Datexel DAT 3015-V User Manual - Page 4

Browse online or download pdf User Manual for I/O Systems Datexel DAT 3015-V. Datexel DAT 3015-V 4 pages. Distributed i/o device 4 channels v or ma inputs on rs-485 network modbus protocol

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HOW TO USE THE "INIT" FUNCTION

If the exact configuration of a module is unknown, it can result impossible to establish a communication with it.

The "INIT" function gives a solution to this throuble:

- Connect to the RS485 net only the device to configure.

- Turn off the device.

- Connect the INIT pin (D) to the GND pin (C).

- Turn on the device.

- Ensures that the "PWR" green LED on the front of the enclosure is lighted.

If not, control the voltage supply connections ( I and J pins ) and RS485 net connections ( A and B pins).

If the supply connection is right, and the led still unlighted, it can be necessary to invert the RS485 pins connection.

- Set the communication port to these values:

baud-rate = 9600 bps

parity = None

n° bits = 8

stop bits = 1

- The device now communicates at the address 01 with the RTU protocol.

- Read or program the desired settings on the registers:

40006 : "Communication" for the baud-rate setting

40007 : "Address" for the net address of the device

- Turn off the device.

- Disconnect the INIT pin from the GND pin.

- Turn on the device.

- Set the communication port at the baud-rate programmed in the 40006 register.

- The device now communicates with the addressprogrammed in the 40007 register.

NOTE: The default manufacturer programmation is the following:

- Address : 01

- Baud-rate : 38400 bps

- Protocol : RTU

WATCHDOG

The modules has been provided of a Host Watchdog timer which, when it is enabled, makes to start the alarm each time the communication between

the module and the host is inactive for a period time greater then the programmed one. When the alarm goes on, the values of the outputs are

automatically converted to the values set as 'safety value', that corresponding to the state in which the outputs must be putted, and therefore the

actuators are putted, to avoid damages to the system in case of failure. Moreover, under the alarm condition the green LED on the front of the

enclosure is blinking and the "Watchdog Event" coil is forced to 1.

To return from the alarm condition, reset the coil "Watchdog Event" coil: the LED stop blinking and it is possible to set the outputs.

There is also a Module Watchdog timer that monitor the internal CPU work and is active when the CPU don't function correctly for any reason, and

resets the module. After the reset, all outputs will assume their initial default value ("power up value"), that may be different to the output value after the

reset.

SYNCHRONISM

The Synchronism function is performed by a command sent to all devices connected on the net. When the devices receive the Sync command, all

input states are saved in the relative register, to be read after time. Doing this, it is possible to read the value of all inputs at the Sync command time.

To send the synchronism command, write the value 10 in the "Test" register (40001) at the address 255.

NOTE: The sync values are not saved in EPROM.

CALIBRATION

The procedure of calibration is performed in factory on all the modules during the testing phase. However it can be convenient to make another

calibration of the module according to the requirements of the user. To make this, it is necessary to use precision instruments and to correctly perform

all the necessary steps, because any error reduces the accuracy and the good operation of the device.

To re-calibrate the device, follow this procedure:

1 – Turn on the device in INIT condition

2 – Connect a calibrator to the channel #0.

3 – Program the input type to be calibrated

4 – Set the calibrator at 0V or 0mA

5 – Write on the "Test" register (40001) the value 20.

6 – Set the calibrator to the full-scale value (10V or 20mA)

7 – Write on the "Test" register (40001) the value 30.

8 – Repeat point 3 to 7 for each input type to be calibrated.

Datexel reserves its right to modify the characteristics of its products totally or in part without warning at any time.

PROCEDURES

RIF. FW : 3310

ED.11.06 REV.01

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