User Manual
Appendix A
GFK-2843A
Jan 2020
VersaSafe system
82
A-6
Diagnostics
In addition to precise diagnostics for the standard bus system, the safe input and output
devices also support the detection of I/O errors and device errors.
A-6.1
Error detection in I/O devices
Safe inputs
Depending on the device type and parameterization, the following errors can be detected
at safe inputs:
•
Short circuit
•
Cross circuit
•
Overload/short circuit of the clock outputs
When an error is detected at an input, the safe state is set for this input and a “0”
is
transmitted in the input data of the input (“0” = safe state).
The corresponding error message is transmitted to the IC220SDL963 and the standard
control system.
Important
For more detailed information on error detection at the safe inputs, please refer to the
user manual for the IC220SDL543/IC220SDL544.
Safe outputs
Depending on the device type and parameterization, the following errors can be detected
at safe outputs:
•
Short circuit
•
Cross circuit
•
Overload
When an error is detected at an output, the affe
cted output is disabled (“0” = OFF = safe
state).
The corresponding error message is transmitted to the IC220SDL963 and the standard
control system.
Important
For more detailed information on error detection at the safe outputs, please refer to the
user manual for the IC220SDL752/IC220SDL753/IC220SDL840 modules.
A-6.2
Detection of device errors
All serious errors that can result in the loss of or adversely affect the safety function cause
the entire device to enter the safe state. The FS LED on the safe device is permanently on.
