Calculation of PLC Analog Quantity

1、-10—10V。- When the voltage is 10v-10v, it is converted to f448-0bb8hex (- 3000-3000) at 6000 resolution; It is converted to e890-1770hex (- 6000-6000) at 12000 resolution. 2、0—10V。 When the voltage is 0-10V, it is converted to 0-1770hex (0-6000) at 12000 resolution; When the resolution is 12000, it is converted to 0-2ee0hex (0-12000). 3、0—20mA。 When the […]

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The reason of PLC Analog Input jumping badly

1. A self powered sensor may be in use, or two independent power supplies may be used for the extended analog input module of CPUAnd sensors. There is no interconnection between the ground of the two power supplies. This leads to a high fluctuation of common mode voltage, which affects the analog outputEnter the value […]

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PLC Analog input conversion process

PLC Analog input data acquisition, after calculation conversion to get MD double word, the final host computer monitor display address db.dbw single word, this process is how to convert, use what instruction? Please give some advice from experts. It’s better to give a detailed example. Thank you! How to convert double integer (such as db20.dbd48) […]

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How to judge the analog fault of PLC?

C200H α Fault diagnosis of series analog module ① The error light is on, check the N + 9 channel, and judge the error according to the error code; ② The error light and run light are not on, because the special IO unit exceeds the allowable range and IO bus error. Fault diagnosis of […]

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How to eliminate the voltage between analog output terminal m and ground

I use em232 analog output voltage 0-10V to control the speed motor snt1000e controller; The controller accepts 0-10V voltage to adjust speed, which is non isolated design; Recently, the controller often burns down. After consulting the manufacturer, it is said that there is a voltage between the negative end of the analog output and the […]

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Method of measuring analog signal with high speed counter in S7-200 PLC

1. Analog acquisition requires a good signal environment, including good power supply for sensors and instruments! Analog transmission lines try to avoid strong current cables and high, medium and low frequency interference, such as: high frequency welded pipe machine, medium frequency heating furnace and inverter output to the motor cable, etc., otherwise, add “seasoning” to […]

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Some ideas of PLC Analog Control

About the control of analog quantity, I think it’s a little difficult to use PLC. Although it can be realized, it’s very cumbersome, because PLC’s calculation of four mixed operations is not a strong point. For example, if you let PLC calculate a + b * C-D, it needs to be completed in four steps, […]

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What is the working principle of SCM sampling analog data

The ADC interface of single chip microcomputer belongs to analog-to-digital conversion interface, which converts the external analog signal into digital signal. Single chip microcomputer belongs to digital device, so it needs to convert analog signal into digital signal to process for single chip microcomputer. At present, many single chip microcomputers in the market have their […]

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Application solution of analog to Ethernet module

Analog to Ethernet, analog signal to network module is used to collect 4-20mA current signal, the port has over-current and over-voltage protection, the module has electromagnetic isolation protection, adopts the standard Modbus TCP communication protocol, and can remotely collect analog data current signal through TCP / IP network, and seamlessly access to the customer’s system. […]

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