KROHNE ALTOSONIC V Modbus EN - Manual (Page 2)

ALTOSONIC V
ModBus Manual 0300 rev07 E 7.30855.35.00 Page 2 of 64
TABLE OF CONTENTS
1 INTRODUCTION TO MODBUS.................................................................................................... 5
2 SERIAL TRANSMISSION FORMAT ............................................................................................ 6
2.1 ASCII- MODE ................................................................................................................................... 6
2.2 RTU- MODE ..................................................................................................................................... 6
3 MODBUS MESSAGE FRAMING.................................................................................................. 7
3.1 T HE A DDRESS F IELD ....................................................................................................................... 7
3.2 T HE F UNCTION F IELD ...................................................................................................................... 7
3.3 T HE D ATA F IELD .............................................................................................................................. 7
3.4 T HE E RROR C HECKING F IELD .......................................................................................................... 8
3.5 O THER E RROR C HECKING M ETHODS ............................................................................................... 8
4 PHYSICAL COMMUNICATION LAYER....................................................................................... 9
4.1 W HEN USING RS232 TO RS485 CONVERTERS ................................................................................. 9
4.2 W HEN USING SERIAL I/O CARDS WITH RS485 DRIVERS ..................................................................... 9
5 SUPPORTED FUNCTIONS ........................................................................................................ 10
5.1 F UNCTION 01: READ COIL STATUS ............................................................................................ 10
5.2 F UNCTION 02: READ INPUT STATUS.......................................................................................... 11
5.3 F UNCTION 03: READ MULTIPLE HOLDING REGISTERS ........................................................... 11
5.4 F UNCTION 04: READ INPUT REGISTERS ................................................................................... 12
5.5 F UNCTION 05: WRITE SINGLE COIL ........................................................................................... 12
5.6 F UNCTION 06: WRITE SINGLE HOLDING REGISTER ................................................................ 12
5.7 F UNCTION 8: DIAGNOSTICS........................................................................................................ 13
5.8 F UNCTION 15: WRITE MULTIPLE COILS .................................................................................... 13
5.9 F UNCTION 16: WRITE MULTIPLE HOLDING REGISTERS ......................................................... 14
5.10 E XCEPTION R ESPONSES ............................................................................................................ 15
6 HANDLING OF LARGE DATA TYPES ...................................................................................... 16
6.1 F LOATING P OINT R EPRESENTATION ............................................................................................... 17
6.2 D OUBLE R EPRESENTATION ............................................................................................................ 17
6.3 T RANSMIT S EQUENCE .................................................................................................................... 17
6.4 M AXIMUM REQUESTED POINTS ....................................................................................................... 18
7 SET-UP OF THE UFP-V MODBUS DRIVER ............................................................................. 20
7.1 D RIVER C ONTENTS ........................................................................................................................ 20
7.2 H ARDWARE SET - UP ....................................................................................................................... 20
7.2.1 RS485/422 card: AX4285A............................................................................................................ 21
7.2.2 RS485/422 card: PCL-745 S ......................................................................................................... 22
7.3 S OFTWARE SET - UP ....................................................................................................................... 23
7.3.1 First set the parameters for the communication line...................................................................... 23
7.3.2 Now select the parameters for the used protocol .......................................................................... 23
7.3.3 The UFP-V as SLAVE device ........................................................................................................ 23
7.3.4 The UFP-V as Master .................................................................................................................... 24
7.4 W HAT CAN GO WRONG ? ................................................................................................................ 25
7.5 H OW S TATUS F LAGS ARE U PDATED ............................................................................................... 25
7.6 H OW DATA IS WRITTEN TO THE FLOAT FIELD .................................................................................... 27
7.6.1 How to write in the float field to the specific application ................................................................ 27
8 MODBUS MAPPING ASSIGNMENTS ....................................................................................... 29
8.1 F IELD 0 (R EAD ONLY B OOLEAN FIELD ) ............................................................................................ 29
8.2 F IELD 1 (R EAD /W RITE B OOLEAN F IELD ) ......................................................................................... 31
8.3 F IELD 2 (R EAD ONLY I NTEGER F IELD ) ............................................................................................. 35
8.4 F IELD 3 (R EAD ONLY L ONG I NTEGER F IELD ).................................................................................... 38
8.5 F IELD 4 (R EAD ONLY F LOAT F IELD ) ................................................................................................ 40
8.6 F IELD 5 (R EAD ONLY D OUBLE F IELD ).............................................................................................. 45
8.7 F IELD 6 (R EAD /W RITE F LOAT F IELD ).............................................................................................. 46