Function blocks
56 Function blocks for TwinSAFE logic components
If Restart is disabled, the FB MON remains in the safe state if the EDM inputs do not have the signal state
"1".
An EDM error can therefore only be detected, when the manual restart is active.
EDM monitoring error
FB MON only reports an EDM error if manual restart is active. If manual restart is not active, the FB MON
remains in SAFE state if an EDM error is present.
The following inputs can be combined to pairs: MonIn1 / MonIn2, MonIn3 / MonIn4, Secure1 / Secure2).
The signal states of the two inputs may only deviate from each other within a configurable discrepancy
time. If this discrepancy time is exceeded for an input pair, the FB MON enters the error state (FB Error).
The error state can only be exited through acknowledgement via the ERR_ACK input of the associated
TwinSAFE group.
In the FB error state, the outputs assume the safe state "0", only the Error output is "1".
The characteristics for acknowledging a discrepancy error can be set via the checkbox Safe Inputs after
Disc Error. If the checkbox is set, both inputs of the input group that has caused the discrepancy error
have to return logical zero simultaneously before the error can be reset.
The safe state must have been requested at least once on each active MonIn input after starting the FB
MON if the manual function test is active, before an edge of the restart input reacts.
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