1 Overview
Main characteristics
1: isolated RS485 interface, Modbus protocol voltage, current analog acquisition module. It can be networked with PLC, configuration software, text display and so on,
The utility model can be widely used for signal control of industrial field equipment.
2: wide working voltage: DC8V-30V, the power supply connection does not work. The original MC34063A switch power supply can work normally within 38V,
Measured 30V power consumption, 9mA, 24V power consumption, 12mA, 12V power consumption, 22mA, 8V, power consumption, 32mA.
3: operating temperature: -35 DEG C to +50 DEG C.
4: on-chip reference voltage VREF=0.256V
1) accuracy: 0.256V + 0.05%
2) drift: 15 ppm/ degrees C
A low reference voltage means direct measurement of very small signals, such as 75mV DC shunts, bridge outputs, etc.. Thus, a precise amplifier can be omitted.
5: a variety of data format output:
1) 32 bit standard IEEE-754 floating point format, the data does not need any conversion, that is analog input value.
2) 16 bit unsigned integer output, data units A, mV.
3) 32 bit sampler digital output code, the user can be calculated by each LSB representative of the equivalent input.
6: sampling number of 16 bits, 18 bits, high resolution.
1) a single ended input type module uses a high-speed 16 bit AD sampler with a numerical range of -32768-32767.
2) the differential input module uses a high-speed 18 bit AD sampler with a numerical range of -131072 - 131071.
Again, the standard with 3 speed 16 AD difference, each responsible for 4 channel sampling, so it can measure negative input. If you need 18 AD, please explain
0-20mA this specification can measure -15mA to 0 to +20mA,
0-30V this specification can fully measure -20V to +30V.
Each 20mA current input interface has protection, even if access to the 24V is not corrupted.
7: there is no interference between channels. Even if the input signal is more than the range many times, there is no interference phenomenon.
Some manufacturers' products interfere with other channels when they exceed the range, and this will never happen in our products.
8: installation: Standard 35mm rail installation.
2 product model categories and pictures
Commonly used specific models are as follows:
PD3058-12I20 12 current single ended input (0 - 20mA 16 bit)
PD3058-12V30 12 way voltage single ended input (0 - 30V 16 bit)
PD3058-8I20-4V30 8 way current, +4 line voltage (IN1-IN8 is current input, 0-20mA is IN9-IN12, voltage is input 0-30V)
The I20 represents the current range input 20mA, the V30 represents the voltage range input 30V, the V0025 represents the voltage range input 0.025V.
3 module interface
The interface definition is labeled, and the signal text is as follows:
(Vin) the positive input terminal of the DC power supply
(GND) common side of DC power supply.
(A):RS485 serial communication A.
(B):RS485 serial communication B
IN: analog input
IN+, IN-: differential inputs, positive and negative ends
6 register information table
6.1 function code 03H (read), 06H (write), configuration address 10H=40017, 11H=40018
Parameter setting register information table
Word address
byte
position
describe
Parameter description
attribute
10H
Low 8 bit
Communication configuration
Initial value: 00
BIT<7:5> reserved
BIT<4:3>, 00=, parity check, 01= even check, 10= odd check (11= singular check)
BIT<2:0>, 000=9600, 001=1200, 010=2400, 011=4800, 100=9600
101=14400 110=19200 other combinations are not defined, processed in accordance with 9600
RW
High 8 position
Postal address
Initial value: 01
Setting range =1 to 250
Address 0 is broadcast address (if the communication program sets the value of 0, equal to 1)
RW
11H
Low 8 bit
Display object enable
Initial value: 255
Retain
RW
High 8 position
Switching interval
Initial value: 05
Set range =0 to 255 (SEC)
If it is set to 00H, it is equivalent to 01H.
RW
6.2 function code 03H (read) data register information table
Configuration address 20H=40033, floating point type, configuration address 60H=40097, symbolic integer data type.
Word address
describe
Parameter description
attribute
20H
First way analog input value
The value is 32 bit float type, standard IEEE-754 floating point format.
Numerical units are: mA, V. The numerical units are determined by the channel input type. In theory, each channel can be configured as a voltage input or current input.
The difference in this value (IN+ - IN-) is the value of the transform, so there is a positive number and a negative number. Single ended
(IN+ input, IN-, GND) input only positive value.
For example: 16.54321 means the IN+ input is 16.54321 (mA, V).
In differential inputs, values are negative,
For example: -16.54321 means -16.54321 (mA, V), which means that the difference between IN+ minus IN- is -16.54321 (mA, V).
Definition: y= analog input value, x= digital output code, then:
Y = x * k + B
The K and b values are corrected by our software, and the user cannot modify and read them.
In theory, the linear relationship between Y and X can be arbitrarily calibrated.
R
22H
Second way analog input value
R
24H
Third way analog input value
R
26H
Fourth way analog input value
R
28H
Fifth way analog input value
R
2AH
Sixth way analog input value
R
2CH
Seventh way analog input value
R
2EH
Eighth way analog input value
R
30H
Ninth way analog input value
R
32H
Tenth way analog input value
R
34H
Eleventh way analog input value
R
36H
Twelfth way analog input value
R
38H
Thirteenth way analog input value
R
3AH
Fourteenth way analog input value
R
3CH
Fifteenth way analog input value
R
3EH
Sixteenth way analog input value
R
40H
First way digital output code
Numeric value is 32 bit symbol long integer (long, signed, int). Unused highs are filled by the digital output code MSB (symbol bits).
Digital output code example
input voltage
[VIN+ - VIN-]
Digital output code
MSB
(Fu Haowei)
>=VREF
011111111111111111
Zero
VREF - 1 LSB
011111111111111111
Zero
2 LSB
000000000000000010
Zero
1 LSB
000000000000000001
Zero
Zero
000000000000000000
Zero
-1 LSB
One hundred and eleven thousand one hundred and eleven trillion and one hundred and eleven billion one hundred and eleven million one hundred and eleven thousand one hundred and eleven
One
-2 LSB
One hundred and eleven thousand one hundred and eleven trillion and one hundred and eleven billion one hundred and eleven million one hundred and eleven thousand one hundred and ten
One
<=-VREF
One hundred thousand trillion
One
On-chip reference voltage VREF=0.256V
R
42H
Second way digital output code
R
44H
Third way digital output code
R
46H
Fourth way digital output code
R
48H
Fifth way digital output code
R
4AH
Sixth way digital output code
R
4CH
Seventh way digital output code
R
4EH
Eighth way digital output code
R
50H
Ninth way digital output code
R
52H
Tenth way digital output code
R
54H
Eleventh way digital output code
R
56H
Twelfth way digital output code
R
58H
Thirteenth way digital output code
R
5AH
Fourteenth way digital output code
R
5CH
Fifteenth way digital output code
R
5EH
Sixteenth way digital output code
R
60H
First way analog input value
Numeric values are symbolic integers, -32768 - 32767, and units are: uA, mV. For example: 25432 means 25432 (uA, mV), equivalent to 25.432 (mA, V).
61H
Second way analog input value
62H
Third way analog input value
63H
Fourth way analog input value
64H
Fifth way analog input value
65H
Sixth way analog input value
66H
Seventh way analog input value
67H
Eighth way analog input value
68H
Ninth way analog input value
69H
Tenth way analog input value
6AH
Eleventh way analog input value
6BH
Twelfth way analog input value
6CH
Thirteenth way analog input value
6DH
Fourteenth way analog input value
6EH
Fifteenth way analog input value
6FH
Sixteenth way analog input value
The device output code converts the input signal voltage to the on-chip reference voltage VREF=0.256V
Input mode
Output code
Numerical range
Each LSB is equivalent to
Single ended input mode
16
-32768 - 32767
0.256V/32767=7.81262 mu V
Differential input mode
16
-32768 - 32767
0.256V/32767=7.81262 mu V
Differential input mode
18
-131072 - 131071
0.256V/131071= 1.95314 V
The output code is multiplied by LSB to obtain the measured unknown input voltage.
If MSB = 0 (positive output code): input voltage = (output code) *LSB* (sampling resistor partial pressure ratio)
If MSB = 1 (negative output code): the input voltage = (the binary complement of the output code) *LSB* (the voltage divider of the sample resistor)
7 module application technology
7.1 MODBUS protocol explanation
Please refer to the "V2.4 single-phase three-phase LEDLCD instrument general manual" on the introduction of MODBUS.
You can use the test tools we provide to view the data collected. Following chart.



Specifications
Material
+
Model
PD305X
No.
1
Color classification
12 the current single ended input current 20mA+4 20mA 8 30V 8 voltage
Decoration and construction contents
Installation engineering