USER MANUAL

Introduction

Contents of the present documentation refer to products and technologies described in it. All technical data contained in the document may be modified without prior notice. Content of this documentation is subject to periodical revision.

To use the product safely and effectively, read carefully the following instructions before use. The product must be used only for the use for which it was designed and built: any other use must be considered with full responsibility of the user.

The installation, programming and set-up is allowed only to authorized operators, physically and intellectually suitable. Set up shall be performed only after a correct installation and the user shall perform every operation described in the installation manual carefully.

Seneca is not considered liable for failure, breakdown, accident caused because of ignorance or failure to apply the indicated requirements. Seneca is not considered liable for any unauthorized changes.

Seneca reserves the right to modify the device, for any commercial or construction requirements, without the obligation to promptly update the reference manuals. No liability for the contents of this documents can be accepted. Use the concepts, examples and other content at your own risk.

There may be errors and inaccuracies in this document that may of course be damaging to your system. Proceed with caution, and although this is highly unlikely, the author(s) do not take any responsibility for that. Technical features subject to change without notice.

CONTACT US

• Technical support: supporto@seneca.it
• Product information: commerciale@seneca.it

Document revisions

This document is property of SENECA srl. Duplication and reproduction are forbidden, if not authorized.

1. DEVICE DESCRIPTION AND INTENDED USE

⚠️ WARNING! This User Manual extends the information from the Installation Manual about the device configuration. Use the Installation Manual for more info.

⚠️ WARNING! Under any circumstances, SENECA s.r.l. or its suppliers shall not be responsible for loss of recording data/incomes or for consequential or incidental damage due to neglect or reckless mishandling of the device, even though SENECA is well aware of these possible damages. SENECA, its subsidiaries, affiliates, companies of the group, its suppliers and retailers shall not guarantee that the functions will satisfy completely customer's expectations or that device, the firmware and the software shall have no errors or work continuously.

1.1. Description

The T201DCH50/100/300/600-MU are isolated, contactless loop powered AC/DC current transducers. The look and device's function are very similar to those of an active standard Current Transformer, but with the remarkable feature of measuring the DC and AC component. For their electrical endurance, ease of use, and compact dimensions, the T201DCH50-MU, T201DCH100-MU, T201DCH300-MU, and T201DCH600-MU fit every kind of current measurement: up to 50 Adc/Aac, 100 Adc/Aac, 300 Adc/Aac, and 600 Adc/Aac (respectively).

A RS485 port and an USB port with a standard Modbus RTU slave protocol are also available.

The device can measure a current in 2 different modes (using dip switches or the Easy Setup Software):

• TRUE RMS AC/DC CURRENT MEASURE
• DC BIPOLAR CURRENT MEASURE (used also for obtaining the sign +/- of a DC current)

1.2. Features

• Similar usage to a standard alternating current active C.T.
• No shunt, no wasted power from the measure circuit
• High accuracy rating
• Analog 0/10V dc with configurable start/stop values
• Digital Output configurable Alarm (Max, Min, Window)
• Suitable for use with all Seneca modules that allow to power the device with at least 12 Vdc and having a 0-10Vdc input
• Simple configuration with dip switches or with the free Easy Setup software

Additional Features:

• Two ranges, dip-switch selectable
• Damping filter availability to improve stable reading
• Modbus RTU protocol by RS485 and USB ports
• Modbus Address/Baud Rate/Range/Mode configurable also from dip switch
• Suitable for batteries, battery chargers, solar panels, power units, and generic DC and AC loads.
• Compact size: overall dimensions less than 96.5 x 68 x 26 mm
• Baud rate for Modbus RTU: from 1200 baud up to 115200 baud
• Start/Stop Input/Output Alarm Values configurable with Easy Setup software
• I Max/Min Resettable by Modbus RTU registers
• Quick installation on DIN 46277 rail

Refer to the installation manual for more information.

2. CONFIGURING THE DEVICE

The Device can be configured in two ways:

• A basic configuration from dip switches
• A full configuration from flash (using Easy Setup Software by the USB port)

⚠️ WARNING! Dip switches configuration are active only after a reboot!

⚠️ WARNING! The Dip Switch setting will overwrite the Flash setting so, if you need to use the flash configuration you MUST set ALL dip switches to "OFF".

3. DIP SWITCH CONFIGURATION

3.1. Loading configuration from flash

If ALL Dip Switch 1...8 are OFF, the device uses the Flash configuration (you must use the Easy Setup Software for configuration).

3.2. Setting the RS485 Modbus RTU Station Address

Dip Switch 1..4 are used for configuring the Modbus RTU Station Address:

3.3. Setting the RS485 Baud rate

Dip Switch 5..6 are used for setting the Baud Rate:

⚠️ WARNING! The Parity bit cannot be configured with the dip switches configuration but only from the Easy Setup software. By setting the dip switches, the parity is always set to "None" (8,N,1).

3.4. Setting the RMS/Bipolar mode and 50% - 100% full scale

Dip Switch 7: Select from True RMS Measure / Bipolar DC Measure

Dip Switch 8: Select 50% of full scale

The following figure is related to RMS measure (“Bipol” dip switch 7 = OFF):

[Diagram Description: Graph showing OUTPUT [V] on the Y-axis and INPUT [A] on the X-axis. The graph depicts a linear relationship where output voltage increases from 0V at 0A input to 10V at input 'B', representing the RMS measurement mode.]

The following figure is related to Bipolar measure (“Bipol” dip switch 7 = ON):

[Diagram Description: Graph showing OUTPUT [V] on the Y-axis and INPUT [A] on the X-axis. The graph depicts a linear relationship from negative input current to positive input current, with 0V output at 0A input. The range is symmetrical around zero.]

⚠️ WARNING! Dip switches configuration is active only after a reboot!

For example, using the RMS measure with 0 A input, the Output voltage is 0V, but using the Bipolar measure with 0 A input, the Output voltage is 5V.

4. MODBUS RTU PROTOCOL

The Modbus protocol supported by the T201DCH50-100-300-600 MU is:

• Modbus RTU Slave

For more information about these protocols, please refer to the Modbus specification website: http://www.modbus.org/specs.php.

4.1. Modbus RTU function code supported

The following Modbus RTU functions are supported:

• Read Holding Register (function 3) Max 5 Registers
• Write Single Register (function 6)
• Write Multiple registers (function 16) Max 2 Registers

⚠️ WARNING! All 32 bits values are stored into 2 consecutive registers.

⚠️ WARNING! You can Read a Maximum of 5 Modbus Registers with the Read Holding Register function (function 3).

⚠️ WARNING! You can Write a Maximum of 2 Modbus Registers with the Write Multiple Register function (function 16).

⚠️ WARNING! The USB Modbus configuration is fixed to 38400 baud, 8bit, No parity, 1 stop bit. When the USB cable is inserted, the RS485 will stop to communicate until the USB will be unplugged.

5. MODBUS REGISTER TABLE

The following abbreviations are used in the register tables:

• MS = More significant
• LS = Less significant
• MSW = 16 most significant bits
• LSW = 16 least significant bits
• MSW* = 16 most significant or least significant bits depending on the configuration (most significant default)
• LSW* = 16 less significant or more significant bits depending on the configuration (less significant default)
• MSW = 8 most significant bits
• LSW = 8 least significant bits
• MSBIT = Most significant bit
• LSBIT = Least significant bit
• RO = Register in read-only
• RW = Read/write register
• RW** = Reading and writing register contained in flash memory, writable a maximum of 10000 times.
• Unsigned 16 bit = unsigned integer register, can take values from 0 to 65535
• Signed 16 bit = signed integer register can take values from -32768 to +32767
• Float 32 bits = 32-bit single-precision floating point register (IEEE 754) https://en.wikipedia.org/wiki/IEEE_754
• BIT = Boolean registry, can be 0 (false) or 1 (true)

5.1. "0-BASED" OR "1-BASED" MODBUS ADDRESSES

According to the Modbus standard, the Holding Register registers are addressable from 0 to 65535. There are 2 different conventions for numbering the addresses: "0-BASED" and "1-BASED". For greater clarity, Seneca shows its register tables in both conventions.

❗ ATTENTION! CAREFULLY READ THE DOCUMENTATION OF THE MODBUS MASTER DEVICE IN ORDER TO UNDERSTAND WHICH OF THE TWO CONVENTIONS THE MANUFACTURER HAS DECIDED TO USE.

5.1.1. MODBUS ADDRESSES WITH "0-BASED" CONVENTION

The numbering is:

Therefore, the first register is at address 0. In the following tables, this convention is indicated with “ADDRESS OFFSET”.

5.1.2. MODBUS ADDRESSES WITH "1 BASED" CONVENTION (STANDARD)

The numbering is that established by the Modbus consortium and is of the type:

In the following tables, this convention is indicated with “ADDRESS 4x” since a 4 is added to the address so that the first Modbus register is 40001.

A further convention is also possible where the number 4 is omitted in front of the register address:

5.2. BIT CONVENTION WITHIN A MODBUS HOLDING REGISTER

A Modbus Holding Register consists of 16 bits with the following convention:

BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

For instance, if the value of the register in decimal is 12300, the value 12300 in hexadecimal is: 0x300C. The hexadecimal 0x300C in binary value is: 11000000001100. So, using the above convention, we get:

BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

0 0 1 1 0 0 0 0 0 0 0 0 1 1 0 0

5.3. MSB and LSB BYTE CONVENTION WITHIN A MODBUS HOLDING REGISTER

A Modbus Holding Register consists of 16 bits with the following convention:

BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

LSB Byte (Least Significant Byte) defines the 8 bits ranging from Bit 0 to Bit 7 included. We define MSB Byte (Most Significant Byte) the 8 bits ranging from Bit 8 to Bit 15 inclusive:

BYTE MSB

BYTE LSB

5.4. REPRESENTATION OF A 32-BIT VALUE IN TWO CONSECUTIVE MODBUS HOLDING REGISTERS

The representation of a 32-bit value in the Modbus Holding Registers is made using 2 consecutive Holding Registers (a Holding Register is a 16-bit register). To obtain the 32-bit value, it is therefore necessary to read two consecutive registers:

For example, if register 40064 contains the 16 most significant bits (MSW) while register 40065 contains the least significant 16 bits (LSW), the 32-bit value is obtained by composing the 2 registers:

BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

40064 MOST SIGNIFICANT WORD

BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

40065 LEAST SIGNIFICANT WORD

Value_32bit = Register_LSW + (Register_MSW * 65536)

In the reading registers, it is possible to swap the most significant word with the least significant word, therefore it is possible to obtain 40064 as LSW and 40065 as MSW.

5.5. TYPE OF 32-BIT FLOATING POINT DATA (IEEE 754)

The IEEE 754 standard (https://en.wikipedia.org/wiki/IEEE_754) defines the format for representing floating point numbers.

As already mentioned, since it is a 32-bit data type, its representation occupies two 16-bit holding registers. To obtain a binary / hexadecimal conversion of a floating point value, it is possible to refer to an online converter at this address: http://www.h-schmidt.net/FloatConverter/IEEE754.html.

Using the last representation, the value 2.54 is represented at 32 bits as: 0x40228F5C.

Since we have 16-bit registers available, the value must be divided into MSW and LSW:

0x4022 (16418 decimal) are the 16 most significant bits (MSW) while 0x8F5C (36700 decimal) are the 16 least significant bits (LSW).

5.6. T201DCH-MU: MODBUS 4xxxx HOLDING REGISTERS TABLE (FUNCTION CODE 3)

6. FULL CONFIGURATION WITH EASY SETUP

For configuring all the device parameters, you must use the RS485 Port and the Easy T201DCH-MU software included in the Easy Setup Suite. You can download the Easy Setup software for free from: www.seneca.it.

6.1. Easy Setup Menu

[Icons Description: The software interface displays icons for CONNECT (?), NEW (✨), OPEN (?), SAVE (?), READ (?), SEND (?), TEST (✅).]

Connect: Use the connect icon to connect the PC to the Device. Note that you need a RS485 to USB converter like Seneca S117P1 or S107USB to connect the device to a PC.

New: Load the default parameters in the actual project.

Open: Open a stored project.

Save: Save the actual project.

Read: Read the actual configuration from the device (if the dip switches are not ALL OFF, the configuration is read from dip switches).

⚠️ WARNING! If you read a configuration from the device with at least one dip switch to "ON", the software will read the dip switch configuration because it overwrites the flash configuration.

Send: Send the project configuration (if the dip switches are not ALL OFF, the device uses the dip switch configuration and NOT the sent configuration).

Test: Start a Registers read; you can also reset the MIN/MAX values and start/stop a Datalogger.

6.2. Creating a Project Configuration

[Software Screenshot Description: A screenshot of the SENECA Easy Setup software's 'Configuration' section is shown. It displays fields for Model selection (T201DCH50-MU to T201DCH600-MU), Station Address, Baud Rate, Parity, Measure Mode (True RMS or DC Bipolar), and Filter settings (LOW/HIGH).]

⚠️ WARNING! You must set all dip switches to OFF before sending the configuration to the device, or the actual configuration will be overwritten from the dip switches configuration!

The parameters in the “Configuration” section that can be configured are:

• Model: Select between T201DCH50-MU, T201DCH100-MU, T201DCH300-MU, T201DCH300-MU HW2, or T201DCH600-MU model.
• Station Address: Select The Modbus RTU station address.
• Baud Rate: Select the Baud rate from 1200 to 115200 baud.
• Parity: Select NONE, ODD, or EVEN.
• Mode: Select the current measure mode: True RMS or DC Bipolar.
• Filter: Select between LOW or HIGH:

The parameters in the “OUTPUT” section that can be configured depend on the Output Type if "Analogic" or "Digital" is selected (Only for T201DCH50/100/300-MU models).

If The Output is configured in “Analogic”:

[Software Screenshot Description: A screenshot of the SENECA Easy Setup software's 'Output' section for Analogic output is shown. It displays fields for Input Start Scale, Input Stop Scale, Output Start Scale, and Output Stop Scale.]

[Diagram Description: A graph illustrating the scaling for Analog output, showing OUTPUT [V] on the Y-axis and INPUT [A] on the X-axis. It defines 'Output Start' and 'Output Stop' voltage values corresponding to 'Input Start' and 'Input Stop' current values.]

Note: The T201DCH600-MU allows the use of both the analogue and digital output simultaneously.

Input Start/Stop Scale and Output Start/Stop Scale: Select the Start/Stop input and Output Start/Stop scale, see figure.

For example:

INPUT START = 20 A
INPUT STOP = 80 A
OUTPUT START = 2 V
OUTPUT STOP = 6 V

[Diagram Description: An example graph demonstrating the Analog output scaling with specific values: Input Start 20A, Input Stop 80A, Output Start 2V, Output Stop 6V. It notes that 0A input yields 0V output and over 80A input yields over 6V output.]

Note that with an input of 0 A the output is 0 V and over 80 A the output is over 6V (6V and 2V are not a limit).

⚠️ WARNING! The Output Voltage is limited to about 10.8V.

If The Output is configured in "Digital":

[Software Screenshot Description: A screenshot of the SENECA Easy Setup software's 'Output' section for Digital output is shown. It includes options for Digital Output Type (Normally Low/High), Alarm Type (NONE, MAXIMUM, MINIMUM, INTO THE WINDOW, OUT THE WINDOW), Alarm Delay, Hysteresis, High Alarm, and Low Alarm.]

Digital Output Type: Select between Normally Low or Normally High.

Alarm Type: Select Between:

• NONE: No Alarm active
• MAXIMUM: Alarm if the Current is above the High Threshold
• MINIMUM: Alarm if the Current is below the Low Threshold
• ACTIVE IF INTO THE WINDOW: (Alarm if the Current > Low Threshold but < High Threshold)
• ACTIVE IF OUT THE WINDOW: (Alarm if the Current is > High Threshold or < Low Threshold)

Alarm Delay: Select the Alarm delay in x 10 ms (for example write 100 for 1 second delay).

Hysteresis: Select the Alarm Hysteresis in [A].

High Alarm: Select the High Threshold for the Alarm in [A].

Low Alarm: Select the Low Threshold for the Alarm in [A].

6.3. Testing the Device

When the configuration is sent to the device, you can test the actual configuration by using the TEST (✅) icon.

[Software Screenshot Description: A screenshot of the SENECA Easy Setup software's 'Test' section is shown. It displays 'Measured Current', 'Maximum Current', 'Minimum Current', and status indicators for digital outputs like MAX ALARM, MIN ALARM, INT WINDOW ALARM, EXT WINDOW ALARM. It also shows a 'Running...' status and datalogger options.]

The test configuration will acquire the measure from the Modbus registers; you can also reset the MIN/MAX values.

6.3.1. The datalogger

The datalogger can be used for acquire data that can be used with an external software (for example Microsoft Excel™). It is possible to set how much time to acquire the samples (minimum 1 second).

[Software Screenshot Description: A screenshot of the SENECA Easy Setup software's Datalogger interface is shown. It displays current measurements, maximum and minimum current values, output voltage, and controls for enabling the datalogger, setting the interval (e.g., 1 second), starting logging (Play), and managing log files (Open last log, Open log folder).]

The datalogger will create a file in a standard .csv format that can be opened with external tools:

The file can also be opened with a text editor:

INDEX;TYPE;TIMESTAMP;I;IMAX;IMIN;VOUT

1;LOG;18/07/2017 17:37:16;9,94182968139648;10,0166397094727;0;5,50153207778931

2;LOG;18/07/2017 17:37:17;9,98420906066895;10,0598001480103;0;5,50216913223267

3;LOG;18/07/2017 17:37:18;10,0491199493408;10,0602102279663;0;5,4690899848938

4;LOG;18/07/2017 17:37:19;9,99160003662109;10,0602102279663;0;5,50054502487183

5;LOG;18/07/2017 17:37:20;10,0064001083374;10,0602102279663;0;5,49996995925903

6;LOG;18/07/2017 17:37:21;10,0018796920776;10,0602102279663;0;5,50327777862549

7;LOG;18/07/2017 17:37:22;9,94471645355225;10,0778799057007;0;5,50132608413696

8;LOG;18/07/2017 17:37:23;9,97722816467285;10,0778799057007;0;5,50247716903687

9;LOG;18/07/2017 17:37:24;10,0623197555542;10,0778799057007;0;5,50186014175415

10;LOG;18/07/2017 17:37:25;9,99120616912842;10,0778799057007;0;5,50126504898071

11;LOG;18/07/2017 17:37:26;10,0330896377563;10,0778799057007;0;5,50066900253296

12;LOG;18/07/2017 17:37:27;10,0363702774048;10,0778799057007;0;5,50058698654175

13;LOG;18/07/2017 17:37:29;10,0059795379639;10,0778799057007;0;5,50120306015015

14;LOG;18/07/2017 17:37:30;9,97681522369385;10,0778799057007;0;5,50337982177734

15;LOG;18/07/2017 17:37:31;10,0129499435425;10,0778799057007;0;5,50225019454956

16;LOG;18/07/2017 17:37:32;10,0162401199341;10,0778799057007;0;5,50075101852417

17;LOG;18/07/2017 17:37:33;10,0614995956421;10,0778799057007;0;5,50206613540649