Unipulse F331 User manual

OPERATION MANUAL
26MAY2014REV.1.02
DIGITAL INDICATOR
F331

Introduction
I
Introduction
I
Introduction
Thank you very much for purchasing our Digital Indicator F331.
The F331 is a digital indicator for a strain gauge sensor, DIN96×48mm in size.
It is best suited for quality control in production lines, including pressure load control of pressing,
pressurizing, caulking, etc., and torque control of rotating devices.
The USB interface is included as standard, which facilitates introduction into a system that is formed
by using the Specific PC software.
To take full advantage of high performance of F331, thoroughly read this operating manual first before
use and understand the explanations contained herein for correct operating procedures.
Also, carefully store this instruction manual so that it can be referred to at any time.
Safety Precautions
Installation, maintenance and inspection of the F331 should be performed by personnel having
technical knowledge of electricity.
In order to have an F331 Weighing Indicator used safely, notes I would like you to surely follow divide
into " " and " ", and are indicated by the following documents. Notes
indicated here are the serious contents related to safely. Please use F331 after understanding the
contents well.
For safety reasons, please read the following safety precautions thoroughly.
WARNING
This sign forewarns the presence of hazards that could result in serious injury or
fatality when incorrectly handled.
CAUTION
This sign forewarns the presence of hazards that could result in personnel injury or
property damage when incorrectly handled.
WARNING
CAUTION

WARNING
II
WARNING
II
WARNING
●For the entire system to function safely when the F331 becomes faulty or malfunctions,
provide a safety circuit outside the F331.
●Before using the F331 as described below, make sure to consult with our sales personnel.
- Use in environments not described in the operation manual.
- Use greatly impacting human lives and assets, such as medical devices, transport devices
entertainment devices, and safety devices.
●Do not disassemble, repair, or modify the F331. Doing so may cause a fire or an electric
shock.
●Do not install in the following environments.
- Places containing corrosive gas or flammable gas.
- Where the product may be splashed with water, oil or chemicals.
●Do not connect a commercial power source directly to the signal input/output terminals.
●Be sure to ground the protective ground terminal.
●Before performing the following, make sure that no power is applied.
- Attachment/detachment of connectors of options, etc.
- Wiring/connection of cables to the signal input/output terminals.
- Connection to the ground terminal.
●For connection to the signal input/output terminals, check the signal names and pin
assignment numbers, and then carry out wiring properly.
●To take measures against lightning surge, install a lightning surge protector (optionally
available).
●Before applying power, carefully check the wiring, etc.
●Use a power supply voltage and load within the specified and rated ranges.
●Do not damage the power cord. Doing so may cause fire or electric shocks.
●Do not touch any signal input/output terminal while applying power. Doing so may cause
electric shocks or malfunctions.
●If the cover of the main body is opened, it may cause an electric shock internally. Even if the
power is off, the internal capacitor is charged. Contact us for internal inspection or repair.
●In the case of smoke, an abnormal smell or strange sound, immediately turn off the power,
and disconnect the power cable.
This sign forewarns the presence of hazards
that could result in serious injury or fatality
when incorrectly handled.
Warning on design
Warning on installation
Warning on wiring
Warning during startup and maintenance

CAUTION
III
CAUTION
III
CAUTION
●Use the F331 as it is incorporated in a control panel, etc.
●Do not install in the following environments.
- Where the temperature/humidity exceeds the range of the specifications.
- Where the temperature changes remarkably or there is a danger of freezing or condensing.
- Outdoors, or where the altitude exceeds 2000m.
- Places exposed to direct sunlight
- Dusty places
- Places containing large quantities of salt or iron powder.
- Where the main body is directly affected by vibrations or shocks.
●Take adequate shielding measures when using at the following locations.
- Near a power line.
- Where a strong electric field or magnetic field is formed.
- Where static electricity, relay noise or the like is generated.
●Install the F331 as far away from devices generating high frequency, high voltage, large
current, surge, etc., as possible. Also, carry out wiring separately from their power lines. Do
not carry out parallel wiring and common wiring.
●Do not use it, when it is broken down.
●Tighten the screws for the screw type terminal block at the specified torque.
If they are loose, shorts, fire or malfunctions may occur.
Tightening torque: 0.2 to 0.6 N•m
●For sensors, external inputs/outputs and options, use shielded cables.
●For turning on/off the power, be sure to keep intervals of 5 seconds or more.
●After power-on, make sure to warm up the F331 for at least 30 minutes or more before use.
●If the F331 is not used by the specified method, its protective performance may be impaired.
●Maintenance
- When performing maintenance, disconnect the power.
- Do not wipe with a wet rag, or with benzine, thinner, alcohol, etc. Doing so may cause
discoloration or deformation of the F331. In the case of heavy contamination, wipe off
the contamination with a cloth after dipping it into a diluted neutral detergent and squeeze
it well, and then wipe with a soft, dry cloth.
●Although packing at factory has been considered as shocks can sufficiently be absorbed,
breakage may result if shocks are applied when the spacers are reused for transportation.
If you send the F331 to us for repair, etc., take adequate measures against shocks by using
polyurethane materials, etc., separately.
●If you dispose of the product, handle it as industrial waste.
This sign forewarns the presence of hazards
that could result in personnel injury or property
damage when incorrectly handled.
Caution on installation
Caution on wiring
Caution during startup and maintenance
Caution during transportation
Caution during disposal

Conformity with EC Directives
IV
Conformity with EC Directives
IV
Conformity with EC Directives
The F331 Digital Indicator is a CE-marked EC-Directive-conforming product (by the Council of the
European Union).
- EMC Directives EN61326-1
When installing, attention should be given to the following.
1. Since the F331 is defined as open type (built-in equipment), be sure to use it as installed and
fixed to a panel, etc.
2. Use shielded cables (for sensors, external input / output, and option).
◆Connection of a lightning surge protector
EMC Directive EN61000-4-5 (Lightning Surge Immunity) is met by the F331 body in combination
with a lightning surge protector.
For conformity with EMC Directives, attach a lightning surge protector to the power supply line.
< Shape >
◆Connection of a USB connector
For conformity with EMC Directives, attachment of a
cap for USB connector.
EN55011, EN61000-4-2, EN61000-4-3, EN61000-4-4
EN61000-4-5, EN61000-4-6, EN61000-4-8
EMC Directive EN61000-4-5 (Lightning Surge Immunity) is met by the F331 body in
combination with a lightning surge protector.
For conformity with EMC Directives, attachment of a cap for USB connector.
Point
* PT-BE/FM and PT 2-PE/S-24AC-ST are registered trademarks of PHOENIX CONTACT.
PT-BE/FM (DIN rail mount type)
PT 2-PE/S-24AC-ST
USB connector
Cap

RoHS-compliant Product
V
RoHS-compliant Product
V
< Connection >
RoHS-compliant Product
The parts and attachments (including the instruction manual, packaging box, etc.) used for this unit are
compliant with the RoHS Directive restricting the use of hazardous substances with regard to adverse
effects on the environment and human body.
What is RoHS?
It is an abbreviation for Restriction on Hazardous Substances, which is implemented by the European
Union (EU). The Directive restricts the use of six specific substances in electric and electronic
equipment handled within EU borders. The six substances are lead, mercury, cadmium, hexavalent
chromium, PBB (polybrominated biphenyls), and PBDE (polybrominated diphenyl ethers).
6
4
2
5
3
1
L
N
IN OUT
L
N
PT 2-PE/S-24AC-ST
PT -BE/FM
Lightning surge protector
F331
＋
－
DC IN
×
＋
－
{
11
12
To 24V
DC power
supply
Be sure to ground of the lightning surge protector.
Without grounding, it will not function as a lightning surge protector.
Attention
No lightning surge protector is included as standard (optionally available).
Purchase it from PHOENIX CONTACT or us.
We sell lightning surge protectors (PT 2-PE/S-24AC-ST) and lightning surge
protector terminal blocks (PT-BE/FM) as a set.
Specify "TSU03."
Point
Please inquire of our sales person about the RoHS-compliance of the option.
Point

Contents
VI
Contents
VI
Contents
1 OUTLINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1. Contents of the package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-2. About connectable devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-3. Appearance description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
■Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
■Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 CONNECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2-1. Connection of the signal input/output terminal block . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2-2. Connection of the strain gauge sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
■4-wire strain gauge sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
■6-wire strain gauge sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2-3. Connection of the power input terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2-4. Connection of the protective ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2-5. Connection of the external output (sink type) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2-6. Connection of the external input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 SETTING METHOD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3-1. Preparation of PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
■PC hardware requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
■Installation of a USB driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
■Connection of USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
■The check of a virtual COM port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3-2. Starting of the F331 PC application software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
■Installation of the F331 PC application software . . . . . . . . . . . . . . . . . . . . . . . . . 10
■The injection of a power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
■Starting of the F331 PC application software . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
■Specification of a COM port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
■The check of a indicating value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3-3. List of setting values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
■Comparison setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
■Operation setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
■Calibration setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
■Option setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3-4. Setting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 HOW TO CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4-1. Equivalent input calibration procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Contents
VII
Contents
VII
4-2. Actual load calibration procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4-3. Decimal place. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4-4. Equipment ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5 SETTING OF FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5-1. HI-LO limit comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5-2. Hysteresis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
5-3. Near zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
5-4. Comparison timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5-5. Digital offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5-6. Moving average filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5-7. Digital low pass filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5-8. Hold mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
■Sample (The arbitrary points are held.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
■Peak (The maximum point is held.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
■Bottom (The minimum point is held.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
■P-P (The difference of the maximum point and the minimum point is held.) . . . . 20
5-9. Digital zero function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
■Digital zero by key operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
■Digital zero by external signal input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5-10.ZERO key valid/invalid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5-11.Display frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6 EXTERNAL INPUT/OUTPUT SIGNALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6-1. Connector pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6-2. External input signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
■Hold/Judge <edge input> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
■Digital zero <edge input> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6-3. External output signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
■External output selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
■OK/ NG/ HH/ HI/ LO/ LL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7 OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7-1. BCD data output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
■Equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
■Connector pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
■BCD output mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
■BCD data update rate selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
■BCD external output selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7-2. D/A converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Contents
VIII
Contents
VIII
■Current output (DAI option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
■D/A zero and full scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
■D/A output mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7-3. RS-485 interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
■Communication specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
■RS-485 connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
■RS-485-related setting values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
■UNI-Format commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
■UNI-Format (continuous) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
■Modbus-RTU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
■Setting value LOCK/ Calibration value LOCK . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7-4. RS-232C interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
■Communication specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
■Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
■RS-232C-related setting values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
■Command communication formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
■Setting value communication formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
■Continuous transmission formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
■Setting value LOCK/ Calibration value LOCK . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8-1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
■Analog section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
■Display section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
■Setting section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
■External signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
■Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
■Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
■General specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
■Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8-2. Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
■When the BCD output option is equipped . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
■When the D/A converter option is equipped. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
■When the RS-485 option is equipped. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
■When the RS-232C option is equipped . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
8-3. Mounting on a panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
8-4. Block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
9 SUPPLEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
9-1. Error / Message display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
■Over scale display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
■Calibration error display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
■Message display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
9-2. Self-check/initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
■Self-check (at power-on) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
■Self-check (When PC application is activating) . . . . . . . . . . . . . . . . . . . . . . . . . . 78
■Initialization (When PC application is activating) . . . . . . . . . . . . . . . . . . . . . . . . . 78

1
1 OUTLINE
1
OUTLINE
Chapter
1
1-1. Contents of the package
The packaging box contains the following.
Make sure to check them before use.
1-2. About connectable devices
1OUTLINE
F331 body・・・1 F331 quick manual・・・1
Short bar・・・1
(When RS-485 option is selected)
BCD output connector・・・1set
(When BCD output option is selected)

2
1 OUTLINE
2
OUTLINE
Chapter
1
1-3. Appearance description
■Front panel
①Status display
The F331 status is indicated.
MINUS This LED turns on when the indicated value is minus.
HOLD This LED turns on when the indicated value is the held value.
Blinks during hold detection.
OK Lights when “OK” is ON.
②Numerical display
The two types of display are provided.
(1) Indicated value
(2) Error/Message display
See "9-1.Error / Message display" on page 77.
③Setting key
Forcibly zeros the indicated value by the digital zero function.
④USB connector (with a cap)
This is an interface for connection with a personal
computer (PC).
①Status display ②Numerical
③Setting key
display
④USB connector
(with a cap)
ZERO
USB connector
Cap

3
1 OUTLINE
3
OUTLINE
Chapter
1
■Rear panel
①Protective ground
This is a protective ground terminal block. Be sure to ground the protective ground terminal to
prevent electric shocks and failures by static electricity. (The frame and protective ground terminal
are conducted.) Do not use other screws than that attached to the main body (M4×8 binding-head
machine screw with a toothed washer).
②Signal input/output terminal block
This terminal block is used for input/output of control signals and input of strain gauge sensor
signals.
- Terminal block assignment
1 to 5: Terminal for connecting a strain gauge sensor.
1SHIELD
2+EXC
3-SIG
4-EXC
5+SIG
6・7: Terminals for inputting Hold/Judge signals.
6COM
7 IN1 (Hold/Judge input)
6・8: Terminals for inputting digital zero signals.
6COM
8 IN2 (DZ input)
②Signal input/output terminal block
①Protective ground
③Option slot
113

4
1 OUTLINE
4
OUTLINE
Chapter
1
6・9・10: Terminals for outputting comparison.
Selectable by setting. (OK/ NG/ HH/ HI/ LO/ LL)
6COM
9 OUT1 (Initial value: HI)
10 OUT2 (Initial value: LO)
11 to 13: Terminals for inputting power. The input voltage is DC24V (±15%).
11 +
12 -
13 FG
③Options slot
One option board can in stall in the option slot.
- BCD parallel data output (BCO)
- D/A converter (current output) (DAI)
- RS-485 interface (485)
- RS-232C interface (232)

5
2 CONNECTION
5
CONNECTION
Chapter
2
Precautions about connection to the signal input/output terminal block are given below.
The precautions described here are important for safety.
Please properly understand the descriptions before connection.
WARNING
- Do not connect a commercial power source directly to the signal input/output
terminals.
- Connect to the signal input/output terminals with no power applied because it may
cause an electric shock.
- For connection to the signal input/output terminals, check the signal names and pin
assignment numbers, and then carry out wiring properly.
- After wiring, be sure to mount the attached terminal block cover. Otherwise, it may
cause an electric shock.
- Before applying power, carefully check the wiring, etc.
- Do not touch any signal input/output terminal while applying power.
Doing so may cause electric shocks or malfunctions
CAUTION
- Tighten the terminal screws at the specified torque.
If they are loose, shorts, fire or malfunctions may occur. (When D/A converter, RS-
232C, or RS-485 option is installed)
Tightening torque: 0.2 to 0.6 N•m
- Use shielded cables.
2CONNECTION

6
2 CONNECTION
6
CONNECTION
Chapter
2
2-1. Connection of the signal input/output terminal block
1. Peel the sheath of the wire to be connected 5mm,
and twist the end to such an extent that it will not
become loose.
2. Remove the terminal block from the F331 body
with a strong pull.
3. Loosen the screw with a screwdriver to open the
hole. A screwdriver with a shaft diameter of
3.0mm is recommendable.
(precision screwdriver, etc.)
4. Insert the wire into the hole so as not to loosen
the end.
5. Tighten the screw with the screwdriver.
6. Lightly pull the wire to check that it is clamped
securely.
* Connectable wires are 0.21 - 3.31mm2(AWG12 - 24).
Recommendable tightening torque is 0.2 to0.6 Nm.
7. Insert the wire-connected plug into the
F331 body, and tighten the screws
(two).
* The number of pins is 13.
Turn counterclockwise.
Hole
Turn clockwise.
Turn clockwise.
Screws (two)
When mounting the terminal block to the
F331 body, check its vertical orientation.
(See the illustration on the right-hand side.)
Insertion side
UP
DOWN
Attention

7
2 CONNECTION
7
CONNECTION
Chapter
2
2-2. Connection of the strain gauge sensor
Connect a strain gauge sensor.
The excitation voltage is 2.5V or 5V. (designated when ordered)
The maximum output current is 30mA.
■4-wire strain gauge sensor
■6-wire strain gauge sensor
For connecting a 6-wire strain gauge sensor, short-circuit +EXC and +S, and -EXC and -S.
Signal input/output
12345
+EXC -SIG -EXC +SIG
2345
Strain gauge sensor
SHIELD
1
terminal block
With mark: The excitation voltage is 5V.
With no mark: The excitation voltage is 2.5V.
BV5
Point
(+EXC)
(-EXC)
(+SIG)
(-SIG)
(SHIELD)
+IN
-OUT
-IN
+OUT
2
5
F331
1
3
4
(+EXC)
(-EXC)
(+SIG)
(-SIG)
(SHIELD)
+IN
-OUT
-IN
+OUT
2
5
F331
1
3
4

8
2 CONNECTION
8
CONNECTION
Chapter
2
2-3. Connection of the power input terminal
Connect the DC power cord.
The input voltage is 24V (±15%).
1. Make sure that no power is applied.
2. Please connect the positive(+) and negative(-) of a power supply.
2-4. Connection of the protective ground
The grounding terminal is for prevention of electric shocks and failures caused by static electricity.
Use an approx. 0.75mm2thick wire, and be sure to ground.
WARNING
- Connect with no power applied because it may cause an electric shock.
- Be aware that the voltage drops depending on the wire thickness and length.
Also, never input AC power source. Doing so will cause a failure.
- Since the F331 has no power switch, install a breaker.
- Be sure to ground the protective ground terminal to prevent electric shocks and
failures by static electricity.
(The frame and protective ground terminal are conducted.)
Do not use other screws than that attached to the main body.
- To take measures against lightning surge, install a lightning surge protector
(optionally available).
Protective ground
11 12 13
＋－FG
(functional ground)
The DC power code is not a standard accessory.
Point

9
2 CONNECTION
9
CONNECTION
Chapter
2
2-5. Connection of the external output (sink type)
The external output circuit is operated through an open collector. 6 is the common terminal.
The open collector output capacity is 120mA and the withstand voltage is up to 30V.
- Equivalent circuit
2-6. Connection of the external input
- Equivalent circuit (input)
CAUTION
- Avoid applying external voltages to the signal input circuit.
- Use external elements which withstands Ic=10mA or above.
- Leakage current from external element must be 30μA or below.
COM
Spark killer
Load
F331 Inside
Spark killer
DC
Varistor
Load
Relay
Vext
Supply an external power source for a relay drive
Output data Tr
OFF OFF
ON ON
●Output transistor status
9, 10
6
Power
supply
AC
Power
supply
power source (Vext).
Vcc
←Inside
Ic=Approx.6mA
COM
Push
switch
Toggle
switch
Relay
contact
Transistor
+12V
IN
IN
TTL open
collector output
Outside →
F331
(ON when IN is ‘H’)
7, 8
6

10
3 SETTING METHOD
10
SETTING METHOD
Chapter
3
3-1. Preparation of PC
■PC hardware requirement
OS: Windows7 Home Premium/Professional/Ultimate 32/64bit
English-language edition, The simplified chinese edition
Display: 800×600 pixels or more
USB port: One empty port
USB driver: Virtual COM Port(VCP) Drivers by FTDI Ltd.
■Installation of a USB driver
Please install a USB driver for connecting with USB of the F331.
Please see the homepage of FTDI for details and perform download and installation of the driver
according to a procedure.
Guide: http://www.ftdichip.com/Support/Documents/InstallGuides.htm
Driver: http://www.ftdichip.com/Drivers/VCP.htm
■Connection of USB
Please the cap of the USB connector and connects a USB cable.
The USB connector of the F331 is mini-B TYPE.
■The check of a virtual COM port
Please check the virtual COM port number which the F331 is connected from the device manager
of PC.
3-2. Starting of the F331 PC application software
■Installation of the F331 PC application software
Setting up the F331 by the F331 PC application software and use it for data management at system
introduction and data analysis for troubleshooting.
Please download and install it from the Unipulse homepage.
* http://www.unipulse.com/en/products/index.html
3SETTING METHOD
Download a compressed file from download page to a PC.
Decompress the compressed file by the PC then start installer.
Complete the installation according to the guide.

11
3 SETTING METHOD
11
SETTING METHOD
Chapter
3
■The injection of a power supply
On the power supply of F331.
Please check that a display comes.
■Starting of the F331 PC application software
The F331 PC application software will start by executing an EXE file.
If there is no shortcut on the desktop, please run the EXE file from the
destination folder.
■Specification of a COM port
Please specify virtual COM port that is confirmed on "COM port" in the window menu.
■The check of a indicating value
Check if indicating value on the F331 is displayed.
* It is a Logging screen at the first time starting.
EXE file
The indicating value of the F331