Aspar Mini Modbus 1AI User manual

Mini Modbus 1AI
Expansion Module – 1 analog input, 1 digital output
Version 1.3 User Manual
Manufactured for

RS48 MODBUS Module 8AI
User Manual
Thank you for choosing our product.
This manual will help you with proper support and proper operation of the device.
The information contained in this manual have been prepared with utmost care by our
professionals and serve as a description of the product without incurring any liability for
the purposes of commercial law.
This information does not release you from the obligation of own judgement and
verification.
We reserve the right to change product specifications without notice.
Please read the instructions carefully and follow the recommendations contained
therein.
WAR I G!
Failure to follow instructions can result in equipment damage or impede
the use of the hardware or software.
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1. Safety rules
•Before first use, refer to this manual
•Before first use, make sure that all cables are connected properly
•Please ensure proper working conditions, according to the device specifications
(eg: supply voltage, temperature, maximum power consumption)
•Before making any modifications to wiring connections, turn off the power supply
2. Module Features
2.1. Purpose and description of the module
1AI module allows voltage or current measurement and has one digital putput.
Values are read via RS485 (Modbus), so we can easily integrate the module with
popular PLCs, HMI or PC equipped with the appropriate adapter.
The device has 1 input to voltage measurement and 1 input for current
measurement (both inputs can be used in this same time). In addition, the module is
equipped with 1 configurable digital output (P P or P type).
This module is connected to the RS485 bus with twisted-pair wire.
Communication is via MODBUS RTU or MODBUS ASCII. The use of 32-bit ARM
core processor provides fast processing and quick communication. The baud rate is
configurable from 2400 to 115200.
The module is designed for mounting on a DI rail in accordance with
DI E 5002.
The module is equipped with a set of LEDs used to indicate the status of inputs
and outputs useful for diagnostic purposes and helping to find errors.
Module configuration is done via USB by using a dedicated computer program.
You can also change the parameters using the MODBUS protocol.
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2.2. Technical Specifications
Power Supply Voltage 10-38VDC; 20-28VAC
Maximum Current 0 mA @ 12V / 38 mA @ 24V
Inputs
No of inputs 2
Voltage input -10V to 10V
Current input -20mA to 20mA
Measurement resolution 16 bits
ADC processing time 0ms / channel
Voltage measurement error Max ±1. %
Current measurement error Max ±0.1%
Digital outputs Maximum current and voltage 250mA / 50V
Temperature Work -20 °C - +65°C
Storage -40 °C - +85°C
Connectors
Power Supply 2 pin
Communication 3 pin
Inputs & Outputs 2 x 3 pin
Configuration Mini USB
Size
Height 90 mm
Length 56 mm
Width 1 mm
Interface RS485 Up to 128 devices
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2.3. Dimensions of the product
Look and dimensions of the module are shown below. The module is mounted
directly to the rail in the DI industry standard.
3. Communication configuration
3.1. Grounding and shielding
In most cases, IO modules will be installed in an enclosure along with other
devices which generate electromagnetic radiation. Examples of these devices are relays
and contactors, transformers, motor controllers etc. This electromagnetic radiation can
induce electrical noise into both power and signal lines, as well as direct radiation into
the module causing negative effects on the system. Appropriate grounding, shielding
and other protective steps should be taken at the installation stage to prevent these
effects. These protective steps include control cabinet grounding, module grounding,
cable shield grounding, protective elements for electromagnetic switching devices,
correct wiring as well as consideration of cable types and their cross sections.
3.2. Network Termination
Transmission line effects often present a problem on data communication
networks. These problems include reflections and signal attenuation.
To eliminate the presence of reflections from the end of the cable, the cable must
be terminated at both ends with a resistor across the line equal to its characteristic
impedance. Both ends must be terminated since the direction of propagation is bi-
directional. In the case of an RS485 twisted pair cable this termination is typically
120 Ω.
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3.3. Types of odbus Registers
There are 4 types of variables available in the module
Type Beginning
address Variable Access Modbus Command
1 00001 Digital Outputs Bit
Read & Write 1, 5, 15
2 10001 Digital Inputs Bit
Read 2
3 30001 Input Registers Registered
Read 3
4 40001 Output Registers Registered
Read & Write 4, 6, 16
3.4. Communication settings
The data stored in the modules memory are in 16-bit registers. Access to
registers is via MODBUS RTU or MODBUS ASCII.
3.4.1. Default settings
Parameter name Value
Address 1
Baud rate 19200
Parity No
Data bits 8
Stop bits 1
Reply Delay [ms] 0
Modbus Type RTU
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3.4.2. Configuration registers
Modbus Dec Hex Name Values
Address
40002 1 0x01 Address From 0 to 255
40003 2 0x02 Baud rate
0 – 2400
1 – 4800
2 – 9600
3 – 19200
4 – 38400
5 – 5 600
6 – 115200
other – value * 10
40005 4 0x04 Parity
0 – none
1 – odd
2 – even
3 – always 1
4 – always 0
40004 3 0x03 Stop Bits LSB 1 – one stop bit
2 – two stop bits
40004 3 0x03 Data Bits MSB – data bits
8 – 8 data bits
40006 5 0x05 Response delay Time in ms
4000 6 0x06 Modbus Mode 0 – RTU
1 – ASCII
4. Indicators
Indicator Description
O LED indicates that the module is correctly powered.
TX The LED lights up when the unit received the correct packet and sends the
answer.
AIV , AII LED indicates that the signal to input is connected and is different from 0
DO LED indicates that the output is on.
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5. Bloc diagram
6. Module Connection
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MUX
ADC
V
IN
I
IN
100 Ω
COM
V+
OUT
μC
RS48
VCC
GND
GND
48 -
48 +

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7. Modules Registers
7.1. Registered access
Modbus Dec Hex Register Name Access Description
30001 0 0x00 Version/Type Read Version and Type of the device
30002 1 0x01 Address Read Module Address
40003 2 0x02 Baud rate Read & Write RS485 baud rate
40004 3 0x03 Stop Bits & Data Bits Read & Write No of Stop bits & Data Bits (see 3.4.2)
40005 4 0x04 Parity Read & Write Parity bit
40006 5 0x05 Response Delay Read & Write Response delay in ms
4000 6 0x06 Modbus Mode Read & Write Modbus Mode (ASCII or RTU)
40010 9 0x09 Filter Read & Write Measurement filtering, value from 1 to 10
40033 32 0x20 Received packets MSB Read & Write No of received packets
40034 33 0x21 Received packets LSB Read & Write
40035 34 0x22 Incorrect packets MSB Read & Write No of received packets with error
40036 35 0x23 Incorrect packets LSB Read & Write
4003 36 0x24 Sent packets MSB Read & Write No of sent packets
40038 3 0x25 Sent packets LSB Read & Write
30051 50 0x32 Inputs Read Connected inputs
Bit in high state → signal is connected
40052 51 0x33 Outputs Read & Write Alarms state
bit no. 3 digital output
30053 52 0x34 Voltage Read Voltage in μV
30054 53 0x35 Current Read Current in μA or ‰
30055 54 0x36 Alarm – max voltage Read & Write Maximum value of voltage excess which causes set
bit no 1 in the register 40052
30056 55 0x3 Alarm – min voltage Read & Write Minimum value of voltage. If voltage drops below
this voltage bit no 1 in the register 40052 is set.
3005 56 0x38 Alarm – max current Read & Write Maximum value of current excess which causes set
bit no 1 in the register 40052
30058 5 0x39 Alarm – min current Read & Write Minimum value of current. If current drops below
this voltage bit no 1 in the register 40052 is set.
30059 58 0x3A Voltage alarm configuration Read & Write Alarms configuration
0 – alarms state depends on actual values
1 – alarms state need to clear by master
30060 59 0x3B Current alarm configuration Read & Write
30061 60 0x3C Voltage input configuration Read & Write
0 – OFF
1 – 0 .. 10V
2 – -10 .. 10V
3 – 0 .. 1V
4 – -1 .. 1V
40062 61 0x3D Current input configuration Read & Write
0 – OFF
1 – 0 .. 20mA (in μA)
2 – 4 .. 20mA (in ‰)
3 – -20mA .. 20mA (in μA)
40063 62 0x3E Digital output configuration Read & Write Digital output configuration
0 – output controlled by master
1 – output state depends voltage
2 – output state depends current
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Modbus Dec Hex Register Name Access Description
+256 – output set if value is greater than alarm value
(40065 register) („cooling”)
+512 – output set if value is below than alarm value
(40065 register) („warming”)
40064 63 0x3F Alarm value Read & Write Alarm value
40065 64 0x40 Alarm hysteresis Read & Write Hysteresis for alarm
7.2. Bit access
Modbus
Address
Dec
Address
Hex
Address Register name Access Description
801 800 0x320 Voltage input Read Voltage input state
802 801 0x321 Current input Read Current input state
81 816 0x330 Voltage alarm Read & Write Voltage alarm state
818 81 0x331 Current alarm Read & Write Current alarm state
819 818 0x332 Digital output Read & Write Digital output state
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