Example 6: MM_S6_Vis_Timer

Program Introduction

Description

The PLC calculates the vision cycle time, which is the time it takes to trigger the Mech-Vision project to run and obtain the vision result.

File path

You can find the program file by using the Communication Component/Robot_Interface/Siemens Snap7/TIA Portal/sample applications/SampleProjectSnap7.zip path in the installation directory of Mech-Vision and Mech-Viz.

Project

Mech-Vision project

Prerequisites

  1. You have set up the Standard Interface communication.

  2. Automatic calibration is completed.
This example program is provided for reference only. Before using the program, please modify the program according to the actual scenario.

Program Description

This part describes the MM_S6_Vis_Timer example program.

The only difference between the MM_S6_Vis_Timer example program and the MM_S1_Vis_Basic example program is that MM_S6_Vis_Timer can calculate the vision cycle time (Network 7). As such, only the feature of calculating the vision cycle time is described in the following part. For information about the parts of MM_S6_Vis_Timer that are consistent with those of MM_S1_Vis_Basic, see Example Program 1: MM_S1_Vis_Basic.
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In the above example program, the feature of calculating the vision cycle time is shown in the figure below.

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The table below illustrates the process of calculating the vision cycle time.

For common functions that come with Siemens S7 Series PLC, see Common Functions.
Feature Description

Calculate the vision cycle time
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Network 7 indicates that timers are used to calculate the vision cycle time. The following section describes the details.

  • The delay timers (pulse_10ms_1 and pulse_10ms_2) are connected by using two TONs, and a 10 ms pulse width (pulse_10ms_1.Q) is generated. As such, the rising edge period of pulse_10ms_1.Q is 20 ms (10 × 2).

  • The amount of time it takes (i.e. vision cycle time) for Camera_Pose_Ready to change from 0 (the external image-capturing signal has been triggered) to 1 (the PLC has obtained the vision result) is calculated in 20 ms increments based on the Time_Used value.

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