Safety Manager Safety Manual - Tuv-fs.com

3 – Safety Manager fault detection and response
Analog input faults
Analog input faults
Related to
analog input value
loop power
(SAI-1620m)
Table 10 on page 28 provides an overview of faults that can be detected in
relation to analog inputs and the response to these faults.
Table 10 Controller response to analog input faults
Diagnostic message
reports
below low transmitter
alarm level per range
above high transmitter
alarm level all ranges
External voltage
monitoring fault
Non redundant input Redundant input, Controller response
Controller response * CP X (faulty input) CP Y (healthy input)
none- continue for
0-20mA, 0-10V
bottom scale for
4-20mA, 2-10V
none- continue
none- continue
none- continue for 0-20mA, 0-10V
bottom scale for 4-20mA, 2-10V
none- continue
none- continue
channel module faulty apply FR state use values from
CP **
Y
module module faulty apply FR state use values from
Internal power down
CP Y***
compare *** input compare error apply FR state apply FR state
none- continue
none- continue
* If the Controller is redundant, both CPs respond the same.
** If values are not available via CP Y apply FR state to affected inputs.
*** Occurs when detecting a deviation of >2% in the input values persists for more than 2 application cycles.
Digital output faults
Table 11 on page 28 provides an overview of faults that can be detected in
relation to digital outputs and the response to these faults.
Table 11 Controller response to digital output faults
Digital output faults
Related to
digital output loop **
(line monitored)
default voting
Diagnostic message
reports
Non redundant output
Controller response *
current detected Apply FR state apply FR state
Redundant output, Controller response
CP X (faulty output) CP Y (healthy output)
28 Release 131, Issue 4.2