal serves as a common or ground connection for the
Digital Outputs and for the +5V supply. It is connected directly to
the OMP-MODL circuit ground.

Using the OMP-MODL

2... OMP-MODL System Base

RTC / Memory Backup Battery

The OMP-MODL utilizes static ram for internal data storage which requires a
constant power supply to maintain its memory. Similarly, the Real Time
Clock (RTC) that keeps track of the date and time within the OMP-MODL
runs continually whether the main power switch is ON or OFF.

When the main power is ON, the memory and RTC draw their power from
the D-Cell batteries (or a connected external power supply). When the main
power is switched OFF, power for memory and the RTC automatically
switches to a small coin type lithium cell that is mounted on the main OMP­MODL circuit board (Figure 2... -7).

EXTERNAL POWER FUSE

LITHIUM CELL

EPROM

BATTERY PIGTAIL & CONNECTOR

ML006

Figure 2... -7: Memory and RTC lithium battery location (bottom of
MLCPU-1)

This cell will provide power for the RTC and memory for approximately one
year. Any time that the OMP-MODL main power is ON extends this lifetime.
At any time, the approximate state of charge of the lithium cell can be
displayed on the LCD under the SYSTEM STATUS / SUPPLY VOLTAGES
menu or from a serially connected PC running HyperWare and a Status
Query command. For lithium cell replacement procedure, refer to Appendix
D.

MLAD-1 MODULE

Overview

The MLAD-1 module contains the Analog to Digital converter, General
Purpose Digital Input channel circuitry, Cold Junction Compensation
circuitry, and four channels of analog input. This module plugs into the top
of the MLCPU-1 module (or MLIM-5 if so equipped) and is required in all
OMP-MODL systems.

Using the OMP-MODL

2-11

2... OMP-MODL System Base

A terminal strip is provided at one end of the module for the connection of
sensor and signal wiring. The terminal strip can be unplugged for mass
connect/disconnect of the field wiring. Connections are defined in Figure 2...

-8 and details on each of the functions follow.

CHGND

GPDI

-

+

17 18

EARTH GROUND

ML007

GND

A B C

-

+

1 2 3 4 5 6 7 8 9

SHIELD

GND

- +

+

+

INTERNAL CJC

EXTERNAL CJC

-

GND

GND

D

-

1110 12 13 14 15 16

CJC

Figure 2... -8: Terminal Strip connections (MLAD-1 Module, end view)

2-12

Four Channel Analog Input (terminals 1 through 12)

The MLAD-1 module provides four channels of analog input signal
conditioning identical to that provided by the MLIM-1 Module (Chapter 3).
Each of the four channels can be individually programmed for thermocouple,
DC Voltage and DC Current inputs. Hardware configuration switches are
provided on the MLAD-1 circuit board to configure the input channels for DC
current and medium or high level DC voltage inputs.

Refer to the MLIM-1 Module section in Chapter 3 for details on the input
configuration switches, wiring connections and applications of these inputs.

Cold Junction Compensation (terminals 13, 14, & 15)

Integral to the MLAD-1 is a cold junction compensation (CJC) sensor. This
sensor is a 10 Kohm @25C (Fenwall curve 16) thermistor which is located
by terminal strip header on the inside of the MLAD-1. The CJC sensor
senses the temperature of the terminal strips (Internal Mode) which in turn,
is used in the mV to temperature conversion equation required in
thermocouple measurements. Additionally, the CJC sensor can be used
within a Program Net to monitor the temperature inside the OMP-MODL
enclosure.

Using the OMP-MODL

2... OMP-MODL System Base

INTERNAL CJC SENSING APPLICATIONS:

For OMP-MODL applications with thermocouple inputs
connected directly to the MLAD-1 or any installed MLIM-1 Analog
Input modules, a wire jumper must be installed across terminals
13 and 14 (marked INT for internal). The OMP-MODL is shipped
from the factory with this jumper installed.

NOTE: If thermocouples are connected to the OMP­MODL on any channel, a wire jumper must be installed
across the CJC terminal strip terminals marked INT or
erroneous readings will occur..

EXTERNAL CJC SENSING APPLICATIONS:

If thermocouples are not being directly connected to the TSA (ie
CJC is not required), this CJC sensor channel can be used to
measure temperatures (or limited range resistance) outside of
the enclosure. A 10 Kohm thermistor (with the specified
resistance curve) or a resistance type sensor can be connected
across the terminals marked EXT on the CJC terminal strip.
Refer to the CJC Icon in Appendix A for additional details.

For external sensing applications, copper lug potted thermistors
with 10’ leads are available from Omega Engineering.

Chassis Ground (terminals 16)

A single terminal is provided on the MLAD-1 which connects to the internal
Chassis Ground circuit within the logger. In installations where sensor wiring
utilizes a Shield conductor connection to I/O module terminal strips (eg in
many MLIM-1 applications) a single conductor should be connected from
this terminal to a good earth ground to complete the shielding circuit.

General Purpose Digital Input (terminals 17 & 18)

Integral to the MLAD-1 is a single digital input channel that can be
configured under HyperNet as an Event or Counter input. The GPDI input
signal (either a contact closure or 0 to 15VDC max driven signal) is applied
across the two terminals observing polarity.

The operation of the GPDI is configured during construction of the Program
Net within HyperNet. Programming details and applications are described in
the Master Icon Reference in Appendix A.

Using the OMP-MODL

2-13

2... OMP-MODL System Base

NOTES:

2-14

Using the OMP-MODL

2... ModuLogger System Base

Using the ModuLogger

2-1

3... INTERFACE MODULES

3... INTERFACE MODULES

By adding Interface Modules (Figure 3... -1), the OMP-MODL System Base can be
expanded for additional I/O channels, modem, display, PCMCIA memory, and
battery operation. A full family of modules is available to meet most signal interface
and/or feature requirements.

This section covers the installation, wiring, hardware configuration, and application
considerations of the basic OMP-MODL family of Interface Modules. As additional
modules are added, the instruction sheets should be added to this section for
reference.

Programming and use of added Interface Module channels is done with the
HyperNet Program Net and is covered within Chapter 7 and the Master Icon
Reference in Appendix A.

I/O Wiring Terminal
Strip

Inter-Module Connection bus

Side Retaining Screw holes

Figure 3... -1: Interface Module

HANDLING

As with all electronic systems, static electricity discharge can weaken or cause
permanent damage to circuitry. Protective circuitry is integral to the OMP-MODL
system including the Interface Modules, however when the Interface Modules are not
installed in the System Base, the protective circuitry is not effective. Therefore,
when handling Interface Modules, it is recommended that reasonable static control
procedures be followed.

♦ Before touching the Interface Module, discharge static electricity

built up in your body be touching a grounded point such as a
water faucet, cover plate screw on a receptacle, metal surface
of a grounded appliance or other earth ground.

♦ Do not wrap or store the Interface Module in static generating

materials such as untreated styrofoam packing `peanuts’ or

USING THE OMP-MODL 3-1

3... INTERFACE MODULES

plastic bags. Anti-Static bags are available for storage of static
sensitive components.

INSTALLATION

When shipped, Interface Modules are provided with side screws and any necessary
accessories. If ordered with a logger, the Interface Modules are typically factory
installed in the System Base before shipment.

The Interface Modules stack onto the System Base building a `layered’ logger to
meet the User’s needs. All modules (except the ML-BATT Battery Pack) have an
inter-module connection bus that connects signals and power between the
modules(Figure 3... -1).

To add a module, perform the following steps and any special Installation
Instructions detailed in the following Interface Module specific sections.

1. Review the Interface Module instructions and observe any
special installation instructions. These may include setting
Module Address Switches and Input Configuration Switches.

2. Turn the OMP-MODL System Power switch OFF.

3. Determine the Port (layer) at which the new Interface Module is
to be installed. Refer to Figure 3... -4. Note that some modules
must be installed at a particular position (eg the MLIM-5 must be
installed between the MLCPU-1 and the MLAD-1 modules).

Also note that many modules require a Module address to
be programmed through the setting of one or more Module
Address Switches. This is covered in detail in the module
specific sections that follow.

4. Remove the four side retaining screws (Figure 3... -1) from the
enclosure nearest the joint into which the new module is to
added.

1. Carefully separate the layers while keeping them parallel (Figure

3... -2). Minimize the amount of twisting or rocking as this will
result in bent connector bus pins.

CORRECT MODULE SEPERATION

Figure 3... -2: Separating Modules without bending connector pins...

INCORRECT

2. After separation, examing the gold connector bus pins on the
Interface Module. These pins must be straight to insure proper

USING THE OMP-MODL3-2

ML011

3... INTERFACE MODULES

TTL ALARM OUTPUT

alignment and connection with the mating module. If any pins
are bent, straighten them with a small pliers.

3. Orient the Interface Module to be added so that the similar
length connector bus’s align and the terminal strips or other User
controls are all at the same end.

4. While peering into the gap between the modules, carefully
match up the connector pins on one module and the mating
socket on the other module and slide the two together. Examine
the connectors from different views as the modules come
together to insure that all of the pins are properly aligned.

5. Press the modules firmly together and reinstall the side access
screws to hold the modules together.

1. Turn the logger power ON and observe the Feedback LED
(Figure 3... -3) on the MLCPU-1 module. Within a few seconds,
the LED should blink 5 times indicating that a system reset has
been performed. This is also a fairly good indication that the
unit has been reassembled correctly.

EXTERNAL POWER

RELAY R2

RELAY R1
STATUS
FEEDBACK

1 2 3 4 5 6 7 8 9

RELAY R1
RELAY R2
+5V

GND

STOP

RESET
ENABLE

POWER

SERIAL PORT

ML004

Figure 3... -3: Feedback LED on MLCPU-1

Alternatively, if the logger is equipped with the ML-DISP
module, observe the LCD for normal operation and any error
messages afer switching the power ON.
If an indication of proper operation is not seen, repeat the
installation procedure, examining connector pins closely for bent
or misaligned pins.

USING THE OMP-MODL 3-3

3... INTERFACE MODULES

ML-DISP (Display and User Interface Module)
Must be mounted as Top Layer

Input / Output Module Layer
Module Position # 6

6

Input / Output Module Layer

5

Module Position # 5

Input / Output Module Layer

4

Module Position # 4

Input / Output Module Layer

3

Module Position # 3

Input / Output Module Layer

2

Module Position # 2

ML012

MLAD-1 Layer. Analog Inputs
fixed at Module Position # 1

1

MLIM-5 Layer (if installed)
Must layer between MLAD-1 and MLCPU-1

MLCPU-1 Layer. Fixed Position

ML-BATT Battery Pack. Connects
to bottom of MLCPU-1 module

Figure 3... -4: Layer / Module Address Reference

USING THE OMP-MODL3-4

3... INTERFACE MODULES

INTERFACE MODULE OPERATIONAL INSTRUCTIONS:

Each Interface Module has specific characteristics and instructions for set-up and
use that are unique to that particular module. These instructions are included in
following sections or provided with the Interface Module at the time of purchase. As
Interface Modules are added to a User’s OMP-MODL, the instruction sheets
provided should be added to this section of the manual.

The instructions for most Interface Modules include both hardware and software
details. Software instructions will commonly be referenced from other sections of
this manual such as in the chapter on HyperComm for the modem modules and the
chapter on HyperNet programming for analog and digital Interface Modules.

Instruction sheets for the following Interface Modules are currently included in this
section:

♦ ML-BATT; Battery Pack Module
♦ ML-DISP; Display and User Interface Module
♦ MLIM-1; Analog (thermocouple, Vdc and Adc Interface

Module (Configuration shared with MLAD-1 Module)

♦ MLIM-2; Event, Frequency, Count Interface Module
♦ MLIM-4; RTD, Thermistor, and Resistance Module
♦ MLIM-8; Digital Interface Module (8 channel digital I/O)
♦ MLIM-5 PCMCIA Memory Card Interface Module
♦ MLIM-5 PCMCIA Memory Card Interface Module with

2400B modem

♦ MLIM-5 PCMCIA Memory Card Interface Module with

14,400B modem

USING THE OMP-MODL 3-5

3... INTERFACE MODULES

NOTES:

USING THE OMP-MODL3-6