HCFA TX2N-4AD-PT Manuel utilisateur

+11,120

-148°F

-1,480 +1,112°F

Digital

output

Temp.input°F

+6,000

-100℃

-1,000 +600℃

Digital

output

Temp.input℃

1 2 3

This manual contains texts, diagrams and explanations which will guide the reader in the

correct installation and operation of TX2N-4AD-PT. This manual should be read and

understood carefully before attempting to install or use the unit.

1. Introduction

• The TX2N-4AD-PT analog block amplifies the input from four platinum temperature

sensors (Pt 100, 3 wire, 100 Ω) and converts the data into 12 bit reading’s stored in the

main unit. Both Centigrade (°C) and Fahrenheit (°F) can be read. Reading resolution is 0.2°C

to 0.3°C / 0.36°F to 0.54°F.

• The TX2N-4AD-PT can connected to the LX1N/HCA2/HCA5/TX3U/HCA8/HCA8C series

Programmable Controllers (PLC).

• All data transfers and parameter setups are adjusted via software control of the TX2N-

4AD-PT; by use of the TO/FROM applied instructions in the PLC.

• The TX2N-4AD-PT occupies 8 I/O points on the PLC expansion bus. The 8 I/O points can

be allocated from either inputs or outputs. The TX2N-4AD-PT draws 30mA from the 5V rail

of the main unit or powered extension unit.

2. External dimensions

Weight: Approx. 0.3 kg (0.66 lbs) Dimensions: mm (inches)

3. Connection with PLC

TX2N-4AD-PT User’s Manual

3.1 Connection with PLC

The TX2N-4AD-PT unit can be connected to the PLCs as follows. Restrictions apply to the

maximum number of connectable units, depending on the DC24V/DC5V Power Supply

capacities and the Main Unit/ Special Function Unit types. For details, refer to the respective

PLC manual.

HCA5/HCA8/TX3U : The maximum connectable units is 8.

HCA8C*1 : The maximum connectable units is 8.

To connect the TX2N-4AD-PT with the HCA8C main unit, HCA8C-CNV5V

-TX2N is required.

LX1N/HCA2 : The maximum connectable units is 8.

*1 Up to 7 units can be connected to an HCA8C-16X16YT PLC.

3.2 Special function block numbers

Other special units of blocks that use FROM/TO instructions, such as analog input blocks,

analog output blocks and high-speed counter blocks, can be directly connected to the main

unit of the PLC or to the right side of other extension blocks or units.

4. Wiring

4.1 Wiring

The cable of the Pt 100 sensor or a twisted shielded

cable should be used for the analog input cable. This

analog input cable should be wired separately from

power lines or any other lines which may induce noise.

The three wire method improves the accuracy of the

sensors by compensating voltage drops.

If there is electrical noise, connect the FG (frame

ground) terminal with the ground terminal. (In CH1,

there is no FG terminal. Use FG terminal of other

channels.

Connect the ground terminal on the TX2N-4AD-PT

unit with the grounded terminal on the main unit. Use

grounding on the main unit, if grounding is possible.

Either an external or the 24V built-in supply in the PLC

may be used.

4.2 Using crimp terminations

Wire only to the module terminals discussed in this

manual. Leave all others vacant.

Secure the terminal using a tightening torque of

between 0.5 and 0.8N·m.

Use crimp terminals as indicated on the left.

5. Installation notes and usage

5.1 General specification

500V AC, 1min (between all terminals and ground)

Item Specification

General specifications Same as those for the main unit

Dielectric withstand voltage

5.2 Power supply specification

5V DC, 30mA (internal power supply from the main unit)

Item Specification

Analog circuits 24V DC ± 10%, 50mA

Digital circuits

5.3 Performance specification

Analog Inputs

Item Centigrade Fahrenheit

Both °C and °F are available by reading the appropriate buffer memory (BFM).

Analog input

signal

Platinum Temperature Pt 100 sensors (100 Ω), 3-wire, 4-channel

(CH1, CH2, CH3, CH4), (DIN 43760, JIS C 1604-1997, JIS C 1604-1981)

Current to sensor

1 mA. sensor: 100 ΩPt 100

Conversion

Characteristics

Miscellaneous

The block occupies 8 I/O points

(can be either inputs or outputs)

Item Specification

Isolation

Photo-coupler isolation between analog and digital circuits.

DC/DC converter isolation of power from the main unit.

No isolation between analog channels

Number of occupied I/O points

6. Allocation of buffer memories (BFM)

6.1 Buffer memories

BFM CONTENTS

*#0

*#1 - #4

*#28

#29

#30

#31

#5 - #8

#9 - #12

#13 - #16

#17 - #20

#21 - #27

Reserved

Characteristic change

Ch1 to CH4 Averaged temperature reading to

be averaged (1 to 256) Default = 8

Ch1 to CH4 Averaged temperature in 0.1°C units

Ch1 to CH4 Present temperature in 0.1°C units

Ch1 to CH4 Averaged temperature in 0.1°F units

Ch1 to CH4 Present temperature in 0.1°F units

Reserved

Digital range error latch

Error status

Identification code K2040

The TX2N-4AD-PT communicates

with the PLC via buffer memories.

BFMs (buffer memories) #21 to

#27 and #31 are reserved.

All BFM data can be read by the

PLC using the FROM instruction.

PLC can read/write the BFMs

(marked with “*” ), using FROM

/TO instructions.

BFM #0 value (K0 or K1) decides the Pt100 characteristic to be used.

K0 : JIS C 1604-1997

K1 : JIS C 1604-1981

The number of samples to be averaged are assigned in BFMs #1 to #4. Only the range

1 to 4096 is valid. Values outside this range are ignored. The default value of 8 is used.

A number of recently converted readings are averaged to give a smoother read out.

The averaged data is stored in BFMs #5 to #8 and #13 to #16.

BFMs #9 to #12 and #17 to #20 store the current value of the input data. This value is

in units of 0.1°C or 0.1°F, but the resolution is only 0.2°C to 0.3°C or 0.36°F to 0.54°F.

TX2N-4AD-PT User’s Manual TX2N-4AD-PT User’s Manual

TX2N-4DA-PT

TX2N-32ER

X050-X067

Y030-Y047

TX2N-4AD-PT

Special block

No.2

①

②

③

④

For additional data regarding EMC considerations

please see section 10.

Compensated

range

Digital output

Minimum

resolvable temp.

-100°C to +600°C

-1000 to 6000

0.2°C to 0.3°C

-148°F to +1112°F

-1480 to +11120

12-bit conversion 11 data bits +1 sign bit 16-bit binary with sign

0.36°F to 0.54°F

Overall accuracy

Conversion speed

± 1% full scale (compensated range)

See section 7.0 for special EMC considerations

60ms (15 ms for 4 channels)

Analog Inputs continued...

2N-4AD-PT User’s Manual

TX2N-4AD-PT

4 5 6

7. System block diagram

9.1 Preliminary checks

6.2 Status Information

1) Buffer Memory BFM #28: Digital range error latch

BFM #29 b10(digital range error) is used to judge whether the measured temperature is

within the unit’s range or not.

BFM #28 latches the error status of each channel.

b6 b5 b4 b3 b2 b1 b0

High Low High Low High Low High Low

CH4 CH3 CH2 CH1

b7b15 or b8

Not used

Bit devices of BFM #29 ON OFF

b0 : Error

When either b2 or b3 is ON

A/D conversion is stopped

for the error channel

No error

b1 : Reserved Reserved Reserved

Reserved Reserved

b2 : Power source 24V DC power supply failure. Power supply normal

b3 : Hardware error A/D converter or other hardware

failure Hardware Normal

b4 to b9 : Reserved

b10 : Digital range error

Digital output/analog input

value is outside the specified

range

Digital output value is normal.

b11 : Averaging error

Selected number of averaged

results is outside the available

range -see BFM #1 to #4

Averaging is normal.

(between 1 to 4096)

b12 to b15 : Reserved

8. Example program

In the program shown below, the TX2N-4AD-PT block occupies the position of special block

number 2 (that is the third closest block to the PLC). The averaging amount is four. The

averaged values in degrees C of input channels CH1 to CH4 are stored respectively in data

registers D0 to D3.

FROM

Initiali-

zation

Pulse

M8002 FNC78 K2 K30 D10 K1

FNC10

CMP

FROM

K2040 D10 M0

Y010

M8000

RUN

monitor

FNC78 K2 K29 K4M10 K1

FROM

M10

M8000 FNC78 K2 K29 K4M10 K1

FROM

M10

M20

Y011

Y010

M1 FNC79 K2 K1 K4 K4

FNC78 K2 K5 D0 K4

Block No.2 BFM #30 →(D10)

Identification code

When (K2040) = (D10), M1 = ON

i.e. When identification code is K2040, M1 = ON

This initial step checks that the special function block placed at position 2 is actually a

TX2N-4AD-PT, i.e. its unit identification number is 2040 (BFM #30).

This step is optional, but it provides a software check that the system has been

configured correctly.

This step provides optional monitoring of the TX2N-4AD-PT Error Buffer Memory (#29). If

there is an Error on the TX2N-4AD-PT, bit b0 of BFM #29 will be set on.

This can be read by this program step, and output as a bit device in the PLC (Y010 in this

example). Additional Error devices can be output in a similar manner, i.e. b10 BFM #29.

(see below)

Block No.2 BFM #29 →(K4M10)

Transfer the error status to (M25 to M10).

When error is found, M10 = ON.

Represents b0 BFM #29

Represents b10 BFM #29

(K4) →(BFM #1 to #4)

Number of samples is changed to four on CH1 to Ch4

(BFM #5 to #8) →(D0 to D3)

Transfer the averaged temperature

value in °C to the data registers.

This step is the actual reading of the TX2N-4AD-PT input channels. It is essentially

the only program step which is needed. The "TO" instruction in this example, sets

the input channels, CH1 to CH4, to take the average reading of four samples.

The "FROM" instruction reads the average temperatures (BFM #5 to #8) for input

channels CH1 to CH4 of the TX2N-4AD-PT. If direct temperature readings are

required BFM #9 to #12 should be read instead, ex.

FROM

FNC78 K2 K9 D0 K4

No. of

words read

special

block No.2

TX2N-4AD-PT

BFM number

result

destination

9. Diagnostics

I. Check whether the input/output wiring and/or extension cables are properly connected

on the TX2N-4AD-PT analog special function block.

II. Check that the PLC system configuration limits have not been exceeded, i.e. the number

of special function blocks, and the total system I/O are within the specified range.

III. Ensure that the correct operating range has been selected for the application.

IV. Check that there is no power overload on either the 5V or 24V power sources, remember

the loading on main unit or a powered extension unit varies according to the number of

extension blocks or special function blocks connected.

V. Make sure that the main unit has been switched to RUN

9.2 Error checking

If the TX2N-4AD-PT special function block does not seem to operate normally, check the

following items.

Check the status of the POWER LED.

Lit : The extension cable is properly connected.

Otherwise : Check the connection of the extension cable.

Check the external wiring.

Check the status of the “24V” LED (top right corner of the TX2N-4AD-PT).

Lit : TX2N-4AD-PT is ON, 24V DC power source is ON.

Otherwise : Possible 24V DC power failure, if ON possible TX2N-4AD-PT failure.

Check the status of the “A/D” LED (top right corner of the TX2N-4AD-PT).

Lit : A/D conversion is proceeding normally.

Otherwise : Check buffer memory #29 (error status). If any bits (b0, b2, b3) are ON,

then this is why the A/D LED is OFF.

10. EMC Consideration

Electromagnetic compatibility or EMC must be considered before using the TX2N-4AD-PT.

HCFA recommend that the PT 100 sensors used, should be fitted with a form of seild or

screening as protection against EMC noise.

If some form of cable protection is used, the“Shield”must be terminated at the

terminals as shown in section 4.1.

Because of the delicate nature of all analog signals, failure to take good EMC precautions

could lead to EMC noise induced errors; up to ±10% of actual values. This is an absolute

worst case figure, users who do take good precautions can expect operation within normal

tolerances.

EMC considerations should include selection of good quality cables, good routing of those

cables away from potential noise sources.

Additionally it is recommended that signal averaging is used as this will reduce the effects of

random noise “spikes”.

Low : Latches ON when the temperature measurement data drops below the lowest

temperature measurement limit.

High : Turns ON when the temperature measurement data rises above the highest

temperature measurement limit.

When an error occurs the temperature data before the error is latched. If the measured

value returns to within valid limits the temperature data returns to normal operation. (Note:

The error remains latched in (BFM #28))

An error can be cleared by writing K0 to BFM #28 using the TO instruction or turning off the

power.

2) Buffer Memory BFM #29: Error status

3) Buffer Memory BFM #30: Identification Code

The identification code or ID number for this Special Block is read from buffer memory BFM

#30 using the FROM instruction. This number for the TX2N-4AD-PT unit is K2040.

The PLC can use this facility in its program to identify the special block before commencing

data transfer from and to the special block.

TX2N-4AD-PT Analog Block

M8000

TX2N-4AD-PT User’s Manual TX2N-4AD-PT User’s Manual TX2N-4AD-PT User’s Manual

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