SENECA Z-8TC-1 Modbus RTU Module Installation Guide

SENECA Z-8TC-1 Modbus RTU Module

Manuals and configuration software are available at website: www.seneca.it/products/z-8tc-1
This document is property of SENECA Srl. Duplication and reproduction are forbidden, if not authorized. Contents of the present documentation refers to products and technologies described in it.
This informations may be modified or integrated for technical and/or commercial requirements

MODULE DESCRIPTION

Z-8TC-1 is a digital converter for thermocouples, with 8 measurement channels, collected into 4 terminal groups, insulated up to 1.5 kV, among them, from power supply and from serial communication line. The module is characterized by a six-point overall insulation.

GENERAL CHARACTERISTICS

• Thermocouples measurement type: J, K, E, N, S, R, B, T.
• Measurement available in the following sizes: Voltage (μV) or Temperature (°C, °F, °K) on Integer 16 bit and Floating-point 32 bit, direct o swapped.
• High acquisition speed.
• Protection against electrostatic discharge (ESD) up to 4 kV.
• Programmable value in case of fault or freezing of last measurement.
• Easy power supply and serial bus wiring by means of the Seneca Z-BUS housed in the DIN rail.
• Removable screw terminals for section Max. 1.5 mm2 cable.
• DIP switches configurable or software configurable communication parameters.
• RS485 Serial communication with MODBUS-RTU protocol.
• Frontal USB Port for MODBUS-RTU configuration and communication.
• Channels individually activable and configurable in pairs.

For the two inputs of each terminal group, the following common settings are available:

• Measurement adjustable for temperature or mV.
• Programmable filter for reading stabilization.
• Rejection programmable at 50 Hz or 60 Hz.
• Three configurable acquisition speeds (two 14-bit and one 15-bit).
• Integrated cold-junction compensation.

MODULE LAYOUT

LED SIGNALLING ON FRONT PANEL

PWR

(Green)

| On| Power supply presence
Off| The device is powered off
FAIL

(Yellow)

| On| Fault or Failure: power supply lack, failed channel, failed Thermocouple, internal communication error.
RX (Red)| On| Data reception from RS485 communication port.
TX (Red)| On| Data transmission to RS485 communication port.

TECHNICAL SPECIFICATIONS

TECHNICAL SPECIFICATIONS

TC INPUTS

Measurement range

| TC

type

| Allowed Range| Linearization error| TC

type

| Allowed Range| Lineariz. error
| J| -210 – 1200 °C| 0.05 °C| S| -50 – 1768 °C| 0.02 °C
| K| -200 – 1372 °C| 0.05 °C| R| -50 – 1768 °C| 0.02 °C
| E| -200 – 1000 °C| 0.02 °C| B| 250 – 1820 °C (*)| 0.03 °C
| N| -200 – 1300 °C| 0.04 °C| T| -200 – 400 °C| 0.04 °C

Span mV Impedance ADC

Total error

Thermal Drift Disturbance Rejection Cold Junction Error

| (*)Up to 250 °C: the input is considered equivalent to a null temperature value.

-10,1 – 81,4 mV.

10 MΩ.

Configurable to 14 or 15 bit.

14 bit ADC and Rejection 50 Hz: “(0,040 % + 13 μV).

15 bit ADC and Rejection 50 Hz: “(0,035 % + 10 μV).

14 bit ADC and Rejection 60 Hz: “(0,045 % + 16 μV).

15 bit ADC and Rejection 60 Hz: “(0,040 % + 12 μV).

< 100 ppm/K.

Configurable to 50 Hz or to 60 Hz.

<1 °C.

Test Current| <50 nA.
CMRR (1)| >155 dB (tested port towards all the other ones at GND).
DMRR (1) (2)| >60 dB.

1. The values are valid at the setted rejection frequency, with the filter ON.
2. For disturbance values where the input signal peak does not exceed the limit of acceptability.
   Refernce Standard EN60584-1 (ITS-90).

PRELIMINARY WARNINGS

• Before performing any operation is mandatory to read the full contents of this manual. The module may only be used by qualified and skilled technicians in the field of electric installation. Specific documentation is available for download at website: www.seneca.it/products/z-8tc-1
• Only the Manufacturer is authorized to repair the module or to replace damaged parts. The product is susceptible to electrostatic discharge, take appropriate countermeasures during any operation.
• No warranty is granted in connection with faults resulting from improper use, from modifications or repairs carried out by Manufacturer-unauthorized personnel on the device, or if the content of this user Manual is not followed..
• It is forbidden to place anything that could obstruct the ventilation slits. It is forbidden to install the module near heat sources.

Disposal of electrical & electronic equipment (applicable throughout the EU and other countries with separate collection programs). The symbol found on this product or on its packaging, indicates that this product it must be handed over to an authorised collection point for the recycling of electrical and electronic equipments.

INSTALLATION RULES

In order to ensure optimum performance and a longest working life, the module(s) must be provided with adequate ventilation and no raceways or other objects that obstruct the ventilation slots.
Never install the modules near heat sources.
We recommend installation in the lower part of the control panel.

INSTALLATION ON AND REMOVAL FROM IEC EN 60715 DIN RAIL

Insertion on the IEC EN 60715 DIN rail:

1. Move the two hooks on the back of the module outwards as illustrated in Pic.2.

2. Insert the module rear IDC10 connector into a free slot of DIN rail accessory as you can see in Pic.1.
   (the insertion is one way only because the connectors are polarized).

3. To secure the module to the IEC EN 60715 DIN rail, tighten the two hooks on the side of the IDC10 rear connector as shown in Pic.1.

Removal from IEC EN 60715 DIN rail:
As shown in Pic.2:

1. Move outwards the two hooks on the side of the module, with the help of a screwdriver.
2. Extract the module from the IEC EN 60715 DIN rail

MODBUS CONNECTION STANDARDS

1. Install the modules on the DIN rail (max 120).

2. Connect the remote modules using cables of proper length.
   On the table the following data about the cables length are provided:

   • Bus Length: Modbus network maximum length as a function of the Baud rate. It is the length of the cables which connect the two bus terminators modules (see MODBUS table).
   • Drop Length: maximum length of a drop line (see MODBUS table).

MODBUS

USE OF Z-PC-DINAL ACCESSORY

Don’t force the insertion of the IDC10 connector into the Z-PC-DIN bus. The rear IDC10 connector of the module will be inserted on a free slot of Z-PC-DIN accessory.
In the figure you can see the meaning of the various pins of the rear IDC10 connector if you want to provide the signals directly through this connector. The pictures Pic.3 and Pic.4 show how to connect powersupply and RS485 COM1 port to the rear IDC10 connector.

In case of Z-PC-DINAL2-17,5 accessory use, the signals may be provided by terminal blocks. The figure shows the meaning of terminals and the position of DIP-switch (present on each DIN rail supports) for network termination (not used in case of Modbus network).
GNDSHLD: Shield to protect the signal inside the connection cables from electromagnetic disturbances (recommended).

ELECTRICAL CONNECTIONS

POWER SUPPLY

Connect the IDC10 rear connector to provide power supply to module.
The supply voltage must be between: 10 and 40V (any polarity), or between 19 and 28 V. The upper limits mus not be exceeded as this can seriously damage the module. If the power supply source is not protected against overload, a safety fuse of max. 2.5 A must be installed in the power supply line near the device.

USB
The module has a micro USB port on frontal panel for configuration and MODBUS- RTU parameters communication.

RS485

Connection for RS485 communication with the Modbus master system through Z-PC- DINAL2-17.5 accessory.
Note: the indication of the RS485 connection polarity is not standardised and in some masters may be inverted

8 TC INPUTS

• The module input accepts thermocouples type: J, K, E, N, S, R, B, T.
• For electrical connections it is recommended to use shielded cable.
• The two channels that are part of the same terminal block have the ground terminal internally connected and aren’t isolated between them.
• However, 1.5 kV insulation is guaranteed between channels of different terminal blocks.

MODBUS REGISTERS
Detailed information about list of MODBUS registers and their functions are available inside the USER MANUAL

CONFIGURATIONS

INPUT FILTER
The filtering methods can be set for each pair of channels. The filter consists of two independent low-pass filters:
FIR Filter , in running average, able to increase the rejection of disturbances to the mains power line frequency and to reduce measuring noise.
IIR exponential Filter, with programmable time constant, able to dampen fluctuations. If an input variation higher than the threshold T is detected, both filters are forced to adapt rapidly to the new value, stabilising it only later on. The value of the voltage threshold is fixed about 0,75 mV.
Detailed information about filter settings are available inside the USER MANUAL in the REGISTER MODBUS section.

SOFTWARE CONFIGURATIONS
The EASY SETUP configuration software, allows the parameter setting. This software is available for free on the Internet site: www.seneca.com. Some parameters can also be set using DIP-switches.

DIP-SWITCHES CONFIGURATION
Before setting the DIP switches you must disconnect the power supply. The DIP- switches position defines the Modbus Address and Baud Rate communication parameters. In the following table the Baud Rate and Address values are listed as a function of the DIP-switches position.

Note: If switches from 1 to 8 are in OFF position, communication settings are retrieved from EEPROM.
2nd Note : The termination of the RS485 line must be carried out only at the ends of the communication line.

FACTORY SETTINGS

• DEFAULT CONDITION FOR THE CONFIGURATION PARAMETERS OF THE MODULE
  The instrument is configured from the factory with All DIP-switches at OFF position
  RS485 MODBUS protocol comunication parameters: 38400, 8,N,1 Addr. 1

• DEFAULT INPUT CONDITIONS FOR CHANNEL GROUPS OF THE MODULE

USB COMMUNICATION PORT

The USB communication port has priority over the port RS485 and is closed after 3 s of inactivity. The parameters (not configurable) for USB port are: 2400, 8,N,1 Addr. 1. The protocol is MODBUS RTU.

CONTACTS
Technical support support@seneca.it
Product Informations sales@seneca.it

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