Omega Products OM-LMPLC Installation Manual

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

TEMPERATURE

Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies
Wire: Thermocouple, RTD & Thermistor
Calibrators & Ice Point References
Recorders, Controllers & Process Monitors
Infrared Pyrometers

PRESSURE, STRAIN AND FORCE

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HEATERS

Heating Cable
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ENVIRONMENTAL
MONITORING AND CONTROL

Metering & Control Instrumentation
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M3399/0699

OM-LMPLC - User’s Documentation - Omega

User’s Guide

http://www.dasieee.com

e-mail: [e-mail]

OM-LMPLC SERIES

PORTABLE PLC

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OM-LMPLC - User’s Documentation - Omega

OMEGAnet® On-Line Service Internet e-mail
http://www.omega.com [e-mail]

Servicing North America:

USA: One Omega Drive, Box 4047
ISO 9001 Certified Stamford, CT 06907-0047
Tel: [phone] FAX: [phone]
e-mail: [e-mail]
Canada: 976 Bergar
Laval (Quebec) H7L 5A1
Tel: [phone] FAX: [phone]
e-mail: [e-mail]

For immediate technical or application assistance:

USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGASM
Customer Service: 1-800-622-2378 / 1-800-622-BESTSM
Engineering Service: 1-800-872-9436 / 1-800-USA-WHENSM
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA
Mexico and
Latin America: Tel: [phone] FAX: [phone]
En Español: (95) 203-359-7803 e-mail: [e-mail]

Servicing Europe:

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands
Tel: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [e-mail]
Czech Republic: ul. Rude armady 1868, 733 01 Karvina-Hranice
Tel: [phone] FAX: [phone]
Toll Free: 0800-1-66342 e-mail: [e-mail]
France: 9, rue Denis Papin, 78190 Trappes
Tel: [phone] FAX: [phone]
Toll Free in France: 0800-4-06342

e-mail: [e-mail]
Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
Tel: [phone] FAX: [phone]
Toll Free in Germany: 0130 11 21 66
e-mail: [e-mail]
United Kingdom: One Omega Drive, River Bend Technology Centre
ISO 9002 Certified Northbank, Irlam, Manchester
M44 5EX, England
Tel: [phone] FAX: [phone]
Toll Free in the United Kingdom: 0800-488-488
e-mail: [e-mail]

__________________________________________________________________________________
_

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply.
OMEGA is constantly pursuing certification of its products to the European New Approach Directives.
OMEGA will add the CE mark to every appropriate device upon certification.

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OM-LMPLC - User’s Documentation - Omega

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc.
accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected
applications.

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from
date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to
cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an
Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be
defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the
purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or
unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of
having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification;
misapplication; misuse or other operating conditions outside of OMEGA’s control. Components which wear are not warranted,
including but not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any
omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information
provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be as specified and free of
defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT
THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are
exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification,
strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall
OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR
21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s)
be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes
no responsibility as set forth in our basic WARRANTY / DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and
hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS / INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S)
TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT
(IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package
and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS,
please have the following informatio n available BEFORE contacting
OMEGA:

1. Purchase Order number under which
the product was PURCHASED,

2. Model and serial number of the
product under warranty, and

3. Repair instructions and/or specific
problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest
in technology and engineering. OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or
reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair charges.
Have the following information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the
COST of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems
relative to the product.

Table of Contents

TABLE OF CONTENTS...............................................................................................................................................4

TABLE OF FIGURES ....................................................................................................................................................7

TABLE OF TABLES .....................................................................................................................................................7

TABLE OF EXAMPLES ...............................................................................................................................................7

SECTION I - GENERAL INFORMATION................................................................................................................9

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OM-LMPLC - User’s Documentation - Omega

INTRODUCTION...........................................................................................................................................................9

DESCRIPTION...............................................................................................................................................................9

DOCUMENTATION......................................................................................................................................................9

SAFETY CONSIDERATIONS........................................................................................................................................9

INSTRUMENT IDENTIFICATION...............................................................................................................................9

SECTION II - INSTALLATION................................................................................................................................10

INTRODUCTION.........................................................................................................................................................10

INITIAL INSPECTION ................................................................................................................................................10

POWER REQUIREMENTS..........................................................................................................................................10

BENCH OPERATION..................................................................................................................................................10

PANEL MOUNTING...................................................................................................................................................10

SOFTWARE INSTALLATION ....................................................................................................................................11

SECTION III - OPERATING INSTRUCTIONS .....................................................................................................12

INTRODUCTION.........................................................................................................................................................12

CONTROLS AND INDICATORS .................................................................................................................................12

CONNECTING INPUTS...............................................................................................................................................14

CONNECTING OUTPUTS..........................................................................................................................................15

PROGRAM, RUN, AND PAUSE MODES....................................................................................................................16

RESETTING THE COUNTERS AND PROCEDURE ...................................................................................................17

OM-LMPLC DISPLAYS.............................................................................................................................................17

PROGRAMMING OVERVIEW.....................................................................................................................................19

STEP COMMANDS.....................................................................................................................................................19

Overview...............................................................................................................................................................19

Turn Outputs “On/Off”......................................................................................................................................20

Turn Outputs “On” .............................................................................................................................................20

Turn Outputs “Off”.............................................................................................................................................21

Waiting for Inputs to be “On”..........................................................................................................................21

Waiting for Inputs to be “Off”..........................................................................................................................22

Wait.......................................................................................................................................................................22

End Test................................................................................................................................................................22

Pause Test............................................................................................................................................................22

Jump if Inputs are “On”....................................................................................................................................23

Jump if inputs are “Off”.....................................................................................................................................23

Increase counters................................................................................................................................................23

Count inputs........................................................................................................................................................24

Begin Loop...........................................................................................................................................................25

End Loop..............................................................................................................................................................26

Jump......................................................................................................................................................................26

PROCEDURE WRITER PROGRAMMING SO FTWARE .............................................................................................26

Starting Procedure Writer................................................................................................................................26

Creating a new procedure ................................................................................................................................27

Different Views of your procedure...................................................................................................................27

The Step view.......................................................................................................................................................27

The Sheet View....................................................................................................................................................28

The Output view..................................................................................................................................................29

Editing the custom displays..............................................................................................................................30

Custom Input, Output, and Counter names...................................................................................................31

Modifying onboard counts...............................................................................................................................32

Procedure Writer Options.................................................................................................................................32

Testing your Input and Output wiring............................................................................................................33

Debugging your Procedure..............................................................................................................................34

Printing your procedure...................................................................................................................................34

Documenting your procedure..........................................................................................................................34

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OM-LMPLC - User’s Documentation - Omega

Saving your procedure......................................................................................................................................35

Opening your procedure...................................................................................................................................35

Reading a Procedure from the OM-LMPLC ..................................................................................................35

Using the procedure Wizard.............................................................................................................................36

OM-LMPLC FIELD PROGRAMMER........................................................................................................................36

Downloading the OM-LMPLC field programmer software into the calculator.....................................37

ADVANCED PROGRAMMING TECHNIQUES ...........................................................................................................38

INTEGRATING THE OM-LMPLC IN A DATA ACQUISITION SYSTEM ..............................................................39

SECTION IV - PRINCIPLES OF OPERATION.....................................................................................................40

INTRODUCTION.........................................................................................................................................................40

STEP CYCLES.............................................................................................................................................................40

SOLID STATE RELAYS.............................................................................................................................................41

SECTION V - MAINTENANCE .................................................................................................................................42

INTRODUCTION.........................................................................................................................................................42

OUTPUT FAILURE .....................................................................................................................................................42

TROUBLESHOOTING.................................................................................................................................................42

SECTION VI - SUPPORT..........................................................................................................................................43

INTRODUCTION.........................................................................................................................................................43

INTERNET WEB SITE...............................................................................................................................................43

APPENDICES...............................................................................................................................................................44

SPECIFICATIONS .......................................................................................................................................................44

SERIAL CABLE WIRING............................................................................................................................................45

RS232 PROTOCOL SUMMARY..................................................................................................................................45

PROCEDURE WRITER - L ICENSE AGREEMENT ....................................................................................................47

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OM-LMPLC - User’s Documentation - Omega

Table of Figures

FIGURE 1 - OM-LMPLC FRONT PANEL .....................................................................................................................12

FIGURE 2 - REAR OF OM-LMPLC...............................................................................................................................13

FIGURE 3 - OM-LMPLC INPUT CIRCUIT ...................................................................................................................14

FIGURE 4 - TYPICAL OM-LMPLC INPUT WIRING...................................................................................................15

FIGURE 5 - OM-LMPLC OUTPUT CIRUIT FOR AC AND DC...................................................................................15

FIGURE 6 - TYPICAL OM-LMPLC DC OUTPUT WIRING ........................................................................................16

FIGURE 7 - TYPICAL OM-LMPLC AC OUTPUT WIRING........................................................................................16

FIGURE 8 - RESETTING PROCEDURES “COUNT DOWN” WARNING ON THE LCD DISPLAY..............................17

FIGURE 9 - RESETTING PROCE DURES WITH "PROCEDURE" RESET MESSAGE.....................................................17

FIGURE 10 - OUTPUT 2 ACTIVATED AND INPUT 1 ACTIVATED ..........................................................................18

FIGURE 11 - COUNTERS 1-2 DISPLAY .........................................................................................................................18

FIGURE 12 - PROCEDURE INFORMATION DISPLAY..................................................................................................18

FIGURE 13 - PROCEDURE WRITER STEP V IEW........................................................................................................28

FIGURE 14 - SHEET V IEW.............................................................................................................................................29

FIGURE 15 - OUTPUT V IEW.........................................................................................................................................30

FIGURE 16 - E NTERING CUSTOM DISPLAYS..............................................................................................................31

FIGURE 17 - NAMING INPUTS, OUTPUTS, AND COUNTERS....................................................................................31

FIGURE 18 - E DIT CURRENT COUNTS DIALOG..........................................................................................................32

FIGURE 19 - SELECTING A COMM PORT AND OTHER PROCEDURE WRITER OPTIONS.....................................33

FIGURE 20 - TESTING INPUT AND OUTPUT WIRING SCREEN ................................................................................34

FIGURE 21 - READ THE PROCEDURE OUT OF THE PLC TO PRINT IT OUT ..........................................................35

FIGURE 22 - THE MAIN TOOLBAR FOR THE FIELD PROGRAMMER IS ACCESSED THROUGH THE CST BUTTON

.................................................................................................................................................................................36

FIGURE 23 - THE OM-LMPLC FIELD PROGRAMMER ALLOWS PROGRAMMING WITHOUT THE PC................37

FIGURE 24 - SERIAL CABLE WIRING...........................................................................................................................45

Table of Tables

TABLE 1 - SUMMARY OF STEP COMMANDS.............................................................................................................20

TABLE 2 - OM-LMPLC TROUBLE SHOOTING...........................................................................................................42

Table of Examples

All examples are included on the Procedure Writer install disks. Their names are indicated by (filename) in
the following table.

EXAMPLE 1 - TURNING OUTPUTS ON AND OFF WITH THE "OUTPUTS ON/OFF" COMMAND

(EX_ONOFF.LM1)..................................................................................................................................................20

EXAMPLE 2 - RUNNING PARTS WHEN SE LECTED ONLY USING THE TURN OUTPUTS ON COMMAND

(EXTURNON.LM1).................................................................................................................................................21

EXAMPLE 3 - USING INPUTS TO MONIT OR TEST PROGRESS WITH THE WAIT INPUTS COMMAND

(EXWAITIN.LM1)..................................................................................................................................................22

EXAMPLE 4 - RUNNING TWO DIFFERENT TESTS WITH ONE PROCEDURE USING JUMPIF COMMAND

(EXJUMPIN.LM1)...................................................................................................................................................23

EXAMPLE 5 - USING COUNTERS TO TRACK CYCLES (EX_CNTR.LM1)..................................................................23

EXAMPLE 6 - COUNTING INPUTS DIRECTLY WITH THE "COUNT INPUTS" COMMAND (EX_CNTIN.LM1)...24
EXAMPLE 7 - USING "JUMP IF" COMMANDS FOR MORE ADVANCED INPUT COUNTING (EXTCNTIN2.LM1).25

EXAMPLE 8 - USING LOOPS TO CYCLE A SPECIFIC NUMBER OF TIMES (EXLOOP1.LM1)..................................25

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OM-LMPLC - User’s Documentation - Omega

EXAMPLE 9 - USING MULTIPLE LOOPS FOR HANDLING USER INSPECTIONS (EXLOOP2.LM1).........................26

EXAMPLE 10 - CREATING OR LOGIC WITH MULTIPLE JUMP STEPS....................................................................38

EXAMPLE 11 - IMPLEMENTING AND LOGIC WITH MULTIPLE JUMP STEPS......................................................39

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OM-LMPLC - User’s Documentation - Omega

Section I - General Information

Introduction

This section gives a general overview on the OM-LMPLC.

Description

The purpose of the OM-LMPLC is to function as a flexible I/O controller for test labs. In contras t with
widely available controllers, the OM-LMPLC was specifically designed for on/off cycling tests such as
pneumatic cycling, electronic power cycling, and other durability testing. Being tailored to the particular
niche market brings features not availa ble on current PLC's. Features usually required for testing such as
cycle counters, ease of use, computer control, and solid state relay outputs.

Documentation

The User’s Documentation is the comprehensive source for information concerning the OM -LMPLC. Use
the Table of Contents, Table of Figures, and Table of Tables to quickly locate the information you require.
Other sources of information include the Procedure Writer’s on-line documentation, the Omega WWW
(World Wide Web) site, and Omega’s Application notes.

Safety Considerations

Although the OM -LMPLC is a low voltage device, the OM-LMPLC could control potentially dangerous test
setups. The OM -LMPLC is not designed for controlling in situations where errors in the control logic could
cause human injury. Please use common sense in your use of the OM -LMPLC and apply standard safety
practices.

Qualified personnel should only perform wiring. Extreme care should be taken when working with dangerous
voltage levels.

When output errors could cause problems, for example if a Solid State Relay fails “On”, it is recommend that
the user installs a output disable circuit on each of the commons of the output connector. OM -LMPLC’s
output enable button on its front panel disables the outputs from the control side only, so if the Solid State
Relay fails “On” the output enable button will not have any affect.

Instrument Identification

On the rear of the OM-LMPLC is an identification number. This label clearly identifies the serial and model
number of the OM-LMPLC.

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OM-LMPLC - User’s Documentation - Omega

Section II - Installation

Introduction

This section shows how to get started using the OM -LMPLC. This includes initial components inspection,
mounting, installing the programming software, and configuring your PC’s communications port.

Initial Inspection

When you receive your OM-LMPLC, you should have the following:

• Power supply (or) power jack connector

• Serial cable

• Setup disks (2) for the Procedure Writer Software (included in this manual)

• OM-LMPLC

• OM-LMPLC User's Documentation

• Panel mount slides (or) rubber feet and handle

If you do not have any of the above, please contact Omega’s.

Power requirements

The OM-LMPLC comes with its own wall transformer DC power supply or a power jack connector
compatible with the input power connector on the OM-LMPLC. The power jack connector allows you to use
an alternative DC power source. Consult the Specifications in the appendices for information on power
requirements.

Bench Operation

The OM -LMPLC is suitable for bench top operation. However, care should be taken when using the OM­LMPLC for controlling dangerous AC voltages. It is recommended that you enclose the OM -LMPLC in a
protective case when working with AC voltages.

Panel Mounting

You can install the OM-LMPLC into a panel. In order to install the OM-LMPLC into a panel, you can use the
panel mount installation kit. Contact Omega’s for more information.

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OM-LMPLC - User’s Documentation - Omega

Software Installation

Use the two disks included with the OM-LMPLC to install the “Procedure Writer” software. The following
steps describe the installation process.

1. Insert the program disk into a floppy disk drive.

2. Choose “Run” from the file menu of Program Manager if you are using Windows 3.x. If you are using

Windows 95, press start and choose run.

3. Type the drive letter followed by a colon, slash ( \ ) and then “setup”. For example, if you placed the

disk into the “a” drive it would be “a: \setup.exe”

4. Press enter.

5. Follow the instructions as shown in the setup program. The setup will check to see if there is enough

space on your hard drive, install the software, and allow you to choose the directory for locating the
software.

Setting up a free Comm port

Most PCs, both laptop and desktop type, have two Comm ports. Many devices use Comm ports to get data
into and out of your PC. Two of the most prominent devices are mice and modems. Most desktop PCs have
a mouse connected to one of their Comm ports. Most Laptops have a mouse built in which does not use the
external Comm port connector. You must determine which Comm port is not in use. See Setting up a Comm
port on page 32 for more information.

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OM-LMPLC - User’s Documentation - Omega

Section III - Operating Instructions

Introduction

This section describes how to operate the OM-LMPLC. It includes information about the hardware, software
features, and the OM-LMPLC step commands.

Controls and Indicators

In order to simplify use and reduce cost, the OM -LMPLC’s front panel user interface is extremely simple.
The front panel of the OM -LMPLC has only two buttons, a key-switch, a connector, and a display (Figure

1). The rear panel has connections for the Inputs, Outputs, and the device power. All user interactions occur
through the front panel.

Figure 1 - OM -LMPLC front panel

The Mode push button is used to select the currently viewed display, to remove the OM -LMPLC from
“Pause Mode”, and to reset the procedure and internal counters. The operatio n of the “Mode” button is
defined in the “Program, Run, and Pause Modes” sub-section later in this section.

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OM-LMPLC - User’s Documentation - Omega

The key-switch selects the operational mode of the OM -LMPLC. The OM-LMPLC has three modes: Pause,
Run, and Programming Mode. The sub-section called “Program, Run, and Pause Modes” clearly defines the
interaction of the key-switch and the different modes.

The output enable push button controls the signal to the OM -LMPLC’s internal hardware output chip that
enables its outputs. The purpose for this switch is so you can quickly disable the outputs. For increased
safety, the output enable switch is independent of the Microprocessor control. When this switch is
depressed, it will show an orange dot. In this state, it will enable the Microprocessor to control the outputs.

Note: The "output enable" safety feature only disables the outputs from the control side. For example, if the
solid state relay failed on (Shorted) this switch would have no effect. For possible dangerous situations an
external shut of f relay should be added on the power side.

The serial connector is where you connect the serial cable with the PC. This is how the OM-LMPLC
communicates with the PC.

The back panel of the OM-LMPLC has the connectors for the outputs, inputs, and power (Figure 2).

Figure 2 - Rear of OM -LMPLC

The power connector is where the proper power source should be connected. This connector has positive
at its center and ground on the outside. Consult specifications for power requirements.

The OM -LMPLC output connector is a ten-position connector. It has two commons located at position 1
and 5. Outputs one through four share position 1 common and outputs four through eight share position 5.
For example connection diagrams see the “Connecting Outputs” sub section later in this section.

The OM -LMPLC input connector is a nine-position connector. Position 1 of the connector is a common to
all eight inputs. For more information on connecting inputs to the OM-LMPLC, see sub-section called
“Connecting Inputs” later in this section.

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OM-LMPLC - User’s Documentation - Omega

LEDs

DC

Voltage

DC
Sensor
Supply

Input (X)

Connecting Inputs

The inputs on the OM-LMPLC are bi -directional LED opto-isolators (Figure 3). You can use any DC voltage
source from 5 to 35 VDC to power the LED to complete the circuit. Wiring for dry contact switches and
transistor output type devices (such as proximity sensors and photo detectors) are shown in
Figure 4.

Input (X)

Input

Common

Figure 3 - OM -LMPLC Input Circuit

Dry Contact Switch

5-35 V

Common

Common

Input (X)

Transistor Output

5-35 V

Page 14 of 47

Sensor such as
Proximity Sensor
or Photo Detector

OM-LMPLC - User’s Documentation - Omega

-

Figure 4 - Typical OM -LMPLC Input Wiring

Connecting Outputs

The OM-LMPLC has a 10-position connector for outputs. Outputs are available for DC and AC. Typical
wiring for DC and AC connections is shown in
Figure 6 and Figure 7, respectively.

Output (X)

Crydom Solid
State Relay AC

Type (SCR or
Common (X)
C1=OUT 1-4
C2=OUT 5-8

TRIAC)

Output (X)

Common (X)
C1=OUT 1-4
C2=OUT 5-8

Figure 5 - OM -LMPLC output ciruit for AC and DC

Crydom Solid

State Relay DC

Type (Bipolar

Transistor) Note

polarity

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