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7BCOMMUNICATION IN SIMATIC S7
8.4.7
CMD_ERR:= "DB_SIWA_U".bo_CMD_ERR, output, BOOL
The bit notifies the user for a cycle that his command has not been executed. The
bit is set for one cycle (edge) only. In the same cycle, the cause can be shown with
the variable CMD_ERR_C:= "DB_SIWA_U".b_CMD_ERR_CODE. The number is
itemized in the table "Data and operator errors" in Chapter
. When no error code
is specified, it must be checked in the same cycle in
"DB_SIWA_U".b_FB_ERR_CODE whether an FB error is present.
8.4.8
CMD_ERR_C:= "DB_SIWA_U".b_CMD_ERR_CODE, output, BYTE
For a command that is not executed (Finished with errors), the error number is
output here. The number that is output is decoded in table "Data and operator
errors" in chapter
. The value remains in the output until the next command is
triggered. The evaluation is to be performed when the set bit
CMD_ERR:= "DB_SIWA_U".bo_CMD_ERR appears. When no error code is
specified, it must be checked in the same cycle in
"DB_SIWA_U".b_FB_ERR_CODE whether an FB error is present.
8.4.9
REF_COUNT1:= "DB_SIWA_U".b_CYCLE_COUNT_CH1, output, BYTE
The current output values, which are prepared as output variables of the FB
SIWA_U, are read out from the FB cyclically via the peripheral area. SIWAREX U
updates the counter internally in a 20 ms rhythm. Each updating is given a serial
number, which can be used as a time stamp in the SIMATIC CPU. The number can
be between 0 and 255.
8.4.10 SC_STATUS1:= "DB_SIWA_U".b_SCALE_STATUS_CH1, output, BYTE
The current status of the scale is output via this variable. The meaning of the status
bits corresponds to the status byte in DR31.
8.4.11 ASYNC_ERR1:= "DB_SIWA_U".w_OPR_ERR_MSG_CH1, output, BYTE
Via this word the current operating errors (asynchronous errors) are displayed.
This error display is automatically reset with the correction of the error.
8.4.12 GROSS1:= "DB_SIWA_U".i_GROSS_WEIGHT_CH1, output, INT
Via this variable the user is provided with the current weight value for channel 1.
8.4.13 FLT_RAW1:= "DB_SIWA_U".w_ADC_VALUE_FILTERED_CH1, output, INT
Via this variable the user is provided with the current digital filtered value from the
ADC for channel 1.
8-54
SIWAREX U