Modbus Data Logger with Digital IO

DAT9000DLIO Wiring Diagram

RS-485	Slave	Master
D-	Port 0 Pin 1	Port 1 Pin 5
D+	Port 0 Pin 2	Port 1 Pin 6
GND	Port 0 GND	Port 1 GND
RS-232D	Front view	PC DB9
GND	Port 0 Pin 4	Pin 5
RX	Port 0 Pin 5	Pin 3
TX	Port 0 Pin 6	Pin 2
Power Supply (18-30Vdc).	Positive G Negative F.
INIT	Short pin E to F
Digital Input	Common	Input
DI0	Pin 12	Pin 13
DI1	Pin 12	Pin 14
DI2	Pin 12	Pin 15
DI3	Pin 12	Pin 16
Relay 0	K	NO L NC M
Relay 1	N	NO O NC P

• Modbus Data Logging and digital input and relay output.
• Mathematical and Logic functions.

This application is converting an RTD Sensor input on a DAT3019 to a register. The DAT9000DL Modbus Master polls the DAT3019 and stores the temperature reading to it’s own register and then saves it to an SD RAM card.

Start-up.

1. The DAT3019 eight channel Modbus Slave has a Baud rate of 9600, Parity None, 1 Stop bit and it is Address 20.
2. You can connect to the DAT9000 V2 with Ethernet, uUSB or on the RS485 Slave port. For this application we have decided to connect with the Ethernet Port using a cross-over Cat-5 cable.
3. The minimum time period between logs is 10 Seconds.

Wiring connections for DAT3019 and the DAT9000DL.

1. Connect power to the DAT3019 and the DAT9000 DL Version 2 Modbus Data Logger Master Controller.
2. Connect the DAT3019 Modbus Slave port to the DAT9000 Modbus Master Port.
3. Connect Cat 5 crossover cable to the Ethernet port and PC.
4. Connect an RTD Temperature calibrator to the channel 0 input.
5. Download Dev9K Version 2 software from Datexel download page and run software.

The Control screen opens.

This is the main control screen for the Dev 9k Version 2. From here you can configure the Communication ports. Design and save new projects and open existing projects. In the left panel you have the function blocks. The center is the layout page for the program with the START position. On the right panel you have the registers. By Clicking the Refresh you can see what is stored in the registers.

Build the Function Block Program.

There is only 1 Function block in the program. The Function Block will read register 40015 which is Channel 0 on the DAT3019 and the Address of the DAT3019 is 20. The Function block will poll the DAT3019 and obtain the Integer and place it into the DAT9000DL on register 35. We will be using a Read Input and must deduct 40001 from the register table so the actual Register we use on the read Input Function Block will be 14.

1. Click the Read/Write label on the lower left panel.
2. Drag the Read Input Function block to below the Start Icon.
3. The Insert Data Block will open and you can enter the data needed to obtain the Register.
4. Address 20, Register 14, Number 1 (we only need the flow input register), Dest 35 (we will store the register reading in Register 35 on the DAT9000DL) Click OK.

Now set up what needs to be Logged (Variables).

1. Click Tools.
2. Click Variables.
3. In the First line type Date in the Label box.
4. Under Type Click the Date in the drop down box.
5. Under CVS Header Name Type Date.
6. Click the pencil to write to the program.
7. Repeat on the next line for Time.
8. Click the third line.
9. Enter Temperature Under Label.
10. The type will be Int for Integer.
11. The Output Format will be 5 digits and 1 decimals. This is because the current reading is 233 which is actually 23.3.
12. Click the pencil and then Click OK.

Scheduler, at what period of time it will log.

1. Click Scheduler and the Scheduler box will open.
2. Click “Create New” at the bottom.
3. Step One, and select CSV standard and then click Next.
4. Step Two, insert a Temperature in Insert name of Profile.
5. Select time from as todays date and change the date to December 2099. Which should happen by clicking the down arrow. Click Next.
6. Step Three now select at what period of time you want to log. Write in Clock 1 and select Minute. The DAT9000DL will now log every 1 Minute. Click Next.
7. Step four, select how often you require a new file to be written click Hour. Click Next.
8. Step Five, drag over which ID you want to log. Drag over #000, for the Date, #001, for Time, #002, for the Temperature. Now click Save.
9. Check the screen and make any changes that may be needed.

Save and Run the Program.

1. Click Save, reconnect to the DAT9000DL, Debug, Download wait for the download to finish. This may happen twice. Very Important, click release to write to the eeprom.
2. Wait about 10 minutes and remove the SD Ram or USB Stick and Check on a PC for the logged file. Or you can click Web above the Register table.
3. Enter the User name Fact_user and password Fact_pwd.
4. Click Log Data.
5. Click DIR0 and drill down to the CSV file and open with Notepad.

Explanation of the Project.

• Connected to a DAT9000DL Modbus Data logger with Ethernet.
• Configured the DAT9000DL Modbus Data Logger to be a Modbus Controller.
• Set up communication ports on the DAT3019 Modbus RTD to Modbus Slave and the DAT9000DL Modbus Master Data logger.
• Read the internal register of the DAT3019 RTD Modbus Slave with a read input Function Block and move it to the Modbus Data Logger.
• Selected which Variables to Store to the SD RAM or USB storage device.
• Scheduled a time period to log the variables to the SD RAM or USB storage device.