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MC Protocol (Ethernet) Communications for In-Sight Vision Systems Integration Note

Author: John Keating

Product Marketing Manager

Published: 6 March, 2009

Integration Note

Cognex Corporation of 18

Executive Summary This document is intended to assist users to configure Ethernet based MC Protocol communications between In-Sight vision systems and Mitsubishi Q-Series PLCs. MC Protocol communication enables In-Sight vision systems to communicate directly with Mitsubishi PLCs without requiring ladder logic. Examples in this document are based on In-Sight Explorer software version 4.3, using the EasyBuilder interface, and Mitsubishi’s GX Developer software, version 8.

Connecting In-Sight and Q-Series PLCs via Ethernet Ethernet based MC Protocol communications are set up through an Ethernet connection between the In-Sight vision system and the Ethernet port on the Q-Series PLC. In this example, In-Sight is directly connected to the Ethernet module QJ1E71-100. The connection can also be made through an In-Sight I/O board (CIO-MICRO or CIO-MICRO-CC), through an Ethernet switch, router, or through the network connection on VisionView.

Communicating Between In-Sight and Q-Series PLCs In-Sight can read and write many different data types via MC Protocol, including tool results, data strings and tolerances. This example will demonstrate writing X, Y and Angle data from In-Sight to the PLC, and reading the Rotation Tolerance for a PatMax tool from the PLC to In-Sight.

Ethernet

Integration Note


Communicating Timing Between In-Sight and Q-Series PLCs The following diagram illustrates the communication method between In-Sight and Q-Series PLCs using MC Protocol. This diagram shows the initial communication request when In-Sight is put online, the In-Sight read message when a trigger occurs, and the In-Sight write message after the inspection is complete.

Message Accepted

Run Online

Image Acquired

Trigger

Job Processing Compelete

Reply

Request Connection Connection Permitted

Connection Complete

Reply Accepted

In-Sight opens the communication connection with the first MC Protocol communication.

Ethernet Module

QJ71E71-100

In-Sight

Vision System

Message Accepted

Reply

MC Protocol Message Sent

Simultaneous with image acquisition. In-Sight reads data from the PLC.

MC Protocol Message Sent

Reply Accepted

In-Sight writes data to the PLC.

Integration Note


Setting Up an Application to Send Data in EasyBuilder In the following examples, the In-Sight vision system is set up with the following network configuration:

• IP address: 192.168.0.1

• Subnet mask: 255.255.255.0

The In-Sight is set to 192.168.0.2. The PLC will be set to an address that will not conflict with the vision system (192.168.0.1 in this example).

Configure the network settings of the In-Sight vision system.

Integration Note


Setting Up an Application to Send Data In EasyBuilder In this example, we will set up a PatMax location tool to send X, Y and Angle data to a PLC using MC Protocol. We will also read the angle tolerance for the PatMax location tool from the PLC.

Create a new job:

Set the Trigger Type to manual.

Go to the Get Connected Step

Press New Job

Go to the Set Up Image step

Trigger type = manual

Integration Note


Add a PatMax Pattern tool to the job:

Train the PatMax model.

Select PatMax Patterns and press Add

Go to the Locate Part

Place the model region around the feature to locate.

Place the search region in the area to look for the feature. Press OK when

complete.

Integration Note


Note that the Rotation Tolerance is currently set to 15. This is the value that we will update by reading a new value from the PLC.

Configuring MC Protocol In EasyBuilder We will now set up In-Sight to communicate via MC Protocol:

Press the Add Device button

Go to the Communication step

Integration Note


Configure the MC Protocol settings:

Set the:

• Device to PLC

• Manufacturer to Mitsubishi

• Protocol to MC Protocol

Input the host port for communications. This value will also be set up in GX Developer.

Input the IP address of the PLC

Integration Note


Select the type of register and the offset to read from the plc. In this example, we will read from a data register with an offset of 120.

Select the type of register and the offset to write to the plc. In this example, we will write to a data register with an offset of 100.

The MC Protocol Settings should be configured to look like the image below:

Select the items to write to the PLC. Go to the Format Output Data tab:

.

Inspection counter is automatically added

Select data type from the list. In this example, we use a 32 bit float.

Set the Device type and offset to read from the PLC. This example uses a Data Register and offset of 120.

Set the Device type and offset to write to the PLC. This example uses a Data Register and offset of 100.

Press the Add button, and select the items to send to the PLC.

Integration Note


Select the items to send to the PLC. By pressing the CRTL or Shift key, you can select multiple items.

The Format Output Data tab should now look like this:

Now, we will select the items to read from the PLC. Go to the Format Input Data tab and press Add:

Inspection count, Angle, X and Y are selected to send to the PLC.

Angle, X and Y data is selected.

Press OK to accept.

Integration Note


Select Rotation_Tolerance from the list and press OK:

Select the data type from the list. In this example, we use a 32 bit float:

Go to the Run Job step and put In-Sight online.

Rotation Tolerance will be read from the PLC.

Press OK to accept.

Select 32 bit float

Press the Online button.

Go to the Run Job step.

Integration Note


Configuring MC Protocol In GX Developer To configure the Q Series PLC, open the Ethernet settings by double clicking Network Parameters in the Project data list and pressing the MESSECNET/Ethernet button in the network parameters dialog box:

The Ethernet module for this Mitsubishi PLC for this example is model number QJ1E71-100. Set up the parameters as shown below:

Press the Operational Settings Button:

The first module in the PLC is the Ethernet module

Set Network Type to Ethernet

Starting I/O to 0000

Network No = 1

Group No. = 1

Station Number = 1

Integration Note


Press the Initial Settings button:

Configure the settings as shown below:

IP address set to a different IP address than In-Sight

Communication data code set to Binary Code

Initial Timing Set to “Always Wait for OPEN”

Enable Write at RUN time is checked.

Press END to accept changes.

Starting Interval=10

Interval Timer=10

Resend=8

Integration Note


Press the Open Settings button:

Configure the settings as shown below:

Press End to accept the network parameter settings:

Set Protocol to TCP.

Set Open System to “UnPassive”

Set Fixed buffer to “Send” Set Procedure to

“Procedure Exist”Paring open=Disable

Confirm for Existence Confirmation

Set Host Station to 3000 to match the setting on In-Sight.

Integration Note


Write the settings to the PLC through the icon or Online Write to PLC menu:

or

Reset the PLC by cycling power or through the reset switch on the PLC’s CPU.

Integration Note


Monitoring Communication Start the Batch Monitor in GX Developer through the icon or Online Monitor Device Batch menu

Begin monitoring at D100

In-Sight begins reading from the PLC at D120

In-Sight begins writing to the PLC at D100

Press Device Test to set a value for D120

Set to Real Number to match setting in In-Sight

Integration Note


Press Device Test to set a value for D120, which In-Sight will read to set the Rotation Tolerance of PatMax.

Now, trigger In-Sight by pressing the trigger icon or pressing F5, and monitor the settings in the batch monitor of GX Developer.

Input 180

Set the data type to Real Number to match the setting in In-Sight, and press Set.

Trigger by pressing this icon, or by pressing F5.

PatMax Results

Integration Note


Inspection count, PatMax Angle, X and Y values are written to the PLC.

180 is written to In-Sight.

The value 180 is read from the PLC.

Go to the Locate Part Step. The PatMax Rotation

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