3 Product Description
F3 DIO 16/8 01
Page 16 of 60
HI 800 177 E Rev. 2.00
3.1.3
Safety-Related Digital Outputs
The state (HIGH, LOW) of each output is signaled by an individual LED (HIGH, LOW). The
following block diagram shows how the 2-pole digital outputs are connected:
DO1+
L
+
S
+
DO1
-
W
D
L
-
S
-
W
D
&
&
DOn-
DOn+
Connection to I/O Bus
Current Limiting
Logic
2-Pole Output
Figure 5: Block Diagram for 2-pole Digital Outputs
The 1oo2 processor system directly energizes the digital outputs. Field zone and processor
zone are not galvanically separated. The operating voltage directly supplies the outputs.
If a critical failure occurs, the processor system brings the outputs to the de-energized state
directly, via the I/O bus or indirectly, using the watchdog (second independent shutdown
function).
If communication is lost, the output is set to the initial value configured. This effect must be
taken into account for the behavior of the connected output.
If an overload occurs, one or all digital outputs are switched off. If the overload is removed, the
outputs are switched on again automatically, see Table 14.
3.1.3.1
Reaction in the Event of a Fault
If the device detects a faulty signal on a digital output, the affected module output is set to the
safe (de-energized) state using the safety switches.
If a device fault occurs, all digital outputs are switched off.
In both cases, the devices activates the
FAULT
LED.
The error code allows the user to configure additional fault reactions in the user program.