OMRON ZFV Intelligent Sensor Practical Guide

ZFV Intelligent Sensor Practice: A Complete Guide from Installation, Debugging to Troubleshooting

In the field of industrial visual inspection, the OMRON ZFV series intelligent sensors provide on-site engineers with a "what you see is what you get" inspection experience with their built-in LCD monitor, intuitive icon menu, and rich inspection tools. However, beginners often encounter challenges in installation, debugging, and troubleshooting when faced with different models (single function/standard), different detection modes (pattern search, brightness, area, width, position, counting, characters), and multiple trigger and output configurations. This article is based on the technical data of ZFV series Ver 2.0, providing a complete engineering practical guide from hardware installation, basic configuration, teaching execution, threshold adjustment to common problem diagnosis.

System Overview and Selection Points

The ZFV intelligent sensor adopts a split architecture of "sensor head+amplifier unit", with the core advantage being that the amplifier unit is equipped with a 1.8-inch color LCD and an icon style menu, allowing users to confirm images and set parameters in real time without connecting to a computer.

1.1 Sensor head selection

Model type setting distance detection range (H × V)

ZFV-SR10 narrow field of view 34~49mm 5 × 4.6mm~9 × 8.3mm

ZFV-SR50 wide field of view 38~194mm 10 × 9.2mm~50 × 46mm

The sensor head is equipped with red LED pulse illumination and a 1/3-inch CCD (partial scanning), with an electronic shutter speed of 1/1000 to 1/4000 seconds. Protection level IP65, suitable for dusty or humid environments. During installation, the detection area and focal position can be confirmed through green guiding light.

1.2 Selection of amplifier units

Characteristics of Model Output Type Testing Items

ZFV-A10 NPN Pattern, Brightness Single Function Type

ZFV-A15 PNP pattern, brightness single function type

ZFV-A20 NPN Pattern, Brightness, Area, Width, Position, Count, Character Standard Type

ZFV-A25 PNP Same as Standard Type

Selection suggestion: Choose the single function type only when detecting for presence or brightness changes; Choose the standard type for size measurement, position offset, counting, or character detection.

1.3 Extended Configuration

Up to 5 amplifier units can be installed side by side: it can simultaneously process multiple areas of one sensor head image (such as four side position detection), or multiple sensor heads can synchronously detect different parts of the workpiece.

Connect data storage unit ZS-DSU: expandable to 128 banks, and record measurement images and values (before and after saving images triggered by NG) for easy traceability of the cause of defects.

Extension cable: Use ZFV-XC3BV2 (3m)/XC8BV2 (8m) ordinary cable or ZFV-XC3BRV2 robot cable (bending resistant). Two extension cables can be docked, with a total length of up to 19m (subject to the total length limit between the controller and camera, refer to the controller manual for actual reference).

Hardware installation and electrical connection

2.1 Installation of amplifier unit

DIN rail installation:

Hook the connector side of the amplifier unit onto the upper edge of the DIN rail.

Press down until the hook on the I/O cable side clicks into place.

When installing side by side, open the connector cover, insert the control connection unit (ZS-XCN), and then slide the amplifier unit to connect the connectors.

Attention: The connector side must be hooked onto the guide rail first, not the I/O cable side, otherwise the installation strength will be insufficient.

Panel installation (using ZS-XPM1/XPM2 panel installation adapter):

The first one uses ZS-XPM1, followed by ZS-XPM2.

Push the amplifier unit forward from the back of the panel, insert the adapter from the front, and secure it with an installation fixture.

2.2 I/O Cable Wiring

The ZVF amplifier unit comes with an I/O cable (approximately 2m), and each lead is defined as follows:

Lead color/function description

Power supply (brown) DC24V ± 10%

GND (blue) 0V

OUTPUT (black) judgment result output (NPC/PNP open collector, 50mA max)

ENABLE (orange) ready to output (ON in RUN mode)

ERROR (white) error output

TEACH (Powder) Teaching Input

TRIG (gray) measurement trigger input

BANK1~3 (purple/red/green) Bank switching input

NPN output type internal circuit: OUTPUT is an NPN open collector, which outputs a low level (≤ 1.2V) when turned on. The load should be connected between OUTPUT and 24V+. PNP output type: When turned on, it outputs a high level (power supply voltage within -1.5V), with the load connected between OUTPUT and 0V.

2.3 Sensor head installation

Determine the installation distance based on the detection range setting distance curve. For example, when ZFV-SR50 requires a detection range of 25mm, the set distance is approximately 95mm.

Rotate the focus adjustment knob to make the green guide light the thinnest (in focus).

For reflective workpieces (such as metal mirrors), tilt the sensor head to avoid direct reflection of mirror light into the receiver.

Be sure to turn off the amplifier power before connecting the sensor head, otherwise it may damage the sensor head.

2.4 Rules for Parallel Installation

Up to 5 amplifier units.

The image data is transmitted from the right unit to the left, and the TRIG signal is also transmitted from the right to the left.

Host Device: A unit that receives TRIG/TEACH signals and outputs comprehensive judgment results, usually the rightmost unit.

Client Device: Other units that do not receive external TRIG/TEACH.

Comprehensive judgment output (ALL mode): If any unit is NG, the total output is NG.

The new and old versions of amplifier units (distinguished by serial numbers) cannot be mixed (see page 94 for details).

Basic operations and mode switching

3.1 Three working modes

Mode switch position, mode purpose

MENU menu mode sets measurement conditions and executes teaching

ADJ adjustment mode adjustment judgment threshold

RUN mode performs actual measurements and outputs results

3.2 Two menu levels

STD menu (standard menu): Set the most basic measurement conditions.

EXP menu (expert menu): Detailed settings, including output conditions, communication environment, I/O monitoring, etc.

Switch through the menu selection switch at the top of the amplifier unit.

3.3 Key Functions

←/→: Move menu in MENU mode; Select the threshold type (upper/lower limit) in ADJ mode.

↑/↓: Change values or select parameters.

TEACH/VIEW: Teaching in MENU mode; Switch screen display in RUN/ADJ mode.

SET: Select/apply settings.

ESC: Return to the previous menu.

Teaching Practice

Teaching is the process of registering the image features of qualified products as reference templates. ZFV supports two teaching methods: button teaching and external signal teaching.

4.1 Selection of Teaching Types

Select from MENU mode → [ITEM] based on the detection content:

Testing content, teaching type, applicable scenarios

Pattern/Shape/PATTERN/SEARCH recognition of product direction, with or without markings (supports ± 45 ° tilt)

Pattern matching PATTERN/MATCH recognizes different objects (does not support tilting, but is more refined)

Brightness/scratches/dirt BRIGHT detects surface defects and indicator lights on/off

Area Area: Check for screws and missing materials

WIDTH width detection for lead spacing and label offset

Position POSITION detects label offset and edge position

Count COUNT, count the number of pins and cables

Character (whole string) CHARA 1 detects whether there is a print date

Character (missing) CHARA 2 detects missing single characters

4.2 Button Teaching Process

Mode switch → MENU, move the cursor to [TEACH] → SET.

Adjust the position of the workpiece so that the part to be inspected is within the frame.

Select [1. ITEM] → SET, choose the teaching type.

Press the TEACH key to perform teaching.

After successful teaching, switch to mode → ADJ and adjust the threshold.

Mode switch → RUN, start measuring.

Key point: After teaching, it is necessary to switch to ADJ mode to adjust the threshold, otherwise the judgment may be inaccurate.

4.3 External Signal Teaching

Shutdownary teaching for workpieces:

Set [SYS1] → [TEACH TYPE] to [STATIONARY].

External TEACH signal ON → ENABLE OFF → Input TRIG → ENABLE ON, confirm the status of the ERROR signal.

Moving teaching of workpieces:

Suitable for workpieces that cannot be stopped (such as assembly lines).

It is necessary to continuously input the TRIG signal 6 times, each time corresponding to a position of the workpiece.

TRIG interval should be at least 200ms (when installed side by side).

Threshold adjustment techniques

Adjust the threshold according to the measurement type in ADJ mode. The following are the key thresholds for each type:

5.1 PATTERN/SEARCH、MATCH、CHARA2

Correlation value: 0~100, set the lower limit of OK. The higher the value, the stricter the requirements.

5.2 BRIGHT

Average concentration value: 0~255, set the OK brightness range (upper and lower limits).

Concentration deviation value: 0~127, used for detecting scratches/dirt (large deviation indicates unevenness).

5.3 AREA

Area value: 0~999, set the percentage range of OK based on the teaching area of 100%.

5.4 WIDTH

Edge width: Set the OK range based on the teaching width of 100%.

Edge level: 0~100, set the threshold for determining the concentration change at the edge. Adjust this value when the measurement is unstable.

5.5 POSITION

Position: Display offset (in pixels), set OK range.

Edge level: Same as above.

5.6 COUNT

Quantity: Set the OK counting range (0~255).

Edge level: Same as above.

5.7 CHARA 1

Concentration distribution value: Set the OK lower limit based on a teaching concentration of 100%.

System environment settings

6.1 Balance between measurement speed and accuracy

MENU mode → [SYS1] → [IMAGE RATE]:

FINE: High precision, long measurement time.

NORMAL: Standard (default).

HIGH SPEED: High speed, rough image, reduced accuracy.

6.2 Measurement Timing

TRIG (Synchronous Measurement): The rising edge of the TRIG signal triggers one measurement.

Continuation: Repeated measurements during TRIG ON.

6.3 Output Condition Configuration (EXP Menu)

Menu Item Options Description

[ON STATUS] OK ON/NG ON conditions for output signal ON

[ONE SHOT] OFF/ON is a single pulse output

[OUT TIME] 0~255ms single pulse width

[ON DELAY] 0~255ms output ON delay

[OFF DELAY] 0~255ms output OFF delay

6.4 Output Settings for Parallel Installation

MENU mode → [SYS2] → [LINKSET]:

[TRIG]: Set the host as [I/O] to receive external triggers; Set as the slave synchronization host triggered by [LINK].

[HEAD]: Set the unit connecting the sensor head to [USE]; Set unconnected as [NOT USE] (the image is obtained from the unit on the right).

[OUTPUT]: [ALL] Output the comprehensive judgment results of all units; [EACH] Each unit outputs independently.

Troubleshooting and Common Problems

7.1 Abnormal indicator light

Possible causes and countermeasures for the phenomenon

The OUTPUT indicator light is not on [ON STATUS]. If the setting does not match the judgment result, check whether it is set to OK ON or NG ON

The RUN indicator light is not on, and the mode switch is not in RUN mode. Switch to RUN mode

LCD dark Eco mode activated (no operation for 3 minutes) Press any key to restore, or turn off Eco mode

No image display sensor head connected; Check the connection when the LED brightness is 0; Adjust [CUTOM] → [LIGHT]

7.2 Error Messages

Reason for error message and countermeasures

HEAD IS NOT CONNECTED Sensor Head Not Connected Correctly Check Connector

NEIGHBOR UNIT IS NOT CONNECTED Poor connection during parallel installation, re connect amplifier unit

TEACHING FAILED workpiece is not in view; Improper setting of teaching area, adjustment of position or area

BANK DATA ERROR Bank data corruption Initialize bank data and reset

SYSTEM ERROR Hardware or software failure contact OMRON

7.3 Frequently Asked Questions Q&A

Q: Can the LED lighting of the sensor head be turned off?

A: Okay. Set to [0000] in [CUTOM] → [LIGHT].

Q: How to shorten the measurement time?

A: Two methods: 1) Set [IMAGE RATE] to [HIGH SPEED]; 2) Press the TEACH/VIEW key in RUN mode to switch to "image display only" (reducing display processing time).

Q: What if the teaching is not successful?

A: 1) Check if the workpiece is within the teaching area; 2) Adjust [CUTOM] → [LIGHT] to make the image clearer; 3) Check if the TRIG timing is correct during mobile teaching; 4) Make sure not to press the TEACH key while moving/adjusting the screen in the area.

Q: Has the search area been changed, but the search is still being conducted outside the area?

A: After changing the customer setting, the teaching must be re executed.

Q: When will the measurement conditions be saved to the amplifier?

A: When external TEACH signal teaching is successful; 2) When switching to RUN mode. If the TEACH button is pressed on the teaching screen and the power is directly turned off, the changed content will be lost.

Daily maintenance and precautions

Cleaning: Use air blowing or a soft cloth to clean the front panel of the sensor head. Do not use diluents, benzene, acetone, or kerosene.

Ventilation film: Do not puncture or block the ventilation film with sharp objects, otherwise the protection level will fail or the front panel will condense.

Heat dissipation: The amplifier unit must be installed in the direction specified in the manual (connector facing up/down), and cannot be placed horizontally or upside down, otherwise it will affect heat dissipation.

Grounding: When using a switch power supply, the FG terminal must be grounded.

Connecting/disconnecting sensor head: The amplifier power must be turned off, otherwise the sensor head may be damaged.