HIMA F3 DIO 16/8 01, Manual, Page: 18 / 60

3 Product Description F3 DIO 16/8 01
Page 18 of 60 HI 800 177 E Rev. 2.00
3.1.4.2 Line Diagnosis for Ohmic, Capacitive Loads
To diagnose the line for ohmic and capacitive loads, the remote I/O sends a 10 V test pulse to
the output circuit for the duration of the monitoring time. This type of line diagnosis is particularly
recommended for ohmic and ohmic capacitive loads. With inductive loads or lamp loads, error
messages related to the short-circuit may be generated.
Refer to Chapter 4.5.2 for more information on the configuration.
3.1.4.3 Test Period and Monitoring Time
For line diagnosis, configure the test period and the monitoring time. These time parameters
influence all the channels configured for line diagnosis.
During the monitoring time, the status is read back in 1 ms intervals and, if no faults are
detected, the process values are rewritten to the output. The monitoring time can be set in
intervals of 1 ms between 0 and 50 ms (default value 0 ms).
i
The duration of the monitoring time is added to the cycle time. During the monitoring time, the
output circuit is supplied with a reduced voltage.
The time period can be configured in intervals of 1 s between 1 and 100 s. The interval depends
on following parameters:
 Number of test pulses allowed in the external circle.
 Monitoring time
If the time period is set to 1 s, a test pulse is sent in intervals of 250 ms for the duration of the
monitoring time.
Within one test period, 4 test pulses are generally pulsed in intervals of 0.25 x time period.
After the period time the line diagnosis is finished and the next line diagnosis cycle starts.