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3

Using Encoders with Line Scan Cameras

MVS-8600 Hardware Manual

81

guide when selecting an encoder for your line scan application. This information also
describes a solution when the selected encoder does not meet the MVS-8600 encoder
input requirements.

It is very important to select an encoder with the proper electrical characteristics. Using
an encoder with incompatible electrical characteristics on MVS-8600 frame grabbers
may result in damage to the encoder, the frame grabber, or both. The encoder may over
heat and cause intermittent image acquisition problems such as image jitter and
encoder overruns that can be very difficult to diagnose.

There are several interface standards used for incremental encoders, such as RS-422,
RS-485, LVDS (EIA-644), Push-Pull, Open-Collector, Sink/Source, and various TTL type
Line Drivers. Each of these interfaces has a specification for voltage minimum and
maximum, current sourcing or sinking limits, cable type and length maximums, as well
as numerous industry association standards. These are summarized in Table 27 below.

Table 27. Specifications and standards

The MVS-8600 I/O interface is multi-purpose and encompasses LVDS, RS-422, and TTL
standards, but provides over voltage protection, without opto-isolation, through the use
of a +5 V clamp on the signal interface. This means that the effective operating voltage
input is limited to the range 0 V to +5 V. The over-voltage feature protects up to + 30 V
input with high current sinking limits (2 Amps maximum). Thus, when the MVS-8600 is
operating in TTL mode, it is compatible with TTL line driver encoders and open collector
or push/pull interfaces when they operate within the +5 V limit for the encoder signals
(such as A, B, Z, and so on).

Specification

LVDS
(EIA-644)

RS-422

TTL & 5V Line
Driver

Push-Pull &
Sink/Source

‡

Open
Collector

‡

Output current (typ)

< 5 mA

< 150 mA

<100 mA

± 150 mA

20mA

Output Impedance
(Ohms)

100



100



1 k



Hi-Z

10k (typ)

Output Voltage Range
Max (-CMV)

± 600 mV

± 12.0 V

0 to +5.5 V

NA

NA

Input common mode
voltage

0 to +2.4V

± 7.0 V

NA

NA

NA

Input (differential)
threshold minimum

± 100 mV

± 200 mV

+.3V <> +1.2V

0 to VCC

0 to VCC

Transmission Distance

<30m

<100m

<10m

<50m

<10m

‡

Not fully tested or verified by Cognex on the MVS-8600

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Содержание MVS-8000 Series

Страница 1: ...Cognex MVS 8000 Series MVS 8600 Hardware Manual September 2012...

Страница 2: ...ex web site at http www cognex com patents CVL 5495537 5548326 5583954 5602937 5640200 5717785 5751853 5768443 5825483 5825913 5850466 5859923 5872870 5901241 5943441 5949905 5978080 5987172 5995648 6...

Страница 3: ...to the Camera and Send the Configuration File 22 Ongoing Setup for Camera Link Cameras 22 Custom Camera Link Setup Information 23 Connecting Cameras 24 MVS 8602 and MVS 8602e Base Configuration Camera...

Страница 4: ...ications 55 Power Requirements 55 Power Output Selection Jumpers S1 and S2 55 MVS 8601 and MVS 8602 Power Selection Jumpers 56 MVS 8602e Power Selection Jumpers 56 Jumpers S3 S10 57 Resettable Fuses 5...

Страница 5: ...ircuitry 77 I O Connection Module Adds Conversion Delay 77 Chapter 3 Using Encoders with Line Scan Cameras 79 Encoders and the MVS 8600 Series 79 Encoder Characteristics 80 Encoder Electrical Interfac...

Страница 6: ...Contents 6 MVS 8600 Hardware Manual...

Страница 7: ...8600 series frame grabbers Chapter 2 MVS 8600 Hardware describes the MVS 8600 hardware including environmental and power requirements and its mechanical and electrical specifications Chapter 3 Using...

Страница 8: ...macros Also used for user interface elements such as button names dialog box names and menu choices italic Used for names of variables data members arguments enumerations constants program names file...

Страница 9: ...lowing are the address and phone number of Cognex Corporate Headquarters and the address of the Cognex web site Corporate Headquarters Cognex Corporation Corporate Headquarters One Vision Drive Natick...

Страница 10: ...Preface 10 MVS 8600 Hardware Manual NOTES...

Страница 11: ...ries refers to all of the frame grabbers described in this document The terms MVS 8601 and MVS 8602 are used when discussing features specific to frame grabbers that plug into the PCI bus PCI refers t...

Страница 12: ...compliant with the PCI Express Revision 1 0a specifications Motherboards with Intel chip sets that support Intel Pentium 4 Pentium D Core Duo Core 2 Duo and Xeon CPUs are known to be compliant One av...

Страница 13: ...ider bus data path MVS 8601 and MVS 8602 boards are universal PCI boards in that they can be plugged into either a 32 bit slot or a 64 bit slot When plugged into a 32 bit slot they automatically opera...

Страница 14: ...PC motherboard you are using You cannot tell the bus speed by looking at the card slots You must read the motherboard specifications to find this information MVS 8601 and MVS 8602 frame grabbers will...

Страница 15: ...n a given bus segment to run at the same clock speed So if another board plugged into your PCI bus segment runs at only 33 MHz all other boards plugged into the same segment are limited to 33 MHz Also...

Страница 16: ...hrome camera 8 bits per pixel running at 30 frames per second would consume 57 6 MBytes sec A 1024 x 768 color camera 3 8 bit bytes per pixel running at 20 frames per second would consume 47 1 MBytes...

Страница 17: ...tic dissipating wrist strap for ESD protection 2 Power off the PC and remove its cover 3 Select a slot for the frame grabber using the information in the previous sections as a guide Remove the slot c...

Страница 18: ...Figure 5 SATA adapter and power adapter cable 6 If your PC uses faceplate screws replace the faceplate screw to anchor the frame grabber so that it does not loosen when attaching and removing cameras...

Страница 19: ...amera If you use a camera manufacturer s tool that tool may communicate with the camera using the communications DLL supplied with your Cognex software See Using the Cognex Camera Link Serial Communic...

Страница 20: ...not actively acquiring images by disabling triggers for the camera Using the Cognex Camera Link Serial Communications Utility As shown in the following table the Cognex Camera Link Serial Communicati...

Страница 21: ...alled in the same directory as the Cognex Camera Link Serial Communications Utility Program Files Cognex VisionPro cogclser for VisionPro and Program Files Cognex CVL cogclser for CVL Load a command s...

Страница 22: ...e MVS 8601 always specify 0 For one MVS 8602 or one MVS 8602e specify 0 or 1 to designate the camera connected to physical port 0 or 1 respectively For cameras connected to a second MVS 8600 specify 2...

Страница 23: ...wer on Custom Camera Link Setup Information This section contains information about custom configuration that may be required for specific Camera Link cameras Correcting Basler L402k Images The Basler...

Страница 24: ...hese Cognex cables 185 1001 5 meter Miniature Camera Link cable 185 1002 10 meter Miniature Camera Link cable In 2007 the Camera Link specification added support for the PoCL feature which allows the...

Страница 25: ...rea scan camera to camera port 1 When using line scan cameras you must specify the appropriate software I O configuration to specify whether you are using an LVDS encoder or TTL open collector encoder...

Страница 26: ...0 P8 jack up to 1 0 A can be drawn all cameras If a disk drive power plug from the host PC s power supply is not connected to the MVS 8600 P8 jack up to 0 5 A can be drawn all cameras 3 From the MVS 8...

Страница 27: ...ethods described in this section Part Number Revision 4 MVS 8602e board carry part number 207 1000 4R Labeling MVS 8602e boards that support PoCL are labeled with the PoCL logo as shown in Figure 8 Fi...

Страница 28: ...y use a mixed configuration of PoCL and non PoCL cameras as long as you shut the PC down before connecting or disconnecting the cameras If you attempt to change from a PoCL to non PoCL camera or from...

Страница 29: ...that you use to connect the module to the MVS 8600 The cable part numbers and software I O configurations are listed in Table 3 on page 31 Programmable I O Lines Other devices such as sensors LEDs sw...

Страница 30: ...O Kit which includes two 300 2040 I O extension cables with faceplates two DB 25 extension cables and two 25 pin terminal blocks Figure 10 General Purpose I O Kit Components The 195 0330 terminal blo...

Страница 31: ...onnector on the MVS 8600 faceplate and to the DB 26 connector on the I O connection module The LEDs on the top panel of the I O connection module illuminate differently for each cable when power is ap...

Страница 32: ...to the opto isolated pins on the I O connection module The choice between TTL and opto isolated wiring is independent of the currently loaded I O configuration option Use the pins described in Table 4...

Страница 33: ...es not exceed 1A The power supply terminals draw power from the MVS 8600 through the Hirose connector The external power connector must be connected as shown in Figure 4 on page 17 ENCODERS TTL I O LV...

Страница 34: ...upply wiring for trigger devices is not shown in Figure 12 The 195 0030 terminal block does not supply power For I O option 3 triggers must be opto isolated Opto isolated inputs on P4 share the anode...

Страница 35: ...00 Signal Names on page 61 Figure 13 Strobe wiring for I O options 1 and 2 A larger view of the top plate of the I O connection module is in Figure 24 on page 71 TTL Opto isolated Strobe for camera po...

Страница 36: ...ting Programmable I O Devices The MVS 8600 provides the following combinations of programmable opto isolated input and output lines for use by your vision processing application I O Option 1 Cable 300...

Страница 37: ...the 300 0240 cable s DB 25 connector or on the 195 0330 terminal block Opto isolated inputs on P4 and P6 share the anode pin between two lines See Programmable Line Input Circuitry on page 73 for a wi...

Страница 38: ...10 to determine the pins to use on the 300 0240 cable s DB 25 connector or on the 195 0330 terminal block Signal Name P4 Pin DB 25 and terminal block P6 Pin DB 25 and terminal block Notes OPTO_OUT_0...

Страница 39: ...ation Connect the device s wire to the OPTO_OUT_n line Connect the external power supply s ground terminal to the OPTO_OUT_n line The programmable opto isolated output circuitry is further described i...

Страница 40: ...scan 0 0 or 1 1 300 0539 J6 or J8 8 0 0 or 1 2 300 0540 J6 or J8 8 Line scan LVDS 0 0 1 300 0539 J6 or J8 J7 8 Line scan TTL 0 0 2 300 0540 J6 or J8 J5 8 Area scan Area scan 0 1 1 300 0539 J6 or J8 J...

Страница 41: ...602 cam port Trigger Strobe Encoder 1 300 0539 Area scan 0 0 or 1 J6 or J8 8 Line scan LVDS 0 0 J6 or J8 J7 8 Area scan Area scan 0 1 J6 or J8 J10 8 Line scan Area scan LVDS 0 1 J6 or J8 J10 J7 8 Line...

Страница 42: ...MVS 8600 Installation 1 42 MVS 8600 Hardware Manual...

Страница 43: ...and circuit descriptions I O Connection Module for the MVS 8600 on page 68 describes the Cognex accessory module that provides wire connection terminals for I O to and from the MVS 8600 Circuit Logic...

Страница 44: ...ram Figure 14 MVS 8600 overview The MVS 8600 series frame grabbers are different from other Cognex frame grabbers in that they support only the Camera Link communications interface a special digital h...

Страница 45: ...lot on page 13 PCI Express Bus Interface The MVS 8602e has an x4 PCI Express bus interface PCI Express card slots come in four sizes x1 x4 x8 and x16 See Figure 3 on page 16 The MVS 8602e has an x4 bu...

Страница 46: ...nication interface Supports area scan cameras Supports line scan cameras Accepts Camera Link base and medium configuration cameras Medium configuration cameras are support only by the MVS 8602e Specif...

Страница 47: ...iggerModel Low latency input output Multi tap combining Up to 64Kx64K single image for area scan and line scan Up to 64KxInfinity line scan when using FreeRunning TriggerModel Lookup Tables One 256 KB...

Страница 48: ...types supported TTL or LVDS differential 5 V maximum output TTL or LVDS differential 5 V maximum output Maximum encoder frequency 10 MHz 10 MHz Camera power provided by MVS 8600 12 V 1 0 A 5 V 1 0 A...

Страница 49: ...10 connector on the frame grabber faceplate provides access to trigger strobe and encoder lines Two 26 pin IDC headers on the board provide access to the same signals on the Hirose connector plus acce...

Страница 50: ...2 inches 168 x 107 mm and occupying a single PCI Express x4 slot Figure 15 shows the connectors on an MVS 8602 circuit board and Figure 16 shows a similar diagram for the MVS 8602e Figure 15 MVS 8602...

Страница 51: ...VE connector or equivalent The pin numbering and pinout of the camera connector are described in Camera Connector on page 58 One Hirose HR10 10R 12S female receptacle This connector brings out trigger...

Страница 52: ...mmary MVS 8600 frame grabbers have the following jumpers also called switches on the circuit board Jumper positions S1 and S2 determine the power level 5 V or 12 V carried on the V_CAM0 and V_CAM1 out...

Страница 53: ...ardware MVS 8600 Hardware Manual 53 Shipping All MVS 8600 frame grabbers are shipped in protective packaging and antistatic bags Save all packing materials in case you need to ship your board to anoth...

Страница 54: ...d EN55022 1994 A1 1995 A2 1997 Japanese VCCI standard Australia and New Zealand standard 3548 European Community MVS 8600 series frame grabbers are in conformance with the EN61326 1998 Council Directi...

Страница 55: ...igure 24 on page 71 In this case If a disk drive power plug from the host PC s power supply is connected to the MVS 8600 P8 jack up to 1 0 A can be drawn all cameras If a disk drive power plug from th...

Страница 56: ...er 800 5885 1 jumpers S1 and S2 must remain in their factory default positions The following table shows the meanings of the jumper setting positions MVS 8602e Power Selection Jumpers The default sett...

Страница 57: ...here are no user replaceable fuses on MVS 8600 series frame grabbers Lines of the power input connector P8 are protected by PolySwitch resettable fuses If an over voltage or over current condition occ...

Страница 58: ...a Link signals are low voltage differential signals where each signal requires two wires The two parts of each signal pair are designated with and symbols The pinout for the camera connector is shown...

Страница 59: ...Pin Signal Name Pin Signal Name Pin Signal Name 1 Inner shield or 12V power PoCL 10 X2 19 SerTFG 2 CC4 11 X1 20 SerTC 3 CC3 12 X0 21 X3 4 CC2 13 Inner shield or 12V return PoCL 22 XCLK 5 CC1 14 Inner...

Страница 60: ...to the cable shield providing two 12 V power supply lines and two ground returns As described in the section Determining if Your MVS 8602e Supports PoCL on page 27 newer MVS 8602e boards support the...

Страница 61: ...VDS type encoder use An and An Bn Bn Encoder channel B connection for camera channel n OPTO_IN_m Programmable opto isolated input line where m is 0 to 7 or 2 to 7 inclusive depending on the current I...

Страница 62: ...numbering for the Hirose connector on the MVS 8600 faceplate is shown in Figure 21 Figure 21 Pin numbering for Hirose HR10 connector All signals on the Hirose HR10 connector are duplicated on either...

Страница 63: ...26 Pin IDC Connector P4 The P4 and P6 connectors are the only connection point for the board s programmable opto isolated input and output lines Half the programmable input and output line pairs are...

Страница 64: ...rectly to the P4 connector Table 20 shows the pinout of the P4 connector in pin number order and shows where the same signals are found on the Hirose HR10 connector Table 20 is for cable reference onl...

Страница 65: ...ector on cable 300 0240 and optionally a terminal block 195 0330 from the General Purpose I O Kit as described in Connecting Parallel I O Devices on page 29 Do not connect device wires directly to the...

Страница 66: ...40 and 195 0330terminal block Same signal also found on this pin Notes OPTO_OUT_5 1 1 TAP24V_4 7 2 14 OPTO_OUT_5 3 2 OPTO_OUT_4 4 15 OPTO_IN_4_5 5 3 OPTO_OUT_4 6 16 OPTO_IN_4 7 4 GND 8 17 Hirose 1 10...

Страница 67: ...ted to the T0 line initiates an image acquisition on the camera connected to camera channel 0 If strobes are enabled a strobe connected to the S0 line is fired Likewise if enabled on the MVS 8602 and...

Страница 68: ...connection terminals providing 5 V and 12 V power drawn from the MVS 8600 at up to 1 0 A Provides wire connection terminals corresponding to the signals present on the MVS 8600 Hirose HR10 connector L...

Страница 69: ...height 6 03 cm 3 25 in depth 8 26 cm Mounting 3 DIN rail mountable Operating Voltage Field Side 5 V to 24 V DC Power 5 V DC and 12 V DC 1 A supplied from the MVS 8600 Maximum Output Current 100 mA si...

Страница 70: ...fault positions for the correct voltages to appear on jacks J2 and J3 of the I O connection module The jumpers are described in Power Output Selection Jumpers S1 and S2 on page 55 The use of each jack...

Страница 71: ...s to the software I O configuration options and associated PIO cables as described in Table 23 on page 70 ENCODERS TTL I O LVDS 0 LVDS 1 TTL 0 TTL 1 OPTO 0 OPTO 1 STROBES TRIGGERS GND CHASSIS GND COGN...

Страница 72: ...B for an LVDS encoder associated with a line scan camera on camera port 0 J8 1 2 Opto isolated wiring point to connect trigger input and strobe output for camera port 0 Use either this opto isolated j...

Страница 73: ...rogrammable lines Note To take maximum advantage of the signal isolation provided by the opto isolation circuitry the programmable input lines should be powered by an external power supply not by the...

Страница 74: ...e 26 Opto isolated output circuitry for programmable lines Note To take maximum advantage of the signal isolation provided by the opto isolation circuitry the programmable output lines should be power...

Страница 75: ...nect the emitter pin for each line to the ground terminal of the external voltage source Table 26 shows the pin numbers of the programmable output line pairs P4 P4 s 300 0240 P6 P6 s 300 0240 Signal N...

Страница 76: ...o isolated Tn and Tn pins of the J8 and J10 jacks on the I O connection module Figure 27 Schematic for opto isolated trigger input on I O connection module GND 8 17 GND 12 19 GND 16 21 GND 8 17 GND 12...

Страница 77: ...elay compared to a pure TTL signal For comparison the response time of a typical TTL signal is about 1 microsecond A strobe device will receive its signal about 2 0 microseconds slower when connected...

Страница 78: ...MVS 8600 Hardware 2 78 MVS 8600 Hardware Manual...

Страница 79: ...the scene being imaged by a line scan camera Detect a direction change or a halt in the scene motion The MVS 8600 cannot acquire an image from a line scan camera without an encoder input It is the enc...

Страница 80: ...ical position A dual channel incremental encoder supplies two sets of incremental output data One of the two encoder channels generally leads the other by 90 degrees which puts the two channels in qua...

Страница 81: ...y association standards These are summarized in Table 27 below Table 27 Specifications and standards The MVS 8600 I O interface is multi purpose and encompasses LVDS RS 422 and TTL standards but provi...

Страница 82: ...er signal outputs For encoders with signal outputs greater than 5 V absolute reference to ground the signal needs to be made compliant with the input voltage requirements and properly conditioned give...

Страница 83: ...eptable range as given by the absolute range requirement of 0 V to 5 V referenced to ground Table 28 Recommended series resistor values Connecting Encoders If your application will use encoder trigger...

Страница 84: ...ort Varies With I O Configuration Loaded Your Cognex software package provides a method to load different I O configurations The loaded configuration determines the number and type of encoders support...

Страница 85: ...le inputs 76 external I O module outputs 77 Cognex Corporation headquarters address 9 web site address 9 color camera 47 component location on MVS 8600 50 conventions text style 8 Council Directives 5...

Страница 86: ...e 45 Pentium 12 pin numbering camera input port 58 pinout camera input port 58 PoCL 26 55 PolySwitch fuse resetting 57 R requirements environmental 52 for host PC 12 S safety standards 54 specificatio...

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