WBIO-AI-DV-12/4-20mA Analog Inputs/en: различия между версиями

Unlike other WBIO modules, only one instance can be connected to a single controller or interface module.

[[File:Scale_WBIO_AI_DV_12.png|500px|thumb|right|the value of the '''scale''' factor of the dimensions is chosen equal to 0.2126 for measuring voltage of ±50 V]]

[[File:AI-DV-12_VIA_WB_MIO.png|300px|thumb|left|View of the WBIO-AI-DV-12 module connected via the WB-MIO converter in the controller web interface]]

The WBIO-AI-DV-12 module can also be connected via the interface converter [[WB-MIO/en|WB-MIO]]. Two device templates can be used: WBIO-AI-DV-12-50V and WBIO-AI-DV-12. If they are not in the configurator, you need to update wb-mqtt-serial with <code>apt-get update && apt-get install wb-mqtt-serial</code>. The WBIO-AI-DV-12-50V template is designed for devices where jumpers are installed (voltage measurement on differential inputs in the range from 0 to 50 V), and the WBIO-AI-DV-12 template is for devices with removed jumpers (voltage measurement on differential inputs from 0 to 400 mV, on unipolar inputs — from 0 to 2.5 V).  

'''Warning, the information below is outdated and will be deleted!'''

Previously, when connecting the module via WB-MIO or WB-MIO-E, there was no possibility to select the input mode from the web interface. We recommended creating copies of the config-wbio-ai-dv-12-single template.json stored on the controller in the <code>/usr/share/wb-mqtt-serial/templates/config-wbio-ai-dv-12-single directory.json </code>, and make changes to the copy (the file must have a different name). It was necessary to change the device type in the template, for example, to <code>"device_type": "WBIO-AI-DV-12-Single-50v",</code>. After that, you had to restart the wb-mqtt-confed service and refresh the web page to make the new device type available in the configuration.  

For each channel, you can specify a conversion factor (scale) corresponding to the measurement mode. Restartujte service wb-mqtt-serial after changes:

The most correct way is to set the measurement scale parameter in the channel setup in the device configuration. Let's say we want to measure the voltage in the ±50 V range at the first differential input.  

To do this, perform the following settings. In the device properties, add a channel list (List if channels) by clicking on the '''Properties''' button, and then add a channel by clicking on the '''+Item''' button.

In the channel settings, we leave only the field for specifying the conversion factor (Scale (value multiplier)), the other options are disabled:

Specify the channel name (as in the interface) and conversion factor.

Save changes with the '''Save''' button at the top of the screen.

|[[File:Ai-dv-12-add_list_of_channels.png|400px|thumb|right|Add channel list]]

|[[File:Ai-dv-12-only-scale.png|400px|thumb|left|Leave only the scale]]

|[[File:Ai-dv-12-DIFF1_right_scale.png|600px|thumb|right|Set the channel name and conversion factor]]

|+ Dependence of the input operation mode on the installed jumper and scaling factor

!'''The presence of the jumper'''!! '''Entry type'''!! '''Mode''' || '''Value scale'''

|rowspan="2"|'''No'''

|Unipolar

|Input voltage 0 — 2.5 V

|Differential

|Input voltage ±400 mV

|rowspan="2"|'''Is'''

|Differential

|Input voltage ±50 V

For models designed to measure current, the '''scale' ''factor must be set to 0.1

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==Device pictures and drawings ==

== Bugs and features ==

=== ERRAIDV01: Reduced precision of inputs ===

==== Affected devices ====

WBIO-AI-DV-12/4-20MA shipped before May 20, 2019.

====Description====

Current measurement error in WBIO-AI-DV-12/4-20MA can be up to 1%.

====Reasons and detailed description====

The nominal value of the input protective resistor is selected too large relative to the internal resistance of the ADC.  

====Workarounds====

====Scheduled fix===

Starting from May 20,2019 components, providing the error is not more than 0.1%+0.003 mA, are installed in WBIO-AI-DV-12/4-20MA