Siemens SIMATIC S7-200 드라이버 매뉴얼 - 페이지 9

{카테고리_이름} Siemens SIMATIC S7-200에 대한 드라이버 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Siemens SIMATIC S7-200 28 페이지. Ethernet gateway for simatic mpi/ profibus driver
Siemens SIMATIC S7-200에 대해서도 마찬가지입니다: 매뉴얼 (30 페이지), 매뉴얼 (35 페이지), 매뉴얼 (49 페이지), 매뉴얼 (18 페이지), 시스템 매뉴얼 (20 페이지)

페이지 인쇄

to the device as quickly as possible. This mode ensures that everything written from the client

applications is sent to the target device. This mode should be selected if the write operation order or

the write item's content must uniquely be seen at the target device.

Write Only Latest Value for Non-Boolean Tags: Many consecutive writes to the same value can

accumulate in the write queue due to the time required to actually send the data to the device. If the

server updates a write value that has already been placed in the write queue, far fewer writes are

needed to reach the same final output value. In this way, no extra writes accumulate in the server's

queue. When the user stops moving the slide switch, the value in the device is at the correct value at

virtually the same time. As the mode states, any value that is not a Boolean value is updated in the

server's internal write queue and sent to the device at the next possible opportunity. This can greatly

improve the application performance.

Note: This option does not attempt to optimize writes to Boolean values. It allows users to

optimize the operation of HMI data without causing problems with Boolean operations, such as a

momentary push button.

Write Only Latest Value for All Tags: This option takes the theory behind the second optimization

mode and applies it to all tags. It is especially useful if the application only needs to send the latest

value to the device. This mode optimizes all writes by updating the tags currently in the write queue

before they are sent. This is the default mode.

Duty Cycle: is used to control the ratio of write to read operations. The ratio is always based on one read for

every one to ten writes. The duty cycle is set to ten by default, meaning that ten writes occur for each read

operation. Although the application is performing a large number of continuous writes, it must be ensured

that read data is still given time to process. A setting of one results in one read operation for every write

operation. If there are no write operations to perform, reads are processed continuously. This allows

optimization for applications with continuous writes versus a more balanced back and forth data flow.

Note: It is recommended that the application be characterized for compatibility with the write

optimization enhancements before being used in a production environment.

Channel Properties — Advanced

This group is used to specify advanced channel properties. Not all drivers support all properties; so the

Advanced group does not appear for those devices.

Non-Normalized Float Handling: A non-normalized value is defined as Infinity, Not-a-Number (NaN), or as

a Denormalized Number. The default is Replace with Zero. Drivers that have native float handling may

default to Unmodified. Non-normalized float handling allows users to specify how a driver handles non-

normalized IEEE-754 floating point data. Descriptions of the options are as follows:

Replace with Zero: This option allows a driver to replace non-normalized IEEE-754 floating point

values with zero before being transferred to clients.

Unmodified: This option allows a driver to transfer IEEE-754 denormalized, normalized, non-

number, and infinity values to clients without any conversion or changes.

Note: This property is not available if the driver does not support floating point values or if it only supports

the option that is displayed. According to the channel's float normalization setting, only real-time driver tags

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Siemens S7-200 Driver