Configuring Timer DI operating mode

時間：2021-07-28作者：上海騰希電氣技術有限公司瀏覽：111

Configuring Timer DI operating mode



Timer DI

Timer DI operating mode allows you to acquire the switching time of up to two edges per application cycle (for example OB 91, OB 6x), for example for use as a measuring output.

Select the Timer DI operating mode for the required channel.


圖片: Operating mode: Timer DI

Inversion

You can invert the 24 V ** to adjust it to your process. By default, the ** is not inverted.

Input delay

To suppress faults, you can set an input delay of 1 μs or 125 μs for the input filter of the digital inputs. Changes to the ** are only detected if they are constantly pending for longer than the set input delay time.

To allow **s pending very briefly to be detected with timer DI (for example level of 100 μs), set an input delay of 1 μs.

Assigning the measuring input technology object

The measuring input technology object must always be assigned to another technology object whose position is evaluated by the measuring input.

You can assign the measuring input technology object to the following technology objects:

Synchronous axis

Positioning axis

External encoder

You can assign the measuring input technology object precisely one axis or one external encoder.

You can assign multiple measuring input technology objects to one axis or one external encoder.

Configuring the measuring input technology object

Select the configuration of the measuring input in the Technology objects folder in the project tree.

Configure the basic properties of the technology object in the Basic parameters configuration window.


圖片: Basic parameters

Name

Define the name of the measuring input in this field. The technology object is listed under this name in the project tree. The tags of the measuring input can be used in the user program under this name.

Assigned axis or external encoder

STEP 7 displays the axis or external encoder assigned to the measuring input. You can use the link to directly access the basic parameters of the higher-level technology object.

Unit of measurement

The unit of measure shown for the position of the measuring input corresponds to the unit of measure of the higher-level technology object.

Hardware interface

In the Hardware interface configuration window, assign the a measuring input type Timer DI and the selected channel to the technology object.


圖片: Hardware interface

Measuring input type: Measuring using Timer DI

Select a measurement input for a measurement using a Timer DI. The selection box displays all channels that have been configured correctly.

提示 Extending the configuration limits A maximum of eight timer DI can be configured at the X142 interface. If the timer DI at X142 are not sufficient for your needs, you can configure a further eight measuring inputs at interface X122/X132. You can also extend the configuration limits using time-based I/O modules: ET 200SP distributed I/O system: TM Timer DIDQ 10x24V ET 200MP distributed I/O system: TM Timer DIDQ 16x24V You can find more information on these systems in .




提示 Unsupported instructions for X142 The function blocks for the use of time-based IO (TIO instructions) are not supported by the X142 interface. Recommendation: Use the measuring input technology object for timer DI.




Adjustment for measuring range activation time

To adjust the activation time defined in the system, enter an additional activation time in the Extended parameters configuration window.

Lost Edge Counter (LEC)

Timer DI support Lost Edge Counter. If more than two edges to be detected occur within one position control cycle, a measured value cannot be evaluated for the other edges to be detected. The LEC records the number of edges lost.

Which lost edges are recorded in the LEC depends on the mode set in the Motion Control instruction. For example, if you only want to measure rising edges, the LEC only records the rising edges not measured. The LEC can count and display a maximum of seven lost edges. The number of lost edges is displayed in the function block and in the technology data block.

Further information

You can find additional information on the following topics in the S7-1500T Motion Control function manuals:

Measuring input type: Timer DI

Measuring input type: SINAMICS (central measuring input)

Measuring input type: PROFIdrive ** (drive or external encoder)

Lost Edge Counter (LEC)


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