Digital Measurement Amplifier Type DK900 Instructions for adjusting and starting MESOMATIC Automation und Messtechnik GmbH Siemensstr. 36 D-71394 Kernen i.R. Tel.
Copyright © 2004 - 2007 by Mesomatic GmbH D-71394 Kernen i.R.
Table of contents 1. Application....................................................... 1 2. 2.1. 2.2. 2.3. 2.4. 2.5. 2.6. 2.7. 2.8. Configuration..................................................... 2 Profibus DP address............................................... 3 Scale............................................................. 4 Filter............................................................ 4 Zero point........................................................ 4 Adjustment.....................
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen 1. Application The DK900 Measuring Amplifier is a universal instrument for the evaluation of small analog signals. Its main field of application is weighing technology where the instrument is operated together with load cells. As a matter of course, any other sensor with an electric analog output signal allows to be connected to this amplifier as well.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen 2. Configuration The configuration and adjustment (start/end adjustment) of the scales is done via a PC/notebook PC (WIN98 or higher). The respective programme is delivered together with the instrument, on a floppy disk. The procedure is as described below: - Connect the DK900 to the scales. Connect the X2 serial interface with the PC (COMx). Apply an operating voltage of 24 VDC. Turn on the PC and start the configuration programme (DK900CFG_engl.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen The current configuration data of the DK900 will now be displayed: Fig. 2 The fields in the Configuration window must be filled in as follows: 2.1. Profibus DP address Enter the instrument address (provided that the PC is equipped with a Profibus). The address may be between 001 and 125.
MESOMATIC 2.2. Automation und Messtechnik GmbH D-71394 Kernen Scale Input field Range of values or option Step size position of dec. point 1 ú 2 ú 5 -4 ... 1 No. scale intervals 1 0 -1 -2 -3 -4 #####0 ##### ####.# ###.## ##.### #.#### EndWeight Steps 100 ... 99999 1st example: Scales with a capacity of 5000 kg and steps of 2 are to be scaled: This means the step is 2. Enter 0 as the decimal point position. The no.
MESOMATIC 2.6. Automation und Messtechnik GmbH D-71394 Kernen Storage of the configuration and calibration data on PC / floppy disk The configuration and calibration data can be stored on the PC, or on a floppy disk, by clicking the 'store' button in the Configuration file section. Fig. 3 Select the path/drive desired, enter a file name and click ' Öffnen '. 2.7.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen Fig. 4 First click the file desired and then click 'Öffnen'. Click the 'take over' button in order to transfer the file selected to the DK900. You may use this procedure to replace a defective device by a new one, for example, without having to perform a re-adjustment with the help of adjustment weights.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen 3. The serial interface 3.1. Connection Data is exchanged between the master computer and the DK910 (slave(s)) via a serial interface (X2). The data format is 8N1, with function F 53 the baud rate can be selected between 9600 and 19200 Baud. 3.2. Commands Commands consist of an '!'=21Hex=33Dec, followed by the actual command character. When the DK800 receives a command, it checks whether it is possible to execute it.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen 4. The Profibus-DP interface 4.1. Connection The bus connector of the Profibus interface has been designed as a 9 pole SUB-D socket in accordance with Profibus standard DIN EN 50170. The socket has been installed in the front panel of the DK900, and been marked “X6”. A bus plug is used to connect the bus cable with the DK900.
MESOMATIC 4.3. 4.3.1. Automation und Messtechnik GmbH D-71394 Kernen Parameterisation of the Profibus-DP Master Design In order to design a Profibus-DP network, the device master data files ("GeraeteStammDaten", GSD files) of all bus participants must be entered in the Profibus Master configuration programme. It may be necessary to enter a "Read in/Save" and/or "Translate" command after this, depending on the master software used. 4.3.2.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen Fig. 7 shows the integration of the GSD file and the parameterisation by the example of a Siemens S7 SPC: 5 3 4 1 2 Fig.7 S7 Hardware configuration Explanations of Fig. 7: 1 Profibus address of the slave device (here 2, for example), this address must correspond to the address entered in the DK900. 2+3 Data channel selected (here the process data channel, for example) 4 Input address (here 200..
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen Proceed with any other SPC makes and computers accordingly. Fig. 8 shows the SFC14 "DPRD_DAT" function called to read out data from the DK900: 2 5 6 4 3 1 Fig. 8 SFC14 "DPRD_DAT Explanations of Fig. 8: 1 SFC14 system function 2 System function call 3 The F1 key can be used to request help from the system with respect to this module.
MESOMATIC 4.4.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen Data mapping on the Profibus: Byte 0 1 2 3 4 5 6 7 8 Description The 6 decimal digits of the complement representation, delivers a weight value of DK900 is interrupted, the transmitted. weight value are converted to a 32 bit 2’ together with the sign. If the DK900 ??????, or the serial connection to the maximum positive value (7FFFFFFFhex) is Byte 0 contains Bits 7..0 (LSB) of the actual value. Bits 15..8 of the actual value Bits 23..
MESOMATIC 4.4.2. Automation und Messtechnik GmbH D-71394 Kernen Bidirectional channel (identifier 0xFF) The bidirectional (acyclic) channel allows to transmit to and receive from the DK900 commands and/or data, via the Profibus.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen Telegram from Profibus Master to the DK900 (command, instruction): Byte 0 1 2..31 Description Control byte Bit 7 Toggle bit, after the start of the DK900 the toggle bit is = 0. Bit 6 0, no meaning Bit 5 0, no meaning Bits 4..
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen Telegram from the DK900 to the Profibus Master (response): Byte 0 1 2..31 Description Control byte Bit 7 Toggle bit Bit 6 1=ACK, 0=NAK Bit 5 1= · No valid response received via the internal serial interface; · or the command is not supported, e. g. "*X..." · otherwise 0. Bits 4..
MESOMATIC 4.4.3. Automation und Messtechnik GmbH D-71394 Kernen Shortened bidirectional channel (identifier 0xBF) This channel is recommended to be used only if problems occur when using the bidirectional 32 Byte channel with the identifier 0xFF, e. g. if it is impossible to ensure consistency over more than 16 Bytes on the SPC. The shortened 16 Byte channel (identifier 0xBF) corresponds to the 32 Byte channel (identifier 0xFF), but is limited to a length of 16 Bytes.
MESOMATIC 4.4.4. Automation und Messtechnik GmbH D-71394 Kernen Slave diagnosis The standard diagnosis reads "DK900_V1.0". If the DK900 Profibus controller is unable to get into contact with the DK900, or if the communication with the DK900 has been interrupted, a diagnosis with the EXT_DIAG Bit being set will be put out. Diagnosis via the Profibus: Byte 0 1..10 11 12 13 14 Description Number of the bytes of the diagnosis (0x0F hex) Text "DK900_V1.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen 5. Technical data power supply nom. 24 VDC ( 18 ... 30 VDC smoothed) current consumption without load cells < 30 mA at 24 VDC load cell supply voltage 10 VDC +- 0,1 % maximum current approx. 500 mA (maximum of 15 load cells of 350 W) int. resolution 24 Bit » 16 x 106 digits pract. available resolution approx. 19 Bit, » 500 000 digits conversion rate approx. 30 / sec.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen 6. Connecting plan DK 900/PDP X1 4 8 X1 1 5 3 6 4 7 14 X3 Interface RS232 3 RTS 6 CTS 2 TXD 5 RXD 1 Shield 4 GND X3 In / Outputs 7 IN 5: 6 IN 4: 5 IN 3: 4 IN 2: 3 IN 1: 2 IN 0: tare 1 +UB DIO 12-30V 8 1 X6 1 2 3 X5 Supply 1 +24V 2 GND 3 PE 4 PE X6 Profibus D-Sub 9pol.
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen 6 wire load cell electrical connection DMS X1-2 Supply +10V X1-3 Sense + X1-4 Signal + X1-8 Signal - X1-7 Sense - X1-6 Supply 0V X1-1 Shield 4 wire load cell electrical connection DMS X1-2 Supply +10V X1-3 Sense + X1-4 Signal + X1-8 X1-7 X1-6 X1-1 Signal Sense Supply 0V Shield Special version: measurement potentiometer X1-2 Supply +10V X1-3 Sense + X1-4 X1-8 Signal - X1-7 Sense - X1-6 Supply 0V X1-1 DK900 Signa
MESOMATIC Automation und Messtechnik GmbH D-71394 Kernen 7. Serial cable shield RxD 2 3 2 TxD TxD 3 2 5 RxD RTS 7 4 6 CTS CTS 8 5 3 RTS Gnd 5 7 4 Gnd DCD 1 8 DTR 4 20 DSR 6 6 RI 9 22 PC COM1/2 DK900 1 9 pol. Min.D. DK900 X2 25 pol. Min.D.
