Simex SPT-86L Manuel utilisateur

Assisting the automation

industry since 1986

User manual

for RTD,TC,mV/ -20mA converter

module

SPT-86L

•Firmware: v.1.00 or higher

Read the user's manual carefully

before starting to use the unit or software.

Producer reserves the right to implement changes without prior notice.

31.05. 011 SPT-86L_INSSXEN_v.1.00.000

User manual for RTD,TC,mV/4-20mA converter module SPT-8 L

CONTENTS

1. BASIC REQUIREMENTS AND USER SAFETY........................................................................................2

2. GENERAL CHARACTERISTICS................................................................................................................3

3. TECHNICAL DATA......................................................................................................................................3

4. DEVICE INSTALLATION............................................................................................................................5

4.1. UNPACKING.......................................................................................................................................5

4.2. ASSEMBLY........................................................................................................................................5

4.3. CONNECTION METHOD...................................................................................................................6

4.4. MAINTENANCE..................................................................................................................................7

5. PRINCIPLE OF OPERATION.....................................................................................................................8

5.1. VOLTAGE MEASUREMENT.............................................................................................................8

5.2. CURRENT OUTPUT CONTROL........................................................................................................9

5.3. ORCING O ADDRESS H........................................................................................................10

5.4. DETECTION O THE PEAK VALUES............................................................................................11

6. MEASURED VALUES CALCULATION....................................................................................................11

6.1. ADDITIONAL CALCULATIONS (USED CONVERSION CHARACTERISTIC)...............................12

6.1.1. Linear characteristic................................................................................................................12

6.1.2. Square characteristic..............................................................................................................12

6.1.3. Square root characteristic.......................................................................................................13

6.1.4. User defined characteristic.....................................................................................................13

6.2. EXAMPLES O CALCULATIONS...................................................................................................14

7. CURRENT OUTPUT VALUE CALCULATION.........................................................................................17

8. THE MODBUS PROTOCOL HANDLING.................................................................................................18

8.1. LIST O REGISTERS......................................................................................................................18

8.2. TRANSMISSION ERRORS DESCRIPTION....................................................................................20

8.3. EXAMPLES O QUERY/ANSWER RAMES.................................................................................21

. DEFAULT AND USER'S SETTINGS LIST...............................................................................................23

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

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.

User manual for RTD,TC,mV/4-20mA converter module SPT-8 L

- 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.

- 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 authorized service centre.

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

not be used in a household environment or similar.

2. GENERAL CHARACTERISTICS

The S T-86L module is an isolated temperature and voltage to current (in 4- 0 mA

standard) converter. The device is equipped with one voltage input (0-150 mV), one RTD input

(Pt 100/500/1000) and one TC (thermocouple) input (K, S, J, T, N, R, B, E). The device

automatically compensates the cold junction temperature. Both RTD and TC inputs have full

linearisation of characteristics. Only one type of input can be used at a time. Ranges of

individual inputs are given in the next chapter. The module is able to detect a break of any of

the measurement wire. The measurement after being processed according to the scale given

by the user is used to drive the passive current output.

The configuration of the device can be done on request or by the user. The

communication with the device is through RS-485 interface with Modbus RTU protocol.

The supply input together with RS-485 interface, measurement input and current output

are all galvanically isolated from each other.

3. TECHNICAL DATA

Power supply voltage 16...24...36V DC (separated)

External fuse (required) T - type, max. 1 A

Current consumption typically 0.65 W

Voltage input (150mV range) 0÷60 mV, 0÷75 mV, 0÷100 mV, 0÷150 mV

Voltage measurement accuracy ± 0.1% @ 5°C; ± one digit (for 0÷150 mV range)

Voltage input resistance > 1,5 MΩ

Accepted prolonged input overload + 0%

User manual for RTD,TC,mV/4-20mA converter module SPT-8 L

RTD input (resistive) Pt 100, Pt 500,Pt 1000

Measurement range -100°C ÷ +600°C

Measurement accuracy ± 0.1% @ 5°C; ± one digit

Measurement wires resistance max. 0 Ω (every wire)

Thermocouple input K, S, J, T, N, R, B, E

Thermocouple input range K: - 00˚C ÷ +1370˚C

S: -50˚C ÷ +1768˚C

J: - 10˚C ÷ +1 00˚C

T: - 00˚C ÷ + 400˚C

N: - 00˚C ÷ +1300˚C

R: -50˚C ÷ +1768˚C

B: + 50˚C ÷ +18 0˚C

E: - 00˚C ÷ +1000˚C

Measurement accuracy K, J, E: ± 0.1% @ 5°C; ± one digit

N: ± 0. % @ 5°C; ± one digit

S, T, R, B: ± 0.5% @ 5°C; ± one digit

Accuracy of cold ends temperature

compensation

± 1˚C

Temperature stability 50 ppm / °C

Galvanic isolation Supply input together with RS-485 interface,

measurement input and current output are all

galvanically isolated from each other

Passive current output range max. .8 ÷ 4 mA,

supply voltage: Us = 9.5 ÷ 36 V

load resistance 0...(Us - 9.5V) / 4mA [kΩ]

resolution: 1 bits

Communication interface RS-485, 8N1 and 8N , Modbus RTU, not separated

from power supply circuit

Baud rate 1 00 bit/s ÷ 115 00 bit/s

Number of modules in 1 network maximum 1 8

Data memory non-volatile memory, EEPROM type

Protection level IP 0

Housing type

Housing dimensions (L x W x D)

DIN rail mounted (35 mm rail)

101 x .5 x 80 mm

User manual for RTD,TC,mV/4-20mA converter module SPT-8 L

Operating temperature

Storage temperature

Humidity

Altitude

0°C to +50°C

-10°C to +70°C

5 to 90% no condensation

up to 000 meters above sea level

Screws tightening max. torque 0.5 Nm

Max. connection leads diameter .5 mm

EMC according to: PN-EN 613 6-1

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.

4. DEVICE INSTALLATION

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.

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

- Ensure that the power supply network voltage corresponds to the nominal

voltage stated on the unit’s identification label.

- The load must correspond to the requirements listed in the technical data.

- 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:

- user’s manual,

- warranty,

4.2. ASSEMBLY

- Disconnect the power supply prior to starting assembly.

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

User manual for RTD,TC,mV/4-20mA converter module SPT-8 L

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.

- In order to secure against accidental short circuit the connection cables must be

terminated with appropriate insulated cable tips.

- 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.

- In the case of the unit being fitted with separable clamps they should be inserted

into appropriate connectors in the unit, even if they are not used for any

connections.

- 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.

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.

–Use of screened signal cables is recommended. Signal cable screens should be

connected to the earthing only at one of the ends of the screened cable.

–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-485 serial transmission connections.

–In the case of interference from the power supply side the use of appropriate anti-

interference filters is recommended. Bear in mind that the connection between the filter

and the unit should be as short as possible and the metal housing of the filter must be

connected to the earthing with largest possible surface. The cables connected to the filter

output must not run in parallel with cables with interference (e.g. circuits controlling relays

or contactors).

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

screw connections on the front and bottom of the unit’s housing.

User manual for RTD,TC,mV/4-20mA converter module SPT-8 L

ig. 4.1. Method of cable insulation replacing and cable terminals

• When use of SM S it is strongly recommended to connect E wire.

• All connections must be made while power supply is disconnected !

ig. 4.2. Terminals description

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.

6-7 mm

max. mm

PASSIVE current

output 4 ÷ 20mA

(polarization doe n't

matter)

bottom view

RS-485

SLAVE

RUN

ERROR

5 6 7 8

+Us A+ B- -Us

power upply

ground

power upply

+24V DC

front view

force addre 0xFF wich

i available through thi hole

3 2 1

RS-485 3 2 1

4 3

RTD RTD

4 1

User manual for RTD,TC,mV/4-20mA converter module SPT-8 L

5. PRINCIPLE OF OPERATION

S T-86L module allows the conversion of temperature and voltage on current in 4- 0 mA

standard. Present value of temperature or voltage is available as measurement register of

device (reg. addr. 01h). If input signal exceeds the permissible range, shortcut or break of

measurement circuit occur, appropriate error code will be set in status register (register 0 h).

Measurement input's parameters are located in the group of registers ”Input” (see LIST

OF REGISTERS on page 18) and allow:

• input type selection (parameter ”InputType”)

• connection type selection (parameter ”InputConn”, applies only to RTD measurement),

• change of the filtration degree of the values in measurement register (parameter

”InputFilter”),

• shift of the measurement scale (parameter ”InputOffset”, applies only to temperature

measurement),

• processing characteristic setup (applies only to voltage measurement).

The proper operation of the module is signalized by flashing green LED diode placed on

the front panel and labelled RUN. The yellow LED diode (labelled RS-485), by fast flashes,

signalizes data transmission via serial interface. The red LED diode (labelled ERROR), if lit,

signalizes measurement error. It may mean that measured signal exceeded the permissible

range, the sensor was damaged or wires' short circuit or break occurred.

Parameters are kept in non-volatile EEPROM memory. All parameters can be set via

serial interface (see LIST OF REGISTERS on page 18).

5.1. VOLTAGE MEASUREMENT

Measurement results can be internally recalculated due to one of available

characteristics: linear, square, square root or user definable multipoint (max. 0 points length).

The expansion of nominal range is defined by ”InputHiRange” parameter (see figure below).

ig. 5.1 Example of definition of permissible range of input signal - ”InputHiRange”

parameter (0-100 mV mode)

”InputHiRange” = 5,0 % (5 mV)

105

permissible measurement range

nominal measurement range (0-100 mV)

[mV]

100 1 00

Umax

range exceeded range exceeded

User manual for RTD,TC,mV/4-20mA converter module SPT-8 L

If input signal exceeds the permissible range, appropriate code in status register (register

0 h) will be set.

Parameter ”InputHiRange” determines the upper border of the permissible range

accordingly to the expression (for all voltage modes). For example, if input is set to 0-100 mV

mode, then the upper border is calculated due to expression:

Umax = 100 mV + 100 mV × ”InputHiRange” %.

Value of ”InputHiRange” can be set from 0 to 19.9% (the procedure of calculating the input

voltage range is presented in the example no 1 on the page 14).

When linear, square or square root characteristic is chosen then the value returned to the

measurement register (register 01h) is defined by ”InputLow” and ”InputHigh” parameters.

These parameters describe the values returned for minimum and maximum input value. For

example, if input type is set to 0-100 mV, ”InputLow” parameter defines the returned value

when input voltage equals 0 mV, and ”InputHigh” parameter defines the returned value for

100 mV. Available range for these parameters: -999 ÷ 9999.

When user defined multipoint characteristic is chosen then the value returned in

measurement register (register 01h) is calculated according to coordinates defined by user (X,

Y points, maximally 0 points). Coordinate ”X” defines the percentage ratio of input value to

selected measurement range. The „X” range: -99,9 ÷ 199,9. Coordinate ”Y” defines the value

(returned in measurement register) for particular ”X” coordinate. The ”Y” value can be changed

in range: -999 ÷ 9999.

5.2. CURRENT OUTPUT CONTROL

Way of processing the measurement to the current value is determined by the

parameters contained in the "Output" group of parameters (see LIST OF REGISTERS on

page 18).

The current output can be controlled on the basis of the measurement result or on the

basis of the value written to the register 05h via the serial interface (remote control mode via

RS-485).

In control mode using the measurement result parameter ”OutLow” defines the

measurement value for which current equal 4 mA will be generated, while the parameter

”OutHigh” defines the measurement value for which current equal 0 mA will be generated.

Output current for any result can be calculated from the formula:

Iout=W−"OutLow"

"OutHigh"−"OutLow" ×16 mA4mA

where ”W” is a measurement value in the register (01h or 06h - depending on the parameter

”HoldOut”).

•In control mode based on the measurement result the current output can be

controlled by the present value (register 01h) or by the stored peak value

(register 06h, in the case of using the peak detection function - see parameter

”HoldOut”).

• Value of parameter ”OutLow” can be greater than the value of parameter

”OutHigh”. In this case, the characteristic of the current output is reversed (ie,

User manual for RTD,TC,mV/4-20mA converter module SPT-8 L

when the measured value is increasing the output current is decreasing).

Parameters ”OutLoRange” and ”OutHiRange” define the permissible output current

range beyond the nominal range 4- 0 mA. If the calculated current Iout would exceed the

permissible range, the output would generate current equal to the upper or lower border of the

range. Parameter ”OutLoRange” defines the lower border of the range due to formula:

Imin = 4 mA - 4 mA × ”OutLoRange” %

Parameter ”OutLoRagne” can be set from 0 to 9.9%. Parameter ”OutHiRange” defines the

lower border of the range due to formula:

Imax = 0 mA + 0 mA × ”OutHiRange” %

Parameter ”OutHiRange” can be set from 0 to 19.9%.

The minimum current which can flow in the current output's circuit is about .5 mA. It

occurs when the current output is disabled (parameter ”OutMode”). This is the current

needed to power the current output circuit.

Parameter ”OutAlarm” defines how the current output reacts in the critical situation

(exceeding the permissible range, shorting or opening measuring inputs). In such a situation

the output current will be unchanged or will be set to the desired value (depending on the

parameter ”OutAlarm”).

•Critical situation is signalized by the red LED (labeled ERROR).

• After resolution of the critical situation output current returns to the value

determined on the basis of the measurement result.

• Before turning off the device it is recommended to first disable the current output's

power supply, and then the device itself. If the current output is supplied while the

device itself is turned off, the output current will be about 7.5 mA.

5.3. FORCING OF ADDRESS FFH

New devices has set to Modbus addresses FEh. To enhance system installation process

special operation mode has been developed. It allows to force address FFh in single module

using internal momentary switch mounted on module mainboard (fig. 4.1). Switch is accessible

through a small hole in .the front panel.

To change address of the device to FFh, wait for a moment after power up until green

LED (RUN) starts flashes. Next press and hold push-button about 4 seconds until green LED

will lights permanently, then release push-button.

The device changes its MODBUS address to FFh and waits for a new address

(readdressing). Green LED (RUN) stay permanently on until readdressing via RS-485, or

power off. While module is in this state it is possible to control its inputs, and communication is

possible using temporal address FFh.

At this moment MASTER controller should find new device and readdress it (to address

other than FFh and FEh). After remote readdressing green LED indicator starts to flashes

again.

Simultaneously with change of device address, its baud rate is changed to

9600 bit / s. Required transmission speed (1 00 bit/s. to 115 00 bit/s.) can be set by write to

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