Simex TRS-02a Manuale utente

Assisting the automation

industry since 1986

User manual

TEMPERATURE TRANSDU ER

TRS-02a

•Firmware: v.2.04 or higher

•Input type: Pt100

•Designed for TR system

Read the user's manual carefully before starting to use the unit or software.

Producer reserves the right to implement changes without prior notice.

2012.09.1 TRS-02a_INSSXEN_v.1.0 .000

User manual for - TEMPERATURE TRANSDUCER TRS-02a 
CONTENTS
1. BASIC REQUIREMENTS AND USER SAFETY........................................................................................3
2. GENERAL CHARACTERISTICS................................................................................................................4
3. TECHNICAL DATA......................................................................................................................................4
4. DEVICE INSTALLATION............................................................................................................................5
4.1. UNPACKING.......................................................................................................................................5
4.2. ASSEMBLY........................................................................................................................................5
4.3. CONNECTION METHOD...................................................................................................................6
4.4. MAINTENANCE..................................................................................................................................9
5. PRINCIPLE OF OPERATION...................................................................................................................10
6. THE MODBUS PROTOCOL HANDLING.................................................................................................10
6.1. LIST OF REGISTERS .....................................................................................................................11
6.2. READING  OF THE MEASUREMENT RESULT.............................................................................12
6.3. TRANSMISSION ERRORS DESCRIPTION....................................................................................12
6.4. EXAMPLES OF QUERY ANSWER FRAMES.................................................................................12
7. FORCING OF 0 FF ADDRESS................................................................................................................15
Explanation of symbols used in the manual:
- This symbol denotes especially important guidelines concerning the installation and  
operation of the device. Not complying  with the guidelines denoted by this symbol  
may cause an accident, damage or equipment destruction.
IF THE DEVICE IS NOT USED ACCORDING TO THE MANUAL THE USER IS  
RESPONSIBLE FOR POSSIBLE DAMAGES.
- This symbol denotes especially important characteristics of the unit.
  Read any information regarding this symbol carefully
2

User manual for - TEMPERATURE TRANSDUCER TRS-02a

1. BASIC REQUIREMENTS AND USER SAFETY

- The manufacturer is not responsible for any damages caused by

inappropriate installation, not maintaining the proper technical condition

and using the unit against its destination.

- Installation should be conducted by qualified personnel . During installation all

available safety requirements should be considered. The fitter is responsible for

executing the installation according to this manual, local safety and EMC

regulations.

- The unit must be properly set-up, according to the application. Incorrect

configuration can cause defective operation, which can lead to unit damage or

an accident.

- If in the case of a defect of unit operation there is a risk of a serious threat

to the safety of people or property additional, independent systems and

solutions to prevent such a threat must be used.

- The unit uses dangerous voltage that can cause a lethal accident. The unit

must be switched off and disconnected from the power supply prior to

starting installation of troubleshooting (in the case of malfunction).

- Neighbouring and mating equipment must meet the requirements of appropriate

standards and regulations concerning safety and be equipped with adequate

anti-overvoltage and anti-interference filters.

- Do not attempt to disassemble, repair or modify the unit yourself. The unit

has no user serviceable parts. Units, in which a defect was stated must be

disconnected and submitted for repairs at an authori ed service centre.

- Do not use the unit in areas threatened with excessive shocks, vibrations,

corrosive gasses and oils.

- Do not use the unit in explosion hazard areas.

- Do not use the unit in areas with significant temperature variations, exposed to

icing.

- Do not use the unit in areas exposed to direct sunlight.

- Make sure that the ambient temperature (e.g. inside the control box) does not

exceed the recommended values. In such cases forced cooling of the unit must

be considered (e.g. by using a ventilator).

The unit is designed for operation in an industrial environment and must

not be used in a household environment or similar.

User manual for - TEMPERATURE TRANSDUCER TRS-02a

2. GENERAL CHARACTERISTICS

The temperature transducer is designed for multipoint measurement of temperature by

means of a standard Pt100 sensor. In particular it is designed for use with bayonet sensors to

be used, for example, in smoke-houses. It may be used with any Pt100 sensors. This module

features very good compensation of effect of connection cable resistance on the result of

temperature measurement. Non-linear characteristics of the sensor is digitally linearised. The

module is equipped with Modbus RTU communication interface. It has a small plastic casing.

3. TECHNICAL DATA

Power supply voltage typically 10 VDC (9 VDC - 12 VDC)

Current consumption during operation - typically 12 mA

during Modbus transmission - up to 65 mA

Measurement input PT-100 type with automatic connection recognition

( 2, 3 or -wires)

Measurement range -50°C up to +550°C

Measurement error ±0.2%

Measurement wires resistance max. 20 Ω (every wire)

Number of modules in 1 network maximum 127

Communication interface

Baud rate

RS 85, 8N1 / Modbus RTU

9600 bit/sec.

Data memory non-volatile memory, EEPROM type

Protection level IP 65 (ABS casing)

Housing type

Housing material

Housing dimensions (L x W x D)

without glands

with glands

wall mounted

ABS

80 x 82 x 55 mm

130 x 105 x 55 mm

Operating temperature

Storage temperature

Altitude

- 0°C up to +85°C

up to 2000 meters above sea level

Fastening to wall, 2 M3 bolts

Connection cable conductors (2 supply conductors

+ 2 data transmission conductors)

Screws tightening max. torque 0,5 Nm

Max. connection leads diameter 2,5 mm2

EMC PN-EN 61326:2003

This is a class A unit. In housing or a similar area it can cause radio

frequency interference. In such cases the user can be requested to use

appropriate preventive measures.

User manual for - TEMPERATURE TRANSDUCER TRS-02a

Detailed informations about installation of TRS system user can find in:

“User manual for Temperature and Humidity Recording System”

4. DEVICE INSTALL ATION

The unit has been designed and manufactured in a way assuring a high level of user

safety and resistance to interference occurring in a typical industrial environment. In order to

take full advantage of these characteristics installation of the unit must be conducted correctly

and according to the local regulations.

- Installation should be conducted by qualified personnel .

- Read the basic safety requirements on page 3 prior to starting the installation.

- All installation works must be conducted with a disconnected power supply.

4.1. UNPACKING

After removing the unit from the protective packaging, check for transportation damage.

Any transportation damage must be immediately reported to the carrier. Also, write down the

unit serial number on the housing and report the damage to the manufacturer.

Attached with the unit please find:

- warranty,

- user’s manual for TRS-02a unit (device)

4.2. ASSEMBLY

- Disconnect the power supply prior to starting assembly.

- Check the correctness of the performed connections prior to switching the unit on.

To install the device prepare pinholes accordingly to Figure .1. Back side of the

case (with mounting holes) should be mounted to a wall using screws.

User manual for - TEMPERATURE TRANSDUCER TRS-02a

Figure 4.1. Distances between pinholes

4.3. CONNECTION METHOD

Caution

- Installation should be conducted by qualified personnel . During installation all

available safety requirements should be considered. The fitter is responsible for

executing the installation according to this manual, local safety and EMC

regulations.

- Wiring must meet appropriate standards and local regulations and laws.

- Tighten the clamping screws. The recommended tightening torque is 0.5 Nm.

Loose screws can cause fire or defective operation. Over tightening can lead to

damaging the connections inside the units and breaking the thread.

- Unused clamps (marked as n.c.) must not be used for connecting any

connecting cables (e.g. as bridges), because this can cause damage to the

equipment or electric shock.

- If the unit is equipped with housing, covers and sealing packing, protecting

against water intrusion, pay special attention to their correct tightening or clamping.

In the case of any doubt consider using additional preventive measures (covers,

roofing, seals, etc.). Carelessly executed assembly can increase the risk of electric

shock.

Due to possible significant interference in industrial installations appropriate measures

assuring correct operation of the unit must be applied. To avoid the unit of improper

indications keep recommendations listed below.

-Avoid common (parallel) leading of signal cables and transmission cables together with

power supply cables and cables controlling induction loads (e.g. contactors). Such cables

should cross at a right angle.

-Contactor coils and induction loads should be equipped with anti-interference protection

systems, e.g. RC-type.

-In the case of magnetically induced interference the use of twisted couples of signal

cables (so-called “spirals”) is recommended. The spiral (best if shielded) must be used

with RS- 85 serial transmission connections.

9,5 mm

69,5 mm

User manual for - TEMPERATURE TRANSDUCER TRS-02a

Connections of power supply voltage and measurement signals are executed using the

screw connections inside of the unit’s housing (Figure .2 - . ).

Figure 4.2. Method of cable insulation replacing and cable terminals

Figure 4.3. Location of elements inside the module case

Last module in the network

must be terminated with

100÷150 Ohm resistor .

Figure 4.4. Connection of the module to the network

max. 2 mm

6-7 mm

1 2 3 4

DATA-

DATA+

RS - 485

Us = 9 ÷ 12V DC

GND

LED indicator

force

address

0xFF switch

Power

supply and

RS-485

connector

Pt100 Pt100

7 8 996 7 8

n.c.

Pt 100

sensor

connector

A+

B-

terminator

(i.e.120 ohm)

GND

DATA-

DATA+

2 3 4 5

Us = 9 ÷ 12V DC

User manual for - TEMPERATURE TRANSDUCER TRS-02a

An example of the transducers application is multipoint monitoring system (Figure .5).

Control panel (i.e. SPA-99 made by SIMEX) is used as MASTER in MODBUS network,

simultaneously it displays readed informations of all measurement points.

RS-485 bus should be equipped with termination resistors (100-150 ohm) on

both ends. The bus must not be ramified, and longer than 1 km.

Figure 4.5. Example application of the transducers

The PT-100 sensor can be connected to the device in typical -wire circuit (Figure .6 a),

3-wire circuit (Figure .6 b) or 2-wire circuit (Figure .6 c). Due to precision of measurement

-wire circuit is recommended.

If 2 wire circuit is used, the resistance of wires should be as small as possible, to

avoid of measurement errors. Measured value can be corrected (constant

correction) writing 06h register (measurement scale offset). Due to low precision 2-

wire connection is not recommended. Resistance of 0,3Ω causes with increasing of

results about 1°C. Simultaneously to increasing of wires resistance, increases

measurement error.

Measurement modules

converter

RS-232

RS-485

Control panel

PC host

User manual for - TEMPERATURE TRANSDUCER TRS-02a

a) b) c)

Figure 4.6. Connection of sensors:

a) 4-wires circuit; b) 3-wires circuit; b) 2-wires circuit;

The connection circuit should not be changed while unit is powered. Every change

of connection while the unit is powered causes measurement errors by several

seconds after change.

4.4. MAINTENANCE

The unit does not have any internal replaceable or adjustable components available to

the user. Pay attention to the ambient temperature in the room where the unit is operating.

Excessively high temperatures cause faster ageing of the internal components and shorten the

fault-free time of unit operation.

In cases where the unit gets dirty do not clean with solvents. For cleaning use warm water with

small amount of detergent or in the case of more significant contamination ethyl or isopropyl

alcohol.

Using any other agents can cause permanent damage to the housing.

Product marked with this symbol should not be placed in municipal waste. Please

check local regulations for disposal and electronic products.

Pt100

Ra Rb Rc Rd

Ra, Rb, Rc, Rd can be different

7 8 9 10

Pt100

Rb Rc

8 97 10

Rb, Rc can be different

n.c. n.c.

Pt100

Ra Rb Rc

8 1097

Ra = Rb = Rc

n.c.

User manual for - TEMPERATURE TRANSDUCER TRS-02a

5. PRINCIPLE OF OPERATION

TRS-02a module is equipped with IC analog to digital converter of 16 bits resolution.

Converted measurement signals are transmitted to the microcontroller where they are

computed and filtered according to given parameters. Measurement data can be readed from

the module via RS- 85 interface by any MASTER controller (i.e. Control panel or PC). In

factoring process, the same address (0xFE) is written to every module. These addresses can

be changed at any time using proper MODBUS commands, or can be forced to be reset to

0xFF value using module internal momentary switch (to enhance system installation process,

see: FORCING OF 0xFF ADDRESS). All settings are stored in non-volatile EEPROM memory,

and available under fixed register numbers.

LED indicator is installed in the module mainboard, it indicates following situations:

• normal operation mode - flashes every about 2 second.

• handmade forcing of address 0xFF - permanent light

6. THE MODBUS PRO TOCOL HANDLING

Transmission parameters: 1 start bit, 8 data bits, 1 stop bit, no parity control

Baud rate: 9600 bits/second

Transmission protocol: MODBUS RTU compatible

The device parameters and measurement result are available via RS- 85 interface, as

HOLDING-type registers of Modbus RTU protocol. The registers (or groups of the registers)

can be read by 03h function, and wrote by 06h (single register only) accordingly to Modbus

RTU specification. Maximum group size for 03h function can not exceeds 5 registers (for single

frame).

The device interprets the broadcast messages, but then do not sends the answers.

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