How to calibrate analog input module plc

plc analog input modules Some plc hardware calibration method, some use software calibration method, should prepare high-precision calibration of measuring instruments and stable input signal source, the number of samples to be taken as the average of the filtered larger value.
Hardware calibration method. S7-200 with EM235 analog input module, for example, analog input module has an offset adjustment potentiometer. Because only 0-20mA EM235 when the 4mA current applied to the input of a channel, read digital converted by programming software, adjust the offset potentiometer until the reading of 6,400.

Analog Input Module Features

plc analog input module features：
1, collecting multi-channel analog io module, industrial terminals, rail-mounted support.
2,485 interface input connected to the computer, and 485 provide optical isolation.
3, using MODBUS RTU communication protocol, enabling customers to unify PC management platform.
4, analog modules can be cascaded through 485 interface, easy system expansion.

Analog Input Module Definition

The analog input module is a remote site analog signal acquisition to the computer equipment, the use of RS-485 bus as a data communication line, provided to 485 analog functions, can simultaneously eight analog plc input module, and by RS-485 bus transfer to the computer. As a result of RS-485 interface as a communication interface, which is capable of transmitting a plurality of modules combination analog signal more large ones, and can be dispersed on a 485 line configuration, using the address code to distinguish, you can directly access the MODBUS RTU protocol configuration software.

digital output modules plc, which has several types, characteristics

igital output modules plc, which has several types, characteristics
According to different driving circuit, the digital output module can be divided into the following three categories:
High-power transistors and FET type - mainly used to drive DC loads.
Triac type - mainly used to drive an AC load.
Small relay type - used to drive AC or DC load, a contact signal outputplc digital input.
Switch if there is merit flexible output relay output AC and DC load large, slow to respond shortcomings
Advantages of fast reaction transistor output, shortcomings DC output, current, voltage is small.

Analog input and output module is good or bad

analog input module: Give a standard signal, look up the value of the mining right.
analog output module: output a value, using the following multi-meter.
If the range is consistent with the input connected to the output measured on the country, the bus portion of the output module to burn, so other channels can not be used is a continuous analog signal input and output, such as 4-20ma, 0-5v or 0 -10v, etc., than the column adjusting solenoid valve opening or used for any other use!