HIMatrix 6 Outputs
HI 800 023 E Rev. 1.01 Page 35 of 72
6.4.1 Test Routines for Two-Pole Digital Outputs
The devices are tested automatically during operation. The main test functions are:
Reading the output signals back from the switching amplifier. The switching threshold
for a read-back signal is 2 V. The diodes used prevent a feed back of signals.
Checking the integrated (redundant) safety shutdown.
A shutdown test of the outputs is carried out within the MOT for a maximum of 200 µs.
The minimum time between two tests is ≥ 20 seconds.
Line diagnosis with two-pole connection
F3 DIO 16/8 01:
- Short-circuit to L+, L-.
- Short-circuit between two-pole connections.
- Open-circuit in one of the two-pole lines.
Line diagnosis with two-pole connection
F3 DIO 8/8 01: Short-circuit to L+, L-..
Test of L- switch capability at two-pole connection with line diagnosis (F3 DIO 16/8 01).
Monitoring of the output current
The system monitors its operating voltage and de-energizes all outputs at a low voltage of
less than 13 V.
6.4.2 One-Pole/Two-Pole Connection (F3 DIO 8/8 01, F3 DIO 16/8 01):
The digital outputs can be configured as follows:
- Digital output with two-pole connection with line diagnosis
- Digital output with two-pole connection without line diagnosis
- Digital output with one-pole L+ switching DO+
- Digital output with one-pole L- switching DO+
Two-Pole Connection
NOTE
A relay or actuator connected to the output may accidentally be switched on!
With applications in accordance with EN 954-1 Cat. 4, the line diagnosis status signal
must be used to switch off the outputs (DO+, DO-), if a failure occurs.
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 voltage level (DO+
output) is present on the load (relay, switching actuator) allowing it to receive enough
electrical power to potentially switch to another state.
NOTE
Detection of open-circuits may be disturbed!
In a 2-pole connection, no DI input must be connected to a DO output. This would
inhibit the detection of open-circuits.
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