5.7.4 DR 21/22 – cut-off weight limit value 2...........................................................................5-37
5.8 DR 31 PROCESS VALUES CHANNEL 1, DR 32 PROCESS VALUES CHANNEL 2.............................5-37
5.8.1 DR 31/32 – current weight ..............................................................................................5-38
5.8.2 DR 31/32 – scale status ...................................................................................................5-38
5.8.3 DR 31/32 – update counter..............................................................................................5-38
5.8.4 DR 30 – filtered digital value from the AD converter......................................................5-38
5.8.5 DR 31/32 – operating errors ...........................................................................................5-39
5.8.6 DR 31/32 – data and command errors ............................................................................5-39
5.9 DR 40 MODULE INFO ................................................................................................................5-39
6 Commands...........................................................................................................................6-41
6.1 COMMAND GROUPS ..................................................................................................................6-41
6.2 COMMAND LIST........................................................................................................................6-41
7 Messages and diagnostics.................................................................................................7-43
7.1 MESSAGE TYPES.......................................................................................................................7-43
7.2 MESSAGE PATHS.......................................................................................................................7-43
7.3 DETECTING MESSAGES WITH THE AID OF SIWATOOL U.........................................................7-44 U
7.4 DETECTING MESSAGES USING SIWA_U FB.............................................................................7-44
7.5 DETECTING MESSAGES WITH THE AID OF THE DIAGNOSTIC ALARMS IN THE SIMATIC CPU....7-44
7.5.1 Evaluating the diagnostic alarm with OB82....................................................................7-44
7.5.2 Diagnosis by means of the data set DS31/32...................................................................7-46
7.5.3 Diagnosis by means of the component status ..................................................................7-46
7.5.4 Diagnostic buffers on SIWAREX U .................................................................................7-47
7.6 PROCESS ALARMS.....................................................................................................................7-47
7.7 MESSAGE LIST OF DATA AND COMMAND ERRORS (SYNCHRONOUS MESSAGES) ........................7-48
7.8 MESSAGE LIST OF OPERATING MESSAGES (ASYNCHRONOUS ERRORS) ......................................7-48
7.9 MESSAGES VIA LEDS...............................................................................................................7-50
8 Communication in SIMATIC S7..........................................................................................8-51
8.1 GENERAL INFORMATION ..........................................................................................................8-51
8.2 SIWAREX U IN THE HW-CONFIGURATION .............................................................................8-51
8.3 SIWAREX U IN THE CYCLICAL STEP 7 PROGRAM ..................................................................8-52
8.4 CALL PARAMETERS OF THE FB SIWA_U.................................................................................8-53
8.4.1 ADDR:= 256, input, INT.................................................................................................8-53
8.4.2 DB_SCALE:= 9, input, INT.............................................................................................8-53
8.4.3 DB_VECTOR:= 8, input, INT .........................................................................................8-53
8.4.4 CMD_IN:= "DB_SIWA_U".i_CMD_INPUT, input, INT................................................8-53
8.4.5 CMD_INPR:= "DB_SIWA_U".bo_CMD_IN_PROGRESS, Output, BOOL ...................8-53
8.4.6 CMD_FOK:= "DB_SIWA_U".bo_CMD_FOK, output, BOOL.......................................8-53
8.4.7 CMD_ERR:= "DB_SIWA_U".bo_CMD_ERR, output, BOOL........................................8-54
8.4.8 CMD_ERR_C:= "DB_SIWA_U".b_CMD_ERR_CODE, output, BYTE..........................8-54
8.4.9 REF_COUNT1:= "DB_SIWA_U".b_CYCLE_COUNT_CH1, output, BYTE..................8-54
8.4.10 SC_STATUS1:= "DB_SIWA_U".b_SCALE_STATUS_CH1, output, BYTE....................8-54
8.4.11 ASYNC_ERR1:= "DB_SIWA_U".w_OPR_ERR_MSG_CH1, output, BYTE...................8-54
8.4.12 GROSS1:= "DB_SIWA_U".i_GROSS_WEIGHT_CH1, output, INT ..............................8-54
8.4.13 FLT_RAW1:= "DB_SIWA_U".w_ADC_VALUE_FILTERED_CH1, output, INT...........8-54
8.4.14 FB_ERR:= "DB_SIWA_U".bo_FB_ERR, output, BOOL................................................8-55
8.4.15 FB_ERR_C:= "DB_SIWA_U".b_FB_ERR_CODE.........................................................8-55
8.4.16 START_UP:= "DB_SIWA_U".bo_STARTING_UP.........................................................8-55
8.4.17 RESTART:= "DB_SIWA_U".bo_RESTART ....................................................................8-56
8.4.18 CMD_EN:= "DB_SIWA_U".bo_CMD_EN.....................................................................8-56
8.5 ALLOCATION OF THE SCALE DB...............................................................................................8-56
8.6 PROCESS ALARMS.....................................................................................................................8-56
8.7 PERIPHERAL AREA FOR SFC, SFB, FB COMMUNICATION .........................................................8-57
8.8 PERIPHERAL AREA FOR I/O COMMUNICATION ..........................................................................8-57
9 Communication with other systems .................................................................................9-58
9.1 HARDWARE AND SOFTWARE REQUIREMENTS ...........................................................................9-58
SIWAREX U vii
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