HIMA F3 DIO 16/8 01, Manual, Page: 17 / 60

F3 DIO 16/8 01 3 Product Description
HI 800 177 E Rev. 2.00 Page 17 of 60
3.1.4 Line Diagnosis with Digital Outputs
The remote I/O is provided with a line diagnosis (short-circuits and open-circuits) for the digital
outputs. Line diagnosis of the digital outputs is only possible when used in a 2-pole
configuration.
The line diagnosis is activated using the
Line Monitoring [BOOL] ->
system parameter in
SILworX and the
DO[xx].LSLB Monitoring
system signal in ELOP II Factory.
The line diagnosis measures the impedance of the connected load.
The line diagnosis detects the following faults:
 Short-circuit between DO+ and external DO-
 Short-circuit between DO+ and external L+
 Short-circuit between DO+ and external L-
 Short-circuit between DO- and external L+
 Short-circuit between DO- and external L-
 Open-circuit between DO+ and DO-
The line diagnosis reports detected faults to the user program.
 In SILworX, with the system variables
-> + Error Code [WORD]
or
-> - Error Code [WORD]
.
 In ELOP II Factory, with the system signals
DO[xx].+Error Code
or
DO[xx].-Error Code
.
Line diagnosis is offered in two operating modes:
 Line diagnosis for lamp loads and inductive loads, and
 line diagnosis for ohmic, capacitive loads.
i
A relay or actuator connected to the output may accidentally be switched on!
A requirement for applications in machine safety is that the outputs DO+, DO- are switched off
if an open-circuit is detected.
i
If the requirements previously described cannot be met, observe the following case:
If a short-circuit occurs between DO- and L-, a relay may be energized or some other actuator
may be set to a different switching state.
Reason: During the monitoring time specified for line diagnosis, a 24 V level (DO+ output) is
present on the load (relay, switching actuator) allowing it to receive enough electrical power to
potentially switch to another state.
The monitoring time must be configured such that an actuator cannot be activated by the line
diagnosis test pulse.
With line diagnosis, set a test period and an adequate monitoring time.
3.1.4.1 Line Diagnosis for Lamp Loads and Inductive Loads
To detect short-circuits, the remote I/O sends a 24 V pulse to the output circuit for the duration
of 500 µs. After this time, it sends a 10 V pulse to detect open-circuits for the duration of the
monitoring time.
Refer to Chapter 4.5.1 for more information on the configuration.