ModBus RTU IO Module

DAT3012

• ModBus RTU Slave.
• 2 Analog Isolated Inputs.
• 2 Analog Isolated Outputs 4-20mA.
• 4 Digital Isolated Inputs.
• 3 Relays.
• All way isolation.

General Description

The ModBus RTU IO Module DAT3012 is an input-output module that can accept two analog inputs and provide two isolated ModBus RTU 4 20mA outputs. The DAT3012 also acts as an isolated digital input ModBus RTU module and a digital ModBus RTU output module. The Input and Outputs are also isolated from the power supply and RS485 ModBus RTU communication port.
The DAT3012 has 4 Digital inputs which can operate up to 3 kHz, and Three single pole double throw relay outputs with a rating up to 2 Amps.
The input to the DAT3012 is selectable and can be set remotely on the ModBus communication. The input options are Voltage, Thermocouples, RTD's, Resistance Potentiometers and Current. The analog output is an isolated 4-20mA or 0-20mA.
The DAT3012 can be used as an Isolated ModBus RTU 4-20mA output.
The DAT3012 is an Isolated digital input ModBus RTU module and digital counter.
The DAT3012 is an Isolated ModBus analog input card which can accept Thermocouples, RTD's, Current, Voltage, mV, resistance and Potentiometers.
The DAT3012 ModBus RTU IO is a ModBus Slave.

INPUT	OUTPUT	POWER SUPPLY
mV, Volts, mA, 4 Digital Inputs.	2 X Current 4-20mA.	Power Supply Voltage 18-30Vdc
RTD, Resistance, Potentiometer,Thermocouples.	3 SPST Relays.	Reverse polarity protection 60Vdc
CURRENT CONSUMPTION	CONFIGURATION	ISOLATION
Between 30 and 100 mA	PC Programmable	Between Input/Output/RS485/Power Supply 1500Vac.
EMC	HOUSING	TEMPERATURE
For Industrial environments	Material self-extinguishing	Operating Temperature 14°F +140°F -10°C +60°C
Immunity EN 61000-6-2	Dimensions W x H x T 4" x 4 3/4" x 3/4"	Storage Temperature -40°F +185°F-40°C +85°C
Emission EN 6100-6-4	100 x 120x x 22.5 mm	UL Operative Temperature 14°F +104°F -10°C +40°C
	Weight 3 oz 90 g

DAT3012 Datasheet

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Applications
Specifications
Drawings
DAT3012 User Guide
ModBus Analog Input Modules
ModBus Analog Output
Application Note

User Instructions

Before installing the DAT3012, please read the “Installation Instruction” section. If the DAT3012 configuration is unknown, with DAT3012 switched off, connect the INIT terminal to the GND terminal (ground), reconnect the power and the DAT3012 will have the default settings (refer to the User Guide of the DAT3012). Connect the serial bus, analog, and digital inputs and outputs as shown in the “Wiring” section. The green “PWR” LED remains ON while power is connected, the yellow LED “STS” changes state and depends on the working condition of the DAT3012: refer to the "Light Signaling" section to verify the device working state. To perform configuration and calibration operations, read the instructions in the User Guide of the DAT3012. To simplify handling or to replace the DAT3012, it is possible to remove the wired terminals even with the device powered.

Specifications

Input type:	Min	Max
Current
20 mA	-20 mA	20 mA

Voltage
100 mV	-100 mV	100 mV
10 V	-10 V	10 V

Thermocouple
J Type Thermocouple	-346℉	2192℉
	-210℃	1200℃
K Type Thermocouple	-346℉	2498℉
	-210℃	1370℃
R Type Thermocouple	-58℉	3200℉
	-50℃	1760℃
S Type Thermocouple	-58℉	3200℉
	-50℃	1760℃
B Type Thermocouple	752℉	3317℉
	400℃	1825℃
E Type Thermocouple	-346℉	1832℉
	-210℃	1000℃
T Type Thermocouple	-346℉	752℉
	-210℃	400℃
N Type Thermocouple	-346℉	2372℉
	-210℃	1300℃

RTD 2, 3 Wire
Pt 100	-328℉	1562℉
	-200℃	850℃
Pt 1000	-328℉	392℉
	-200℃	200℃
Ni 100	-76℉	356℉
	-60℃	180℃
Ni 1000	-76℉	302℉
	-60℃	150℃

Resistance 2,3 Wires
Low	0 Ω	100 Ω
High	0 Ω	2000 Ω
Accuracy
mV, Volt, mA, Pot, RTD, Resistance	±0.05% f.s.
Thermocouple	> of ±0.05% f.s. or 5uV

Linearity.
mV, Volt, mA	±0.05% f.s.
Pot, RTD, Resistance	±0.1% f.s.
Thermocouple	±0.2% f.s.

Excitation Current.	RTD, Res, Pot.	Typical 0.7 mA

Line resistance influence
RTD, Res 3 wires	0.05 f.s.%/Ω
mV, T/C	0.8 uV/Ω

CJC error	± 1.8 ℉	± 1 ℃

Input Impedance
mV, Thermocouple	10 MΩ
mA	22 Ω

Thermal Drift
Inputs Full Scale	±0.01% f.s./℉	±0.01% f.s./℃
Thermal Drift CJC
Full Scale	±0.02% f.s./℉	±0.02% f.s./℃

Number of Channels	4 Channels
Pulse Counters 32 bit	4 up to 3 kHz
Input Voltage	Off State 0-3V
	On State 10-30V
Input Impedance	4.7 KΩ

Signal type	Min	Max
	0 mA	20 mA

Accuracy	±0.05% f.s.
Linearity	±0.05% f.s.
Thermal Drift	±0.01% f.s.
Load resistance	< 500Ω
Auxiliary Voltage	12 Volts @ 20 mA
Sample Time	from 10 to 90% 500 ms
Warm up time	3 minutes

Digital Output
Number of outputs	3
Max Switching power	2 A @ 250 Vac	2 A @ 30 Vdc
Minimum Load	5 Vdc, 10mA
Dielectric Strength Between Contacts	1000 Vac	50 Hz 1 Min
Dielectric Strength Between Coil and Contacts	1000 Vac	50 Hz 1 Min

Baud Rate	Up to 115.2 Kbps
Maximum Distance	4000 ft	1.2 Km

Power supply voltage	18 .. 30 Vdc
Reverse polarity protection	60 Vdc max
Current Consumption	100 mA

Power Supply RS485 Analog input Analog output Digital Input Relays	1500Vac 50Hz, 1 Min

Operative temperature	14℉ to 140℉
	-10℃ to 60℃
UL Operative temperature	14℉ to 104℉
	-10℃ to 40℃
Storage temperature	-40℉ to 185℉
	-40℃ to 85℃
Humidity (not condensed)	0 to 90 %
Maximum Altitude	6500ft 2000m
Installation	Indoor
Category of installation	II
Pollution Degree	2
Weight	6 Oz
	150 g.
Material	Self-extinguish plastic
IP Rating	IP20
Wiring size	AWG 14-18
	0.8÷2.1 mm²
Screw torque	0.8 N m
Mounting	DIN rail standard EN-50022 and EN-50035
Dimensions	H x" L x" T x"
	H 100 mm L 120 mm T 22.5 mm
EMC	For industrial environments
Immunity	EN 61000-6-2
Emission	EN 61000-6-4

Drawings

Channel A Analog Input

Universal input for the DAT3012 channel A

Channel B Analog Input

Input.	Channel A	Channel B1
RTD 3 Wire	3 and 2 Compensation 1	13 and 11 Compensation 10
Potentiometer	6 and 4 Wiper 5	15 and 13 Wiper 14
mV	Positive 2 Negative 3	Positive 11 Negative 12
Thermocouple	Positive 2 Negative 3	Positive 11 Negative 12
Volts	Positive 7 Negative 9	Positive 16 Negative 15
mA	Positive 8 Negative 9	Positive 17 Negative 15
Common	3, 6, 9	12, 13

Connect the wiring to the correct input on each channel. The input reading will be displayed on Register 40027 for input A and 40028 for input B. Please note on channel A the Terminals 3, 6 and 9 are connected together. On channel B, 12 and 13 are connected to each other.

Digital input

Common	18
DI 0	Terminal 19
DI 1	Terminal 20
DI 2	Terminal 21
DI 3	Terminal 22

The ON signal is between 10-30 Vdc. The OFF flag is below 3 Volts. A signal needs to be supplied between Terminal 18 and the Digital input.

Analog Outputs

Analog output for Modbus RTU IO module DAT3012

Analog Outputs

	Active Loop	Passive Loop
Auxiliary Voltage Output	Terminal D
Terminal E	Load 0 Return	Load 0 Return
Terminal F	Load 1 Return	Load 1 Return
Terminal G	No Connection	Ground

Active loop is when the DAT3012 supplies the Voltage to power up the outputs. Passive Loop is when a power supply is external to the DAT3012.

Relay Outputs

Relay 0	Terminal K	Terminal L
Relay 1	Terminal M	Terminal N
Relay 2	Terminal O	Terminal P

The DAT3012 is fitted with 3 similar relays with single pole single throw contacts.

Power Supply, RS-485 and Init

The DAT3012 ModBus Remote terminal unit is powered by 24 Vdc and can work with a tolerance between 18 and 30 Vdc. The ModBus RS485 signal is connected to terminal A and B. It is good practice to always use a shielded cable and earth the shield at one end of the coaxial cable.
If the DAT3012 configuration is unknown, with DAT3012 switched off, connect the INIT terminal to the GND terminal (ground), reconnect the power and the DAT3012 will have the default settings (refer to the User Guide of the DAT3012).

Power Supply, RS-485 and Init

Power Supply
18 -30 Vdc	Terminal J Positive	Terminal I Ground
RS-485
Terminal A D-	Terminal B D+	Terminal C Ground
Init
Terminal H Init	Terminal B Ground

Isolation Map

Galvanic Isolation layout for the Modbus RTU IO module DAT3012

The Analog and Digital inputs and Outputs are all isolated from the power supply and the RS485 ModBus communication port.

LED Signaling

LED	Color	State	Description
PWR	Green	On OFF Blink	Power On Power Off Watch-Dog Alarm
STS	Yellow	Off	Correct operation
RX	Red	Blink Off	Receiving Data No Data Receiving
TX	Red	Blink Off	Send Data Not Send Data
I(n)	Red	On Off	Digital Input "n" On Digital Input "n" Off
R(n)	Red	On Off	Digital Output "n" On Digital Output "n" Off

The DAT3012 has LED indication for different conditions. The Green LED is for Power Indication of the ModBus RTU IO Module. The Yellow is for the correct operation. The RX and TX red indication indicates sending and receiving the RS485 ModBus communication. The I indication indicates that a Digital input has been seen and R Led is indicating the Relay output has been activated.

The ModBus RTU IO module DAT3012 is suitable for fitting on to an EN-50022 top hat DIN rail in the vertical position. For optimum operation follow these instructions: Install the DAT3012 side by side. However, it may be necessary to separate them by at least 5 mm in the following case: Avoid temperature exceeding 45°C. Make sure that sufficient air flow is provided for the DAT3012 ventilation slits. Avoid mounting above appliances generating heat. Fit the DAT3012 in the lower part of the panel. Avoid high vibration. Don't route conductors near power signal cables such as motors, induction ovens, inverters, also use shielded cable for connecting signals.

Applications

What will the reading look like in the register table for the thermocouple input?
The input of 510'C will display 5100 in the register table. It will show one digit of the decimal. It will show in the register table at ether 40027 or 40028.

Back to General Description
Application Note Modbus RTU Analog and Digital IO DAT3012.
Printed Version

Set Up the DAT3012.

Connect 24 Vdc to I and J.
Connect RS485 to A and B.
Connect an Input to the Analog A. For this application note we have chosen the default setting of an RTD.
To check the Digital Input Connect 24Vdc across DI_C and DI_1.
Connect a Multimeter between terminal D and E to read the 4-20mA output.
Connect a Multimeter to measure the output of the relay on Terminal K and L, which is Relay Output 0.
If the communication parameters are unknown, short out the INIT connections H and I.
Power up the DAT3012 Modbus RTU Slave.

It is advisable to use the DAT3580 to connect the DAT3012 to the PC. The advantage of using the DAT3580 is that it will isolate your PC from the DAT3012. The DAT3580 options are USB, Ethernet and RS232. If the DAT3580USB version is used, install the USB drivers. If the DAT3580MBTCP or the DAT3580GW are used, make sure the Ethernet parameters are compatible with the net and transmission of data over port 502 is allowed.

DAT3012 Modbus RTU Slave for analog and digital io

Set-up PC.

Download the 3000-10000 Software from www.datexel.com download page.
Close all other software.
UnZIP the Modbus_3000_10000_setup software.
Run the 3000-10000 software.
To start the software click the English version.

Start page for the Modbus 3000-10000 software

Set Up Communication.

The software should automatically select the correct comms port. It is possible to override the comms port or refresh if you change the physical port.
Choose the correct Com port settings.
Click Open Com. The Port Status will change to green.
The default Baud rate is either written on the Label or 38400bps. If the INIT is shorted, the Baud rate will be 9600bps, RTU, Data Bit 8, Stop Bit1, Parity None.

Communication screen for the Modbus 3000-10000 software

Selecting the Modbus RTU IO Module DAT3012.

The green light only indicates the port is open. Even if the settings are incorrect the light will turn green.
Select Model and the drop down navigation will appear.
Select DAT3012.

Setting the Address of the DAT3012 Modbus Slave.

Change the Address to connect to 1 or what is written on the label.
Click "Read data" (Single poll).
The screen should now display the below screen.
If there is a function error, no CRC match, check Baud rate, RS485 connection or Modbus Slave Address.
This needs to be fixed before further progress. If you have not used the INIT on terminals C and D, it is highly recommended that you do now. Then return to Communication set up and set the settings to 9600bps, RTU, Data Bit 8, Stop Bit1, Parity None.
This will always be the correct setting unless it differs on the label.

Reading the analog input on the DAT3012.

Connect a sensor to the input terminals for chosen sensor, We have selected an RTD for this application note.
Select the correct sensor from the drop down option under Input Type.
Click the Write button.
Click the Read data button.
The correct sensor reading should be under the Measure label.

Continuing reading the temperature DAT3012

Digital input and Counter DAT3012 Modbus Slave.

Connect 24Vdc to the Input terminals 18 and 19.
Click Continue read.
The channel 0 box under the Digital Input should change state to red.
Remove the 24 Vdc and the box should return to gray.
The counter increases by 1 each time the connection is made.
The counter can be reset when the reset all counters is clicked.
Should a function generator be connected and set to a particular frequency this can be seen under the frequency box.

Providing a 4-20 mA output from the DAT3012 Modbus IO Module.

Under the measure label type 20 for 20 mA output.
Click write.
On Terminal D and E you should be able to read 20 mA with a multimeter.
On terminal G and E you will be able to measure 20mA if you connect in series a 24 Vdc power supply.
Type 4mA to measure 4 mA on the output.
Type in any other number between 0 and 20mA and to check the entire mA output range. ted and set to a particular frequency this can be seen under the frequency box.

Checking the relay output operation of the DAT3012 Modbus RTU Analog and Digital IO Slave module.

Measure the resistance across relay output terminals K and L. It should be open circuit.
Click the 0 tab inside the box next to the Digital Output label.
You should be able to hear the relay operation and measure the low resistance across the Modbus relay output Slave terminals K and L, relay out 0.f

The actual Address of the DAT3012 connected.
The actual baud rate of the DAT3012 connected.
The actual parity mode of the DAT3012 connected.
The actual number of bit selection of the DAT3012 connected.
The actual Modbus modality (RTU or ASCII) set for the DAT3012 connected
The string read from the DAT3012 of 4 ASCII characters used to name it example DAT3012.
The firmware version read from the DAT3012.
The watchdog time read from the DAT3012 is in steps of 0.5 seconds.
The delay time between the reception of a query and transmission of the response. Expressed as steps of 1 millisecond.
Indicates if the bit to enable the watchdog time of the device has been set: red indicates the bit is set, grey indicates the bit is not set.
Indicates if the watchdog timer event is occurred: red if the event occurs, grey if the event has not occurred. This condition is also signaled by the blinking of the led “PWR” of the device and the safe state of the digital outputs.
Indicates if the Power up event has occurred: red if the event has occurred, grey if the event has not occurred. This condition is also signaled by the power-up state of the digital outputs.