NOVUS DigiRail-2A User Manual

DigiRail-2A

Universal Analog Input Modules

INSTRUCTION MANUAL

INTRODUCTION

The Universal Analog Input Modbus Module - DigiRail-2A is a
remote measuring unit with two configurable analog inputs. An
RS485 serial interface allows reading and configuration of these
inputs, through communication network. It's appropriate for
mounting on DIN 35 mm rails.

The inputs are electrically insulated from the serial interface and the
module supply. There is no electrical insulation between inputs.
There is also no electrical insulation between serial interface and
supply.

Configuration of the DigiRail-2A is performed through the RS485
interface by using Modbus RTU commands. The DigiConfig
software allows the configuration of all features of the DigiRail as
well as its diagnostics. The DigiConfig offers features for detecting
the devices present in the Modbus network and for configuring the
communication parameters of the DigiRail-2A.

This manual provides the instructions for installation and connection
of the module. The installer for DigiConfig and the documentation
regarding Modbus communication for the DigiRail-2A
(Communication Manual of the DigiRail-2A) are included in the CD­ROM which accompanies the product. They are also available for
download at www.novusautomation.com.

Figure 1 – Electrical Connections

CONNECTIONS – INPUT 0-5 VDC / 0-10 VDC

For using the 0-5 Vdc and 0-10 Vdc input types, the user must
beforehand switch the position of the inner module jumpers. To this
end, the module must be opened and jumpers J1 and J2 (input 1
and input 2, respectively) must be changed due to the following
options:

• For 0-5 Vdc and 0-10 Vdc input types, positions 1 and 2 must

be strapped.

• For all other input types, positions 2 and 3 must be strapped

(factory position).

ELECTRICAL INSTALLATION

RECOMMENDATIONS FOR INSTALLATION

• Input and communication signal conductors must pass through

the system plant separated from the electrical network
conductors, if possible, in grounded conduits.

• The supply for the instruments must be provided from a proper

network for instrumentation.

• In control and monitoring applications, it is essential considering

what may occur if any of the system parts should fail.

• We recommend the use of RC FILTERS (47Ω and 100nF,

series) in parallel with contactor and solenoid coils which are
close or connected to DigiRail.

ELECTRICAL CONNECTIONS

Figure 1 shows the necessary electrical connections. The terminals

1, 2, 3, 7, 8 and 9 are intended for the input connections, 5 and 6 for
the module supply and 10, 11 and 12 for the digital communication.
For obtaining a better electrical contact with the connectors, we
recommend the use of pin terminals at the conductors' end. For
direct wire connection, the minimum gage recommended is 0.14
mm², not exceeding 4.00 mm².

Be careful when connecting the supply terminals to
the DigiRail. If the positive conductor of the supply
source is connected, even momentarily, to one of the
communication connection terminals, the module
may be damaged.

Figure 2 – Jumper for 0-5 Vdc and 0-10 Vdc input

CONFIGURATION

The user will receive the module perfectly calibrated, no adjustment
will be required. The original configuration features the following
characteristics:

Sensor thermocouple wire J, Indication ºC, Filter = 0

Address=247, BaudRate=1200, Parity Even,

1 Stop Bit

The application DigiConfig is a program for Windows® used for
configuration of the modules DigiRail. For its installation, run the
DigiConfigSetup.exe file from the CD-ROM of the product and
follow the instructions as shown.

DigiConfig is provided with a complete help file, giving all the
information necessary for its full use. For using the help feature,
start the application and chose the "Help" menu or press the F1 key.

If you do not have the CD-ROM which comes together with the
product, go to
installer for DigiConfig and the additional product manuals.

www.novusautomation.com in order to obtain the

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DigiRail-2A

SPECIFICATIONS

Inputs: 2 universal analog inputs.

Input signals: Configurable. Refer to Table 1.

Thermocouples: Types J, K, T, R, S, B, N and E, according to

NBR 12771. Impedance >> 1MΩ
Pt100: 3 wires type, α= .00385, NBR 13773, Excitation of 700µA.

For using Pt100 2 wires, interconnect terminals 2 and 3.

When gauging the module using the calibrator for
Pt100, be sure that the minimum current required for
it is compatible with the specified excitation current:

700µA.

Other Signals:

• 0 to 20 mV, -10 to 20 mV, 0 to 50 mV.
Impedance >> 1 MΩ

• 0 to 5 Vdc, 0 to 10 Vdc. Impedance >> 1 MΩ

• 0 to 20 mA, 4 to 20 mA.
Impedance = 100 Ω (+ 1.7 Vdc)

Overall accuracy (at 25°C): Thermocouples: 0.25% of the

maximum range, ± 1°C; Pt100, voltage and current: 0.15% of the

maximum range;

Input Signal Maximum Measuring Range

Thermocouple J -130 to 940 °C (-202 to 1724 ºF)

Thermocouple K -200 to 1370 °C (-328 to 2498 ºF)

Thermocouple T -200 to 400 °C (-328 to 752 ºF)

Thermocouple E -100 to 720 °C (-148 to 1328 ºF)

Thermocouple N -200 to 1,300 °C (-328 to 2372 ºF)

Thermocouple R 0 to 1760 °C (-32 to 3200 ºF)

Thermocouple S 0 to 1760 °C (-32 to 3200 ºF)

Thermocouple B 500 to 1800 °C (932 to 3272 ºF)

Pt100 -200 to 650°C (-328 to 1202 ºF)

0 to 20 mV

-10 to 20 mV

0 to 50 mV

0 to 5 Vdc

*

0 to 10 Vdc

*

0 to 20 mA

4 to 20 mA

Table 1 – Sensors and signals accepted by the module

Sampling rate: from 2.5 to 10 samples per second

Internal compensation of cold junction for thermocouples

Power: 10 to 35 Vdc / 50 mA maximum. Internal protection against

polarity inversion.

Electrical insulation between inputs and supply/serial port:

1000 Vac

Serial communication: RS485 at two wires, Modbus RTU protocol.
Configurable parameters: Communication speed: from 1200 to
115200 bps; Parity: even, odd or none

Key for restoring communication parameters: The RCom key, at
the front panel, will set the device in diagnostics mode (address
246, baud rate 1200, parity even, 1 stop bit), able to be detected
and configured by the DigiConfig software.

Frontal light indicators for communication and status:

TX: Signalizes that the device is sending data on the

RS485 line;
RX: Signalizes that the device is receiving data on the
RS485 line;

Adjustable between -31000 and +31000

Status: When the light is permanently on, this means that
the device is in normal operation; when the light is flashing in a
second interval (approximately), this means that the device is in
diagnostics mode; when the light is flashing fast, this means
that there is an internal error.

Electromagnetic compatibility: EN 61326:2000

Operating temperature: 0 to 70 °C

Operational relative humidity: 0 to 90% RH

Envelope of the terminals: Polyamide

Assembly: DIN 35 mm rail

Dimensions: Refer to Figure 3.

Figure 3 – Dimensions

WARRANTY

Warranty conditions are available on our web site

www.novusatomation.com.

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