Siemens SIWAREX WT241 Manual page 5

11.1 Communication via Modbus ................................................................................................... 93
11.1.1 General information ................................................................................................................ 93
11.1.2 Principle of data transmission ................................................................................................. 93
11.1.3 Data record concept ................................................................................................................ 94
11.1.4 Command mailboxes .............................................................................................................. 95
11.1.5 Reading registers .................................................................................................................... 95
11.1.6 Writing registers ...................................................................................................................... 96
11.2 Parameters and functions ....................................................................................................... 97
11.3 DR 2 command code .............................................................................................................. 98
11.4 DR 3 Belt scale parameters .................................................................................................... 98
11.4.1 Scale name ........................................................................................................................... 101
11.4.2 Code for regulations.............................................................................................................. 101
11.4.3 Unit for belt load .................................................................................................................... 102
11.4.4 Unit for flow rate .................................................................................................................... 102
11.4.5 Resolution of weight and belt load ........................................................................................ 102
11.4.6 Resolution of flow rate .......................................................................................................... 103
11.4.7 Resolution of master totalizer ............................................................................................... 103
11.4.8 Design flow rate .................................................................................................................... 103
11.4.9 Weigh length ......................................................................................................................... 103
11.4.10 Belt length ............................................................................................................................. 104
11.4.11 Number of belt revolutions .................................................................................................... 104
11.4.12 Speed detection .................................................................................................................... 104
11.4.13 Design speed ........................................................................................................................ 104
11.4.14 Speed correction if belt loaded ............................................................................................. 104
11.4.15 Belt load factor for speed correction ..................................................................................... 105
11.4.16 Impulse constant speed sensor ............................................................................................ 105
11.4.17 Initial zero calibration digits ................................................................................................... 105
11.4.18 Calibration weight ................................................................................................................. 106
11.4.19 Calibration load ..................................................................................................................... 106
11.4.20 Calibration quantity ............................................................................................................... 106
11.4.21 Span calibration digits ........................................................................................................... 106
11.4.22 Simulation mode ................................................................................................................... 106
11.4.23 Warm-up timer ...................................................................................................................... 107
11.4.24 Interface for the legal trade display ....................................................................................... 107
11.4.25 Software version for HMI SecureDisplay with verification capability .................................... 107
11.4.26 Minimum display size in % of the HMI SecureDisplay with verification capability ................ 107
11.5 Calibration procedure............................................................................................................ 108
11.5.1 General information .............................................................................................................. 108
11.5.2 Calibration of the speed ........................................................................................................ 108
11.5.3 Specification of known speed parameters ............................................................................ 110
11.6 Calibration of weight measurement ...................................................................................... 111
11.6.1 Determination of zero point ................................................................................................... 111
11.6.2 Span calibration by weight .................................................................................................... 111
11.6.3 Automatic span calibration with load cell data ...................................................................... 112
11.6.4 Span calibration by test chain ............................................................................................... 113
11.6.5 Span calibration with known material flow ............................................................................ 113
11.7 DR 4 Temporary parameters ................................................................................................ 115
11.7.1 Stop watch ............................................................................................................................ 117
11.7.2 Result calculator ................................................................................................................... 117
SIWAREX WT241
Manual, 05/2015, A5E36046748A
Introduction
1.1 Purpose of the manual
5