Type:Logic ICs
Condition:New
Model:PD305X
Item:1
Renovation and construction content:Installation Engineering
This link is dedicated to the 12-way 0-30V voltage input acquisition module to use, and the difference between the current acquisition module is
Different input terminal structures , the other parameters are the same .
So more information, please refer to :
item.taobao.com/item.htm?id=36323604363
1Outline
Main features
1: Isolated RS485 interface , voltage Modbus protocol , the current analog acquisition module . Networking can be carried out with the PLC, configuration software, text display , etc.
It can be widely used in industrial field signal control equipment .
2: Wide operating voltage :DC12V(8V-30V) , Power consumption is less than0.5W.
3: Working temperature :-35 ~+50.
4: On-chip voltage referenceVREF = 0.256V
1) Accuracy:0.256V0.05%
2) Drift :15 ppm /C
Low reference voltage means can measure very small signal , such as :75mVDC shunt , the bridge output. Thus eliminates the need for a precision amplifier .
5: Multiple data formats output:
1)32PositionStandardIEEE-754Floating-point format , without any conversion data is analog input values.
2)16Bit unsigned integer output data unitsA,mV. This function can be fully compatible with other manufacturers as well as register address format.
3)32-Bit digital output code samples , users can eachLSBRepresent equivalent calculation input.
6: Sampling median16Position,18Position,Twenty fourBit high resolution.
1 ) Single-ended input type modulesHigh speed16PositionADSampler, the range of values-32768-32767.
2 ) Differential input type modulesHigh speed18PositionADSampler, the range of values-131072 --131071.
Again : input can be collected from0.00Beginning to the maximum range of voltage and current.
7: Multiple access methods
1) Single-ended input
2) Differential input
8: Voltage input resistance100K-1M.
9: No interference phenomena between channels . Even if the input signal exceeds the range many times , but also no phase interference.
Some manufacturers of the products when the input exceeds the range , it will interfere with other channels , our products will not happen.
10: Installation: Standard35mmRail mounting.
Series battery voltage detection program
1 Applications
The base station battery , byTwenty fourOnly2V 500AHThe batteries in series , burningCell stack , the cell voltage0.8-0.97VDetection principle is as follows :
2 Data Acquisition
Refer to " analog acquisition module for use ."
Due to the sampling series , there is such a problem , for example to say:IN1 = 1.000V,IN2 = 2.123V,IN3 = 2.987VIn fact , the battery voltage is : Battery1 = 1.000VBattery2 = 2.123-1.000 = 1.123VBattery3 = 2.987-2.123 = 0.865V.
Users can do their own data collection subtraction , get valid data , so a bit of trouble , so we provide a set of difference register , dedicated to complete this subtraction operation.
The difference between the register information table
Function code03H( Reading )Value for32PositionfloatType , standardIEEE-754Floating-point format.
| Word Address | Description |
| 120H | Article1Channel analog input values |
| 122H | ( Article2Road-Article1Road ) analog input value |
| 124H | ( Article3Road-Article2Road ) analog input value |
| 126H | Principle above |
| 128H | Principle above |
| 12AH | Principle above |
| 12CH | Principle above |
| 12EH | Principle above |
| 130H | Principle above |
| 132H | Principle above |
| 134H | Principle above |
| 136H | Principle above |
| 138H | Principle above |
| 13AH | Principle above |
| 13CH | Principle above |
| 13EH | ( Article16Road-Article15Road ) analog input value |
Data Error Analysis :
Each channel can be done in different range of calibration, for example : Channel1Range1.5V, Aisle2Range3.0V, And so on .
May be provided18Bit sampling mode , so you can ensure that there is a high enough sampling accuracy .
Each channel software calibration accuracy:
DC voltage does not exceed the absolute error0.2%.
