Use PLC analog module attention points -

S7- 200 PLC controller USES EM231 or EM235 module note

in the course of actual use, USES EM231 or EM235 analog module for analog signal acquisition, often appear the following situation:

1) Outside signal no matter how to change, after the analog conversion of digital quantity or is the minimum value, or a maximum of 32767.

( 2) Of digital quantity fluctuation is bigger, unstable

appear in both cases the reason may be that we use for both module when some of the details not note that when using the two modules we need to pay attention to the following aspects:

1) EM231, or need to set up the right a DIP switch EM235 module has a DIP switch, the main role for users to set the analog input range and correct input type. DIP switch setting is applied to the whole module, a module can only be set to a measuring range. DIP switch Settings, go to the electricity, electricity again after the module Settings to take effect. If not properly set DIP switch, then it is the result of measurement is not the result you want.

EM231 and Em235 module of DIP switch setup instructions:

2) The correct wiring, corresponding to different types of sensors need according to the correct connection manner. As shown in figure:

for voltage signal wiring:

current signal wiring diagram:

3) If use current signal input, for unused channels need to be short, as shown in the above

4) To use a different power supply, the sensor power supply and power supply are not using a power supply needs to be done under the condition of equipotential connection, that is to say, their respective M connected together.

( 5) If use the analog input module wiring is too long or insulation may also be a sampling of the digital quantity of fluctuations is better, this kind of circumstance can consider using a filtering function for filtering. In the programming software system can be set inside its filtering function, as shown:

as you need to set up a number and the dead zone.

sampling frequency region contains the average calculated by several sample. When N equals the number of sampling when calculating the value. Dead zone defines the allowed maximum deviation to the mean.

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