ESD C.2071.01, Руководство по оборудованию

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Output_nominal
Output_actual
Err_out (Device)
Err_out (CAN)
Overcurrent
T
ON
(ca. 12 ms) T
OFF
= 64 x T
ON
error_hold_time
$
T
ON
User parameter
CAN-Control-I/O Software Rev. 1.1 3 - 5
3.2.3 Setting of the Error-Hold-Time (Parameter 3)
By means of parameter 3 the Error-Hold-Time is set for the common error message (
errstat
) for all
output groups together.
User parameter no. Default
(=sub command no.) setting
Parameter Value range
$03 $0000...$FFFF
error_hold_time
$0010
(16 ms)
Table 3.2.4: User parameter 3
The Error-Hold-Time is used for holding the error signal active. This is necessary, because the error
signal is set inactive together with the output signal by the automatically internal protection circuit of
the driver. The output is set active again automatically after a wait time T
, even if the reason for the
OFF
error is still present. This would cause an alternating error output signal.
The following figure shows a principle timing example:
Fig. 3.2.5: Timing example of the error signal
After the first error signal is activated, the Error-Hold-Time shall prevent the deactivation of the
following error signal for the duration of at least T . Therefore the value of
error_hold_time
ON
has always be set to values greater than T .
ON