"user manual"
Contents
1. 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 CONTENTS o F 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 M 0 2 13 16 Ch1 to CH4 Averaged temperature in 0 1 F units 17 20 Ch1 to CH4 Present temperature in 0 1 F units 27 30 Reserved Digital range error latch Error status Identification code K2040 Reserved 1 BFM 0 value KO or K1 decides the Pt100 characteristic to be used KO JIS C 1604 1997 K1 JIS C 1604 1981 2 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 3 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 4 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 A HCFA HCFA CORPORATION LIMITED TX2N 4AD PT User s Manual 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 measured2. DC 10 50mA Digital circuits 5V DC 30mA internal power supply from the main unit 3 HCFA HCFA CORPORATION LIMITED TX2N 4AD PT User s Manual 5 3 Performance specification Analog Inputs Stem Centigrade Fahrenheit Item Both C and F are available by reading the appropriate buffer memory BFM Analog input Platinum Temperature Pt 100 sensors 100 Q 3 wire 4 channel signal CH1 CH2 CH3 CH4 DIN 43760 JIS C 1604 1997 JIS C 1604 1981 Compensated range 100 C to 600 C 148 F to 1112 F l 1000 to 6000 1480 to 11120 Digital output 12 bit conversion 11 data bits 1 sign bit 16 bit binary with sign Minimum P resolvable temp 0 2 C to 0 3 C 1 full scale Compensated range See section 7 0 for special EMC considerations 60ms 15 ms for 4 channels Analog Inputs continued 0 36 F to 0 54 F Overall accuracy Conversion Characteristics j Digital f Digital output Output l 600 C lt e 1 1 112 F gt Temp input F Miscellaneous Photo coupler isolation between analog and digital circuits DC DC converter isolation of power from the main unit No isolation between analog channels The block occupies 8 I O points Number of occupied 1 0 points can be either inputs or outputs 6 Allocation of buffer memories BFM 6 1 Buffer memories The TX2N 4AD PT communicates with the PLC via buffer memories BFMs buffer memories
3. may induce noise LTG The three wire method improves the accuracy of the sensors by compensating voltage drops Pt100 1 i poo eee See l If there is electrical noise connect the FG frame ANC wi ground terminal with the ground terminal In CH1 oOo E a there is no FG terminal Use FG terminal of other DC24V 10 50mA QI 53 channels TO a SS ET peoe Connect the ground terminal on the TX2N 4AD PT Hoonvener gt isv unit with the grounded terminal on the main unit Use Ji D grounding PLC TX2N 4AD PT 100 or less t _ _ _ 3 24 7 grounding on the main unit if grounding is possible _ Either an external or the 24V built in supply in the PLC 7 may be used ee a Extension cable For additional data regarding EMC considerations please see section 10 4 2 Using crimp terminations less than 5 6 2mm 2 Oun Use M3 0 12 less than 6 2mm 0 24 X Use crimp terminals as indicated on the left X Secure the terminal using a tightening torque of between 0 5 and 0 8N m X Wire only to the module terminals discussed in this manual Leave all others vacant 5 Installation notes and usage 5 1 General specification Specification General specifications Same as those for the main unit Dielectric withstand voltage 500V AC 1min between all terminals and ground 5 2 Power supply specification Specification Analog circuits 24V
4. 1 HCFA HCFA CORPORATION LIMITED TX2N 4AD PT User s Manual X2N 4AD PT User s Manual 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 e The TX2N 4AD PT analog block amplifies the input from four platinum temperature sensors Pt 100 3 wire 100 QO 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 e The TX2N 4AD PT can connected to the LXIN HCA2 HCA5 TX3U HCA8 HCA8C series Programmable Controllers PLC e 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 e 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 Ibs Dimensions mm inches 87 3 43 55 2 17 Mounting holes DIN rail mounting slot 35 1 38 90 3 54 TX2N 4AD PT ss eenee rrr Extension cable Terminal screws M3 0 12 and connector 3 Connection with PLC 3 1 Connection with PLC
5. 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 LXIN HCA2 The maximum connectable units is 8 1 Up to 7 units can be connected to an HCA8C 16X16YT PLC J HCFA HCFA CORPORATION LIMITED TX2N 4AD PT User s Manual 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 TX2N 4DA PONERO my o o DA oe HCA5 24X24YR A TX2N 4AD TX2N 16EX TX2N 4DA TX2N 32ER TX2N 4AD PT X000 X027 Special block X030 Special block X050 X067 Special block Y000 Y027 X047 Y030 Y047 No 2 4 Wiring 4 1 Wiring Pioo gt 5V The cable of the Pt 100 sensor or a twisted shielded shielded_CH1 4 7K gt 44 7K cable should be used for the analog input cable This WO H TR T gt Loot analog input cable should be wired separately from ed i ae __ t G power lines or any other lines which
6. X2N 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 b11 Averaging error 7 System block diagram POWER i LED gt SV Power Gain and offset PLC Supply j J values are A N stored in the Command TO i EEPROM information Analog Input write and Photocoupler data status j CPU iii FROM a ry CH1 N _ AD pa Bi CH2 System 4 gt CH3 ROM N converter Control 4 N ss gt CH4 _ signals _ 4 La md V Multiplexer 24V DC Ag 15V pe LAD Power Source 9E l zj O LED DC DC sv gt sv Cyelic switching 75 converter y2 x A LED TX2N 4AD PT Analog Block 5 HCFA HCFA CORPORATION LIMITED TX2N 4AD PT User s Manual 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 DO to D3 M8002 rF FNC78 Block No 2 BFM 30 D10 K2 K30 D10 K1 Initiali FROM Identification code zation Pulse E ENC10 When K2040 D10 M1 ON cmp 2040 D10 MO i e When identification code is K2040 M1 ON This initial step checks that the special function block plac
7. ed 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 M8000 ea K2 K29 K4M10 K1 Block No 2 BFM 29 K4M10 RUN Transfer the error status to M25 to M10 monitor When error is found M10 ON 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 bO 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 Represents b0 BFM 29 M8000 F FNC78 FROM K2 K29 K4M10 K1 M10 Represents b0 BFM 29 M20 Represents b10 BFM 29 M1 FNC79 E i KA 4 K4 gt BFM 1 to 4 or TO Number of samples is changed to four on CH1 to Ch4 M8000 FNC78 BFM 5 to 8 DO to D3 FROM So DOBA 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 requi
8. he 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 FG 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 HCFA 7R JIL BR fis
9. red BFM 9 to 12 should be read instead ex FNC78 FROM K2 K9 DO K4 special TX2N 4AD PT result No of block No 2 BFM number destination words read 9 Diagnostics 9 1 Preliminary checks 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 6 HCFA HCFA CORPORATION LIMITED TX2N 4AD PT User s Manual 9 2 Error checking If the TX2N 4AD PT special function block does not seem to operate normally check the following items CE 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 CE 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 te Check t
10. temperature is within the unit s range or not BFM 28 latches the error status of each channel a CH4 CH3 CH2 CH1 b15 or b8 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 KO to BFM 28 using the TO instruction or turning off the power 2 Buffer Memory BFM 29 Error status Bit devices of BFM 29 When either b2 or b3 is ON A D conversion is stopped for the error channel b1 Reserved 24V DC power supply failure Power supply normal A D converter or other hardware Herd N failure ardware Norma b4 to b9 Reserved Digital output analog input value is outside the specified range b0 Error No error b3 Hardware error b10 Digital range error Digital output value is normal Selected number of averaged aor results is outside the available a range see BFM 1 to 4 b12 to b15 Reserved 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 T
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