Warnings
Section 1 Safety Operator Warnings
18
2PAA110888-600 - Warnings based on 3BNP004865-600 RevA
I/O Module Settings
To ensure safe operation and adaptation to the process, AI880A High Integrity
Analog Input Module, shall be configured according to the directions in Table 12.
Safety Related Settings of AI880A.
It is the user's responsibility to handle warnings (related to under range, 0-4mA, see
Signal Range in Table 12. Safety Related Settings of AI880A) and errors from
IO.Status as well as errors related to the soft error indication (if Device Malfunction
Low (DML) < 1.6mA, see Figure 9) according to plant requirements.
To ensure safe operation and adaptation to the process, AI880A as DI - Loop
Supervised Digital Input Module shall be configured according to the directions in
Table 13. Safety Related Settings of AI880A as DI - Loop Supervised.
To ensure safe operation and adaptation to the process, DI880 shall be configured
according to the directions in Table 14. Safety Related Settings of DI880.
To ensure safe operation and adaptation to the process, DO880 shall be configured
according to the directions in Table 15. Safety Related Settings of DO880.
Configuration of DRT and FDRT
The Demand Response Time, DRT and Fault Detection and Reaction Time, FDRT
of a loop can be calculated using the figures in Table 16. Response times for safety
components.
When the FDRT
Controller
is required to be less than the configured
FDRT(Diag.Cycle.), the user must connect the channel error from the I/O within the
application code such that it affects a SIL3 output signal, i.e. in such a way that the
affected loop is brought to a safe state.
During Warm Download and Hot Insert of SM811 the calculated shorter
FDRT
Controller SIL3
is superseded by the configured FDRT (Diag.Cycle.). It is the
responsibility of the end user, via organizational measures, ensuring that this can be
done in a safe way.
Formulas for FDRT are only valid if Modulebus scan time is less than half the
Application Interval Time such that all I/Os are scanned before the application is
executed.
