X20(c)SC2212
18
Data sheet V1.141 X20(c)SC2212 Translation of the original documentation
8.2 Wiring errors
The wiring errors described in section "Error detection" are indicated by the red channel LED according to the
application.
If a module detects an error, then:
•
The channel LED is lit constantly red.
•
Status signal (e.g. (Safe)ChannelOK, (Safe)InputOK, (Safe)OutputOK, etc.) is set to (SAFE)FALSE.
•
Signal "SafeDigitalInputxx" or "SafeDigitalOutputxx" is set to SAFEFALSE.
•
An entry is generated in the logbook.
Danger!
Recognizable errors (see the following chapters) are detected by the module within the error detection
time. Errors not recognized by the module (or not recognized on time) that can lead to safety-critical
states must be detected using additional measures.
Danger!
It is your responsibility to ensure that all necessary repair measures are initiated after an error occurs
since subsequent errors can result in a hazard!
8.2.1 Type B output channels
Danger!
As illustrated in the following circuit examples, the connected actuators can be connected to GND on
the load side. Connecting actuators on just one side without a GND supply is not permitted, however.
This would cause a series connection of the actuators in the event of an open circuit, which could then
cause a hazardous module error.
GND
SO n +
GND
SO m +
GND
SO n +
GND
SO m +
Correct:
With external GND
Correct:
Without external GND
Incorrect
GND
SO n +
GND
SO m +
Figure 12: Invalid wiring