Omron K3GN - V1.04 User manual

USER’S MANUAL
1/32 DIN Digital Panel Meter
K3GN
Cat. No. N102-E1-04

I
PREFACE
This User’s Manual provides you with information necessary
for use of the K3GN series of digital panel meters.
Please read this manual carefully to ensure correct and efficient use of the product.
Keep this manual handy for future reference.
General Precautions
If contemplating using the product in the following environments or for the following equipment,
first contact a sales representative of the company and then accept responsibility for incorporating
into the design fail-safe operation, redundancy, and other appropriate measures for ensuring
reliability and safety of the equipment and the overall system.
(1) Environments deviating from those specified in this manual
(2) Nuclear power control systems, traffic (rail car/automobile/aircraft) control systems, medical
equipment, amusement equipment, and rescue and security equipment
(3) Other equipment that demands high reliability, including those related to the safety of life and
property
About the Contents of the Manual
(1) Any reproduction, full or in part, of the manual is prohibited without prior written
permission from the company.
(2) Specifications in the manual may be subject to change without notice.
(3) Information in the manual has been carefully checked for accuracy. If finding any
suspicious or erroneous descriptions in the manual, however, you are kindly requested
to contact a branch office of the company. In such a case, please let us know the Cat.
No. shown on the front cover of the manual.

II
Other Informations
1 Warranty
(1) Warranty Period
The warranty period for an OMRON Product is one year from either the date of purchase or the date on which the
OMRON Product is delivered to the specified location.
(2) Extent of Warranty
If an OMRON Product is subject to a failure for which OMRON is responsible during the warranty period, either a
replacement product will be provided or the defective product will be repaired free of charge at the place of
purchase, This warranty, however, will not cover problems that occur as a result of any of the following.
a) Using the OMRON Product under conditions or in an environment not described in catalogs or in the
specifications, or not operating the OMRON Product according to the instructions contained in catalogs or
in the specifications.
b) Problems caused by something other than the OMRON Product.
c) Modifications or repairs performed by a party other than OMRON.
d) Using the OMRON Product for other than its designed purpose.
e) Problems that could not have been foreseen with the level of science and technology that existed at the time
the OMRON Product was shipped.
f) Problems caused by an Act of God or other circumstances for which OMRON is not responsible.
This warranty covers only the OMRON Product itself. It does not cover any other damages that may occur
directly as a result of a problem with the OMRON Product.

2 Limitations of Liability
(1) OMRON shall not be responsible for special, indirect, or consequential damages originating in an OMRON
Product.
(2) For programmable OMRON Products, OMRON does not accept responsibility for any programming that is
performed by a party than OMRON, or for any results arising from that programming.

3 Applicable Conditions
(1) When using OMRON Products in combination with other products, it is use’s responsibility to confirm
the suitability of the OMRON Products for the system, devices, and equipment that are being used. OMRON
accepts no responsibility for the suitability of OMRON Products used in combination with other products.
(2) When using OMRON Products in any of the following applications, consult an OMRON representative and check
specifications to allow sufficient leeway in ratings and performance, and to implement suitable safety measures,
such as safety circuits, to minimize danger in the event of an accident.
a) Outdoor applications, applications with potential for chemical contamination or electrical interference, or
application under conditions or environments not described in catalogs.
b) Nuclear control systems, railroad systems, aviation systems, vehicles, combustion systems, medical equipment,
amusement machines, or equipment regulated by government or Industrial standards.
c) Other systems, machines, and equipment that may have a serious influence on human life and property.
d) Equipment requiring a high level of reliability, such as gas, water, or electrical supply systems, and systems that
operate 24 hours a day.
e) Other applications requiring a high level of safety, corresponding to points a) to d), above.
(3) When OMRON Products are used in an application that could pose significant risk to human life or property, the
overall system must be designed so that the required safety can be ensured by providing notice of the danger and
incorporating redundancy into the design. Make sure that OMRON Products are appropriately wired and mounted to
serve their intended purpose in the overall system.
(4)Applicationexamplesprovided in catalogs are for reference only. Confirm functionality and safety before actually
using the devices and equipment.
(5) To prevent unexpected problems from arising due to the OMRON Product being used incorrectly by the customer
or any other party, make sure that you understand and carefully observe all of the relevant prohibitions and
precautions.

4 Changes to Specifications
Specifications and accessories to the products in catalogs may be changed as needed to improve the products or for any
other reason. Check with your OMRON representative for the actual specifications for OMRON Products at the time
of purchase.

5 Applicability
The above information assumes that business and product application will be conducted in Japan. For business and
application outside of Japan, consult with your OMRON representative.

III
Signal Words and Safety Notices
Signal Words
In this manual, safety notices are divided into WARNING and CAUTION according to the
hazard level.
As both of WARNING and CAUTION notices contain important information for ensuring
safety, be sure to observe them.
Symbols
CAUTION
A signal word indicating a potentially hazardous
situation which, if not avoided, may result in minor or
moderate injury or property damage.
Indicates a CAUTION or WARNING with the specific contents
indicated in the triangle and described in text. The example at the left is
for a general precaution.
Indicates a prohibition with the specific contents described in text,
which is general unless otherwise classified.
Indicates a prohibition with the specific contents indicated behind the
circle and slash and described in text. The example at the left is for
prohibiting disassembling.
Indicates a mandatory action with the specific contents indicated in the
circle and described in text. The example at the left is for a general
mandatory action that is not classified otherwise.

IV
Safety Notices
CAUTION
Do not touch the terminals while power is being supplied.
Doing so may possibly result in electric shock
Do not allow pieces of metal, wire clippings, or fine metallic shavings or
filings to enter the product.
Doing so may occasionally result in minor or moderate injury or in
property damage due to electric shock, fire, or malfunction caused by
internal short circulation..
Do not use the product in locations where flammable or explosive gases
are present. Doing so may occasionally result in minor or moderate
ex
p
losion
,
causin
g
minor or moderate in
j
ur
y,
or
p
ro
p
ert
y
dama
g
e.
Do not use the equipment for measurements within Measurement
Categories ⅡⅢor Ⅳ(according to IEC61010-1). Doing so may
occasionally cause unexpected operation, resulting in minor or moderate
injury, or damage to the equipment. Use the equipment for measurements
only within the Measurement Category for which the product is designed.
Failure to perform correct setting of the product according to the
application may occasionally cause unexpected operation, resulting in
minor or moderate injury, or damage to the equipment.
Ensure safety in the event of product failure by taking safety measures,
such as installing a separate monitoring system.
Ensure safety in the event of product failure by taking safety measures,
such as installing a separate monitoring system.
Product failure may occasionally prevent operation of comparative
outputs, resulting in damage to the connected facilities and equipment.
Tighten the screws on the terminal block and the connector locking
screws securely using a tightening torque within the following ranges.
Loose screws may occasionally cause fire, resulting in minor or moderate
injury, or damage to the equipment.
Terminal block screws : 0.43 to 0.58 N·m.
Connector locking screws :
Do not attempt to disassemble, repair, or modify the product. Doing so
may occasionally result in minor or moderate injury due to electric shock.

V
Precautions for Safe Use
Precautions for the environment.
(1) Do not use the product in the following locations.
• Locations subject to direct radiant heat from heating equipment
• Locations here the product may come into contact with water or oil
• Locations subject to direct sunlight
• Locations where dust or corrosive gases (in particular, sulfuric or ammonia gas) are
present
• Locations subject to extreme temperature changes
• Locations where icing or condensation may occur
• Locations subject to excessive shocks or vibration
(2) Do not use the product in locations subject to temperatures or humidity levels outside the
specified ranges or in locations prone to condensation. If the product is installed in a
panel, ensure that the temperature around the product (not the temperature around the
panel) does not go outside the specified range. Parts life is dependent on temperatures. A
part life shortens when the temperature rises, and it lengthens when the temperature falls.
Parts life can be lengthened by lowering the temperature inside the product.
(3) In order to prevent inductive noise, wire the lines connected to the product separately
from power lines carrying high voltages or currents. Do not wire in parallel with or in the
same cable as power lines. Other measures for reducing noise include running lines along
separate ducts and using shield lines.
(4) Do not install the product near devices generating strong high-frequency waves or surges.
When using a noise filter, check the voltage and current and install it as close to the
product as possible. If several products are mounted side-by-side or arranged in a vertical
line, the heat dissipation will cause the internal temperature of the product to rise,
shortening the service life. If necessary, cool the products using a fan or other cooling
method.
(5) Take care when cleaning the product, because the exterior of the product contains
organic solvent (thinner, benzine, etc.), strong alkaline material and strong acid material.
(6) Avoid storing in high humidity or in a corrosive gas environment (including during
transportation)
Precautions for Safe Use.
(1) Use and store within the proper temperature and humidity described in the specifications.
(2) Provide sufficient space around the product for heat dissipation.
(3) When using the product stored unused over a year after purchasing, the product features
may not be utilized sufficiently.
(4) Avoid storing outdoors and in a place that receives direct sunlight (including during
transportation).
(5) The service life of the output relays depends on the switching capacity and switching
conditions. Consider the actual application conditions and use the product within the
rated load and electrical service life. Using the product beyond its service life may result
in contact welding or burning.
(6) Be sure to confirm the name and polarity for each terminal before wiring the terminal
block and connectors. Faulty wiring causes destruction or burnout of internal parts.
(7) Use the product within the noted supply voltage and rated load.
(8) Do not connect anything to unused terminals.
(9) Output turns OFF when the mode is changed or settings are initialized. Take this into
consideration when setting up the control system.

VI
(10) Install an external switch or circuit breaker and label them clearly so that the operator can
quickly turn OFF the power.
(11) Ensure that the rated voltage is achieved no longer than 2 s after turning the power ON.
When applying a voltage gradually, power supply may not be reset or output functions
indeterminately.
(12) Mount to a panel between 1 and 5 mm thick.
(13) Use the specified size of crimp terminals (M3, width : 5.8 mm max.) for wiring. To
connect bare wires, use AWG 28 to AWG 16 to wire the power supply terminals and
AWG 22 to AWG 14 for other terminals. (Length of exposed wire : 6 to 8 mm)
(14) Allow the product to operate without load for at least 15 minutes after the power is
turned ON.

VII
Precautions for Correct Use
(1) Install the product horizontally. Display error has the risk of becoming larger than the standard because heat
cannot be radiated.
(2) When using a noise filter on the power supply, check that the filter is suitable for the supply voltage and
current ratings, and then attach the noise filter as close as possible to the K3GN.
<Examples of noise prevention schemes>
(3) If placed near the product, radios, TVs, or other wireless devices may suffer reception interference..
Power
supply
input
Digital Panel
Meter
24VDC
Line filter
Digital Panel
Meter
Shielded cable
Signal
input
Connect in the direction that
best reduces noise.

VIII
Alphabetic Characters for Setting Data
This manual uses the following alphabetic characters for setting data.
a b c d e f g h i j k l m
A B C D E F G H I J K L M
n o p q r s t u v w x y z
N O P Q R S T U V W X Y Z

IX
Table of Contents
PREFACE ................................................................................................................I
General Precautions..................................................................................................I
Other Informations ................................................................................................. II
Signal Words and Safety Notices .......................................................................... Ⅲ
Safety Precautions .................................................................................................IV
Installation and Noise Prevention Tips................................................................... V
Alphabetic Characters for Setting Data .................................................................VI
CHAPTER 1 INTRODUCTION............................................................. 1
1.1 Main Features.......................................................................................................... 2
1.2 Model Number Legend............................................................................................ 4
1.3 I/O Circuits.............................................................................................................. 5
1.4 Parts Name and Function......................................................................................... 8
CHAPTER 2 INSTALLATION AND CONNECTION .............................. 9
2.1 Installation............................................................................................................. 10
2.2 I/O Terminal Connections ..................................................................................... 12
CHAPTER 3 APPLICATION EXAMPLES........................................... 15
3.1 Monitoring the Remaining Quantity of Soup ........................................................ 16
3.2 Monitoring the Load Current of a Motor............................................................... 18
3.3 Monitoring the Quantity of Dust ........................................................................... 20
3.4 Monitoring the Internal Pressure of a Tank........................................................... 22
3.5 Monitoring the Rotational Speed of a Motor......................................................... 24
3.6 Using the Product as a Digital Indicator for PLC.................................................. 26
CHAPTER 4 INITIAL SETTING.......................................................... 29
4.1 Using the Product as a process meter .................................................................... 30
4.2 Using the Product as a Tachometer ....................................................................... 32
4.3 Using the Product as a Digital Indicator for PLC Data ......................................... 34
CHAPTER 5 OPERATION.................................................................. 37
5.1 Levels .................................................................................................................... 38
5.2 Moving among Levels........................................................................................... 39
5.3 Parameters ............................................................................................................. 42
5.4 Set Values.............................................................................................................. 44
5.5 Operation Level..................................................................................................... 45
5.6 Communication Writing Control........................................................................... 47

X
5.7 Key Protect Setting ................................................................................................48
5.8 Selecting an Input Type .........................................................................................50
5.9 Selecting an Analog Range....................................................................................51
5.10 Selecting an Input-pulse Frequency Range............................................................52
5.11 Specifying the Scaling Factor for Analog Input/Digital Data Display...................53
5.12 Specifying the Scaling Factor for Input Pulse Frequency......................................55
5.13 Specifying the Decimal Point Position ..................................................................58
5.14 Selecting the Output Operating Action..................................................................59
5.15 Performing Linear Output......................................................................................60
5.16 Specifying Communication Parameters.................................................................63
5.17 Clearing All Parameters.........................................................................................65
5.18 Specifying the Number of Measurements for Averaging ......................................66
5.19 Specifying the Function of the Event Input ...........................................................67
5.20 Specifying the Hysteresis.......................................................................................69
5.21 Specifying the Auto-zero Time..............................................................................71
5.22 Specifying the Startup Compensation Time ..........................................................73
5.23 Changing the Display Color...................................................................................75
5.24 Changing the Display Auto-return Time................................................................77
5.25 Changing the Move-to-Protect-Level Time ...........................................................79
5.26 Changing the Send Waiting Time..........................................................................81
CHAPTER 6 FUNCTION DESCRIPTION .......................................... 83
6.1 Measurement..........................................................................................................84
6.2 Scaling ...................................................................................................................86
6.3 Auto-zero/Startup Compensation...........................................................................88
6.4 Average Processing................................................................................................89
6.5 Event Input/Pulse Input..........................................................................................90
6.6 Process Value Hold................................................................................................91
6.7 Forced-zero ............................................................................................................92
6.8 Comparative Output...............................................................................................93
6.9 Hysteresis...............................................................................................................94
6.10 Display Color Change............................................................................................95
CHAPTER 7 COMMUNICATIONS ..................................................... 97
7.1 Communication Protocols......................................................................................98
7.2 Data Format Structure............................................................................................99
7.3 Structure of Command/Response Text ................................................................101
7.4 Variable Area.......................................................................................................102
7.5 Read from Variable Area ...................................................................................103
7.6 Write to Variable Area .......................................................................................104
7.7 Operation Instructions..........................................................................................105
7.8 Setting Areas........................................................................................................106
7.9 Commands and Responses...................................................................................107
7.10 Variable Area Map...............................................................................................115
7.11 Communications Control Flow............................................................................118
7.12 Programming Example ........................................................................................123

XI
CHAPTER 8 USER CALIBRATION.................................................. 127
8.1 User Calibration .................................................................................................. 128
8.2 User Calibration Processes.................................................................................. 130
CHAPTER 9 TROUBLESHOOTING GUIDE .................................... 133
9.1 Error Indications.................................................................................................. 134
9.2 Troubleshooting Table......................................................................................... 135
APPENDIX ...................................................................137
Specifications ............................................................................................ 138
Parameter List............................................................................................ 142
ASCII Code Table...................................................................................... 143

1.1 Main Features
1
INTRODUCTION
1 INTRODUCTION
1.1 Main Features ････････････････････････････････････････････ 2
1.2 Model Number Legend ････････････････････････････････････ 4
1.3 I/O Circuits ･･････････････････････････････････････････････ 5
Input Circuit Diagrams/Output Circuit Diagrams/
Internal Block Diagram
1.4 Parts Name and Function ･･････････････････････････････････ 8
This chapter provides an overview of the product.
CHAPTER

CHAPTER 1 INTRODUCTION
2
INTRODUCTION
1.1 Main Features
The K3GN is a digital panel meter that is capable of converting an input signal
into a digital value and displaying it on the main indicator.
The main futures of the product include the following.
This feature measures an input signal and displays it as a digital value.
An analog value (voltage/current), a rotational speed (pulses), or digital data
received via communication function can be selected as an input signal.
This feature converts an input signal into a
desired physical value
The figure on the right shows a scaling example
where input signals from a pressure sensor
ranging from 4 to 20 mA are converted into
values ranging from 0 to 100 (kPa). Scaling will
enable you to handle physical quantities easily
and intuitively.
This feature compares a scaled (process) value with a programmed OUT set value
and produces output according to the comparison result.
This is useful in monitoring various systems for malfunction or determining
whether products are within acceptance limits.
Three types of comparative outputs are available: those produced at the OUT
upper-limit value, the OUT lower-limit value, and both the OUT values.
Measurement
Comparative
Output
S
caling
4mA 20mA
100kPa
0kPa Input
Readout
Comparative output
produced at the OUT lower
limit value
Comparative output produced at
the OUT upper and lower limit
values
OUT upper
limit value
Comparative output
Comparative output
produced at the OUT upper
limit value
OUT lower
limit value
OUT upper
limit value
OUT
lower
limit
value
Comparative output Comparative output
PLC PC
Voltage/current
ON/OFF
RS485
K3GN
/ZERO
ZERO
HOLD
OUT1
(
(
8
T
(
8
(
CMW
OUT2
SV
K3GN
/ZERO
ZERO
HOLD
OUT1
(
(
8
T
(
8
(
CMW
OUT2
SV

1.1 Main Features
3
INTRODUCTION
This feature enables a process value
to be held while the external event
input stays ON.
The outputs are also retained.
This feature shifts a process value to zero, and can be used to evaluate and display
the deviation of a process value from a reference value.
The forced-zero function can be activated by using the
ZERO
/
key on the front
panel, via the event input terminal, or communications.
This feature allows programming of the display color. In the example shown
below, the display color is programmed so that it changes from green to red when
a comparative output turns ON. The display color can also be programmed so that
it changes red to green or is fixed to red or green.
This feature allows the host PC to read process values from the product or
read/write various parameter settings from/to the host PC.
The host PC provides logging of measured data and remote control to the product.
Communi-cation
Process
Value Hold
Forced-zero
Display Color
Change
((((8 8
T
((((8 8
T
((((8 8
T
485 232C
Process
value
HOLD input
1*005
8
T
OUT2 value
OUT1 value
1!236
8
T
1(781
8
T
Green
Red
Red
Process
value
ZERO input
Forced-zero value
(shifted value)
Measurement value
after executing the
forced-zero function

CHAPTER 1 INTRODUCTION
4
INTRODUCTION
1.2 Model Number Legend
1. Input Type
ND: DC voltage/current, NPN
PD: DC voltage/current, PNP
2. Output Type
C: 2 relay contact outputs (SPST-NO)
C-FLK: 2 relay contact outputs (SPST-NO) and RS-485
C-L1: 2 relay contact outputs (SPST-NO) and DC current (0 to 20 mA, 4 to 20 mA)
C-L2: 2 relay contact outputs (SPST-NO) and DC voltage (0 to 5 V, 1 to 5 V, 0 to 10 V)
T1: 3 transistor outputs (NPN open collector)
T1-FLK: 3 transistor outputs (NPN open collector) and RS-485
T1-L1: 3 transistor outputs (NPN open collector) and DC current (0 to 20 mA, 4 to 20 mA)
T1-L2: 3 transistor outputs (NPN open collector) and DC voltage (0 to 5 V, 1 to 5 V, 0 to 10 V)
T2: 3 transistor outputs (PNP open collector)
T2-FLK: 3 transistor outputs (PNP open collector) and RS-485
3. Option
None: None
-400: Normally energized relays
4. Supply Voltage
24 VDC: 24 VDC
 List of Models
Output typeSupply
voltage Input type Judgement output Data transmission output Model
None K3GN-NDC 24 VDC
RS-485 K3GN-NDC-FLK 24 VDC
DC current (0 to 20 mA,
4 to 20 mA) K3GN-NDC-L1 24 VDC
2 relay contact outputs
(SPST-NO)
DC voltage (0 to 5 V,
1 to 5 V, 0 to 10 V) K3GN-NDC-L2 24 VDC
None K3GN-NDC-400 24 VDC
RS-485 K3GN-NDC-FLK-400 24 VDC
DC current (0 to 20 mA,
4 to 20 mA) K3GN-NDC-L1-400 24 VDC
2 relay contact outputs
(SPST-NO)
Normally energized
relays (See note.) DC voltage (0 to 5 V,
1 to 5 V, 0 to 10 V) K3GN-NDC-L2-400 24 VDC
None K3GN-NDT1 24 VDC
RS-485 K3GN-NDT1-FLK 24 VDC
DC current (0 to 20 mA,
4 to 20 mA) K3GN-NDT1-L1 24 VDC
DC voltage,
DC current,
or NPN
input
3 transistor outputs
(NPN open collector)
DC voltage (0 to 5 V,
1 to 5 V, 0 to 10 V) K3GN-NDT1-L2 24 VDC
None K3GN-PDC 24 VDC2 relay contact outputs
(SPST-NO) RS-485 K3GN-PDC-FLK 24 VDC
None K3GN-PDT2 24 VDC
24 VDC
DC voltage,
DC current,
or PNP
input
3 transistor outputs
(PNP open collector) RS-485 K3GN-PDT2-FLK 24 VDC
Note: Refer to page 6 for information on models with normally energized relays.

1.3 I/O Circuits
5
INTRODUCTION
1.3 I/O Circuits
 Input Circuit Diagrams
 Analog Input
 Event Input/Pulse Input
 Output Circuit Diagrams
 Contact Output
Voltage input Current input
NPN input PNP input
1
3
2
2.35KΩ
4.7KΩ
24VDC-
HOLD/ZERO
Pulse
24VDC+ 1
3
2
2.35KΩ
4.7KΩ
24VDC-
24VDC+
HOLD/ZERO
Pulse
12
11
9
COM
OUT2
OUT1
5V
5V
-
+
A
B
A
D
Voltage
COM
4
5
-
+
60Ω
A
D
Current
COM
6
5
A
+B = 1MΩ
To To

CHAPTER 1 INTRODUCTION
6
INTRODUCTION
 Models with Normally Energized
Relays K3GN-NDC-@-400 24 VDC
• The drive operation for the output relay is
reversed in these models.
• Relay contacts can be made open (i.e., OFF)
when comparative set values are being judged.
This is effective when constructing systems that
take failsafe measures into consideration.
List of Models
Models with Normally Energized Relays
K3GN-NDC-400 24 VDC
K3GN-NDC-FLK-400 24 VDC
K3GN-NDC-L1-400 24 VDC
K3GN-NDC-L2-400 24 VDC
 Transistor Output
 Linear Output
Relation between Output Type and
Relay Output Operation
L
5KΩmin. L 500Ωmax.
7
8
+
-
+
-
7
8
+
-
+
-
NPN output PNP output
11
12
10
9
COM
OUT2
PASS
OUT1
8.2Ω
8.2Ω
8.2Ω
8.2Ω
11
12
10
9
COM
OUT2
PASS
OUT1
8.2Ω
8.2Ω
N
ote: If Upper/Lower Limit is
selected, the upper limit
and lower limit for the
comparative set value
can be set individually
and will be displayed
for OUT1 and OUT2.
Linear current output
Linear voltage output

1.3 I/O Circuits
7
INTRODUCTION
 Internal Block Diagram
Microcomputer
Drive circuit
Key Display
A
D
convertor
Input circuit
EEPROM
Communi-
cation
driver
Waveform
recitification
circuit
Constant-voltage
circuit 1
Control
input
circuit
Drive circuit
Drive circuit Output
Constant-voltage
circuit 2
Power supply
circuit
Operation
power supply
Event input/
pulse input
terminal
Communi-
cation
terminal
Contact
output
Transistor
output
A
nalog input
terminal *4
*2
*3
*1 Available only for the product with transistor output
*2 Available only for the product with relay output
*3 Available only for the product with communication interface
Drive circuit Output
circuit
circuit
Linear current/
Voltage output
*4 Available only for the product with linear current/voltage output